IBIC2014 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
MOCYB2	Design and Initial Commissioning of Beam Diagnostics for the KEK Compact ERL	linac, electron, optics, emittance	7
	R. Takai, T. Honda, T. Nogami, T. Obina, H. Sagehashi, Y. Tanimoto, M. Tobiyama KEK, Ibaraki, Japan
	A compact energy-recovery linac (cERL) was constructed at KEK as a test accelerator for the ERL-based light source. Standard beam monitors such as beam position monitors (BPMs), screen monitors (SCMs), and beam loss monitors (BLMs) have been developed for the cERL and used in its commissioning. For the main BPMs, we adopted the stripline type, the time response of which is improved by using a glass-sealed feedthrough. The SCMs are equipped with two types of screens and an RF shield for wake-field suppression. Optical fibers with photomultiplier tubes (PMTs), covering the entire cERL circumference, are used as the BLM. CsI scintillators with large-cathode PMTs are also prepared for detecting local beam loss. The design and some initial commissioning results of these standard monitors are described in this paper.
	Slides MOCYB2 [4.987 MB]
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MOCZB1	A Picosecond Sampling Electronic “KAPTURE” for Terahertz Synchrotron Radiation	synchrotron-radiation, synchrotron, storage-ring, detector	24
	C.M. Caselle, M. Brosi, S.A. Chilingaryan, T. Dritschler, N. Hiller, V. Judin, A. Kopmann, A.-S. Müller, L. Petzold, J. Raasch, L. Rota, M. Siegel, N.J. Smale, J.L. Steinmann, M. Vogelgesang, M. Weber, S. Wuensch KIT, Eggenstein-Leopoldshafen, Germany
	For a few years, coherent synchrotron radiation (CSR) generated by short electron bunches has been provided at the ANKA light source. Electron bunches can be filled in up to 184 buckets with a distance between two adjacent bunches of 2 ns corresponding to the RF system frequency of 500 MHz. Arbitrary filling patterns are generated to investigate the interaction of adjacent bunches in CSR. To study the THz emission characteristics over multiple revolutions superconducting YBa2Cu3O7−δ (YBCO) film detectors are used. The intrinsic response time of YBCO thin films is in the order of a few picoseconds only. For fast, continuous sampling of these individual ultra-short terahertz pulses, a novel digitizer system has been developed. The KAPTURE (KArlsruhe Pulse Taking Ultra-fast Readout Electronics) consists of a wideband low-noise amplifier, a picosecond pulse sampling card and a GByte transfer data link back-end readout card. High-end graphic processing units (GPUs) perform real-time data analysis. The KAPTURE system was successfully demonstrated for readout of the intensity fluctuations in the CSR at the ANKA Storage Ring detected in THz range. Four samples are recorded in parallel for each fast pulse with programmable sampling times in the range of 3 to 100 psec. A clean jitter phase locked loop (PLL) provides a clock signal with high temporal accuracy. The back-end card receives the 4 digital samples every 2 ns with 12 bits resolution and transmits the data to the data analysis unit. The readout board is based on programmable logic FPGA and DDR3 memories for on-line data preprocessing and temporary storage. The data is transmitted to the GPU computing node by a fast data transfer links based on a bus master DMA engine connected to PCI express endpoint logic to ensure a continuous high data throughput of up to 4 GByte/s. This heterogeneous real-time system architecture based on FPGA and GPU is used for on-line pulse reconstruction and evaluations and calculates the peak amplitude of each pulse and the time between consecutive bunches with a picosecond time resolution. A Fast Fourier Transform (FFT) is performed on-line for the frequency analysis of the CSR undulations. With the presented acquisition system it was possible to resolve the bursting behavior of single bunches even in a multi-bunch environment to study the bunch-bunch-interactions at ANKA. First results obtained have already been published in the synchrotron machine physic community. The monitoring of bursting for different ANKA parameters using KAPTURE system opens up new analysis and diagnostics possibilities for electron storage rings operating at short bunch lengths.
	Slides MOCZB1 [11.326 MB]
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MOPF14	Vertical Beam Size Measurement at CesrTA Using Diffraction Radiation	target, electron, background, polarization	77
	L.M. Bobb, T. Aumeyr, P. Karataev JAI, Egham, Surrey, United Kingdom T. Aumeyr, P. Karataev Royal Holloway, University of London, Surrey, United Kingdom M.G. Billing, J.V. Conway Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA L.M. Bobb DLS, Oxfordshire, United Kingdom E. Bravin, T. Lefèvre, S. Mazzoni, H. Schmickler CERN, Geneva, Switzerland
	Over recent years the first Diffraction Radiation (DR) beam size monitor has been tested on a circular machine. At CesrTA, Cornell University, USA, the sensitivity and limitations of the DR monitor for vertical beam size measurement has been investigated. DR emitted from 1 and 0.5 mm target apertures was observed at 400 and 600 nm wavelengths. In addition, interference between the DR signals emitted by the target and mask has been observed. In this report, we present the recent observations and discuss areas for improvement.
	Poster MOPF14 [3.379 MB]
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MOPF30	Diagnostics of the TPS Booster Synchrotron for Beam Commissioning	booster, synchrotron, injection, EPICS	114
	K.T. Hsu, J. Chen, Y.-S. Cheng, P.C. Chiu, S.Y. Hsu, K.H. Hu, C.H. Huang, C.H. Kuo, D. Lee, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Booster synchrotron for the Taiwan photon source project is in commissioning. Diagnostics which consist of screen monitors, intensity monitors, beam position monitors, tune monitors, visible light synchrotron radiation monitors and radiation-sensing field-effect transistors are integrated with accelerator control system. Integration and functionality check were done recently. Details of these diagnostics and preliminary test results will be summarized in this report.
	Poster MOPF30 [1.036 MB]
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MOPF31	Overview of Beam Instrumentation Activities for SwissFEL	electron, vacuum, undulator, pick-up	119
	R. Ischebeck, R. Abela, F. Ardana-Lamas, V.R. Arsov, R. Baldinger, H.-H. Braun, M. Calvi, R. Ditter, C. Erny, F. Frei, R. Ganter, I. Gorgisyan, C.P. Hauri, S. Hunziker, P.N. Juranic, B. Keil, W. Koprek, R. Kramert, D. Llorente Sancho, F. Löhl, F. Marcellini, G. Marinkovic, B. Monoszlai, G.L. Orlandi, C. Ozkan, L. Patthey, M. Pedrozzi, P. Pollet, M. Radovic, L. Rivkin, M. Roggli, M. Rohrer, V. Schlott, A.G. Stepanov, J. Stettler PSI, Villigen PSI, Switzerland F. Ardana-Lamas, I. Gorgisyan, C.P. Hauri, L. Rivkin EPFL, Lausanne, Switzerland P. Peier DESY, Hamburg, Germany
	SwissFEL will provide users with brilliant X-ray pulses in 2017. A comprehensive suite of diagnostics is needed for the initial commissioning, for changes to the operating point, and for feedbacks. The development of instrumentation for SwissFEL is well underway, and solutions have been identified for most diagnostics systems. I will present here an overview of the instrumentation for SwissFEL, and give details on some recent developments.
	Poster MOPF31 [4.418 MB]
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MOPD08	A Double-Prism Spectrometer for the Longitudinal Diagnosis of Femtosecond Electron Bunches with Mid-Infrared Transition Radiation	electron, detector, diagnostics, FEL	157
	S. Wunderlich, E. Hass, B. Schmidt, M. Yan DESY, Hamburg, Germany
	Funding: The project has been supported by the BMBF under contract 05K10GU2 & FS FLASH 301. Electron bunch lengths in the sub-10 fs regime and charges of a few tens of picocoulombs are parameters required for free-electron lasers [] and are also a consequence from the intrinsic process in laser-driven plasma wake field acceleration []. Since the coherent spectrum of transition radiation of these bunches carries the information on the longitudinal bunch profile in the form factor, the spectroscopy of transition radiation is an attractive method to determine the electron bunch length. A double-prism spectrometer has been developed and demonstrated for the single-stage measurement of mid-infrared transition radiation between 2 μm and 18 μm. The spectrometer facilitates single-shot spectral measurements with high signal-to-noise ratio utilising a line array of mercury cadmium telluride detectors. In this contribution, we present the spectrometer and measurements of electron bunches of the Free-Electron Laser in Hamburg (FLASH) at DESY. The results are compared to established bunch length monitors which are a multi-stage grating spectrometer for transition radiation and a transverse deflecting structure accessing the longitudinal phase space of the electron bunches directly. J. Rönsch-Schulenburg et al., Proceedings of FEL 2014, TUB04 (2014), to be published **O. Lundh et al., Nature Physics 7, 219–222 (2011)
	Poster MOPD08 [1.346 MB]
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MOPD15	CW Beam Stability Analysis in Time and Frequency Domain	electron, diagnostics, high-voltage, laser	179
	M. Kuntzsch, M. Gensch, B.W. Green, S. Kovalev, U. Lehnert, P. Michel, R. Schurig, J. Teichert HZDR, Dresden, Germany
	The superconducting quasi CW Linac ELBE has been characterized in terms of energy and timing stability. The measurement results presented show a combination of a laser-based bunch arrival-time measurements (BAM), a fast beam position monitor (BPM) readout with single bunch resolution and a compression monitor (BCM) based on a fast pyro-electric detector. By changing the bunch compression factor a separation and identification of jitter sources has been achieved. The quasi CW mode of operation enables frequency domain data analysis with high dynamic range, which gives a better understanding of the main sources of jitter. Experimental results for both injectors (thermionic DC, superconducting RF) are presented.
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MOPD24	Diagnostics of and with Laser-Induced Energy Modulation at the DELTA Storage Ring	laser, electron, undulator, storage-ring	202
	S. Khan, S. Hilbrich, H. Huck, M. Huck, M. Höner, C. Mai, A. Meyer auf der Heide, R. Molo, H. Rast, P. Ungelenk DELTA, Dortmund, Germany
	Funding: This work is supported by the BMBF (05K13PEC) and DFG (INST212/236-1) and by the Land NRW. DELTA is a 1.5-GeV electron storage ring operated by the Center for Synchrotron Radiation at the TU Dortmund University. An interaction between electron bunches and femtosecond laser pulses is routinely used to generate ultrashort pulses of coherent synchrotron radiation at harmonics of the laser wavelength (coherent harmonic generation, CHG) as well as short and coherent pulses in the THz regime. The paper describes diagnostics methods to optimize the laser-electron overlap and to characterize the generated VUV and THz pulses. Furthermore, the laser-electron interaction can be employed as a beam diagnostics tool, e.g. to study the longitudinal steady-state bunch profile as well as dynamic properties during RF-phase modulation, which is applied to improve the beam lifetime.
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TUIYB1	Diagnostics for High Power Accelerator Machine Protection Systems	monitoring, ion, neutron, hadron	239
	S.M. Lidia FRIB, East Lansing, Michigan, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University. Modern hadron accelerators create and transport beams that carry MW-scale power or store GJ-scale energy. The Machine Protection Systems (MPS) that guard against both catastrophic failures and long-term performance degradation must mitigate errant beam events on time scales as short as several microseconds. Measurement systems must also cope with detection over many orders of magnitude in beam intensity to adequately measure and respond beam halo loss. Other issues, such as radiated signal cross-talk, also confound and complicate delicate measurements. These requirements place enormous demands on the MPS beam diagnostics and beam loss monitors. We will review the current state of MPS diagnostic systems for this class of accelerator, including SNS, ESS, FRIB, LHC, J-PARC, and SPIRAL-II. Specific designs and key performance results will be presented and discussed.
	Slides TUIYB1 [7.425 MB]
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TUCYB1	Study of scintillation stability in KBr, YAG:Ce, CaF2:Eu and CsI:Tl Irradiated by Various-Energy Protons	ion, target, emittance, photon	250
	L.Y. Lin FRIB, East Lansing, Michigan, USA
	The luminescence of KBr, YAG:Ce, CaF2:Eu and CsI:Tl scintillators induced with H²⁺ ion beams in the energy range of 600-2150 keV/u has been systematically measured as a function of irradiation time. The measurements showed that the luminescence of CsI:Tl and YAG:Ce remained constant within the 1-hour continuous irradiation. An initial fast drop of the luminescence on CaF2:Eu was observed but the light output eventually approached a stable state under constant ion bombardment. We also observed that the light output of KBr initially increased and then degraded gradually with further irradiation. The CsI:Tl screen produced the highest scintillation yield and KBr the lowest.
	Slides TUCYB1 [2.078 MB]
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TUCYB3	SwissFEL Beam Profile Monitor	electron, vacuum, laser, detector	259
	R. Ischebeck, E. Prat, V. Schlott, V.G. Thominet PSI, Villigen PSI, Switzerland P. Krejcik, H. Loos SLAC, Menlo Park, California, USA M. Yan DESY, Hamburg, Germany
	We have developed a beam profile monitor that allows us to measure two-dimensional electron beam profiles for highly compressed electron bunches. Such bunches have plagued profile measurements in optical transition radiation monitors in the past, because coherent radiation entering the optical system has invalidated the images and even destroyed cameras. The present design makes use of a scintillating crystal, and directs coherent transition radiation away from the optical axis by careful choice of the angle. When observing Snell's law of refraction as well as the Scheimpflug imaging condition, a resolution better than the thickness of the scintillator can be achieved. We will present measurements performed at the SwissFEL Injector Test Facility and at the Linac Coherent Light Source. The high resolution and excellent sensitivity of this monitor make it ideal for installation in SwissFEL.
	Slides TUCYB3 [42.624 MB]
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TUIZB1	Radiation Sources and Their Application for Beam Profile Diagnostics	photon, diagnostics, electron, optics	263
	G. Kube DESY, Hamburg, Germany
	Radiation generated by high-energy particle beams is widely used for beam diagnostic purposes. Depending on the mechanism of radiation generation, the emitted wavelength range extends from the THz up to the X-ray region, thus allowing the measurement of beam profiles in the longitudinal and the transverse plane over a wide range. In this talk, basic considerations for radiation based profile measurements will be discussed with special emphasis on the mechanism of radiation generation and the impact on beam diagnostic measurements.
	Slides TUIZB1 [4.803 MB]
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TUCZB1	Novel Emittance Diagnostics for Diffraction Limited Light Sources Based on X-ray Fresnel Diffractometry	emittance, electron, diagnostics, betatron	274
	M. Masaki, Y. Shimosaki, S. Takano, M. Takao JASRI/SPring-8, Hyogo-ken, Japan
	A novel emittance diagnostics technique with high sensitivity using X-ray Fresnel diffraction by a single slit has been developed to measure micron-order electron beam sizes at insertion devices (IDs) of photon beamlines. The X-ray Fresnel diffractometry (XFD)* is promising for diagnostics especially of a so-called diffraction limited storage ring (DLSR) with ultra-low emittance. In the DLSR, due to inevitable field errors of strong quadrupole and sextupole magnets, unwanted distortion of lattice functions and local betatron coupling will result in a different light source size at each beamline. Therefore, measurements of electron beam sizes at the ID source points will be essential to ensure the absence of degradation of brilliance and transverse coherence of radiation at the beamlines. The XFD observes a double-lobed diffraction pattern that emerges by optimizing the single slit width. The principle is based on a correlation between the depth of a median dip in the double-lobed pattern and the light source size at the ID. The validity of the new technique was theoretically and experimentally studied. The achievable resolution of the XFD will be also discussed. * M. Masaki, et al.,"X-ray Fresnel Diffractometry for Ultra-Low Emittance Diagnostics of Next Generation Synchrotron Light Sources", submitted to Phys. Rev.ST-AB.
	Slides TUCZB1 [5.456 MB]
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TUCZB2	Measurements of Small Vertical Beamsize using a Coded Aperture at Diamond Light Source	electron, detector, synchrotron, synchrotron-radiation	279
	C. Bloomer, G. Rehm DLS, Oxfordshire, United Kingdom J.W. Flanagan KEK, Ibaraki, Japan
	Diamond Light Source produces a low emittance 3GeV electron beam which is now regularly operated at 8pm.rad vertical emittance. This corresponds to a vertical beamsize of just 13um in the dipole, which is at a high vertical beta location and routinely used for observing the synchrotron radiation using a pinhole camera. Deconvolution of the images from the pinhole camera to maximise resolution is limited by uncertainly regarding the precise shape of the pinhole, resulting in uncertainty on its computed point spread function. Recently a coded aperture has been installed which offers the potential to improve upon the traditional pinhole measurement by offering both higher resolution and increased flux seen through a larger total aperture, however, at the cost of significantly more complex analysis of the recorded images. A comparison of results obtained using the coded aperture and those achieved using the conventional pinhole is presented.
	Slides TUCZB2 [4.199 MB]
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TUPF13	Diamond-Based Photon BPMs for Fast Electron-Beam Diagnostics in Synchrotron Radiation Sources	electron, photon, diagnostics, detector	342
	M. Antonelli, G. Cautero, D. Giuressi, S. Lizzit, R.H. Menk Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy A. De Sio, E. Pace Università degli Studi di Firenze, Firenze, Italy M. Di Fraia Università degli Studi di Trieste, Trieste, Italy
	Electron-beam stability is amongst the primary concerns in current Synchrotron Radiation (SR) sources; in particular, in third-generation SR facilities high-brightness beamlines using undulator radiation are extremely sensitive to electron-beam oscillations. Orbit stabilization has been intensively addressed in the past years and many SR machines have been equipped with a Fast Orbit Feedback (FOFB) based on electron Beam-Position Monitors (eBPMs). On the other hand, photon Beam-Position Monitors (pBPMs), besides providing beamline users with crucial calibration data, are also a useful tool for keeping the electron beam under control, by monitoring position and intensity of the delivered radiation. The machine control system can take advantage of this information in order to improve the stability of the electron-beam. A diagnostic beamline, utilizing a couple of fast pBPMs based on single-crystal CVD diamond detectors, has been built and inserted into the central dead-end outlet of one of Elettra’s bending-magnets. Tests have been carried out both during normal machine operations and by deliberately moving the orbit during dedicated shifts. Owing to the outstanding properties of diamond in terms of speed and radiation hardness, the results show how the aforementioned system allows the beam position to be monitored with sub-micrometric precision at the demanding readout rates required by the FOFB. The radiation hardness of the sensors allows the operation over extended periods of time without special maintenance. Therefore, this system is particularly suited for storage-ring sections lacking in electron-beam monitoring and the tested diagnostic line represents a demonstrator for future implementation of pBPMs at several bending-magnet front ends of Elettra.
	Poster TUPF13 [3.409 MB]
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TUPF21	NSLS2 Visible Synchrotron Light Monitor Diagnostic Beamline Commissioning	synchrotron, storage-ring, dipole, injection	369
	W.X. Cheng, B. Bacha, Y. Hu, O. Singh, H. Xu BNL, Upton, Long Island, New York, USA
	Visible Synchrotron Light Monitor (SLM) beamline has been designed and constructed at NSLS2 storage ring, to characterize the electron beam profile at various machine conditions. Due to carefully alignment, SLM beamline was able to see the first light even before beam circulating the ring. Besides a normal CCD camera to monitor the beam profile, streak camera and gated camera are used to measure the longitudinal and transverse profile to understand the beam dynamics. Measurement results from these cameras will be present in this paper.
	Poster TUPF21 [1.631 MB]
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TUPF23	Beam Size Measurements using Synchrotron Radiation Interferometry at ALBA	extraction, synchrotron, synchrotron-radiation, vacuum	374
	L. Torino, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain T.M. Mitsuhashi KEK, Ibaraki, Japan
	First tests to measure the transverse beam size using interferometry at ALBA showed that the measurement reliability was limited by the inhomogeneous light wavefront arriving at the double slit system. For this reason, the optical components guiding the synchrotron radiation have been exchanged, and detailed quality checks have been carried out using techniques like the Fizeau interferometry or Hartmann mask tests. We report the results of the analysis of the optical elements installed in the beamline, and the beam size measurements performed using double slit interferometry in both horizontal and vertical planes.
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TUPF27	Optical System for ESS Target Protection	proton, target, FPGA, operation	389
	C.A. Thomas, M. Donna, T.J. Grandsaert, M. Göhran, R. Linander, T.J. Shea ESS, Lund, Sweden
	One specificity of the ESS accelerator and target is that a high power and ultra low emittance proton beam is sent straight onto a Tungsten target. The high power density proton beam from the ESS linac will damage any material it meets. Thus a strategy to protect the target and the target area has to be deployed: the proton beam on target will be defocused and swept, distributing homogeneously the power density on an area 10⁴ times larger than its non defocused area. On its way towards the target, the beam goes through two windows: the proton beam window (PBW) separating the high vacuum of the accelerator to the 1-bar He filled area of the target monolith; and the target window (TW) marking the entrance area of the target wheel. In this paper, we present the PBW imaging system, one of the proton beam diagnostics to be developed for imaging the proton beam current density deposited in the PBW. We will describe the expected performance of the imaging system in order to satisfy the PBW protection requirement. We will also describe the radiative processes which could be used as the source of the imaging system. Finally, we will describe the necessary condition and hardware for the implementation of a protection system for both the PBW and TW.
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TUPD03	Terahertz and Optical Measurement Apparatus for the Fermilab ASTA Injector	dipole, laser, optics, experiment	403
	R.M. Thurman-Keup, A.H. Lumpkin, J.C.T. Thangaraj Fermilab, Batavia, Illinois, USA
	ASTA is a facility at Fermilab that, once completed, will consist of a photoinjector with two superconducting capture cavities, at least one superconducting ILC-style cryomodule, and a small ring for studying non-linear, integrable beam optics. This paper discusses the layout for the optical transport system that will provide THz radiation to a Martin-Puplett interferometer for bunch length measurements as well as optical radiation to an externally located streak camera, also for bunch length measurements. It will be able to accept radiation from two synchrotron radiation ports in the bunch compressor, a diffraction/transition radiation screen downstream of the compressor, and a transition radiation screen after the spectrometer magnet for measurements of energy-time correlations.
	Poster TUPD03 [3.202 MB]
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TUPD06	CUPID: New System for Scintillating Screen Based Diagnostics	controls, GUI, operation, instrumentation	417
	B. Walasek-Höhne, C. Andre, A. Bräuning-Demian, H. Bräuning, R. Haseitl, T. Hoffmann, R. Lonsing, A. Reiter, C. Schmidt, M. Schwickert GSI, Darmstadt, Germany
	The Facility for Antiproton and Ion Research (FAIR) poses new challenges for standard beam instrumentation like precise beam imaging over a wide range of beam parameters, radiation hardness, etc. A new, fully FAIR-conformal system for standard scintillating screen based beam diagnostics was developed at GSI. To cover a wide range of foreseen applications, a new technical solution was required for the upcoming FAIR High Energy Beam Transport lines and Rings. The newly developed system including digital image acquisition, remote controllable optical system and mechanical design, was set up and commissioned with beam. CUPID (Control Unit for Profile and Image Data) is based on the CERN Front-End Software Architecture (FESA) to control beam diagnostic devices. The FESA class for the digital GigE camera (IDS uEye UI-5240SE-M, CMOS type) acquires the images and pre-processes the optical data as required by the geometry of the setup (rotation, stretching). The performance of the system reaches more than 15 frames per second with one connected client. If desired, the raw image data can be written to a file for offline analysis. Additionally, dedicated FESA classes access industrial Programmable Logic Controllers (PLCs) for a reliable slow control solution using the CERN IEPLC library. Camera control, timing, as well as power supply and reset options for up to eight digital cameras are realized by the in-house developed Camera Power Supply controller CPS8. We report on first results with the novel system during routine beam operation. In addition, we describe first operating experiences with new radiation-hard camera (Thermo Fischer Scientific, CCIR MegaRAD3) installed at the SIS18 extraction point with high radiation level.
	Poster TUPD06 [8.374 MB]
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TUPD08	YAG:Ce Screen Monitor Using a Gated CCD Camera	timing, emittance, synchrotron-radiation, collider	426
	T. Naito, T.M. Mitsuhashi KEK, Ibaraki, Japan
	Due to its good spatial resolution, the YAG:Ce screen monitor is often used for small beam profile measurement in the Linac and beam transport line. We constructed a high-resolution YAG:Ce screen monitor at KEK-ATF2 for the observation of small size beams a. We tested two types of screens, one is powder YAG:Ce and the other is single crystal YAG:Ce. Both screens have 50μm thickness. To escape from strong COTR, we applied delayed timing of the gate for the CCD camera. A microscope having a spatial resolution of 6μm was set outside of a vacuum chamber to observe the scintillation light from the YAG:Ce screen. The results of the difference between the two screens, the camera performance with delayed gate, and the optical performance of the microscope will be presented in this session.
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TUPD10	An Ultrafast Linear Array Detector for Single-Shot Electro-Optical Bunch Profile Measurements	detector, FPGA, synchrotron, laser	435
	L. Rota, C.M. Caselle, N. Hiller, A.-S. Müller, M. Weber KIT, Eggenstein-Leopoldshafen, Germany
	A new spectrometer system has been developed at ANKA for near-field single-shot Electro-Optical (EO) bunch profile measurements with a frame rate of 5 Mfps. The frame rate of commercial line detectors is limited to several tens of kHz, unsuitable for measuring fast dynamic changes of the bunch conditions. The new system aims to realize continuous data acquisition and over long observation periods without dead time. InGaAs or Si linear array pixel sensors are used to detect the near IR and visible spectrum radiation. The detector signals are fed via wire-bonding connections to the GOTTHARD ASIC, a charge-sensitive amplifier with analog outputs. The front-end board is also equipped with an array of fast ADCs. The digital samples are then acquired by an FPGA-based readout card and transmitted to an external DAQ system via a high-speed PCI-Express data link. The DAQ system uses high-end Graphics Processors Units (GPUs) to perform a real-time analysis of the beam conditions. In this paper we present the concept, the first prototype and the low-noise layout techniques used for fast linear detectors.
	Poster TUPD10 [5.159 MB]
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TUPD12	Development of Non-Invasive Electron Beam Position Monitor Based on Coherent Diffraction Radiation from a Slit	electron, target, detector, linac	442
	Y. Taira, R. Kuroda, M. Tanaka, H. Toyokawa AIST, Tsukuba, Ibaraki, Japan K. Sakaue Waseda University, Tokyo, Japan H. Tomizawa RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
	Funding: This work was supported by Grants-in-Aid for Scientific Research (26246046). Diffraction radiation (DR), which is closely related to transition radiation, is emitted when an electron passes near an edge or interface between two media with different dielectric constants. Theoretical and experimental investigation of DR is widely performing for a non-intercepting electron beam diagnostic. We have developed an electron bunch length and a beam position monitor using a coherent diffraction radiation (CDR), which is in the range of sub-millimeter wavelength. The frequency spectrum of CDR depends on a form factor expressed as the Fourier transform of the longitudinal particle distribution. We have measured the spatial intensity distribution of CDR emitted from the metallic edge with a terahertz camera. Total intensity passing through band pass filters (BPFs) was decreased as the transmission frequency of BPFs is increased up to 6 THz. The result indicates that the bunch length is few hundreds of femtosecond. A detailed data analysis is now performing. On the other hand, we have measured the intensity distribution of CDR emitted from the metallic rectangular slit. Bow-tie intensity distribution, aligned along the perpendicular direction to the slit edge, was measured with the terahertz camera. Moreover, when the electron beam did not pass through the center of the slit, an asymmetrical intensity distribution appeared. This asymmetry is due to the pre-wave zone effect. In short, we can found the beam position to the slit by measuring the asymmetry. In this conference, we will present the experimental results.
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TUPD16	Development of the Transverse Beam Profile Monitors for the PAL-XFEL	electron, diagnostics, vacuum, target	452
	I.Y. Kim, J.Y. Choi, H. Heo, H.-S. Kang, C. Kim, G. Mun, B.G. Oh, S.J. Park PAL, Pohang, Kyungbuk, Republic of Korea
	The PAL-XFEL is an X-ray free electron laser under construnction at the Pohang Accelerator Laboratory (PAL), Korea. In the PAL-XFEL, the electron beam can make coherent optical transition radiation (COTR) due to the microbunching instability in the compressed electron beam. In order to obtain transverse beam profiles without the COTR problem, we are developing scintillating screen monitors (with the geometric suppress method) and wire scanners. In this paper, we report test results at the test facility and progress in the development of the screen monitor and the wire scanner for the PAL-XFEL.
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TUPD23	Real-Time Display System for the Optical Fiber Beam Loss Monitor for the PHIL and ThomX Facilities	beam-losses, real-time, operation, vacuum	463
	I. Chaikovska, N. Delerue, A. Variola LAL, Orsay, France
	Fiber monitors are an attractive beam loss diagnostics tool. They are based on the detection of the electromagnetic shower produced by the main beam losses. Cherenkov radiation is produced by the electromagnetic shower charged particles within the multimode fibers attached to the vacuum chamber. It is consequently converted to an electrical signal containing the information about the position and intensity of the beam losses. Therefore, a system based on the fibers installed alongside the whole accelerator together with the signal detection system forms a continuous, real-time Fiber Beam Loss Monitor (FBLM). In this context, the FBLM is a very useful tool for the commissioning and beam alignment. In this article we report on the development of the real-time display system for the FBLM at PHIL (PHotoInjector at LAL, Orsay, France) as a prototype of the beam loss monitor for the ThomX project, the compact Compton based X-ray source under construction in Orsay
	Poster TUPD23 [11.431 MB]
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TUPD24	Installation of a Beam Loss Monitoring System at the S-DALINAC*	controls, EPICS, electron, monitoring	468
	L.E. Jürgensen, U. Bonnes, C. Burandt, M. Fischer, F. Hug, T. Kürzeder, N. Pietralla, R. Stegmann, M. Steinhorst TU Darmstadt, Darmstadt, Germany
	Funding: *Work supported by the BMBF through 05K13RDA The S-DALINAC is the superconducting linear accelerator of the Institut für Kernphysik at Technische Universität Darmstadt. It delivers an electron beam with energies up to 130 MeV. In order to get a short-time response about occurring beam losses and their locations a new system was tested and installed. The setup is based on beam loss monitors of Bergoz company using two pin-diodes to record primary electrons as well as secondary radiation in a coincidence set-up. The readout is done using a self-developed system of a supply unit including differential line-drivers and fast counting cards compatible to our EPICS-based control system. We will report on the installation of the whole system and its first commissioning as well as on the future use of the system for experiments on threshold currents for transverse beam break up.
	Poster TUPD24 [1.661 MB]
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TUPD25	Cryogenic Beam Loss Monitors for the Superconducting Magnets of the LHC	detector, cryogenics, dipole, proton	471
	M.R. Bartosik, B. Dehning, M. Sapinski CERN, Geneva, Switzerland V. Eremin, E. Verbitskaya IOFFE, St. Petersburg, Russia E. Griesmayer CIVIDEC Instrumentation, Wien, Austria C. Kurfuerst EBG MedAustron, Wr. Neustadt, Austria
	Funding: This research project has been supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Framework Programme (contract number: PITN-GA-2011-289485-OPAC). The Beam Loss Monitoring (BLM) detectors close to the interaction points (IP) of the Large Hadron Collider (LHC) are currently located outside the cryostat, far from the superconducting coils of the magnets. In addition to their sensitivity to lost beam particles, they also detect particles coming from the experimental collisions, which do not contribute significantly to the heat deposition in the superconducting coils. In the future, with beams of higher energy and brightness resulting in higher luminosity, distinguishing between these interaction products and dangerous quench-provoking beam losses from the primary proton beams will be challenging. The system can be optimised by locating beam loss monitors as close as possible to the superconducting coils, inside the cold mass of the magnets in superfluid helium at 1.9 K. The dose then measured by such Cryogenic Beam Loss Monitors (CryoBLMs) would more precisely correspond to the real dose deposited in the coil. The candidates under investigation for such detectors are based on silicon and diamond, several of which have now been installed inside the magnets in the LHC tunnel. This contribution will present the mechanical and electrical designs of these systems, as well as the results of their qualification testing.
	Poster TUPD25 [7.897 MB]
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WEPF26	The Brookhaven LINAC Isotope Production Facility (BLIP) Raster Scanning Upgrade	controls, target, laser, power-supply	608
	R.J. Michnoff, Z. Altinbas, P. Cerniglia, R. Connolly, C. Cullen, C. Degen, D.M. Gassner, R.L. Hulsart, R.F. Lambiase, L.F. Mausner, D. Raparia, P. Thieberger, M. Wilinski BNL, Upton, Long Island, New York, USA
	Brookhaven National Laboratory’s BLIP facility produces radioisotopes for the nuclear medicine community and industry, and performs research to develop new radioisotopes desired by nuclear medicine investigators. A raster scanning system is being installed to provide a better distribution of the H⁻ beam on the targets, allow higher beam intensities to be used, and ultimately increase production yield of the isotopes. The upgrade consists of horizontal and vertical dipole magnets sinusoidally driven at 5 kHz with 90 deg phase separation to produce a circular raster pattern, and a suite of new instrumentation devices to measure beam characteristics and allow adequate machine protection. The instrumentation systems include multi-wire profile monitors, a laser profile monitor, beam current transformers, and a beam position monitor. An overview of the upgrade and project status will be presented. Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
	Poster WEPF26 [2.002 MB]
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WEPD10	Front End Concept for a Wake Field Monitor	wakefield, detector, alignment, laser	660
	M.M. Dehler, S. Hunziker PSI, Villigen PSI, Switzerland M. Leich PSI, Villigen, Villigen, Switzerland
	Funding: EuCARD2 work package 12 Wake field monitors (WFMs) are used to directly measure the alignment between beam and RF accelerating structure via the transverse higher mode spectrum. As a sub task of the EuCARD2 project, we are developing a front end for the monitors of the multipurpose X band structure installed at the SwissFEL Injector Test facility SITF at PSI. We plan to use electro optical technology offering strong advantages in the robustness to interference and radiation, and in the ease of signal transport. We present the concept of the device, discuss the theoretical performance in terms of noise. For a proof of principle, we built a basic system, which we tested together with the existing monitors with beam at SITF.
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WEPD26	Bunch-by-Bunch Feedback Systems at the DELTA Storage Ring used for Beam Diagnostics	feedback, damping, storage-ring, laser	703
	M. Höner, S. Khan, M. Sommer DELTA, Dortmund, Germany
	Funding: Work supported by the BMBF. At the 1.5-GeV electron storage ring DELTA operated by the TU Dortmund University, a bunch-by-bunch feedback system was installed in 2011. Since then, it is in operation for different beam diagnostic purposes. A fast analysis of bunch-position data allows a real-time multibunch mode analysis during machine operation. In addition, the data analysis can be triggered by external events, e.g. beam losses or the injection process. In this paper, a feedback-based method to measure the damping times of multi-bunch modes is presented. Furthermore, a chromaticity-dependent single-bunch instability is analyzed. Finally, the use of the feedback system in the presence of an RF-phase modulation is presented.
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Paper

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MOCYB2

Design and Initial Commissioning of Beam Diagnostics for the KEK Compact ERL

linac, electron, optics, emittance

7

R. Takai, T. Honda, T. Nogami, T. Obina, H. Sagehashi, Y. Tanimoto, M. Tobiyama
KEK, Ibaraki, Japan

A compact energy-recovery linac (cERL) was constructed at KEK as a test accelerator for the ERL-based light source. Standard beam monitors such as beam position monitors (BPMs), screen monitors (SCMs), and beam loss monitors (BLMs) have been developed for the cERL and used in its commissioning. For the main BPMs, we adopted the stripline type, the time response of which is improved by using a glass-sealed feedthrough. The SCMs are equipped with two types of screens and an RF shield for wake-field suppression. Optical fibers with photomultiplier tubes (PMTs), covering the entire cERL circumference, are used as the BLM. CsI scintillators with large-cathode PMTs are also prepared for detecting local beam loss. The design and some initial commissioning results of these standard monitors are described in this paper.

Slides MOCYB2 [4.987 MB]

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MOCZB1

A Picosecond Sampling Electronic “KAPTURE” for Terahertz Synchrotron Radiation

synchrotron-radiation, synchrotron, storage-ring, detector

24

C.M. Caselle, M. Brosi, S.A. Chilingaryan, T. Dritschler, N. Hiller, V. Judin, A. Kopmann, A.-S. Müller, L. Petzold, J. Raasch, L. Rota, M. Siegel, N.J. Smale, J.L. Steinmann, M. Vogelgesang, M. Weber, S. Wuensch
KIT, Eggenstein-Leopoldshafen, Germany

For a few years, coherent synchrotron radiation (CSR) generated by short electron bunches has been provided at the ANKA light source. Electron bunches can be filled in up to 184 buckets with a distance between two adjacent bunches of 2 ns corresponding to the RF system frequency of 500 MHz. Arbitrary filling patterns are generated to investigate the interaction of adjacent bunches in CSR. To study the THz emission characteristics over multiple revolutions superconducting YBa2Cu3O7−δ (YBCO) film detectors are used. The intrinsic response time of YBCO thin films is in the order of a few picoseconds only. For fast, continuous sampling of these individual ultra-short terahertz pulses, a novel digitizer system has been developed. The KAPTURE (KArlsruhe Pulse Taking Ultra-fast Readout Electronics) consists of a wideband low-noise amplifier, a picosecond pulse sampling card and a GByte transfer data link back-end readout card. High-end graphic processing units (GPUs) perform real-time data analysis. The KAPTURE system was successfully demonstrated for readout of the intensity fluctuations in the CSR at the ANKA Storage Ring detected in THz range. Four samples are recorded in parallel for each fast pulse with programmable sampling times in the range of 3 to 100 psec. A clean jitter phase locked loop (PLL) provides a clock signal with high temporal accuracy. The back-end card receives the 4 digital samples every 2 ns with 12 bits resolution and transmits the data to the data analysis unit. The readout board is based on programmable logic FPGA and DDR3 memories for on-line data preprocessing and temporary storage. The data is transmitted to the GPU computing node by a fast data transfer links based on a bus master DMA engine connected to PCI express endpoint logic to ensure a continuous high data throughput of up to 4 GByte/s. This heterogeneous real-time system architecture based on FPGA and GPU is used for on-line pulse reconstruction and evaluations and calculates the peak amplitude of each pulse and the time between consecutive bunches with a picosecond time resolution. A Fast Fourier Transform (FFT) is performed on-line for the frequency analysis of the CSR undulations. With the presented acquisition system it was possible to resolve the bursting behavior of single bunches even in a multi-bunch environment to study the bunch-bunch-interactions at ANKA. First results obtained have already been published in the synchrotron machine physic community. The monitoring of bursting for different ANKA parameters using KAPTURE system opens up new analysis and diagnostics possibilities for electron storage rings operating at short bunch lengths.

Slides MOCZB1 [11.326 MB]

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MOPF14

Vertical Beam Size Measurement at CesrTA Using Diffraction Radiation

target, electron, background, polarization

77

L.M. Bobb, T. Aumeyr, P. Karataev
JAI, Egham, Surrey, United Kingdom
T. Aumeyr, P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom
M.G. Billing, J.V. Conway
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
L.M. Bobb
DLS, Oxfordshire, United Kingdom
E. Bravin, T. Lefèvre, S. Mazzoni, H. Schmickler
CERN, Geneva, Switzerland

Over recent years the first Diffraction Radiation (DR) beam size monitor has been tested on a circular machine. At CesrTA, Cornell University, USA, the sensitivity and limitations of the DR monitor for vertical beam size measurement has been investigated. DR emitted from 1 and 0.5 mm target apertures was observed at 400 and 600 nm wavelengths. In addition, interference between the DR signals emitted by the target and mask has been observed. In this report, we present the recent observations and discuss areas for improvement.

Poster MOPF14 [3.379 MB]

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MOPF30

Diagnostics of the TPS Booster Synchrotron for Beam Commissioning

booster, synchrotron, injection, EPICS

114

K.T. Hsu, J. Chen, Y.-S. Cheng, P.C. Chiu, S.Y. Hsu, K.H. Hu, C.H. Huang, C.H. Kuo, D. Lee, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Booster synchrotron for the Taiwan photon source project is in commissioning. Diagnostics which consist of screen monitors, intensity monitors, beam position monitors, tune monitors, visible light synchrotron radiation monitors and radiation-sensing field-effect transistors are integrated with accelerator control system. Integration and functionality check were done recently. Details of these diagnostics and preliminary test results will be summarized in this report.

Poster MOPF30 [1.036 MB]

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MOPF31

Overview of Beam Instrumentation Activities for SwissFEL

electron, vacuum, undulator, pick-up

119

R. Ischebeck, R. Abela, F. Ardana-Lamas, V.R. Arsov, R. Baldinger, H.-H. Braun, M. Calvi, R. Ditter, C. Erny, F. Frei, R. Ganter, I. Gorgisyan, C.P. Hauri, S. Hunziker, P.N. Juranic, B. Keil, W. Koprek, R. Kramert, D. Llorente Sancho, F. Löhl, F. Marcellini, G. Marinkovic, B. Monoszlai, G.L. Orlandi, C. Ozkan, L. Patthey, M. Pedrozzi, P. Pollet, M. Radovic, L. Rivkin, M. Roggli, M. Rohrer, V. Schlott, A.G. Stepanov, J. Stettler
PSI, Villigen PSI, Switzerland
F. Ardana-Lamas, I. Gorgisyan, C.P. Hauri, L. Rivkin
EPFL, Lausanne, Switzerland
P. Peier
DESY, Hamburg, Germany

SwissFEL will provide users with brilliant X-ray pulses in 2017. A comprehensive suite of diagnostics is needed for the initial commissioning, for changes to the operating point, and for feedbacks. The development of instrumentation for SwissFEL is well underway, and solutions have been identified for most diagnostics systems. I will present here an overview of the instrumentation for SwissFEL, and give details on some recent developments.

Poster MOPF31 [4.418 MB]

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MOPD08

A Double-Prism Spectrometer for the Longitudinal Diagnosis of Femtosecond Electron Bunches with Mid-Infrared Transition Radiation

electron, detector, diagnostics, FEL

157

S. Wunderlich, E. Hass, B. Schmidt, M. Yan
DESY, Hamburg, Germany

Funding: The project has been supported by the BMBF under contract 05K10GU2 & FS FLASH 301.
Electron bunch lengths in the sub-10 fs regime and charges of a few tens of picocoulombs are parameters required for free-electron lasers [*] and are also a consequence from the intrinsic process in laser-driven plasma wake field acceleration [**]. Since the coherent spectrum of transition radiation of these bunches carries the information on the longitudinal bunch profile in the form factor, the spectroscopy of transition radiation is an attractive method to determine the electron bunch length. A double-prism spectrometer has been developed and demonstrated for the single-stage measurement of mid-infrared transition radiation between 2 μm and 18 μm. The spectrometer facilitates single-shot spectral measurements with high signal-to-noise ratio utilising a line array of mercury cadmium telluride detectors. In this contribution, we present the spectrometer and measurements of electron bunches of the Free-Electron Laser in Hamburg (FLASH) at DESY. The results are compared to established bunch length monitors which are a multi-stage grating spectrometer for transition radiation and a transverse deflecting structure accessing the longitudinal phase space of the electron bunches directly.
*J. Rönsch-Schulenburg et al., Proceedings of FEL 2014, TUB04 (2014), to be published
**O. Lundh et al., Nature Physics 7, 219–222 (2011)

Poster MOPD08 [1.346 MB]

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MOPD15

CW Beam Stability Analysis in Time and Frequency Domain

electron, diagnostics, high-voltage, laser

179

M. Kuntzsch, M. Gensch, B.W. Green, S. Kovalev, U. Lehnert, P. Michel, R. Schurig, J. Teichert
HZDR, Dresden, Germany

The superconducting quasi CW Linac ELBE has been characterized in terms of energy and timing stability. The measurement results presented show a combination of a laser-based bunch arrival-time measurements (BAM), a fast beam position monitor (BPM) readout with single bunch resolution and a compression monitor (BCM) based on a fast pyro-electric detector. By changing the bunch compression factor a separation and identification of jitter sources has been achieved. The quasi CW mode of operation enables frequency domain data analysis with high dynamic range, which gives a better understanding of the main sources of jitter. Experimental results for both injectors (thermionic DC, superconducting RF) are presented.

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MOPD24

Diagnostics of and with Laser-Induced Energy Modulation at the DELTA Storage Ring

laser, electron, undulator, storage-ring

202

S. Khan, S. Hilbrich, H. Huck, M. Huck, M. Höner, C. Mai, A. Meyer auf der Heide, R. Molo, H. Rast, P. Ungelenk
DELTA, Dortmund, Germany

Funding: This work is supported by the BMBF (05K13PEC) and DFG (INST212/236-1) and by the Land NRW.
DELTA is a 1.5-GeV electron storage ring operated by the Center for Synchrotron Radiation at the TU Dortmund University. An interaction between electron bunches and femtosecond laser pulses is routinely used to generate ultrashort pulses of coherent synchrotron radiation at harmonics of the laser wavelength (coherent harmonic generation, CHG) as well as short and coherent pulses in the THz regime. The paper describes diagnostics methods to optimize the laser-electron overlap and to characterize the generated VUV and THz pulses. Furthermore, the laser-electron interaction can be employed as a beam diagnostics tool, e.g. to study the longitudinal steady-state bunch profile as well as dynamic properties during RF-phase modulation, which is applied to improve the beam lifetime.

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TUIYB1

Diagnostics for High Power Accelerator Machine Protection Systems

monitoring, ion, neutron, hadron

239

S.M. Lidia
FRIB, East Lansing, Michigan, USA

Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
Modern hadron accelerators create and transport beams that carry MW-scale power or store GJ-scale energy. The Machine Protection Systems (MPS) that guard against both catastrophic failures and long-term performance degradation must mitigate errant beam events on time scales as short as several microseconds. Measurement systems must also cope with detection over many orders of magnitude in beam intensity to adequately measure and respond beam halo loss. Other issues, such as radiated signal cross-talk, also confound and complicate delicate measurements. These requirements place enormous demands on the MPS beam diagnostics and beam loss monitors. We will review the current state of MPS diagnostic systems for this class of accelerator, including SNS, ESS, FRIB, LHC, J-PARC, and SPIRAL-II. Specific designs and key performance results will be presented and discussed.

Slides TUIYB1 [7.425 MB]

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TUCYB1

Study of scintillation stability in KBr, YAG:Ce, CaF2:Eu and CsI:Tl Irradiated by Various-Energy Protons

ion, target, emittance, photon

250

L.Y. Lin
FRIB, East Lansing, Michigan, USA

The luminescence of KBr, YAG:Ce, CaF2:Eu and CsI:Tl scintillators induced with H²⁺ ion beams in the energy range of 600-2150 keV/u has been systematically measured as a function of irradiation time. The measurements showed that the luminescence of CsI:Tl and YAG:Ce remained constant within the 1-hour continuous irradiation. An initial fast drop of the luminescence on CaF2:Eu was observed but the light output eventually approached a stable state under constant ion bombardment. We also observed that the light output of KBr initially increased and then degraded gradually with further irradiation. The CsI:Tl screen produced the highest scintillation yield and KBr the lowest.

Slides TUCYB1 [2.078 MB]

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TUCYB3

SwissFEL Beam Profile Monitor

electron, vacuum, laser, detector

259

R. Ischebeck, E. Prat, V. Schlott, V.G. Thominet
PSI, Villigen PSI, Switzerland
P. Krejcik, H. Loos
SLAC, Menlo Park, California, USA
M. Yan
DESY, Hamburg, Germany

We have developed a beam profile monitor that allows us to measure two-dimensional electron beam profiles for highly compressed electron bunches. Such bunches have plagued profile measurements in optical transition radiation monitors in the past, because coherent radiation entering the optical system has invalidated the images and even destroyed cameras. The present design makes use of a scintillating crystal, and directs coherent transition radiation away from the optical axis by careful choice of the angle. When observing Snell's law of refraction as well as the Scheimpflug imaging condition, a resolution better than the thickness of the scintillator can be achieved. We will present measurements performed at the SwissFEL Injector Test Facility and at the Linac Coherent Light Source. The high resolution and excellent sensitivity of this monitor make it ideal for installation in SwissFEL.

Slides TUCYB3 [42.624 MB]

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TUIZB1

Radiation Sources and Their Application for Beam Profile Diagnostics

photon, diagnostics, electron, optics

263

G. Kube
DESY, Hamburg, Germany

Radiation generated by high-energy particle beams is widely used for beam diagnostic purposes. Depending on the mechanism of radiation generation, the emitted wavelength range extends from the THz up to the X-ray region, thus allowing the measurement of beam profiles in the longitudinal and the transverse plane over a wide range. In this talk, basic considerations for radiation based profile measurements will be discussed with special emphasis on the mechanism of radiation generation and the impact on beam diagnostic measurements.

Slides TUIZB1 [4.803 MB]

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TUCZB1

Novel Emittance Diagnostics for Diffraction Limited Light Sources Based on X-ray Fresnel Diffractometry

emittance, electron, diagnostics, betatron

274

M. Masaki, Y. Shimosaki, S. Takano, M. Takao
JASRI/SPring-8, Hyogo-ken, Japan

A novel emittance diagnostics technique with high sensitivity using X-ray Fresnel diffraction by a single slit has been developed to measure micron-order electron beam sizes at insertion devices (IDs) of photon beamlines. The X-ray Fresnel diffractometry (XFD)* is promising for diagnostics especially of a so-called diffraction limited storage ring (DLSR) with ultra-low emittance. In the DLSR, due to inevitable field errors of strong quadrupole and sextupole magnets, unwanted distortion of lattice functions and local betatron coupling will result in a different light source size at each beamline. Therefore, measurements of electron beam sizes at the ID source points will be essential to ensure the absence of degradation of brilliance and transverse coherence of radiation at the beamlines. The XFD observes a double-lobed diffraction pattern that emerges by optimizing the single slit width. The principle is based on a correlation between the depth of a median dip in the double-lobed pattern and the light source size at the ID. The validity of the new technique was theoretically and experimentally studied. The achievable resolution of the XFD will be also discussed.
* M. Masaki, et al.,"X-ray Fresnel Diffractometry for Ultra-Low Emittance Diagnostics of Next Generation Synchrotron Light Sources", submitted to Phys. Rev.ST-AB.

Slides TUCZB1 [5.456 MB]

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TUCZB2

Measurements of Small Vertical Beamsize using a Coded Aperture at Diamond Light Source

electron, detector, synchrotron, synchrotron-radiation

279

C. Bloomer, G. Rehm
DLS, Oxfordshire, United Kingdom
J.W. Flanagan
KEK, Ibaraki, Japan

Diamond Light Source produces a low emittance 3GeV electron beam which is now regularly operated at 8pm.rad vertical emittance. This corresponds to a vertical beamsize of just 13um in the dipole, which is at a high vertical beta location and routinely used for observing the synchrotron radiation using a pinhole camera. Deconvolution of the images from the pinhole camera to maximise resolution is limited by uncertainly regarding the precise shape of the pinhole, resulting in uncertainty on its computed point spread function. Recently a coded aperture has been installed which offers the potential to improve upon the traditional pinhole measurement by offering both higher resolution and increased flux seen through a larger total aperture, however, at the cost of significantly more complex analysis of the recorded images. A comparison of results obtained using the coded aperture and those achieved using the conventional pinhole is presented.

Slides TUCZB2 [4.199 MB]

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TUPF13

Diamond-Based Photon BPMs for Fast Electron-Beam Diagnostics in Synchrotron Radiation Sources

electron, photon, diagnostics, detector

342

M. Antonelli, G. Cautero, D. Giuressi, S. Lizzit, R.H. Menk
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
A. De Sio, E. Pace
Università degli Studi di Firenze, Firenze, Italy
M. Di Fraia
Università degli Studi di Trieste, Trieste, Italy

Electron-beam stability is amongst the primary concerns in current Synchrotron Radiation (SR) sources; in particular, in third-generation SR facilities high-brightness beamlines using undulator radiation are extremely sensitive to electron-beam oscillations. Orbit stabilization has been intensively addressed in the past years and many SR machines have been equipped with a Fast Orbit Feedback (FOFB) based on electron Beam-Position Monitors (eBPMs). On the other hand, photon Beam-Position Monitors (pBPMs), besides providing beamline users with crucial calibration data, are also a useful tool for keeping the electron beam under control, by monitoring position and intensity of the delivered radiation. The machine control system can take advantage of this information in order to improve the stability of the electron-beam. A diagnostic beamline, utilizing a couple of fast pBPMs based on single-crystal CVD diamond detectors, has been built and inserted into the central dead-end outlet of one of Elettra’s bending-magnets. Tests have been carried out both during normal machine operations and by deliberately moving the orbit during dedicated shifts. Owing to the outstanding properties of diamond in terms of speed and radiation hardness, the results show how the aforementioned system allows the beam position to be monitored with sub-micrometric precision at the demanding readout rates required by the FOFB. The radiation hardness of the sensors allows the operation over extended periods of time without special maintenance. Therefore, this system is particularly suited for storage-ring sections lacking in electron-beam monitoring and the tested diagnostic line represents a demonstrator for future implementation of pBPMs at several bending-magnet front ends of Elettra.

Poster TUPF13 [3.409 MB]

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TUPF21

NSLS2 Visible Synchrotron Light Monitor Diagnostic Beamline Commissioning

synchrotron, storage-ring, dipole, injection

369

W.X. Cheng, B. Bacha, Y. Hu, O. Singh, H. Xu
BNL, Upton, Long Island, New York, USA

Visible Synchrotron Light Monitor (SLM) beamline has been designed and constructed at NSLS2 storage ring, to characterize the electron beam profile at various machine conditions. Due to carefully alignment, SLM beamline was able to see the first light even before beam circulating the ring. Besides a normal CCD camera to monitor the beam profile, streak camera and gated camera are used to measure the longitudinal and transverse profile to understand the beam dynamics. Measurement results from these cameras will be present in this paper.

Poster TUPF21 [1.631 MB]

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TUPF23

Beam Size Measurements using Synchrotron Radiation Interferometry at ALBA

extraction, synchrotron, synchrotron-radiation, vacuum

374

L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
T.M. Mitsuhashi
KEK, Ibaraki, Japan

First tests to measure the transverse beam size using interferometry at ALBA showed that the measurement reliability was limited by the inhomogeneous light wavefront arriving at the double slit system. For this reason, the optical components guiding the synchrotron radiation have been exchanged, and detailed quality checks have been carried out using techniques like the Fizeau interferometry or Hartmann mask tests. We report the results of the analysis of the optical elements installed in the beamline, and the beam size measurements performed using double slit interferometry in both horizontal and vertical planes.

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TUPF27

Optical System for ESS Target Protection

proton, target, FPGA, operation

389

C.A. Thomas, M. Donna, T.J. Grandsaert, M. Göhran, R. Linander, T.J. Shea
ESS, Lund, Sweden

One specificity of the ESS accelerator and target is that a high power and ultra low emittance proton beam is sent straight onto a Tungsten target. The high power density proton beam from the ESS linac will damage any material it meets. Thus a strategy to protect the target and the target area has to be deployed: the proton beam on target will be defocused and swept, distributing homogeneously the power density on an area 10⁴ times larger than its non defocused area. On its way towards the target, the beam goes through two windows: the proton beam window (PBW) separating the high vacuum of the accelerator to the 1-bar He filled area of the target monolith; and the target window (TW) marking the entrance area of the target wheel. In this paper, we present the PBW imaging system, one of the proton beam diagnostics to be developed for imaging the proton beam current density deposited in the PBW. We will describe the expected performance of the imaging system in order to satisfy the PBW protection requirement. We will also describe the radiative processes which could be used as the source of the imaging system. Finally, we will describe the necessary condition and hardware for the implementation of a protection system for both the PBW and TW.

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TUPD03

Terahertz and Optical Measurement Apparatus for the Fermilab ASTA Injector

dipole, laser, optics, experiment

403

R.M. Thurman-Keup, A.H. Lumpkin, J.C.T. Thangaraj
Fermilab, Batavia, Illinois, USA

ASTA is a facility at Fermilab that, once completed, will consist of a photoinjector with two superconducting capture cavities, at least one superconducting ILC-style cryomodule, and a small ring for studying non-linear, integrable beam optics. This paper discusses the layout for the optical transport system that will provide THz radiation to a Martin-Puplett interferometer for bunch length measurements as well as optical radiation to an externally located streak camera, also for bunch length measurements. It will be able to accept radiation from two synchrotron radiation ports in the bunch compressor, a diffraction/transition radiation screen downstream of the compressor, and a transition radiation screen after the spectrometer magnet for measurements of energy-time correlations.

Poster TUPD03 [3.202 MB]

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TUPD06

CUPID: New System for Scintillating Screen Based Diagnostics

controls, GUI, operation, instrumentation

417

B. Walasek-Höhne, C. Andre, A. Bräuning-Demian, H. Bräuning, R. Haseitl, T. Hoffmann, R. Lonsing, A. Reiter, C. Schmidt, M. Schwickert
GSI, Darmstadt, Germany

The Facility for Antiproton and Ion Research (FAIR) poses new challenges for standard beam instrumentation like precise beam imaging over a wide range of beam parameters, radiation hardness, etc. A new, fully FAIR-conformal system for standard scintillating screen based beam diagnostics was developed at GSI. To cover a wide range of foreseen applications, a new technical solution was required for the upcoming FAIR High Energy Beam Transport lines and Rings. The newly developed system including digital image acquisition, remote controllable optical system and mechanical design, was set up and commissioned with beam. CUPID (Control Unit for Profile and Image Data) is based on the CERN Front-End Software Architecture (FESA) to control beam diagnostic devices. The FESA class for the digital GigE camera (IDS uEye UI-5240SE-M, CMOS type) acquires the images and pre-processes the optical data as required by the geometry of the setup (rotation, stretching). The performance of the system reaches more than 15 frames per second with one connected client. If desired, the raw image data can be written to a file for offline analysis. Additionally, dedicated FESA classes access industrial Programmable Logic Controllers (PLCs) for a reliable slow control solution using the CERN IEPLC library. Camera control, timing, as well as power supply and reset options for up to eight digital cameras are realized by the in-house developed Camera Power Supply controller CPS8. We report on first results with the novel system during routine beam operation. In addition, we describe first operating experiences with new radiation-hard camera (Thermo Fischer Scientific, CCIR MegaRAD3) installed at the SIS18 extraction point with high radiation level.

Poster TUPD06 [8.374 MB]

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TUPD08

YAG:Ce Screen Monitor Using a Gated CCD Camera

timing, emittance, synchrotron-radiation, collider

426

T. Naito, T.M. Mitsuhashi
KEK, Ibaraki, Japan

Due to its good spatial resolution, the YAG:Ce screen monitor is often used for small beam profile measurement in the Linac and beam transport line. We constructed a high-resolution YAG:Ce screen monitor at KEK-ATF2 for the observation of small size beams a. We tested two types of screens, one is powder YAG:Ce and the other is single crystal YAG:Ce. Both screens have 50μm thickness. To escape from strong COTR, we applied delayed timing of the gate for the CCD camera. A microscope having a spatial resolution of 6μm was set outside of a vacuum chamber to observe the scintillation light from the YAG:Ce screen. The results of the difference between the two screens, the camera performance with delayed gate, and the optical performance of the microscope will be presented in this session.

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TUPD10

An Ultrafast Linear Array Detector for Single-Shot Electro-Optical Bunch Profile Measurements

detector, FPGA, synchrotron, laser

435

L. Rota, C.M. Caselle, N. Hiller, A.-S. Müller, M. Weber
KIT, Eggenstein-Leopoldshafen, Germany

A new spectrometer system has been developed at ANKA for near-field single-shot Electro-Optical (EO) bunch profile measurements with a frame rate of 5 Mfps. The frame rate of commercial line detectors is limited to several tens of kHz, unsuitable for measuring fast dynamic changes of the bunch conditions. The new system aims to realize continuous data acquisition and over long observation periods without dead time. InGaAs or Si linear array pixel sensors are used to detect the near IR and visible spectrum radiation. The detector signals are fed via wire-bonding connections to the GOTTHARD ASIC, a charge-sensitive amplifier with analog outputs. The front-end board is also equipped with an array of fast ADCs. The digital samples are then acquired by an FPGA-based readout card and transmitted to an external DAQ system via a high-speed PCI-Express data link. The DAQ system uses high-end Graphics Processors Units (GPUs) to perform a real-time analysis of the beam conditions. In this paper we present the concept, the first prototype and the low-noise layout techniques used for fast linear detectors.

Poster TUPD10 [5.159 MB]

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TUPD12

Development of Non-Invasive Electron Beam Position Monitor Based on Coherent Diffraction Radiation from a Slit

electron, target, detector, linac

442

Y. Taira, R. Kuroda, M. Tanaka, H. Toyokawa
AIST, Tsukuba, Ibaraki, Japan
K. Sakaue
Waseda University, Tokyo, Japan
H. Tomizawa
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan

Funding: This work was supported by Grants-in-Aid for Scientific Research (26246046).
Diffraction radiation (DR), which is closely related to transition radiation, is emitted when an electron passes near an edge or interface between two media with different dielectric constants. Theoretical and experimental investigation of DR is widely performing for a non-intercepting electron beam diagnostic. We have developed an electron bunch length and a beam position monitor using a coherent diffraction radiation (CDR), which is in the range of sub-millimeter wavelength. The frequency spectrum of CDR depends on a form factor expressed as the Fourier transform of the longitudinal particle distribution. We have measured the spatial intensity distribution of CDR emitted from the metallic edge with a terahertz camera. Total intensity passing through band pass filters (BPFs) was decreased as the transmission frequency of BPFs is increased up to 6 THz. The result indicates that the bunch length is few hundreds of femtosecond. A detailed data analysis is now performing. On the other hand, we have measured the intensity distribution of CDR emitted from the metallic rectangular slit. Bow-tie intensity distribution, aligned along the perpendicular direction to the slit edge, was measured with the terahertz camera. Moreover, when the electron beam did not pass through the center of the slit, an asymmetrical intensity distribution appeared. This asymmetry is due to the pre-wave zone effect. In short, we can found the beam position to the slit by measuring the asymmetry. In this conference, we will present the experimental results.

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TUPD16

Development of the Transverse Beam Profile Monitors for the PAL-XFEL

electron, diagnostics, vacuum, target

452

I.Y. Kim, J.Y. Choi, H. Heo, H.-S. Kang, C. Kim, G. Mun, B.G. Oh, S.J. Park
PAL, Pohang, Kyungbuk, Republic of Korea

The PAL-XFEL is an X-ray free electron laser under construnction at the Pohang Accelerator Laboratory (PAL), Korea. In the PAL-XFEL, the electron beam can make coherent optical transition radiation (COTR) due to the microbunching instability in the compressed electron beam. In order to obtain transverse beam profiles without the COTR problem, we are developing scintillating screen monitors (with the geometric suppress method) and wire scanners. In this paper, we report test results at the test facility and progress in the development of the screen monitor and the wire scanner for the PAL-XFEL.

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TUPD23

Real-Time Display System for the Optical Fiber Beam Loss Monitor for the PHIL and ThomX Facilities

beam-losses, real-time, operation, vacuum

463

I. Chaikovska, N. Delerue, A. Variola
LAL, Orsay, France

Fiber monitors are an attractive beam loss diagnostics tool. They are based on the detection of the electromagnetic shower produced by the main beam losses. Cherenkov radiation is produced by the electromagnetic shower charged particles within the multimode fibers attached to the vacuum chamber. It is consequently converted to an electrical signal containing the information about the position and intensity of the beam losses. Therefore, a system based on the fibers installed alongside the whole accelerator together with the signal detection system forms a continuous, real-time Fiber Beam Loss Monitor (FBLM). In this context, the FBLM is a very useful tool for the commissioning and beam alignment. In this article we report on the development of the real-time display system for the FBLM at PHIL (PHotoInjector at LAL, Orsay, France) as a prototype of the beam loss monitor for the ThomX project, the compact Compton based X-ray source under construction in Orsay

Poster TUPD23 [11.431 MB]

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TUPD24

Installation of a Beam Loss Monitoring System at the S-DALINAC*

controls, EPICS, electron, monitoring

468

L.E. Jürgensen, U. Bonnes, C. Burandt, M. Fischer, F. Hug, T. Kürzeder, N. Pietralla, R. Stegmann, M. Steinhorst
TU Darmstadt, Darmstadt, Germany

Funding: *Work supported by the BMBF through 05K13RDA
The S-DALINAC is the superconducting linear accelerator of the Institut für Kernphysik at Technische Universität Darmstadt. It delivers an electron beam with energies up to 130 MeV. In order to get a short-time response about occurring beam losses and their locations a new system was tested and installed. The setup is based on beam loss monitors of Bergoz company using two pin-diodes to record primary electrons as well as secondary radiation in a coincidence set-up. The readout is done using a self-developed system of a supply unit including differential line-drivers and fast counting cards compatible to our EPICS-based control system. We will report on the installation of the whole system and its first commissioning as well as on the future use of the system for experiments on threshold currents for transverse beam break up.

Poster TUPD24 [1.661 MB]

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TUPD25

Cryogenic Beam Loss Monitors for the Superconducting Magnets of the LHC

detector, cryogenics, dipole, proton

471

M.R. Bartosik, B. Dehning, M. Sapinski
CERN, Geneva, Switzerland
V. Eremin, E. Verbitskaya
IOFFE, St. Petersburg, Russia
E. Griesmayer
CIVIDEC Instrumentation, Wien, Austria
C. Kurfuerst
EBG MedAustron, Wr. Neustadt, Austria

Funding: This research project has been supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Framework Programme (contract number: PITN-GA-2011-289485-OPAC).
The Beam Loss Monitoring (BLM) detectors close to the interaction points (IP) of the Large Hadron Collider (LHC) are currently located outside the cryostat, far from the superconducting coils of the magnets. In addition to their sensitivity to lost beam particles, they also detect particles coming from the experimental collisions, which do not contribute significantly to the heat deposition in the superconducting coils. In the future, with beams of higher energy and brightness resulting in higher luminosity, distinguishing between these interaction products and dangerous quench-provoking beam losses from the primary proton beams will be challenging. The system can be optimised by locating beam loss monitors as close as possible to the superconducting coils, inside the cold mass of the magnets in superfluid helium at 1.9 K. The dose then measured by such Cryogenic Beam Loss Monitors (CryoBLMs) would more precisely correspond to the real dose deposited in the coil. The candidates under investigation for such detectors are based on silicon and diamond, several of which have now been installed inside the magnets in the LHC tunnel. This contribution will present the mechanical and electrical designs of these systems, as well as the results of their qualification testing.

Poster TUPD25 [7.897 MB]

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WEPF26

The Brookhaven LINAC Isotope Production Facility (BLIP) Raster Scanning Upgrade

controls, target, laser, power-supply

608

R.J. Michnoff, Z. Altinbas, P. Cerniglia, R. Connolly, C. Cullen, C. Degen, D.M. Gassner, R.L. Hulsart, R.F. Lambiase, L.F. Mausner, D. Raparia, P. Thieberger, M. Wilinski
BNL, Upton, Long Island, New York, USA

Brookhaven National Laboratory’s BLIP facility produces radioisotopes for the nuclear medicine community and industry, and performs research to develop new radioisotopes desired by nuclear medicine investigators. A raster scanning system is being installed to provide a better distribution of the H⁻ beam on the targets, allow higher beam intensities to be used, and ultimately increase production yield of the isotopes. The upgrade consists of horizontal and vertical dipole magnets sinusoidally driven at 5 kHz with 90 deg phase separation to produce a circular raster pattern, and a suite of new instrumentation devices to measure beam characteristics and allow adequate machine protection. The instrumentation systems include multi-wire profile monitors, a laser profile monitor, beam current transformers, and a beam position monitor. An overview of the upgrade and project status will be presented.
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy

Poster WEPF26 [2.002 MB]

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WEPD10

Front End Concept for a Wake Field Monitor

wakefield, detector, alignment, laser

660

M.M. Dehler, S. Hunziker
PSI, Villigen PSI, Switzerland
M. Leich
PSI, Villigen, Villigen, Switzerland

Funding: EuCARD2 work package 12
Wake field monitors (WFMs) are used to directly measure the alignment between beam and RF accelerating structure via the transverse higher mode spectrum. As a sub task of the EuCARD2 project, we are developing a front end for the monitors of the multipurpose X band structure installed at the SwissFEL Injector Test facility SITF at PSI. We plan to use electro optical technology offering strong advantages in the robustness to interference and radiation, and in the ease of signal transport. We present the concept of the device, discuss the theoretical performance in terms of noise. For a proof of principle, we built a basic system, which we tested together with the existing monitors with beam at SITF.

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WEPD26

Bunch-by-Bunch Feedback Systems at the DELTA Storage Ring used for Beam Diagnostics

feedback, damping, storage-ring, laser

703

M. Höner, S. Khan, M. Sommer
DELTA, Dortmund, Germany

Funding: Work supported by the BMBF.
At the 1.5-GeV electron storage ring DELTA operated by the TU Dortmund University, a bunch-by-bunch feedback system was installed in 2011. Since then, it is in operation for different beam diagnostic purposes. A fast analysis of bunch-position data allows a real-time multibunch mode analysis during machine operation. In addition, the data analysis can be triggered by external events, e.g. beam losses or the injection process. In this paper, a feedback-based method to measure the damping times of multi-bunch modes is presented. Furthermore, a chromaticity-dependent single-bunch instability is analyzed. Finally, the use of the feedback system in the presence of an RF-phase modulation is presented.

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