IBIC2012 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
MOCB01	Beam Instrumentation for the SuperKEKB Rings	detector, feedback, kicker, damping	6
	H. Fukuma, A. Arinaga, J.W. Flanagan, H. Ikeda, H. Ishii, S. Kanaeda, K. Mori, M. Tejima, M. Tobiyama KEK, Ibaraki, Japan G. Bonvicini, H. Farhat, R.S. Gillard Wayne State University, USA G.S. Varner University of Hawaii, Honolulu, HI, USA
	The electron-positron collider KEKB B-factory is currently being upgraded to SuperKEKB. The design luminosity of 8 x 10³⁵ /cm²/s will be achieved using beams with low emittance of several nm and doubling beam currents to 2.6 A in the electron ring (HER) and 3.6 A in the positron ring (LER). A beam position monitor (BPM) system of HER and LER will be equipped with super-heterodyne detectors, turn by turn log ratio detectors with fast gates to measure optics parameters during collision operation and detectors of BPMs near the collision point (IP) for orbit feedback to maintain stable collision. New X-ray beam profile monitors based on the coded aperture method will be installed aiming at bunch by bunch measurement of the beam profile. A large angle beamstrahlung monitor detecting polarization of the synchrotron radiation generated by beam-beam interaction will be installed near IP to obtain information about the beam-beam geometry. The bunch by bunch feedback system will be upgraded using low noise frontend electronics and new 12 bits iGp digital filters. An overview of beam instrumentation of SuperKEKB rings will be given in this paper.
	Slides MOCB01 [8.073 MB]

MOCC01	UV/X-ray Diffraction Radiation for Non-intercepting Micron-scale Beam Size Measurement	target, experiment, electron, background	24
	L.M. Bobb, N. Chritin, T. Lefèvre CERN, Geneva, Switzerland M.G. Billing CLASSE, Ithaca, New York, USA L.M. Bobb, V. Karataev JAI, Egham, Surrey, United Kingdom
	Diffraction Radiation (DR) is produced when a relativistic charged particle moves in the vicinity of a medium. The electric field of the charged particle polarizes the target atoms which then oscillate, emitting radiation with a very broad spectrum. The spatial-spectral properties of DR are sensitive to a range of electron beam parameters. Furthermore, the energy loss due to DR is so small that the electron beam parameters are unchanged. Therefore DR can be used to develop non-invasive diagnostic tools. The aim of this project is to measure the transverse (vertical) beam size using incoherent DR. To achieve the micron-scale resolution required by CLIC, DR in the UV and X-ray spectral-range must be investigated. During the next few years, experimental validation of such a scheme will be conducted on the CesrTA at Cornell University, USA. Here we present the current status of the experiment preparation.
	Slides MOCC01 [3.064 MB]

MOCC04	Improvement of Screen Monitor with Suppression of Coherent-OTR Effect for SACLA	electron, target, emittance, operation	34
	S. Matsubara, Y. Otake RIKEN/SPring-8, Hyogo, Japan S.I. Inoue SES, Hyogo-pref., Japan H. Maesaka RIKEN Spring-8 Harima, Hyogo, Japan
	The construction of SACLA (SPring-8 Angstrom Compact free electron LAser) was already completed and it is under operation. A screen monitor (SCM) system has been developed and was installed in order to obtain a direct image of a transverse beam profile with a spatial resolution of about 10 um, which is required to investigate electron-beam properties, such as a beam emittance. The SCM originally has a stainless steel target as a OTR radiator or a Ce:YAG crystal as a scintillation target. At the beginning of the SACLA operation, strong coherent OTR (COTR), which made an incorrect beam profile, was observed after bunch compressors. In order to suppress the COTR on the SCM, the stainless steel target was replaced to the Ce:YAG scintillation target. Since the COTR was still generated from the Ce:YAG target, a spatial mask was employed. The mask was mounted on the center of the optical line of the SCM, because the COTR light is emitted forward within ~1/γ radian, while the scintillation light has not angular dependence. Clear beam profiles with a diameter of a few tens of micro-meter are observed by means of the SCMs with this simple improvement.
	Slides MOCC04 [1.618 MB]

MOIC02	Electron Beam Diagnostic System for the Japanese XFEL, SACLA	undulator, electron, emittance, cavity	38
	H. Maesaka, H. Ego, C. Kondo, T. Ohshima, Y. Otake, H. Tomizawa RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan S. Matsubara, T. Matsumoto, K. Yanagida JASRI/SPring-8, Hyogo, Japan
	An x-ray free-electron laser (XFEL) based on self-amplified spontaneous emission (SASE) requires a highly brilliant electron beam. The Japanese XFEL facility, SACLA, requires a normalized emittance less than 1 mm mrad and a peak current more than 3 kA. To achieve this high peak current, 1 A beam with 1 ns duration from a thermionic electron gun is compressed down to 30 fs by means of a multi-stage bunch compressor system. Therefore, the beam diagnostic system for SACLA was designed for the measurements of the emittance and bunch length at each compression stage. We developed a high-resolution transverse profile monitor and a temporal bunch structure measurement system with a C-band rf deflector cavity etc. In addition, precise overlapping between an electron beam and radiated x-rays in the undulator section is necessary to ensure the XFEL interaction. Therefore, we employed a C-band sub-micron resolution RF-BPM to fulfill the demanded accuracy of 4 um. The beam diagnostic system surely contributed to the first x-ray lasing at a wavelength of 1.2 Angstrom. We present a design strategy of the whole beam diagnostic system and the achieved performance for each monitor.
	Slides MOIC02 [7.861 MB]

MOPA06	VIMOS, New Capabilities for an Optical Safety System	target, proton, diagnostics, software	57
	K. Thomsen, J. Devlaminck PSI, Villigen PSI, Switzerland
	VIMOS is a dedicated safety system developed at the Spallation Neutron Source SINQ at the Paul Scherrer Institut, PSI, in Switzerland. VIMOS very directly monitors the correct current density distribution of the proton beam on the target by sampling the light emitted from a glowing mesh heated by the passing protons. The design has been optimized for obtaining maximum sensitivity and timely detection of beam irregularities relying on standard well-proven components. Recently it has been demonstrated that technical boundary conditions like radiation level and signal strength should allow for upgrading the system to a sensitive diagnostic device delivering quantitative and image-resolved values for the proton current density distribution on the SINQ target. By determining the temperature of the glowing mesh from the signals in two separate wavelength bands the temperature distribution over the mesh can be derived und subsequently the incident proton beam current density distribution. Work aimed at investigating the feasibility of adding these diagnostic abilities to VIMOS shows initial promising results. The status of the project and preliminary findings will be reported.

MOPA09	Comparison of Three Different Concepts of High Dynamic Range and Dependability Optimised Current Measurement Digitisers for Beam Loss Systems	monitoring, status, detector, operation	66
	W. Viganò, B. Dehning, E. Effinger, G.G. Venturini, C. Zamantzas CERN, Geneva, Switzerland
	The first concept is based on current to frequency conversion, enhanced with an ADC for extending the dynamic range and decreasing the response time. A summary of 3 years worth of operational experience with such a system for LHC beam loss monitoring will be given. The second principle is based on an adaptive current to frequency converter implemented in an ASIC. The basic parameters of the circuit are discussed and compared with measurements. Several measures are taken to harden both circuits against single event effects and to make them tolerant for operation in radioactive environments. The third circuit is based on a fully differential integrator for enhanced dynamic range, where laboratory and test installation measurements will be presented. All circuits are designed to avoid any dead time in the acquisition and have reliability and fail safe operational considerations taken into account.

MOPA12	Characterization of a Wide Dynamic-range, Radiation-tolerant Charge-digitizer ASIC for Monitoring of Beam Losses	operation, detector, FPGA, monitoring	74
	G.G. Venturini, F. Anghinolfi, B. Dehning CERN, Geneva, Switzerland M. Kayal EPFL, Lausanne, Switzerland
	An Application Specific Integrated Circuit (ASIC) has been designed and fabricated to provide a compact solution to digitize current signals from ionization chambers and diamond detectors, employed as beam loss monitors at CERN and several other high energy physics facilities. The circuit topology has been devised to accept positive and negative currents, to have a wide dynamic range (above 120 dB), withstand radiation levels over 100kGy and offer different modes of operation, covering a broad range of applications. Furthermore, an internal conversion reference is employed in the digitization, to provide an accurate absolute measurement. This paper discusses the detailed characterization of the first prototype: linearity, radiation tolerance and temperature dependence of the conversion, as well as implications and system-level considerations regarding its use for beam instrumentation applications in a high energy physics facility.

MOPA33	Image Profile Diagnostics Solution for the Taiwan Photon Source	synchrotron, booster, synchrotron-radiation, EPICS	125
	C.Y. Liao, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, D. Lee, C.Y. Wu NSRRC, Hsinchu, Taiwan
	TPS (Taiwan Photo Source) is a third generation 3 GeV synchrotron light facility, featuring ultra-high photon brightness with extremely low emittance which will be a state-of-the-art synchrotron radiation facility and is being in construction at National Synchrotron Radiation Research Center (NSRRC) campus. Beam image profile and its analysis play an important role in beam diagnostics of a particle accelerator system. However, due to the CCD image collection devices are distributed around the linac, booster, and storage ring, a distributed EPICS system based image profile diagnostics solution was proposed, which are based on GigE Vision camera with PoE support. This solution provides an easy way for cabling, and delivery adequate performance. Implementation plan for the TPS and results of prototype test at existed facility to examine functionality of hardware and software will be summarized in this report.

MOPA42	Measurements of Martin-Puplett Interferometer Limitations using Blackbody Source	detector, FEL, vacuum, experiment	153
	P.E. Evtushenko, J.M. Klopf JLAB, Newport News, Virginia, USA
	Frequency domain measurements with Martin-Puplett interferometer is one of a few techniques capable of bunch length measurements at the level of ~ 100 fs. As the bunch length becomes shorter, it is important to know and be able to measure the limitations of the instrument in terms of shortest measurable bunch length. In this paper we describe experiment of using blackbody source with the modified Matrin-Puplett interferometer that is routinely used for bunch length measurements at the JLab FEL, as a way to estimate the shortest, measurable with the device, bunch. The limitation comes from high frequency cut-off of the presently used wire-grid polarizer and is estimated to be 50 fs RMS. The measurements are made with the same Golay cell detector that is used for beam measurements. We demonstrate that, even though the blackbody source is many orders of magnitude less bright than the coherent transition or synchrotron radiation, it can be used for the measurements and gives a very good signal to noise ratio in a combination with lock-in detection. We also compare the measurements made in air and in vacuum to show the very strong effect of the atmospheric absorption.

MOPB53	Hartmann Screen and Wavefront Sensor System for Extracting Mirror at SSRF	synchrotron, synchrotron-radiation, optics, extraction	191
	J. Chen, Y.B. Leng, K.R. Ye SINAP, Shanghai, People's Republic of China
	A Be mirror was used to extract visible synchrotron radiation light from bending magnet at SSRF. The surface of mirror was deformed because of X-ray heat. A set of Hartmann Screen Test was used to measure the surface of the mirror. Another equipment named The Shack-Hartmann wavefront sensor system was introduced to get more precision data. The result of two kind of test match each other well.

MOPB65	Measurement of Sub-picosecond Bunch Length with the Interferometry from Double Diffraction Radiation Target	electron, target, detector, simulation	218
	G.A. Naumenko, A. Potylitsyn, M.V. Shevelev, D.A. Shkitov TPU, Tomsk, Russia H.X. Deng, S.L. Lu, T. Yu, J.B. Zhang SINAP, Shanghai, People's Republic of China
	Funding: This work was supported by the joint Russian-Chinese grant (RFBR N 110291177 and NSFC N 11111120065) and partially by the Program of Russian MES 'Nauka' and Chinese NSFC grant N 11175240. Reliable and precise methods for non-invasive diagnostics of sub-picosecond electron bunches are required for new accelerator facilities (FEL, LWFA, et al.). Measurements of spectral characteristics of coherent radiation generated by such bunches using interferometer allow to determine a bunch length [1]. The interference pattern obtained by two diffraction radiation (DR) beams from two shifted plates (double DR target) may be used instead an interferometer [2]. Recently the coherent DR interferometry scheme at the SINAP accelerator facility was established [3]. Here we report the results of comparing the first measurement from such a technique with the measurement from Michelson interferometer. The parameters of fs linac are described in [4]. The DR target was consisted of two plates made from aluminum foil. The pyroelectric detector SPI-D-62 was used. The analysis of results from two techniques gives the same estimated bunch length about 660 fs (0.2 mm), which confirms the ability of the proposed technique for non-invasive bunch length measurements in the sub-picosecond range without a complicated scheme like Michelson interferometer or similar. 1. Murokh A.et al.,NIMA 410(1998)452 2. Potylitsyn A.P.,NIMB 227(2005)191 3. Shevelev M. et al.,Journal of Physics: Conference Series 357(2012) 4. Lin X.et al., Chin. Phys. Lett.27,4(2010)044101

MOPB67	Development of Offner Relay Optical System for OTR Monitor at 3-50 Beam Transport Line of J-PARC	target, proton, optics, beam-transport	222
	M. Tejima, T.M. Mitsuhashi KEK, Ibaraki, Japan Y. Hashimoto, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan S. Otsu Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
	An extremely wide aperture relay optical system based on Offner system has been designed and constracted for OTR monitor at 3-50 beam transport line of J-PARC. Diagnostics for beam profile and halo are very important to optimize injection beam from RCS to MR in J-PARC. For this purpose, an OTR monitor is planed to install for an observation of image of the beam and halo after the beam collimators. Since opening of OTR is very wide due to small Gamma; 3.2, extremely wide aperture (500mrad) optics will necessary to extract OTR from file target. We designed Offner type relay optics for the effective extraction of OTR having F=0.83. The clear aperture will cover 100 x 100mm aria on the target screen. Results of optical testing and design of OTR monitor will present in this paper.

MOPB68	Development of Profile Monitor System for High Intense Spallation Neutron Source	target, neutron, proton, remote-handling	227
	S.I. Meigo, A. Akutsu, M. Futakawa, K. Ikezaki, M. Ooi, S. Sakamoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	At the JSNS in J-PARC, a mercury target is employed as the neutron production target. It is well known that the damage on the mercury target is promotional to the 4th power of the peak current density of the primary proton beam on the target. For the high intense neutron source, the profile on the target is important to drive the neutron source with the continuously observation of the profile. We have developed to Multi Wire Profile Monitor System (MWPM). During beam operation, when the abnormally of the beam is found, the beam is cut out by the Machine Protection System (MPS). For the measurement of the two dimension observation on the target, we have developed the system based on the residual radiation measurement by using an imaging plate (IP), It is found that the both result by the MWPM and IP shows good agreement.

MOPB70	The Synchrotron Radiation Diagnostic Line at SSRF	emittance, synchrotron, synchrotron-radiation, feedback	232
	J. Chen, Z.C. Chen, G.Q. Huang, Y.B. Leng, K.R. Ye, W.M. Zhou SINAP, Shanghai, People's Republic of China
	The synchrotron radiation photon beam line has been operated since 2009 at Shanghai Synchrotron Radiation Facility. There are two diagnostic beam lines of the storage ring behind bending magnet, which is employed conventional X-ray and visible imaging techniques. A synchrotron radiation (SR) interferometer using visible light region in order to measure the small transverse electron beam size (about 22μm); low emittance and a low coupling. A small off-axis mirror is set for the convenience of the observation. Wave front testing is used for interferometer to calibrate the deformation effect of optical components. An X-ray pin-hole camera is also employed in the diagnostics beamline of the ring to characterize beam. Typically the point spread function of the X-ray pinhole camera is calculated via analytical or numerical method. Those two methods check each other. As a result, the measurement with SR system has quite enough resolution of itself even though the absolute beam size acquired. The existed system suffers with dynamic problem for beam physics studies. It has been measured 2.8nm.rad in small emittance mode at SSRF.

MOPB76	Evaluation of a Fluorescent Screen with a CCD System for Quality Assurance in Heavy-Ion Beam Scanning Irradiation System	ion, heavy-ion, controls, background	249
	Y. Hara, T. Furukawa, T. Inaniwa, K. Mizushima, K. Noda, S. Sato, T. Shirai, E. Takeshita NIRS, Chiba-shi, Japan
	The precise heavy-ion therapy such as the scanning irradiation system necessitates the precise quality assurance (QA) procedures to verify the performance of therapeutic scanned ion beams. To evaluate the uniformity of the 2D field, radiographic film is used due to its high spatial resolution and suit for the measurements of the integral dose. However, this technique is time consuming. Thus, we developed the QA tool with high spatial resolution to verify accuracy of the lateral size, position and uniformity of scanned ion beams in clinical application at the HIMAC, which we called the QA-SCN. The QA-SCN consists of a fluorescent screen, a CCD camera, a mirror, camera controllers and a dark box to protect against surrounding light. In this paper, to evaluate the performance of the QA-SCN, we compared the results obtained by using it with the measurements by radiographic film performed in the same experimental conditions. Also, we verified several types of corrections about errors, e.g. background, vignetting, to distort the measurement results. As a result, we confirmed that the QA-SCN can be used as the system for QA procedures of therapeutic scanned ion beams.

MOPB81	Residual Gas Ionization Profile Monitors in J-PARC Slow-extraction Beam Line	electron, proton, extraction, vacuum	267
	Y. Sato, A. Agari, E. Hirose, M. Ieiri, Y. Katoh, M. Minakawa, R. Muto, M. Naruki, S. Sawada, Y. Shirakabe, Y. Suzuki, H. Takahashi, M. Takasaki, K.H. Tanaka, A. Toyoda, H. Watanabe, Y. Yamanoi KEK, Tsukuba, Japan H. Noumi RCNP, Osaka, Japan
	Residual gas ionization profile monitors (RGIPMs) working in 1 Pa pressure have been developed for high-intensity proton beam (maximum: 50GeV-15uA) at J-PARC slow-extraction beam line. The transverse beam profiles are measured by collecting electrons produced by ionization of 1 Pa residual gas. The electrons are guided to the segmented electrode with a uniform electrostatic field applied in the gap. A uniform magnetic field is applied parallel to the electric field to reduce diffusion of electrons travelling to the electrodes. Typical spatial resolution of the RGIPMs with a 10 cm gap, a 10 V/cm electrostatic field, and a 400 gauss magnetic field at center is 0.5 mm. The collected charge is integrated during every extraction period (typically 2 second in 6 second accelerator cycle). Subtracting background distributions measured during off-beam period, profile distributions are measured clearly. The 14 RGIPMs installed in the slow-extraction beam line are working stably for the 30 GeV-0.46 uA proton beam at current maximum. In this contribution, detailed specifications and performance of the present RGIPMs will be reported.

MOPB88	Beam Size Monitor for TPS	photon, electron, synchrotron, synchrotron-radiation	291
	C.K. Kuan, S.Y. Perng, I.C. Sheng, T.C. Tseng NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	The third-generation light source TPS is under construction in NSRRC. There are two diagnostic beamlines in the storage ring. Visible SR interferometers and X-ray pinhole cameras are widely used to measure the transverse beam profile in synchrotron light sources. In phase-I we will adopt the two methods to be the beam size monitor. The visible SR interferometer uses a double slit to obtain one-dimensional interference pattern along the horizontal or vertical axis. The simple X-ray pinhole camera is designed for the measurement of the size, the emittance and energy spread of the electron beam. In this paper we present the design and calculation of the two beam size monitors for TPS.

TUPA02	Modernized of the Booster Synchrotron Diagnostics in the Taiwan Light Source	booster, synchrotron, kicker, extraction	329
	C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Taiwan Light Source is an 1.5 GeV synchrotron based light source which dedicated almost 20 year ago. During several major and minor upgrades, the TLS operate in top-up mode. To provide a better operation of the injector for the TLS, several minor upgrade in diagnostics are proceed recently. Efforts of these upgrades and modifications will summary in this report.

TUPA42	Diagnostics Beamline Optimisation and Image Processing for Sub-ps Streak Camera Bunch Length Measurement	synchrotron, optics, synchrotron-radiation, controls	445
	C.A. Thomas, I.P.S. Martin, G. Rehm Diamond, Oxfordshire, United Kingdom
	Low alpha beam lattice at Diamond can generate bunch length as small as 0.6ps. In order to be able to measure reliably such a short bunch, we have been optimising the optical design of the visible Diagnostics beamline, and we have implemented image processing, taking into account the point spread function of the streak camera. The beamline optical design has removed a large chirp of 15ps/150nm bandwidth to 2ps /200nmbandwidth. It has also permit the transport of almost all the available power, increasing the power by a factor 20, yet maintaining the possibility to focus the beam down to less than 20um into the streak camera for the best static streak camera point spread function. The deconvolution technique implemented extends the performance of the streak camera to bunch length measurement much smaller than the 1ps PSF of the streak camera. In this paper we present these two essential features required to measure sub-ps bunched with a streak camera.

TUPA47	Middle-infrared Prism Spectrometer for Single-shot Bunch Length Diagnostics at the LCLS	detector, laser, optics, diagnostics	463
	T.J. Maxwell, Y. Ding, A.S. Fisher, J.C. Frisch, H. Loos SLAC, Menlo Park, California, USA C. Behrens DESY, Hamburg, Germany
	Funding: Work supported in part by US Department of Energy contract number DE-AC02-76SF00515. Modern high-brightness accelerators such as laser plasma wakefield and free-electron lasers continue the drive to ever-shorter bunches. At low-charge (< 20 pC), bunches as short as 10 fs are reported at the Linac Coherent Light Source (LCLS). Advanced time-resolved diagnostics approaching the fs-level have been proposed requiring the support of rf-deflectors, modern laser systems, or other complex systems. Though suffering from a loss of phase information, spectral diagnostics remain appealing by comparison as compact, low-cost systems suitable for deployment in beam dynamics studies and operations instrumentation. Progress in mid-IR imaging and detection of the corresponding micrometer-range power spectrum has led to the continuing development of a single-shot, 1.2 - 40 micrometer prism spectrometer for ultra-short bunch length monitoring. In this paper we report further analysis and experimental progress on the spectrometer installation at LCLS.

TUPB60	Beam Diagnostics of Central Japan Synchrotron Radiation Research Facility Accelerator Complex	synchrotron, electron, booster, synchrotron-radiation	486
	M. Hosaka, A. Mano, H. Morimoto, E. Nakamura, K. Takami, T. Takano, Y. Takashima, N. Yamamoto Nagoya University, Nagoya, Japan Y. Hori KEK, Ibaraki, Japan M. Katoh UVSOR, Okazaki, Japan S. Koda SAGA, Tosu, Japan A. Murata, K. Nakayama Toshiba, Yokohama, Japan S. Sasaki JASRI/SPring-8, Hyogo-ken, Japan
	A new synchrotron radiation facility, Central Japan Synchrotron Radiation Research Facility is built in Aichi area. The light source accelerator complex consists of a 1.2 GeV compact electron storage ring and a full energy injector for top-up operation. The key equipments of the accelerator are four 5 T superconductive bending magnets. Although the acceleration energy of the storage ring is relatively low, synchrotron radiation from the superconductive bending magnet reaches hard X-ray region and can be provided for more than 10 beamlines. Construction of the facility started in 2010 and finished in Apr. 2012. Commissioning of the accelerator complex started in Mar. 2012. We adapted a turn-by-turn beam position monitoring system based on a digital oscilloscope developed at the UVSOR. In the presentation, we report on details of beam diagnostics conducted during the commissioning.

TUPB63	Development of Turn-by-turn Beam Diagnostic System using Undulator Radiation	diagnostics, injection, undulator, timing	492
	M. Masaki, A. Mochihashi, H. Ohkuma, S. Takano, K. Tamura JASRI/SPring-8, Hyogo-ken, Japan
	At the diagnostic beamline II (BL05SS) of the SPring-8 storage ring, a turn-by-turn beam diagnostic system using undulator radiation has been developed to observe fast phenomena such as stored beam oscillations during the top-up injections, blowups of beam size and energy spread coming from the instabilities of a high current single bunch and so on. The fast diagnostic system observes a spatial profile of the undulator radiation on a selected harmonic number. Especially, the higher harmonic radiations than the 10th-order are sensitive to the energy spread. A fluorescence screen (YAG:Ce) with afterglow of several tens of nano-second converts the radiation profile into visible light image. The imaging optics makes the horizontal and vertical profiles as two line images by one-dimensional focusing using cylindrical lenses. A fast-gated CCD camera with image intensifier simultaneously captures the two line images. The kinetics readout mode of the fast CCD camera is used to register the spatial profiles of several tens of turns in one flame. The principle and experimental setup of the turn-by-turn diagnostic system, and examples of beam observations will be presented.

TUPB74	Diamond Mirrors for the SuperKEKB Synchtron Radiation Monitor	simulation, extraction, synchrotron, synchrotron-radiation	515
	J.W. Flanagan, A. Arinaga, H. Fukuma, H. Ikeda KEK, Ibaraki, Japan
	The SuperKEKB accelerator, a 40x luminosity upgrade to the KEKB accelerator, will be a high-current, low-emittance double ring collider. The beryllium primary extraction mirrors used for the synchrotron radiation monitors at KEKB suffered from heat distortion due to incident synchrotron radiation, leading to systematic changes in magnification with beam current and necessitating continuous monitoring and compensation of such distortions in order to correctly measure the beam sizes. The heat loads on the extraction mirrors will be higher at SuperKEKB, with heat-induced magnification changes up to 40% expected if the same mirrors were used as at KEKB. We are working on a design based on mirrors made of quasi-monocrystalline diamond, which has much higher heat conductance and a lower thermal expansion coefficient than beryllium. With such mirrors it is targeted to reduce the beam current-dependent magnification effects to the level of a few percent at SuperKEKB. Measurements of heat-induced deformations on fabricated prototype mirrors will be presented, along with comparisons with the results of numerical simulations.

TUPB76	Intra Undulator Screen Diagnostics for the FERMI@Elettra FEL	FEL, electron, laser, undulator	519
	M. Veronese, A. Abrami, E. Allaria, M. Bossi, A. Bucconi, M. De Marco, M. Ferianis, L. Fröhlich, L. Giannessi, S. Grulja, R. Sauro, C. Spezzani, M. Tudor Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy T. Borden FRIB, East Lansing, Michigan, USA F. Cianciosi ESRF, Grenoble, France
	The FERMI@Elettra seeded FEL poses demanding requirements in terms of intra undulator diagnostics due to the short wavelength of its FEL radiation and to the coexistence of the electron and photon FEL beams. An advanced multi-beam screen system has equipped both FEL1 and FEL2. The system has been designed for transverse size and profile measurement on both the electron beam and the FEL radiation. Challenging design constrains are present: COTR suppression, seed laser suppression, FEL wavelength range and minimization of the ionizing radiation delivered to the undulators. This paper describes the novel design and the obtained performance with the FERMI intra undulator screen system (IU-FEL).

TUPB77	Measurement of the Frequency Spectrum on the Beam Profile Controlled by RF Kicker	storage-ring, betatron, detector, operation	524
	Y. Yamamoto Ritsumeikan University, Kusatsu-City, Shiga, Japan
	The frequency spectrum on the beam profile was measured at the compact superconducting storage ring of Ritsumeikan University. The radiation detector was used an avalanche photodiode module with a high frequency response of 1 GHz for the visible ray. Signals from the detector were transferred to a spectrum analyzer. The beam profile was magnified strongly by a conventional profile monitor system. We scanned the beam profile in vertical direction by shifting the detector. The distribution of peak intensity as a function of the position on beam profile was obtained.

WECC01	IFMIF-LIPAc Diagnostics and its Challenges	diagnostics, neutron, rfq, linac	557
	J. Marroncle, P. Abbon, J.F. Denis, J. Egberts, J.-F. Gournay, F. Jeanneau, A. Marchix, J.-Ph. Mols, T. Papaevangelou CEA/IRFU, Gif-sur-Yvette, France J.C. Calvo, J.M. Carmona, P. Fernández, A. Guirao, D. Iglesias, C. Oliver, I. Podadera, A. Soleto CIEMAT, Madrid, Spain M. Poggi INFN/LNL, Legnaro (PD), Italy M. Pomorski CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
	The International Fusion Materials Irradiation Facility (IFMIF) aims at providing a very intense neutron source (10¹⁷ neutron/s) to test the structure materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). Such a source will be driven using 2 deuteron accelerators 125 mA cw up to 40 MeV impinging into a lithium liquid curtain, thus producing very high neutron flux with a similar spectrum as those expected in fusion reactors. A validation phase was decided for this 10 MW facility consisting partly in the design of the prototype accelerator LIPAc (Linear IFMIF Prototype Accelerator). LIPAc, which is in design phase, will accelerate a 125 mA cw beam deuteron up to the first superconductive linac module (4 for IFMIF). The 9 MeV beam will be driven through a HEBT to beam dump. This facility is currently under construction at Rokkasho (Japan). We propose to describe the beam diagnostics foreseen for this 1.125 MW accelerator emphasizing the challenges encountered and the overcome solutions, if any.
	Slides WECC01 [14.988 MB]

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MOCB01

Beam Instrumentation for the SuperKEKB Rings

detector, feedback, kicker, damping

6

H. Fukuma, A. Arinaga, J.W. Flanagan, H. Ikeda, H. Ishii, S. Kanaeda, K. Mori, M. Tejima, M. Tobiyama
KEK, Ibaraki, Japan
G. Bonvicini, H. Farhat, R.S. Gillard
Wayne State University, USA
G.S. Varner
University of Hawaii, Honolulu, HI, USA

The electron-positron collider KEKB B-factory is currently being upgraded to SuperKEKB. The design luminosity of 8 x 10³⁵ /cm²/s will be achieved using beams with low emittance of several nm and doubling beam currents to 2.6 A in the electron ring (HER) and 3.6 A in the positron ring (LER). A beam position monitor (BPM) system of HER and LER will be equipped with super-heterodyne detectors, turn by turn log ratio detectors with fast gates to measure optics parameters during collision operation and detectors of BPMs near the collision point (IP) for orbit feedback to maintain stable collision. New X-ray beam profile monitors based on the coded aperture method will be installed aiming at bunch by bunch measurement of the beam profile. A large angle beamstrahlung monitor detecting polarization of the synchrotron radiation generated by beam-beam interaction will be installed near IP to obtain information about the beam-beam geometry. The bunch by bunch feedback system will be upgraded using low noise frontend electronics and new 12 bits iGp digital filters. An overview of beam instrumentation of SuperKEKB rings will be given in this paper.

Slides MOCB01 [8.073 MB]

MOCC01

UV/X-ray Diffraction Radiation for Non-intercepting Micron-scale Beam Size Measurement

target, experiment, electron, background

24

L.M. Bobb, N. Chritin, T. Lefèvre
CERN, Geneva, Switzerland
M.G. Billing
CLASSE, Ithaca, New York, USA
L.M. Bobb, V. Karataev
JAI, Egham, Surrey, United Kingdom

Diffraction Radiation (DR) is produced when a relativistic charged particle moves in the vicinity of a medium. The electric field of the charged particle polarizes the target atoms which then oscillate, emitting radiation with a very broad spectrum. The spatial-spectral properties of DR are sensitive to a range of electron beam parameters. Furthermore, the energy loss due to DR is so small that the electron beam parameters are unchanged. Therefore DR can be used to develop non-invasive diagnostic tools. The aim of this project is to measure the transverse (vertical) beam size using incoherent DR. To achieve the micron-scale resolution required by CLIC, DR in the UV and X-ray spectral-range must be investigated. During the next few years, experimental validation of such a scheme will be conducted on the CesrTA at Cornell University, USA. Here we present the current status of the experiment preparation.

Slides MOCC01 [3.064 MB]

MOCC04

Improvement of Screen Monitor with Suppression of Coherent-OTR Effect for SACLA

electron, target, emittance, operation

34

S. Matsubara, Y. Otake
RIKEN/SPring-8, Hyogo, Japan
S.I. Inoue
SES, Hyogo-pref., Japan
H. Maesaka
RIKEN Spring-8 Harima, Hyogo, Japan

The construction of SACLA (SPring-8 Angstrom Compact free electron LAser) was already completed and it is under operation. A screen monitor (SCM) system has been developed and was installed in order to obtain a direct image of a transverse beam profile with a spatial resolution of about 10 um, which is required to investigate electron-beam properties, such as a beam emittance. The SCM originally has a stainless steel target as a OTR radiator or a Ce:YAG crystal as a scintillation target. At the beginning of the SACLA operation, strong coherent OTR (COTR), which made an incorrect beam profile, was observed after bunch compressors. In order to suppress the COTR on the SCM, the stainless steel target was replaced to the Ce:YAG scintillation target. Since the COTR was still generated from the Ce:YAG target, a spatial mask was employed. The mask was mounted on the center of the optical line of the SCM, because the COTR light is emitted forward within ~1/γ radian, while the scintillation light has not angular dependence. Clear beam profiles with a diameter of a few tens of micro-meter are observed by means of the SCMs with this simple improvement.

Slides MOCC04 [1.618 MB]

MOIC02

Electron Beam Diagnostic System for the Japanese XFEL, SACLA

undulator, electron, emittance, cavity

38

H. Maesaka, H. Ego, C. Kondo, T. Ohshima, Y. Otake, H. Tomizawa
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
S. Matsubara, T. Matsumoto, K. Yanagida
JASRI/SPring-8, Hyogo, Japan

An x-ray free-electron laser (XFEL) based on self-amplified spontaneous emission (SASE) requires a highly brilliant electron beam. The Japanese XFEL facility, SACLA, requires a normalized emittance less than 1 mm mrad and a peak current more than 3 kA. To achieve this high peak current, 1 A beam with 1 ns duration from a thermionic electron gun is compressed down to 30 fs by means of a multi-stage bunch compressor system. Therefore, the beam diagnostic system for SACLA was designed for the measurements of the emittance and bunch length at each compression stage. We developed a high-resolution transverse profile monitor and a temporal bunch structure measurement system with a C-band rf deflector cavity etc. In addition, precise overlapping between an electron beam and radiated x-rays in the undulator section is necessary to ensure the XFEL interaction. Therefore, we employed a C-band sub-micron resolution RF-BPM to fulfill the demanded accuracy of 4 um. The beam diagnostic system surely contributed to the first x-ray lasing at a wavelength of 1.2 Angstrom. We present a design strategy of the whole beam diagnostic system and the achieved performance for each monitor.

Slides MOIC02 [7.861 MB]

MOPA06

VIMOS, New Capabilities for an Optical Safety System

target, proton, diagnostics, software

57

K. Thomsen, J. Devlaminck
PSI, Villigen PSI, Switzerland

VIMOS is a dedicated safety system developed at the Spallation Neutron Source SINQ at the Paul Scherrer Institut, PSI, in Switzerland. VIMOS very directly monitors the correct current density distribution of the proton beam on the target by sampling the light emitted from a glowing mesh heated by the passing protons. The design has been optimized for obtaining maximum sensitivity and timely detection of beam irregularities relying on standard well-proven components. Recently it has been demonstrated that technical boundary conditions like radiation level and signal strength should allow for upgrading the system to a sensitive diagnostic device delivering quantitative and image-resolved values for the proton current density distribution on the SINQ target. By determining the temperature of the glowing mesh from the signals in two separate wavelength bands the temperature distribution over the mesh can be derived und subsequently the incident proton beam current density distribution. Work aimed at investigating the feasibility of adding these diagnostic abilities to VIMOS shows initial promising results. The status of the project and preliminary findings will be reported.

MOPA09

Comparison of Three Different Concepts of High Dynamic Range and Dependability Optimised Current Measurement Digitisers for Beam Loss Systems

monitoring, status, detector, operation

66

W. Viganò, B. Dehning, E. Effinger, G.G. Venturini, C. Zamantzas
CERN, Geneva, Switzerland

The first concept is based on current to frequency conversion, enhanced with an ADC for extending the dynamic range and decreasing the response time. A summary of 3 years worth of operational experience with such a system for LHC beam loss monitoring will be given. The second principle is based on an adaptive current to frequency converter implemented in an ASIC. The basic parameters of the circuit are discussed and compared with measurements. Several measures are taken to harden both circuits against single event effects and to make them tolerant for operation in radioactive environments. The third circuit is based on a fully differential integrator for enhanced dynamic range, where laboratory and test installation measurements will be presented. All circuits are designed to avoid any dead time in the acquisition and have reliability and fail safe operational considerations taken into account.

MOPA12

Characterization of a Wide Dynamic-range, Radiation-tolerant Charge-digitizer ASIC for Monitoring of Beam Losses

operation, detector, FPGA, monitoring

74

G.G. Venturini, F. Anghinolfi, B. Dehning
CERN, Geneva, Switzerland
M. Kayal
EPFL, Lausanne, Switzerland

An Application Specific Integrated Circuit (ASIC) has been designed and fabricated to provide a compact solution to digitize current signals from ionization chambers and diamond detectors, employed as beam loss monitors at CERN and several other high energy physics facilities. The circuit topology has been devised to accept positive and negative currents, to have a wide dynamic range (above 120 dB), withstand radiation levels over 100kGy and offer different modes of operation, covering a broad range of applications. Furthermore, an internal conversion reference is employed in the digitization, to provide an accurate absolute measurement. This paper discusses the detailed characterization of the first prototype: linearity, radiation tolerance and temperature dependence of the conversion, as well as implications and system-level considerations regarding its use for beam instrumentation applications in a high energy physics facility.

MOPA33

Image Profile Diagnostics Solution for the Taiwan Photon Source

synchrotron, booster, synchrotron-radiation, EPICS

125

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

TPS (Taiwan Photo Source) is a third generation 3 GeV synchrotron light facility, featuring ultra-high photon brightness with extremely low emittance which will be a state-of-the-art synchrotron radiation facility and is being in construction at National Synchrotron Radiation Research Center (NSRRC) campus. Beam image profile and its analysis play an important role in beam diagnostics of a particle accelerator system. However, due to the CCD image collection devices are distributed around the linac, booster, and storage ring, a distributed EPICS system based image profile diagnostics solution was proposed, which are based on GigE Vision camera with PoE support. This solution provides an easy way for cabling, and delivery adequate performance. Implementation plan for the TPS and results of prototype test at existed facility to examine functionality of hardware and software will be summarized in this report.

MOPA42

Measurements of Martin-Puplett Interferometer Limitations using Blackbody Source

detector, FEL, vacuum, experiment

153

P.E. Evtushenko, J.M. Klopf
JLAB, Newport News, Virginia, USA

Frequency domain measurements with Martin-Puplett interferometer is one of a few techniques capable of bunch length measurements at the level of ~ 100 fs. As the bunch length becomes shorter, it is important to know and be able to measure the limitations of the instrument in terms of shortest measurable bunch length. In this paper we describe experiment of using blackbody source with the modified Matrin-Puplett interferometer that is routinely used for bunch length measurements at the JLab FEL, as a way to estimate the shortest, measurable with the device, bunch. The limitation comes from high frequency cut-off of the presently used wire-grid polarizer and is estimated to be 50 fs RMS. The measurements are made with the same Golay cell detector that is used for beam measurements. We demonstrate that, even though the blackbody source is many orders of magnitude less bright than the coherent transition or synchrotron radiation, it can be used for the measurements and gives a very good signal to noise ratio in a combination with lock-in detection. We also compare the measurements made in air and in vacuum to show the very strong effect of the atmospheric absorption.

MOPB53

Hartmann Screen and Wavefront Sensor System for Extracting Mirror at SSRF

synchrotron, synchrotron-radiation, optics, extraction

191

J. Chen, Y.B. Leng, K.R. Ye
SINAP, Shanghai, People's Republic of China

A Be mirror was used to extract visible synchrotron radiation light from bending magnet at SSRF. The surface of mirror was deformed because of X-ray heat. A set of Hartmann Screen Test was used to measure the surface of the mirror. Another equipment named The Shack-Hartmann wavefront sensor system was introduced to get more precision data. The result of two kind of test match each other well.

MOPB65

Measurement of Sub-picosecond Bunch Length with the Interferometry from Double Diffraction Radiation Target

electron, target, detector, simulation

218

G.A. Naumenko, A. Potylitsyn, M.V. Shevelev, D.A. Shkitov
TPU, Tomsk, Russia
H.X. Deng, S.L. Lu, T. Yu, J.B. Zhang
SINAP, Shanghai, People's Republic of China

Funding: This work was supported by the joint Russian-Chinese grant (RFBR N 110291177 and NSFC N 11111120065) and partially by the Program of Russian MES 'Nauka' and Chinese NSFC grant N 11175240.
Reliable and precise methods for non-invasive diagnostics of sub-picosecond electron bunches are required for new accelerator facilities (FEL, LWFA, et al.). Measurements of spectral characteristics of coherent radiation generated by such bunches using interferometer allow to determine a bunch length [1]. The interference pattern obtained by two diffraction radiation (DR) beams from two shifted plates (double DR target) may be used instead an interferometer [2]. Recently the coherent DR interferometry scheme at the SINAP accelerator facility was established [3]. Here we report the results of comparing the first measurement from such a technique with the measurement from Michelson interferometer. The parameters of fs linac are described in [4]. The DR target was consisted of two plates made from aluminum foil. The pyroelectric detector SPI-D-62 was used. The analysis of results from two techniques gives the same estimated bunch length about 660 fs (0.2 mm), which confirms the ability of the proposed technique for non-invasive bunch length measurements in the sub-picosecond range without a complicated scheme like Michelson interferometer or similar.
1. Murokh A.et al.,NIMA 410(1998)452
2. Potylitsyn A.P.,NIMB 227(2005)191
3. Shevelev M. et al.,Journal of Physics: Conference Series 357(2012)
4. Lin X.et al., Chin. Phys. Lett.27,4(2010)044101

MOPB67

Development of Offner Relay Optical System for OTR Monitor at 3-50 Beam Transport Line of J-PARC

target, proton, optics, beam-transport

222

M. Tejima, T.M. Mitsuhashi
KEK, Ibaraki, Japan
Y. Hashimoto, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
S. Otsu
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

An extremely wide aperture relay optical system based on Offner system has been designed and constracted for OTR monitor at 3-50 beam transport line of J-PARC. Diagnostics for beam profile and halo are very important to optimize injection beam from RCS to MR in J-PARC. For this purpose, an OTR monitor is planed to install for an observation of image of the beam and halo after the beam collimators. Since opening of OTR is very wide due to small Gamma; 3.2, extremely wide aperture (500mrad) optics will necessary to extract OTR from file target. We designed Offner type relay optics for the effective extraction of OTR having F=0.83. The clear aperture will cover 100 x 100mm aria on the target screen. Results of optical testing and design of OTR monitor will present in this paper.

MOPB68

Development of Profile Monitor System for High Intense Spallation Neutron Source

target, neutron, proton, remote-handling

227

S.I. Meigo, A. Akutsu, M. Futakawa, K. Ikezaki, M. Ooi, S. Sakamoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

At the JSNS in J-PARC, a mercury target is employed as the neutron production target. It is well known that the damage on the mercury target is promotional to the 4th power of the peak current density of the primary proton beam on the target. For the high intense neutron source, the profile on the target is important to drive the neutron source with the continuously observation of the profile. We have developed to Multi Wire Profile Monitor System (MWPM). During beam operation, when the abnormally of the beam is found, the beam is cut out by the Machine Protection System (MPS). For the measurement of the two dimension observation on the target, we have developed the system based on the residual radiation measurement by using an imaging plate (IP), It is found that the both result by the MWPM and IP shows good agreement.

MOPB70

The Synchrotron Radiation Diagnostic Line at SSRF

emittance, synchrotron, synchrotron-radiation, feedback

232

J. Chen, Z.C. Chen, G.Q. Huang, Y.B. Leng, K.R. Ye, W.M. Zhou
SINAP, Shanghai, People's Republic of China

The synchrotron radiation photon beam line has been operated since 2009 at Shanghai Synchrotron Radiation Facility. There are two diagnostic beam lines of the storage ring behind bending magnet, which is employed conventional X-ray and visible imaging techniques. A synchrotron radiation (SR) interferometer using visible light region in order to measure the small transverse electron beam size (about 22μm); low emittance and a low coupling. A small off-axis mirror is set for the convenience of the observation. Wave front testing is used for interferometer to calibrate the deformation effect of optical components. An X-ray pin-hole camera is also employed in the diagnostics beamline of the ring to characterize beam. Typically the point spread function of the X-ray pinhole camera is calculated via analytical or numerical method. Those two methods check each other. As a result, the measurement with SR system has quite enough resolution of itself even though the absolute beam size acquired. The existed system suffers with dynamic problem for beam physics studies. It has been measured 2.8nm.rad in small emittance mode at SSRF.

MOPB76

Evaluation of a Fluorescent Screen with a CCD System for Quality Assurance in Heavy-Ion Beam Scanning Irradiation System

ion, heavy-ion, controls, background

249

Y. Hara, T. Furukawa, T. Inaniwa, K. Mizushima, K. Noda, S. Sato, T. Shirai, E. Takeshita
NIRS, Chiba-shi, Japan

The precise heavy-ion therapy such as the scanning irradiation system necessitates the precise quality assurance (QA) procedures to verify the performance of therapeutic scanned ion beams. To evaluate the uniformity of the 2D field, radiographic film is used due to its high spatial resolution and suit for the measurements of the integral dose. However, this technique is time consuming. Thus, we developed the QA tool with high spatial resolution to verify accuracy of the lateral size, position and uniformity of scanned ion beams in clinical application at the HIMAC, which we called the QA-SCN. The QA-SCN consists of a fluorescent screen, a CCD camera, a mirror, camera controllers and a dark box to protect against surrounding light. In this paper, to evaluate the performance of the QA-SCN, we compared the results obtained by using it with the measurements by radiographic film performed in the same experimental conditions. Also, we verified several types of corrections about errors, e.g. background, vignetting, to distort the measurement results. As a result, we confirmed that the QA-SCN can be used as the system for QA procedures of therapeutic scanned ion beams.

MOPB81

Residual Gas Ionization Profile Monitors in J-PARC Slow-extraction Beam Line

electron, proton, extraction, vacuum

267

Y. Sato, A. Agari, E. Hirose, M. Ieiri, Y. Katoh, M. Minakawa, R. Muto, M. Naruki, S. Sawada, Y. Shirakabe, Y. Suzuki, H. Takahashi, M. Takasaki, K.H. Tanaka, A. Toyoda, H. Watanabe, Y. Yamanoi
KEK, Tsukuba, Japan
H. Noumi
RCNP, Osaka, Japan

Residual gas ionization profile monitors (RGIPMs) working in 1 Pa pressure have been developed for high-intensity proton beam (maximum: 50GeV-15uA) at J-PARC slow-extraction beam line. The transverse beam profiles are measured by collecting electrons produced by ionization of 1 Pa residual gas. The electrons are guided to the segmented electrode with a uniform electrostatic field applied in the gap. A uniform magnetic field is applied parallel to the electric field to reduce diffusion of electrons travelling to the electrodes. Typical spatial resolution of the RGIPMs with a 10 cm gap, a 10 V/cm electrostatic field, and a 400 gauss magnetic field at center is 0.5 mm. The collected charge is integrated during every extraction period (typically 2 second in 6 second accelerator cycle). Subtracting background distributions measured during off-beam period, profile distributions are measured clearly. The 14 RGIPMs installed in the slow-extraction beam line are working stably for the 30 GeV-0.46 uA proton beam at current maximum. In this contribution, detailed specifications and performance of the present RGIPMs will be reported.

MOPB88

Beam Size Monitor for TPS

photon, electron, synchrotron, synchrotron-radiation

291

C.K. Kuan, S.Y. Perng, I.C. Sheng, T.C. Tseng
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

The third-generation light source TPS is under construction in NSRRC. There are two diagnostic beamlines in the storage ring. Visible SR interferometers and X-ray pinhole cameras are widely used to measure the transverse beam profile in synchrotron light sources. In phase-I we will adopt the two methods to be the beam size monitor. The visible SR interferometer uses a double slit to obtain one-dimensional interference pattern along the horizontal or vertical axis. The simple X-ray pinhole camera is designed for the measurement of the size, the emittance and energy spread of the electron beam. In this paper we present the design and calculation of the two beam size monitors for TPS.

TUPA02

Modernized of the Booster Synchrotron Diagnostics in the Taiwan Light Source

booster, synchrotron, kicker, extraction

329

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

Taiwan Light Source is an 1.5 GeV synchrotron based light source which dedicated almost 20 year ago. During several major and minor upgrades, the TLS operate in top-up mode. To provide a better operation of the injector for the TLS, several minor upgrade in diagnostics are proceed recently. Efforts of these upgrades and modifications will summary in this report.

TUPA42

Diagnostics Beamline Optimisation and Image Processing for Sub-ps Streak Camera Bunch Length Measurement

synchrotron, optics, synchrotron-radiation, controls

445

C.A. Thomas, I.P.S. Martin, G. Rehm
Diamond, Oxfordshire, United Kingdom

Low alpha beam lattice at Diamond can generate bunch length as small as 0.6ps. In order to be able to measure reliably such a short bunch, we have been optimising the optical design of the visible Diagnostics beamline, and we have implemented image processing, taking into account the point spread function of the streak camera. The beamline optical design has removed a large chirp of 15ps/150nm bandwidth to 2ps /200nmbandwidth. It has also permit the transport of almost all the available power, increasing the power by a factor 20, yet maintaining the possibility to focus the beam down to less than 20um into the streak camera for the best static streak camera point spread function. The deconvolution technique implemented extends the performance of the streak camera to bunch length measurement much smaller than the 1ps PSF of the streak camera. In this paper we present these two essential features required to measure sub-ps bunched with a streak camera.

TUPA47

Middle-infrared Prism Spectrometer for Single-shot Bunch Length Diagnostics at the LCLS

detector, laser, optics, diagnostics

463

T.J. Maxwell, Y. Ding, A.S. Fisher, J.C. Frisch, H. Loos
SLAC, Menlo Park, California, USA
C. Behrens
DESY, Hamburg, Germany

Funding: Work supported in part by US Department of Energy contract number DE-AC02-76SF00515.
Modern high-brightness accelerators such as laser plasma wakefield and free-electron lasers continue the drive to ever-shorter bunches. At low-charge (< 20 pC), bunches as short as 10 fs are reported at the Linac Coherent Light Source (LCLS). Advanced time-resolved diagnostics approaching the fs-level have been proposed requiring the support of rf-deflectors, modern laser systems, or other complex systems. Though suffering from a loss of phase information, spectral diagnostics remain appealing by comparison as compact, low-cost systems suitable for deployment in beam dynamics studies and operations instrumentation. Progress in mid-IR imaging and detection of the corresponding micrometer-range power spectrum has led to the continuing development of a single-shot, 1.2 - 40 micrometer prism spectrometer for ultra-short bunch length monitoring. In this paper we report further analysis and experimental progress on the spectrometer installation at LCLS.

TUPB60

Beam Diagnostics of Central Japan Synchrotron Radiation Research Facility Accelerator Complex

synchrotron, electron, booster, synchrotron-radiation

486

M. Hosaka, A. Mano, H. Morimoto, E. Nakamura, K. Takami, T. Takano, Y. Takashima, N. Yamamoto
Nagoya University, Nagoya, Japan
Y. Hori
KEK, Ibaraki, Japan
M. Katoh
UVSOR, Okazaki, Japan
S. Koda
SAGA, Tosu, Japan
A. Murata, K. Nakayama
Toshiba, Yokohama, Japan
S. Sasaki
JASRI/SPring-8, Hyogo-ken, Japan

A new synchrotron radiation facility, Central Japan Synchrotron Radiation Research Facility is built in Aichi area. The light source accelerator complex consists of a 1.2 GeV compact electron storage ring and a full energy injector for top-up operation. The key equipments of the accelerator are four 5 T superconductive bending magnets. Although the acceleration energy of the storage ring is relatively low, synchrotron radiation from the superconductive bending magnet reaches hard X-ray region and can be provided for more than 10 beamlines. Construction of the facility started in 2010 and finished in Apr. 2012. Commissioning of the accelerator complex started in Mar. 2012. We adapted a turn-by-turn beam position monitoring system based on a digital oscilloscope developed at the UVSOR. In the presentation, we report on details of beam diagnostics conducted during the commissioning.

TUPB63

Development of Turn-by-turn Beam Diagnostic System using Undulator Radiation

diagnostics, injection, undulator, timing

492

M. Masaki, A. Mochihashi, H. Ohkuma, S. Takano, K. Tamura
JASRI/SPring-8, Hyogo-ken, Japan

At the diagnostic beamline II (BL05SS) of the SPring-8 storage ring, a turn-by-turn beam diagnostic system using undulator radiation has been developed to observe fast phenomena such as stored beam oscillations during the top-up injections, blowups of beam size and energy spread coming from the instabilities of a high current single bunch and so on. The fast diagnostic system observes a spatial profile of the undulator radiation on a selected harmonic number. Especially, the higher harmonic radiations than the 10th-order are sensitive to the energy spread. A fluorescence screen (YAG:Ce) with afterglow of several tens of nano-second converts the radiation profile into visible light image. The imaging optics makes the horizontal and vertical profiles as two line images by one-dimensional focusing using cylindrical lenses. A fast-gated CCD camera with image intensifier simultaneously captures the two line images. The kinetics readout mode of the fast CCD camera is used to register the spatial profiles of several tens of turns in one flame. The principle and experimental setup of the turn-by-turn diagnostic system, and examples of beam observations will be presented.

TUPB74

Diamond Mirrors for the SuperKEKB Synchtron Radiation Monitor

simulation, extraction, synchrotron, synchrotron-radiation

515

J.W. Flanagan, A. Arinaga, H. Fukuma, H. Ikeda
KEK, Ibaraki, Japan

The SuperKEKB accelerator, a 40x luminosity upgrade to the KEKB accelerator, will be a high-current, low-emittance double ring collider. The beryllium primary extraction mirrors used for the synchrotron radiation monitors at KEKB suffered from heat distortion due to incident synchrotron radiation, leading to systematic changes in magnification with beam current and necessitating continuous monitoring and compensation of such distortions in order to correctly measure the beam sizes. The heat loads on the extraction mirrors will be higher at SuperKEKB, with heat-induced magnification changes up to 40% expected if the same mirrors were used as at KEKB. We are working on a design based on mirrors made of quasi-monocrystalline diamond, which has much higher heat conductance and a lower thermal expansion coefficient than beryllium. With such mirrors it is targeted to reduce the beam current-dependent magnification effects to the level of a few percent at SuperKEKB. Measurements of heat-induced deformations on fabricated prototype mirrors will be presented, along with comparisons with the results of numerical simulations.

TUPB76

Intra Undulator Screen Diagnostics for the FERMI@Elettra FEL

FEL, electron, laser, undulator

519

M. Veronese, A. Abrami, E. Allaria, M. Bossi, A. Bucconi, M. De Marco, M. Ferianis, L. Fröhlich, L. Giannessi, S. Grulja, R. Sauro, C. Spezzani, M. Tudor
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
T. Borden
FRIB, East Lansing, Michigan, USA
F. Cianciosi
ESRF, Grenoble, France

The FERMI@Elettra seeded FEL poses demanding requirements in terms of intra undulator diagnostics due to the short wavelength of its FEL radiation and to the coexistence of the electron and photon FEL beams. An advanced multi-beam screen system has equipped both FEL1 and FEL2. The system has been designed for transverse size and profile measurement on both the electron beam and the FEL radiation. Challenging design constrains are present: COTR suppression, seed laser suppression, FEL wavelength range and minimization of the ionizing radiation delivered to the undulators. This paper describes the novel design and the obtained performance with the FERMI intra undulator screen system (IU-FEL).

TUPB77

Measurement of the Frequency Spectrum on the Beam Profile Controlled by RF Kicker

storage-ring, betatron, detector, operation

524

Y. Yamamoto
Ritsumeikan University, Kusatsu-City, Shiga, Japan

The frequency spectrum on the beam profile was measured at the compact superconducting storage ring of Ritsumeikan University. The radiation detector was used an avalanche photodiode module with a high frequency response of 1 GHz for the visible ray. Signals from the detector were transferred to a spectrum analyzer. The beam profile was magnified strongly by a conventional profile monitor system. We scanned the beam profile in vertical direction by shifting the detector. The distribution of peak intensity as a function of the position on beam profile was obtained.

WECC01

IFMIF-LIPAc Diagnostics and its Challenges

diagnostics, neutron, rfq, linac

557

J. Marroncle, P. Abbon, J.F. Denis, J. Egberts, J.-F. Gournay, F. Jeanneau, A. Marchix, J.-Ph. Mols, T. Papaevangelou
CEA/IRFU, Gif-sur-Yvette, France
J.C. Calvo, J.M. Carmona, P. Fernández, A. Guirao, D. Iglesias, C. Oliver, I. Podadera, A. Soleto
CIEMAT, Madrid, Spain
M. Poggi
INFN/LNL, Legnaro (PD), Italy
M. Pomorski
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France

The International Fusion Materials Irradiation Facility (IFMIF) aims at providing a very intense neutron source (10¹⁷ neutron/s) to test the structure materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). Such a source will be driven using 2 deuteron accelerators 125 mA cw up to 40 MeV impinging into a lithium liquid curtain, thus producing very high neutron flux with a similar spectrum as those expected in fusion reactors. A validation phase was decided for this 10 MW facility consisting partly in the design of the prototype accelerator LIPAc (Linear IFMIF Prototype Accelerator). LIPAc, which is in design phase, will accelerate a 125 mA cw beam deuteron up to the first superconductive linac module (4 for IFMIF). The 9 MeV beam will be driven through a HEBT to beam dump. This facility is currently under construction at Rokkasho (Japan). We propose to describe the beam diagnostics foreseen for this 1.125 MW accelerator emphasizing the challenges encountered and the overcome solutions, if any.

Slides WECC01 [14.988 MB]