IBIC2014 - List of Keywords (operation)

Paper	Title	Other Keywords	Page
MOPF22	Simultaneous Operation of Two FEL Undulator Beamlines at FLASH	undulator, laser, FEL, electron	103
	S. Ackermann, V. Ayvazyan, B. Faatz, E. Hass, K. Klose, S. Pfeiffer, M. Scholz, S. Schreiber DESY, Hamburg, Germany
	The FLASH FEL User Facility at DESY (Hamburg) is driven by a Photocathode RF gun and superconducting RF structures, producing up to 800 electron bunches per train with a repetition rate of 10 Hz. Because not all user experiments need the full pulse train (8000 FEL pulses per second), part of the electron bunches can be deflected into a second beamline, which can simultaneously deliver FEL pulses with different parameters to a second user experiment. To realize this possibility, the FLASH facility has been upgraded with a second undulator line and a second experimental Hall. In this contribution, we will present the new layout of the FLASH facility and the first results to operate it with different parameter sets. We will show present results achieved during the commissioning of the new beamline. Finally, we will give an outlook of further commissioning plans and user operation. S. Ackermann for the FLASH II Team
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MOPD17	Single-Shot Electro-Optical Diagnostics at the ANKA Storage Ring	laser, storage-ring, wakefield, electron	182
	N. Hiller, A. Borysenko, E. Hertle, V. Judin, B. Kehrer, A.-S. Müller, M.J. Nasse, M. Schuh, P. Schönfeldt, N.J. Smale, J.L. Steinmann KIT, Karlsruhe, Germany P. Peier, B. Steffen DESY, Hamburg, Germany V. Schlott PSI, Villigen PSI, Switzerland
	Funding: This work is funded by the BMBF contract numbers: 05K10VKC, 05K13VKA. ANKA is the first storage ring in the world with a near-field single-shot electro-optical (EO) bunch profile monitor. The method of electro-optical spectral decoding (EOSD) uses the Pockels effect to modulate the longitudinal electron bunch profile onto a long, chirped laser pulse passing through an EO crystal. The laser pulse is then analyzed with a single-shot spectrometer and from the spectral modulation, the temporal distribution can be extracted. The setup is tuned to a sub-ps resolution (granularity) and can measure down to bunch lengths of 1.5 ps RMS for bunch charges as low as 30 pC. With this setup it is possible to study longitudinal beam dynamics (e. g. microbunching) occurring during ANKA's low-alpha-operation, an operation mode with longitudinally compressed bunches to generate coherent synchrotron radiation in the THz range. In addition to measuring the longitudinal bunch profile, long-ranging wake-fields trailing the electron bunch can also be studied, hinting bunch-bunch interactions.
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MOPD25	Time Domain Pickup Signal characterization for Low Charge Arrival-Time Measurements at FLASH	pick-up, simulation, laser, electron	209
	A. Angelovski, R. Jakoby, A. Penirschke TU Darmstadt, Darmstadt, Germany M.K. Czwalinna, H. Schlarb, C. Sydlo DESY, Hamburg, Germany T. Weiland TEMF, TU Darmstadt, Darmstadt, Germany
	For the low charge operation mode at the European XFEL, high bandwidth cone-shaped pickups were developed as a part of the Bunch Arrival-time Monitors (BAMs). The simulation showed that the signal parameters of interest, the signal slope and bandwidth are improved by more than a factor of six compared to the state of the art pickups. The pickups are installed at FLASH for verification. In this paper, time-domain measurements of the cone-shaped pickups at FLASH are presented. The pickup signal is recorded with a high bandwidth sampling oscilloscope. Two channel measurements are conducted with a single and a combined pickup signal in order to analyze the orbit and charge dependence of the pickup signal parameters. The measured time domain pickup signal wave form is compared to the CST PARTICLE STUDIO simulation.
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TUPF08	Design, Development and Commissioning of a MTCA-Based Button and Strip-Line BPM System for FLASH2	electronics, timing, undulator, electron	320
	B. Lorbeer, N. Baboi, L.P. Petrosyan, F. Schmidt-Föhre DESY, Hamburg, Germany
	The FLASH (Free Electron Laser in Hamburg) facility at DESY (Deutsches Elektronen-Synchrotron) in Germany has been extended by a new undulator line called FLASH2 to provide twice as many experimental stations for users in the future. After the acceleration of the electron bunch train up to 1.2GeV, a part can be kicked into FLASH2, while the other is going to the old undulator line. In order to tune the wavelength of the SASE (Self Amplified Spontaneous Emission), the new line is equipped with variable gap undulators. The commissioning phase of FLASH2 started in early 2014 and is planned to be continued parasitically during user operation in FLASH1. One key point during first beam commissioning is the availability of standard diagnostic devices such as BPM (Beam Position Monitor). In this paper we present the design and first operational experience of a new BPM system for button and strip-line monitors based on MTCA.4. This is referred to as LCBPM (low charge BPM) in contrast to the old systems at FLASH initially designed for bunch charges of 1nC and higher. We summarize the recent analog and digital hardware development progress[,***] and first commissioning experience of this new BPM system at FLASH2 and present a first estimation of its resolution in a large charge range from 1nC down to 100pC and smaller. flash2.desy.de B. Lorbeer et.al.,TUPA19, IBIC2012 * MTCA.4 (Micro Telecommunications Computing Architecture ) for physics **** Frank Schmidt-Foehre et.al.,IPAC2014 Dresden
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TUPF11	Mechanical Design of Cryogenic Vacuum Feedthroughs for X-FEL Button BPMs	cryogenics, simulation, vacuum, project-management	332
	S. Vilcins, D. Lipka DESY, Hamburg, Germany
	The European XFEL is a 4th generation synchrotron radiation source, currently under construction in Hamburg. Based on different Free-Electron Laser and spontaneous sources and driven by a superconducting accelerator, it will be able to provide several user stations with photons simultaneously. Due to the superconducting technology in the accelerators modules many components have to operate at liquid helium temperature. This poster will concentrate on high frequency ultra high vacuum feedthrough used for the beam position monitors of the cryogenic accelerator modules. Main emphasis will be put on the design of these feedthroughs, their material composition and the production process. The capability to be used under these very special conditions was investigated with FEM simulations, as well as with a test procedure. The results of these simulations will be presented; the tests and their results will be explained in detail.
	Poster TUPF11 [0.407 MB]
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TUPF14	Newly Developed 6mm Buttons for the BPMs in the ESRF Low-Emittance-Ring	coupling, factory, simulation, vacuum	346
	K.B. Scheidt ESRF, Grenoble, France
	For the small beam pipe of the BPMs in the LE-ring a development of 6mm button-UHV-feedthroughs was launched and has resulted in the delivery of a total of 27 prototypes from both the Kyocera and the PMB-ALCEN companies. These buttons are flat, without skirt, with a central pin of Molybdenum ending in a male SMA connector. Among these prototype units are versions with Copper, Steel and Molybdenum material for the button itself, with the aim of assessing possible different heatload issues. All design considerations, that are compatible with a further button reduction to 4mm, will be presented next to issues of costs, mechanical tolerances and feasibility.
	Poster TUPF14 [1.420 MB]
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TUPF27	Optical System for ESS Target Protection	proton, target, FPGA, radiation	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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TUPD05	Optimization of Beam Induced Fluorescence Monitors for Profile Measurements of High Current Heavy Ion Beams at GSI	detector, ion, background, experiment	412
	C. Andre, P. Forck, R. Haseitl, A. Reiter, R. Singh, B. Walasek-Höhne GSI, Darmstadt, Germany
	To cope with the demands of the Facility for Antiproton and Ion Research (FAIR) for high current operation at the GSI Heavy Ion Linear Accelerator UNILAC non intercepting methods for transverse beam profile measurement are required. In addition to intercepting diagnostics like Secondary Electron Emission Grid (SEM-Grid) or scintillating screens, the Beam Induced Fluorescence (BIF) Monitor, an optical measurement device based on the observation of fluorescent light emitted by excited nitrogen molecules, was brought to routine operation. Starting with the first installations in 2008 and consequent improvements, successively six monitors were set up in the UNILAC and in the transfer line (TK) towards the synchrotron SIS18. BIF is used as a standard diagnostic tool to observe the ion beam at kinetic energies between 1.4 and 11.4 MeV/u. Beside the standard operation mode where the gas pressure is varied, further detailed investigations were conducted. The BIF setups were tested with various beam parameters. Different settings of camera, optics and image intensification were applied to improve the image quality for data analysis. In parallel, the light yield from different setups was compared for various ions, charge states, beam energies and particle numbers.
	Poster TUPD05 [0.639 MB]
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TUPD06	CUPID: New System for Scintillating Screen Based Diagnostics	radiation, controls, GUI, 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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TUPD13	Experience with and Studies of the SNS Target Imaging System	target, neutron, simulation, proton	447
	W. Blokland ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 The Target Imaging System (TIS) shows the size and position of the proton beam by using a luminescent Cr:Al2O3 coating on the SNS target. The proton beam hitting the coating creates light which is transferred through mirrors and optical fibers to a digital camera outside the high radiation area. The TIS is used during operations to verify that the beam is in the right location and does not exceed the maximum proton beam peak density. This paper describes our operational experience with the TIS and the results of studies on the linearity, uniformity, and luminescence decay of the coating. In the future, tubes with material samples might be placed in front of the target for irradiation studies. The simulations of placing tubes in the front of target coating and its effect on the beam width and position measurements are also discussed.
	Poster TUPD13 [3.216 MB]
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TUPD23	Real-Time Display System for the Optical Fiber Beam Loss Monitor for the PHIL and ThomX Facilities	beam-losses, radiation, real-time, 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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WECYB1	Development of a Modified Six-Port Discriminator for Precise Beam Position Measurements	pick-up, simulation, detector, electronics	495
	A. Penirschke, A. Angelovski, M. Hansli, R. Jakoby, T. Mahn TU Darmstadt, Darmstadt, Germany
	For the European XFEL, new energy beam position monitors based on planar transmission lines were designed for energy measurements in the dispersive section of bunch compressor chicanes. The EBPM consists of transversely mounted stripline pickups in a rectangular beam pipe section and a signal detection scheme which measures the phases of the pulses at the ends of the pickup. It allows simultaneous measurements of the beam energy and arrival-time. This paper presents the development of a RF readout electronic based on a modified six-port discriminator as a low-cost alternative to the readout electronics based on the MTCA.4 platform for the EBPM. Based on the six-port, the beam position can be determined by means of the phase difference between the received signals from both ends of the transmission line pickup. The six-port discriminator is a linear passive component, first developed in the 70s for accurate measurements of complex reflection coefficients in microwave network analysis. It typically consists of two hybrid couplers and two power dividers or one Wilkinson power divider and three -3dB hybrid couplers. For the measurement of the difference of two signals excited from a single source one of the hybrid coupler can be omitted. The advantage of the six port is the fact that accurate phase measurements can be performed at microwave and millimeter wave frequencies only by amplitude measurements. This paper shows the principle of operation, developed prototype, and first test results A. Penirschke et al., Proceedings of IBIC2013, Oxford, United Kingdom (2013). ** G.F. Engen, IEEE MTT, vol.25, no.12, pp.1077-1079, December 1977.
	Slides WECYB1 [2.567 MB]
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WEPF02	A Toroid Based Bunch Charge Monitor System with Machine Protection Features for FLASH and XFEL	timing, diagnostics, controls, FPGA	521
	M. Werner, T. Lensch, J. Lund-Nielsen, Re. Neumann, D. Nölle, N. Wentowski DESY, Hamburg, Germany
	For the superconducting linear accelerators FLASH and XFEL, a new toroid based charge measurement system has been designed as a standard diagnostic tool. It is also a sensor for the bunch charge stabilization feedback and for machine protection. The system is based on MTCA.4 technology and will offer a high dynamic range and high sensitivity. The machine protection features will cover recognition of poor transmission between adjacent toroid sensors, bunch pattern consistency checks, and protection of the beam dumps. The concept, an overview of the algorithms, and the implementation will be described. A summary of first operation experience at FLASH will be presented.
	Poster WEPF02 [1.113 MB]
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WEPF06	A New Integrating Current Transformer for the LHC	instrumentation, proton, resonance, luminosity	540
	L. Søby, D. Belohrad, M. Krupa, P. Odier CERN, Geneva, Switzerland J.F. Bergoz, F. Stulle BERGOZ Instrumentation, Saint Genis Pouilly, France
	The existing fast beam current transformers of the LHC have been shown to exhibit both bunch length and bunch position dependency. A new Integrating Current Transformer (ICT) have therefore been developed in collaboration with Bergoz Instrumentation to address these issues. As goals a 0.1 %/mm beam position dependency and 0.1 % bunch length dependency were specified, along with a bandwidth of 100 MHz. This paper describes the principles of ICT operation and presents the laboratory measurement results obtained with the first prototypes at CERN.
	Poster WEPF06 [2.286 MB]
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WEPD05	Improvement of Data Transfer Speed of Large Memory Monitors	Ethernet, EPICS, FPGA, injection	642
	M. Tobiyama KEK, Ibaraki, Japan
	Beam monitors with long memories will be widely used in SuperKEKB accelerators. Since the slow data transfer time of such devices usually limit the operational performance, improvement of the transfer rate is required. Two kind of devices, VME-based module and Ethernet-based modules has been developed. On the VME-based devices such as turn-by-turn position monitors for damping ring or long bunch oscillation monitors, MBLT and BLT transfer method has been implemented. For the Ethernet based system, the gated turn-by-turn monitors, SiTCP has been implemented on the FPGA and the EPICS device support for SiTCP has been developed. The improvement of the data transfer speed with the long-term reliability will be presented.
	Poster WEPD05 [1.791 MB]
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WEPD07	Evaluation of Libera Single Pass H for ESS LINAC	linac, detector, instrumentation, controls	647
	M. Cargnelutti, M. Žnidarčič I-Tech, Solkan, Slovenia H. Hassanzadegan ESS, Lund, Sweden
	The Beam Position Monitor system of the ESS linac will include in total more than 140 BPM detectors of different sizes and types. The resolution and accuracy of the position measurement with the nominal 62.5 mA beam current and 2.86 ms pulse width need to be 20 ?m and 100 ?m respectively, and those of the phase measurement are 0.2 deg and 1 deg respectively. The BPM system also needs to work successfully under off-optimal conditions, ex. with a de-bunched beam, or with the current and pulse width being as low as 6 mA and 10 ?s respectively. Options for the implementation of the ESS BPM electronics include: 1) a custom or commercial front-end card combined with a commercial digitizer with in-house developed firmware and 2) a fully commercial off the shelf system. Libera Single Pass H is an instrument intended for phase, position and charge monitoring in hadron and heavy ion LINACs. The instrument was tested at the ESS laboratory, to probe the feasibility of operation with ESS beam conditions. To give a realistic picture of the device performance, different testing setups were evaluated, including all the signal and environment conditions foreseen for the final ESS linac operation. The results present resolution, precision and accuracy evaluations, as well as stressful long-term and stability tests. This paper presents the achieved results of the Libera Single Pass H for the ESS beam parameters.
	Poster WEPD07 [4.257 MB]
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Paper

Title

Other Keywords

Page

MOPF22

Simultaneous Operation of Two FEL Undulator Beamlines at FLASH

undulator, laser, FEL, electron

103

S. Ackermann, V. Ayvazyan, B. Faatz, E. Hass, K. Klose, S. Pfeiffer, M. Scholz, S. Schreiber
DESY, Hamburg, Germany

The FLASH FEL User Facility at DESY (Hamburg) is driven by a Photocathode RF gun and superconducting RF structures, producing up to 800 electron bunches per train with a repetition rate of 10 Hz. Because not all user experiments need the full pulse train (8000 FEL pulses per second), part of the electron bunches can be deflected into a second beamline, which can simultaneously deliver FEL pulses with different parameters to a second user experiment. To realize this possibility, the FLASH facility has been upgraded with a second undulator line and a second experimental Hall. In this contribution, we will present the new layout of the FLASH facility and the first results to operate it with different parameter sets. We will show present results achieved during the commissioning of the new beamline. Finally, we will give an outlook of further commissioning plans and user operation.
S. Ackermann for the FLASH II Team

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MOPD17

Single-Shot Electro-Optical Diagnostics at the ANKA Storage Ring

laser, storage-ring, wakefield, electron

182

N. Hiller, A. Borysenko, E. Hertle, V. Judin, B. Kehrer, A.-S. Müller, M.J. Nasse, M. Schuh, P. Schönfeldt, N.J. Smale, J.L. Steinmann
KIT, Karlsruhe, Germany
P. Peier, B. Steffen
DESY, Hamburg, Germany
V. Schlott
PSI, Villigen PSI, Switzerland

Funding: This work is funded by the BMBF contract numbers: 05K10VKC, 05K13VKA.
ANKA is the first storage ring in the world with a near-field single-shot electro-optical (EO) bunch profile monitor. The method of electro-optical spectral decoding (EOSD) uses the Pockels effect to modulate the longitudinal electron bunch profile onto a long, chirped laser pulse passing through an EO crystal. The laser pulse is then analyzed with a single-shot spectrometer and from the spectral modulation, the temporal distribution can be extracted. The setup is tuned to a sub-ps resolution (granularity) and can measure down to bunch lengths of 1.5 ps RMS for bunch charges as low as 30 pC. With this setup it is possible to study longitudinal beam dynamics (e. g. microbunching) occurring during ANKA's low-alpha-operation, an operation mode with longitudinally compressed bunches to generate coherent synchrotron radiation in the THz range. In addition to measuring the longitudinal bunch profile, long-ranging wake-fields trailing the electron bunch can also be studied, hinting bunch-bunch interactions.

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MOPD25

Time Domain Pickup Signal characterization for Low Charge Arrival-Time Measurements at FLASH

pick-up, simulation, laser, electron

209

A. Angelovski, R. Jakoby, A. Penirschke
TU Darmstadt, Darmstadt, Germany
M.K. Czwalinna, H. Schlarb, C. Sydlo
DESY, Hamburg, Germany
T. Weiland
TEMF, TU Darmstadt, Darmstadt, Germany

For the low charge operation mode at the European XFEL, high bandwidth cone-shaped pickups were developed as a part of the Bunch Arrival-time Monitors (BAMs). The simulation showed that the signal parameters of interest, the signal slope and bandwidth are improved by more than a factor of six compared to the state of the art pickups. The pickups are installed at FLASH for verification. In this paper, time-domain measurements of the cone-shaped pickups at FLASH are presented. The pickup signal is recorded with a high bandwidth sampling oscilloscope. Two channel measurements are conducted with a single and a combined pickup signal in order to analyze the orbit and charge dependence of the pickup signal parameters. The measured time domain pickup signal wave form is compared to the CST PARTICLE STUDIO simulation.

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TUPF08

Design, Development and Commissioning of a MTCA-Based Button and Strip-Line BPM System for FLASH2

electronics, timing, undulator, electron

320

B. Lorbeer, N. Baboi, L.P. Petrosyan, F. Schmidt-Föhre
DESY, Hamburg, Germany

The FLASH (Free Electron Laser in Hamburg) facility at DESY (Deutsches Elektronen-Synchrotron) in Germany has been extended by a new undulator line called FLASH2 to provide twice as many experimental stations for users in the future*. After the acceleration of the electron bunch train up to 1.2GeV, a part can be kicked into FLASH2, while the other is going to the old undulator line. In order to tune the wavelength of the SASE (Self Amplified Spontaneous Emission), the new line is equipped with variable gap undulators. The commissioning phase of FLASH2 started in early 2014 and is planned to be continued parasitically during user operation in FLASH1. One key point during first beam commissioning is the availability of standard diagnostic devices such as BPM (Beam Position Monitor). In this paper we present the design and first operational experience of a new BPM system for button and strip-line monitors based on MTCA.4***. This is referred to as LCBPM (low charge BPM) in contrast to the old systems at FLASH initially designed for bunch charges of 1nC and higher. We summarize the recent analog and digital hardware development progress[**,****] and first commissioning experience of this new BPM system at FLASH2 and present a first estimation of its resolution in a large charge range from 1nC down to 100pC and smaller.
* flash2.desy.de
** B. Lorbeer et.al.,TUPA19, IBIC2012
*** MTCA.4 (Micro Telecommunications Computing Architecture ) for physics
**** Frank Schmidt-Foehre et.al.,IPAC2014 Dresden

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TUPF11

Mechanical Design of Cryogenic Vacuum Feedthroughs for X-FEL Button BPMs

cryogenics, simulation, vacuum, project-management

332

S. Vilcins, D. Lipka
DESY, Hamburg, Germany

The European XFEL is a 4th generation synchrotron radiation source, currently under construction in Hamburg. Based on different Free-Electron Laser and spontaneous sources and driven by a superconducting accelerator, it will be able to provide several user stations with photons simultaneously. Due to the superconducting technology in the accelerators modules many components have to operate at liquid helium temperature. This poster will concentrate on high frequency ultra high vacuum feedthrough used for the beam position monitors of the cryogenic accelerator modules. Main emphasis will be put on the design of these feedthroughs, their material composition and the production process. The capability to be used under these very special conditions was investigated with FEM simulations, as well as with a test procedure. The results of these simulations will be presented; the tests and their results will be explained in detail.

Poster TUPF11 [0.407 MB]

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TUPF14

Newly Developed 6mm Buttons for the BPMs in the ESRF Low-Emittance-Ring

coupling, factory, simulation, vacuum

346

K.B. Scheidt
ESRF, Grenoble, France

For the small beam pipe of the BPMs in the LE-ring a development of 6mm button-UHV-feedthroughs was launched and has resulted in the delivery of a total of 27 prototypes from both the Kyocera and the PMB-ALCEN companies. These buttons are flat, without skirt, with a central pin of Molybdenum ending in a male SMA connector. Among these prototype units are versions with Copper, Steel and Molybdenum material for the button itself, with the aim of assessing possible different heatload issues. All design considerations, that are compatible with a further button reduction to 4mm, will be presented next to issues of costs, mechanical tolerances and feasibility.

Poster TUPF14 [1.420 MB]

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TUPF27

Optical System for ESS Target Protection

proton, target, FPGA, radiation

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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TUPD05

Optimization of Beam Induced Fluorescence Monitors for Profile Measurements of High Current Heavy Ion Beams at GSI

detector, ion, background, experiment

412

C. Andre, P. Forck, R. Haseitl, A. Reiter, R. Singh, B. Walasek-Höhne
GSI, Darmstadt, Germany

To cope with the demands of the Facility for Antiproton and Ion Research (FAIR) for high current operation at the GSI Heavy Ion Linear Accelerator UNILAC non intercepting methods for transverse beam profile measurement are required. In addition to intercepting diagnostics like Secondary Electron Emission Grid (SEM-Grid) or scintillating screens, the Beam Induced Fluorescence (BIF) Monitor, an optical measurement device based on the observation of fluorescent light emitted by excited nitrogen molecules, was brought to routine operation. Starting with the first installations in 2008 and consequent improvements, successively six monitors were set up in the UNILAC and in the transfer line (TK) towards the synchrotron SIS18. BIF is used as a standard diagnostic tool to observe the ion beam at kinetic energies between 1.4 and 11.4 MeV/u. Beside the standard operation mode where the gas pressure is varied, further detailed investigations were conducted. The BIF setups were tested with various beam parameters. Different settings of camera, optics and image intensification were applied to improve the image quality for data analysis. In parallel, the light yield from different setups was compared for various ions, charge states, beam energies and particle numbers.

Poster TUPD05 [0.639 MB]

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TUPD06

CUPID: New System for Scintillating Screen Based Diagnostics

radiation, controls, GUI, 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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TUPD13

Experience with and Studies of the SNS Target Imaging System

target, neutron, simulation, proton

447

W. Blokland
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725
The Target Imaging System (TIS) shows the size and position of the proton beam by using a luminescent Cr:Al2O3 coating on the SNS target. The proton beam hitting the coating creates light which is transferred through mirrors and optical fibers to a digital camera outside the high radiation area. The TIS is used during operations to verify that the beam is in the right location and does not exceed the maximum proton beam peak density. This paper describes our operational experience with the TIS and the results of studies on the linearity, uniformity, and luminescence decay of the coating. In the future, tubes with material samples might be placed in front of the target for irradiation studies. The simulations of placing tubes in the front of target coating and its effect on the beam width and position measurements are also discussed.

Poster TUPD13 [3.216 MB]

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TUPD23

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

beam-losses, radiation, real-time, 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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WECYB1

Development of a Modified Six-Port Discriminator for Precise Beam Position Measurements

pick-up, simulation, detector, electronics

495

A. Penirschke, A. Angelovski, M. Hansli, R. Jakoby, T. Mahn
TU Darmstadt, Darmstadt, Germany

For the European XFEL, new energy beam position monitors based on planar transmission lines were designed for energy measurements in the dispersive section of bunch compressor chicanes. The EBPM consists of transversely mounted stripline pickups in a rectangular beam pipe section and a signal detection scheme which measures the phases of the pulses at the ends of the pickup*. It allows simultaneous measurements of the beam energy and arrival-time. This paper presents the development of a RF readout electronic based on a modified six-port discriminator as a low-cost alternative to the readout electronics based on the MTCA.4 platform for the EBPM. Based on the six-port, the beam position can be determined by means of the phase difference between the received signals from both ends of the transmission line pickup. The six-port discriminator is a linear passive component, first developed in the 70s for accurate measurements of complex reflection coefficients in microwave network analysis**. It typically consists of two hybrid couplers and two power dividers or one Wilkinson power divider and three -3dB hybrid couplers. For the measurement of the difference of two signals excited from a single source one of the hybrid coupler can be omitted. The advantage of the six port is the fact that accurate phase measurements can be performed at microwave and millimeter wave frequencies only by amplitude measurements. This paper shows the principle of operation, developed prototype, and first test results
* A. Penirschke et al., Proceedings of IBIC2013, Oxford, United Kingdom (2013).
** G.F. Engen, IEEE MTT, vol.25, no.12, pp.1077-1079, December 1977.

Slides WECYB1 [2.567 MB]

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WEPF02

A Toroid Based Bunch Charge Monitor System with Machine Protection Features for FLASH and XFEL

timing, diagnostics, controls, FPGA

521

M. Werner, T. Lensch, J. Lund-Nielsen, Re. Neumann, D. Nölle, N. Wentowski
DESY, Hamburg, Germany

For the superconducting linear accelerators FLASH and XFEL, a new toroid based charge measurement system has been designed as a standard diagnostic tool. It is also a sensor for the bunch charge stabilization feedback and for machine protection. The system is based on MTCA.4 technology and will offer a high dynamic range and high sensitivity. The machine protection features will cover recognition of poor transmission between adjacent toroid sensors, bunch pattern consistency checks, and protection of the beam dumps. The concept, an overview of the algorithms, and the implementation will be described. A summary of first operation experience at FLASH will be presented.

Poster WEPF02 [1.113 MB]

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WEPF06

A New Integrating Current Transformer for the LHC

instrumentation, proton, resonance, luminosity

540

L. Søby, D. Belohrad, M. Krupa, P. Odier
CERN, Geneva, Switzerland
J.F. Bergoz, F. Stulle
BERGOZ Instrumentation, Saint Genis Pouilly, France

The existing fast beam current transformers of the LHC have been shown to exhibit both bunch length and bunch position dependency. A new Integrating Current Transformer (ICT) have therefore been developed in collaboration with Bergoz Instrumentation to address these issues. As goals a 0.1 %/mm beam position dependency and 0.1 % bunch length dependency were specified, along with a bandwidth of 100 MHz. This paper describes the principles of ICT operation and presents the laboratory measurement results obtained with the first prototypes at CERN.

Poster WEPF06 [2.286 MB]

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WEPD05

Improvement of Data Transfer Speed of Large Memory Monitors

Ethernet, EPICS, FPGA, injection

642

M. Tobiyama
KEK, Ibaraki, Japan

Beam monitors with long memories will be widely used in SuperKEKB accelerators. Since the slow data transfer time of such devices usually limit the operational performance, improvement of the transfer rate is required. Two kind of devices, VME-based module and Ethernet-based modules has been developed. On the VME-based devices such as turn-by-turn position monitors for damping ring or long bunch oscillation monitors, MBLT and BLT transfer method has been implemented. For the Ethernet based system, the gated turn-by-turn monitors, SiTCP has been implemented on the FPGA and the EPICS device support for SiTCP has been developed. The improvement of the data transfer speed with the long-term reliability will be presented.

Poster WEPD05 [1.791 MB]

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WEPD07

Evaluation of Libera Single Pass H for ESS LINAC

linac, detector, instrumentation, controls

647

M. Cargnelutti, M. Žnidarčič
I-Tech, Solkan, Slovenia
H. Hassanzadegan
ESS, Lund, Sweden

The Beam Position Monitor system of the ESS linac will include in total more than 140 BPM detectors of different sizes and types. The resolution and accuracy of the position measurement with the nominal 62.5 mA beam current and 2.86 ms pulse width need to be 20 ?m and 100 ?m respectively, and those of the phase measurement are 0.2 deg and 1 deg respectively. The BPM system also needs to work successfully under off-optimal conditions, ex. with a de-bunched beam, or with the current and pulse width being as low as 6 mA and 10 ?s respectively. Options for the implementation of the ESS BPM electronics include: 1) a custom or commercial front-end card combined with a commercial digitizer with in-house developed firmware and 2) a fully commercial off the shelf system. Libera Single Pass H is an instrument intended for phase, position and charge monitoring in hadron and heavy ion LINACs. The instrument was tested at the ESS laboratory, to probe the feasibility of operation with ESS beam conditions. To give a realistic picture of the device performance, different testing setups were evaluated, including all the signal and environment conditions foreseen for the final ESS linac operation. The results present resolution, precision and accuracy evaluations, as well as stressful long-term and stability tests. This paper presents the achieved results of the Libera Single Pass H for the ESS beam parameters.

Poster WEPD07 [4.257 MB]

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