IBIC2014 - List of Keywords (electronics)

Paper	Title	Other Keywords	Page
MOIZB1	NSLS2 Diagnostic Systems Commissioning and Measurements	storage-ring, diagnostics, booster, injection	16
	W.X. Cheng, B. Bacha, K. Ha, Y. Hu, M.A. Maggipinto, J. Mead, D. Padrazo, O. Singh, H. Xu BNL, Upton, Long Island, New York, USA
	As the newest and most advanced third generation light source, NSLS2 commissioning has started recently. A total of 50mA stored beam was achieved in the storage ring. Most of the diagnostic systems have been commissioned with beams and proved to be critical to the success of machine commissioning. This paper will present beam commissioning results of various diagnostic systems in the NSLS2 injector and storage ring, including profile monitors, current monitors, and position monitors. We will discuss some preliminary machine measurements as well, such as beam current and lifetime, tune, beam stability, filling pattern etc.
	Slides MOIZB1 [6.187 MB]
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MOPF03	NSLSII Photon Beam Position Monitor ElectronicsTesting and Results	detector, photon, controls, software	42
	A.J. Della Penna, M.A. Maggipinto, J. Mead, O. Singh, K. Vetter BNL, Upton, Long Island, New York, USA
	Simulated and real beam data has been taken using the new NSLSII Photon BPM electronics. The electrometer design can measure currents as low as 10’s of nanoamps and has an ability to measure a current as high as 300mA. The 4 channel design allows for internal calibration and has both a Negative and Positive bias ability. Preliminary bench testing results has shown excellent resolution.
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MOPF13	Wire Scanner Installation into the MicroTCA Environment for the European XFEL	detector, controls, interface, timing	73
	T. Lensch, A. Delfs, V. Gharibyan, I. Krouptchenkov, D. Nölle, M. Pelzer, H. Tiessen, M. Werner, K. Wittenburg DESY, Hamburg, Germany
	The European XFEL (E-XFEL) is a 4th generation synchrotron radiation source currently under construction in Hamburg. The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations []. For the transverse beam profile measurement in the high energy sections Wire Scanners are used as an essential part of the accelerator diagnostic system, providing the tool to measure small beam size in an almost nondestructive manner. The scanners will be operated in a fast mode, starting from a trigger the wire will be accelerated to 1 m/s and hitting about 100 bunches out of the long bunch train of E-XFEL within a single macropulse. Slow scans with single bunches are also possible. In the first stage 12 stations are planned to be equipped with Wire Scanners where each station consists of two motion units (horizontal and vertical plane). The new concept uses linear servo motors for the motion of the wires and a new mechanical design has been developed at DESY []. This paper describes the electronics developments for the motion part of these Wire Scanners and the integration into the MicroTCA environment. [] "XFEL Technical Design Report", DESY 2006-097, http://xfel.desy.de [**] "OVERVIEW ON E-XFEL STANDARD ELECTRON BEAM DIAGNOSTICS", D.Nölle, BIW 2010, Santa Fe
	Poster MOPF13 [1.760 MB]
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MOPD03	Performance and Upgrade of the Fast Beam Condition Monitor at CMS	luminosity, electron, background, laser	134
	M. Hempel, H.M. Henschel, O. Karacheban, W. Lange, J.L. Leonard, M. Penno DESY Zeuthen, Zeuthen, Germany K. Afanaciev NC PHEP BSU, Minsk, Belarus A.I. Bell DLS, Oxfordshire, United Kingdom P.R. Burtowy, A.E. Dabrowski, R. Loos, V. Ryjov, A.A. Zagozdzinska CERN, Geneva, Switzerland W. Lohmann BTU, Cottbus, Germany W. Lohmann, R. Walsh DESY, Hamburg, Germany B.L. Pollack NU, Evanston, Illinois, USA D. Przyborowski AGH, Cracow, Poland S. Schuwalow Uni HH, Hamburg, Germany D.P. Stickland PU, Princeton, New Jersey, USA
	The Fast Beam Condition Monitor BCM1F is a diamond based particle detector inside CMS. It is based on 8 single crystal CVD diamond sensors on both ends of the interaction point and is used for beam background and luminosity measurements. The system has been operated up to an integrated luminosity of 30fb-1, corresponding to a particle fluence of 8.78·10¹³ cm^-2 (24GeV proton equivalent). To maintain the performance at a bunch spacing of 25ns and at the enhanced luminosity after the LHC Long Shutdown LS1, an upgrade of BCM1F is necessary. The upgraded system features 24 single crystal diamond sensors with a two pad metallization, a very fast front-end ASIC built with 130nm CMOS technology and new back-end electronics. A prototype of the upgraded BCM1F components were studied in the 5GeV electron beam at DESY. Measurements were done on the signal shape as function of time, the collection efficiency as a function of voltage and position of the impact point on the sensor surface. The preliminary results of this testbeam will be presented. In addition, the status of the new upgraded BCM1F will be given.
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MOPD10	New Results Of FERMI FEL1 EOS Diagnostics With Full Optical Synchronization	laser, FEL, electron, diagnostics	165
	M. Veronese, E. Allaria, P. Cinquegrana, E. Ferrari, F. Rossi, P. Sigalotti, C. Spezzani Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy E. Ferrari Università degli Studi di Trieste, Trieste, Italy
	The Electro Optical Sampling diagnostics (EOS) of the FERMI FEL has been recently upgraded with a full optical synchronization of its dedicated femtosecond fiber laser to the ultra-stable optical pulsed timing system of FERMI. For this purpose a dual synchronization electronics has been developed and installed. It exploits a mixed error signal derived from both optical to electrical conversion and from a second harmonic generation based optical phase detection. For this second part a new optical setup including a cross correlator has been installed. The operation of the EOS has greatly benefited from the upgrade. The arrival time measurements have been compared with the ones from the bunch arrival monitor diagnostics (BAM) showing very good agreement. This new setup has also allowed to improve the bunch profile measurement. Some examples of measurement with ZnTe and GaP are presented. Finally, usability and operator friendliness of the new setup are also discussed.
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MOPD19	Bunch Arrival Time Monitor for PAL-XFEL	timing, pick-up, LLRF, cavity	191
	J.H. Hong, J.H. Han, H.-S. Kang, C. Kim, H. Yang PAL, Pohang, Kyungbuk, Republic of Korea
	The X-ray Free Electron Laser project in Pohang Accelerator Laboratory (PAL-XFEL) requires high stability of bunch arrival time, and measurement resolution better than a few femtoseconds. The pickups of the electron Bunch Arrival time Monitor (BAM) for PAL-XFEL have been developed and simulated. The BAM pickups are based on an S-band monopole cavity with two coupling loops. The prototype BAM has been fabricated and installed downstream of the accelerating column at the Injector Test Facility (ITF) for PAL-XFEL. In this paper we will present the recent measurement results on the beam test of the BAM as well as a proposed strategy for developing the BAM for PAL-XFEL.
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TUPF06	Commissioning of the Electronics for HOM-based Beam Diagnostics at the 3.9 GHz Accelerating Module at FLASH	HOM, cavity, alignment, dipole	311
	N. Baboi, O. Hensler, L. Shi, T. Wamsat DESY, Hamburg, Germany N. Eddy, B.J. Fellenz Fermilab, Batavia, Illinois, USA P. Zhang CERN, Geneva, Switzerland
	Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 312453. Transverse Higher Order Modes (HOM) excited by electron beams in the 3.9 GHz accelerating cavities at FLASH may damage the beam quality. They can be reduced by extracting their energy through special couplers and by aligning the beam in the cavity. Electronics has been designed at FNAL for monitoring some of the potentially most damaging HOMs. This may be used for beam centering and therefore reducing the HOM effects. Moreover, the signals can be potentially calibrated into beam offset, so that they could be used as beam position monitors (HOM-BPM). The specifications of the monitors have been defined during an extensive study on the 4-cavity accelerating module installed at FLASH. Signals around 5.44 GHz have been chosen for higher precision measurements. However these signals propagate into the entire 1.2 m long module. Therefore in addition modes at about 9 GHz were selected for localized measurements in each cavity. The electronics has been recently installed at FLASH. The commissioning results will be presented in this paper. Instabilities previously observed in a test electronics as well as the HOM-BPMs in 1.3 GHz cavities will also be investigated. This electronics will also serve as a prototype for the electronics developed for the 3.9 GHz cavities at the European XFEL. L. Shi et al., this Conference **T. Wamsat et al., this Conference
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TUPF07	FLASH Undulator BPM Commissioning and Beam Characterization Results	undulator, cavity, pick-up, controls	315
	D. Lipka, N. Baboi, D. Nölle, G. Petrosyan, S. Vilcins DESY, Hamburg, Germany R. Baldinger, R. Ditter, B. Keil, W. Koprek, R. Kramert, G. Marinkovic, M. Roggli, M. Stadler PSI, Villigen PSI, Switzerland
	Recently, the commissioning of FLASH2 has started, a new soft X-ray FEL undulator line at the DESY FLASH facility. In the FLASH2 undulator intersections, the beam positions are measured by 17 cavity beam position monitor (CBPM) pick-ups and electronics* developed for the European XFEL (E-XFEL). In addition four CBPMs are available at FLASH1 for test and development. The new CBPM system enables an unprecedented position and charge resolution at FLASH, thus allowing further analysis and optimization of the FLASH beam quality and overall accelerator performance. Results of first beam measurements as well as correlations with other FLASH diagnostics systems are reported. * M. Stadler et al., “Low-Q Cavity BPM Electronics for E-XFEL, FLASH-2 and SwissFEL”, this conference.
	Poster TUPF07 [1.112 MB]
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TUPF08	Design, Development and Commissioning of a MTCA-Based Button and Strip-Line BPM System for FLASH2	timing, operation, 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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TUPF09	Calibration of OLYMPUS/DORIS Beam Position Monitors	experiment, positron, target, electron	324
	U. Schneekloth, N. Görrissen, G. Kube, J. Neugebauer, Ru. Neumann, F. Schmidt-Föhre DESY, Hamburg, Germany
	The goal of the OLYMPUS experiment is a precise measurement of the ratio of the positron-proton and electron-proton elastic scattering cross sections in order to quantify the effect of two-photon exchange. The experiment was performed using intense beams of electrons and positrons stored in the DORIS ring at Deutsches Elektronen Synchrotron in Hamburg, impinging on an un-polarized, internal, hydrogen gas target. An essential ingredient of the experiment is a precise determination of the luminosity, which requires a precise knowledge of the beam position of both beam species. During DORIS operation cylindrical button beam position monitors, read out by two independent electronics systems, were mounted up- and downstream of the target chamber. After the end of operation, the readout systems were cross-calibrated. The BPMs were then calibrated using a test-stand, consisting of a wire scanner assembly. The beam was simulated by applying an RF signal to the wire. This paper describes the calibration principles and test setup, together with the results compared to the expected BPM response.
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TUPF10	Stability Study of the Higher Order Mode Beam Position Monitors at the Accelerating Cavities at FLASH	dipole, HOM, cavity, polarization	327
	L. Shi, N. Baboi DESY, Hamburg, Germany R.M. Jones UMAN, Manchester, United Kingdom
	When electron beams traverse an accelerating structure, higher order modes (HOMs) are excited. They can be used for beam diagnostic purposes. Both 1.3 GHz and 3.9 GHz superconducting accelerating cavities at FLASH linac, DESY, are equipped with electronics for beam position monitoring, which are based on HOM signals from special couplers. These monitors provide the beam position without additional vacuum components and at low cost. Moreover, they can be used to align the beam in the cavities to reduce the HOM effects on the beam. However, the HOMBPM (Higher Order Mode based Beam Position Monitor) shows an instability problem over time. In this paper, we will present the status of studies on this issue. Several methods are utilized to calibrate the HOMBPMs. These methods include DLR (Direct Linear Regression), and SVD (Singular Value Decomposition). We found that SVD generally is more suitable for HOMBPM calibration. We focus on the HOMBPMs at 1.3 GHz cavities. Techniques developed here are applicable to 3.9 GHz modules. The work will pave the way for HOMBPMs of the E-XFEL (European X-Ray Free Electron Laser).
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TUPF12	First Tests of a Micro-TCA-Based Downconverter Electronic for 5GHz Higher Order Modes in Third Harmonic Accelerating Cavities at the XFEL	HOM, higher-order-mode, monitoring, cavity	337
	T. Wamsat, N. Baboi DESY, Hamburg, Germany
	Beam excited higher order modes (HOM) in 3.9GHz accelerating cavities at the European XFEL are planned to be used for beam position monitoring. The specifications of the monitors have been defined during an extensive study on the 3.9GHz module at FLASH. Selected HOMs for precision measurement are located around 5440MHz and 9040MHz. An electronics developed by FNAL has been recently installed at FLASH* and provides a basis for the XFEL electronics. The paper will present the design and first test of the hardware for the μTCA (Micro Telecommunications Computing Architecture) standard used for the XFEL. The hardware consists of three different Rear Transition Modules (RTM), two four channel downconverter RTMs (5GHz and 9GHz) and a third RTM with two phase locked loop synthesizers on board for LO generation. Presently the 5GHz and the PLL RTMs are under construction. The first measurements with these cards will be presented. N.Baboi, N.Eddy at al., this conference *N.Baboi, N.Eddy at al., this conference
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TUPF15	First Results with the Prototypes of New BPM Electronics for the Booster of the ESRF	booster, injection, Ethernet, storage-ring	351
	K.B. Scheidt ESRF, Grenoble, France
	The 25 year old BPM electronics of the ESRF’s Booster (200 MeV to 6 GeV, 300m, 75 BPM stations) are in process of replacement with new modern acquisition electronics. The design and development of this acquisition system was done in collaboration with the Instrumentation Technologies company and has resulted in a commercial product under the name Libera-Spark. It contains RF filtering & amplification electronics in front of 14 bit & 110 MHz ADCs for 4 channels, followed by a (Xilinx ZYNQ) System_on_Chip for all processing, that also includes the possibility of single bunch filtering directly on the ADC data. It is housed in a compact and robust module that is fully powered over the Ethernet connection and which facilitates its installation close to the BPM stations thereby avoiding long RF cabling. For simplicity and cost economic reasons this Spark is without PLL and adjustable RF attenuators since not needed for Booster BPM applications, but possible in elaborated versions for other applications. Two prototypes were fully tested with beam and results in terms of resolution & stability were assessed since delivery in January.
	Poster TUPF15 [4.855 MB]
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TUPD22	Beam Loss Monitor at SuperKEKB	ion, injection, positron, hardware	459
	H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, M. Tobiyama KEK, Ibaraki, Japan
	We will use beam loss monitors for protection of the hardware of SuperKEKB against the unexpected sudden beam loss. The sensors are ion chambers and PIN photo-diodes. The loss monitor system gives an important trigger for the beam abort system. We can optimize the threshold of the abort trigger by checking the beam information at each abort moment. This paper explains the overall system of the SuperKEKB beam loss monitors including the damping ring.
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WEIYB1	Direct (Under)Sampling vs Analog Downconversion for BPM Electronics	pick-up, cavity, detector, timing	486
	M. Wendt CERN, Geneva, Switzerland
	Digital signal processing by means of undersampling the analog signal has become a popular method for acquiring beam position monitor signals. This presentation discusses the technique and its principle limitations, presents today’s technical limits (e.g. in terms of performance of available ADCs), and provides an outlook for the future. It will also try to compare the technique with more tradition analog downmixing and signal processing methods.
	Slides WEIYB1 [3.957 MB]
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WECYB1	Development of a Modified Six-Port Discriminator for Precise Beam Position Measurements	pick-up, operation, simulation, detector	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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WECYB2	NSLS-II RF Beam Position Monitor Comissioning Update	timing, storage-ring, booster, diagnostics	500
	J. Mead, A. Caracappa, W.X. Cheng, C. Danneil, J.H. De Long, A.J. Della Penna, K. Ha, B.N. Kosciuk, M.A. Maggipinto, D. Padrazo, B. Podobedov, O. Singh, Y. Tian, K. Vetter BNL, Upton, Long Island, New York, USA
	The National Synchrotron Light Source II (NSLS-II) is a third generation light source currently in the commissioning stage at Brookhaven National Laboratory. The project includes a highly optimized, ultra-low emittance, 3GeV electron storage ring, linac pre-injector and full energy booster synchrotron. Successful commissioning of the booster began in November 2012, followed by the ongoing commissioning of the NSLS-II 3GeV electron storage ring which began in March 2014. With those particles first injected, came a value realization of the in-house developed RF Beam Position Monitor (RF BPM). This in-house design knowledge proved to be extremely valuable to match BPM configurations and requirements quickly when needed with various injected beam conditions. The RF BPM system was envisioned and undertaken to meet or exceed the demanding applications of a third generation light source. This internal R&D project has since matured to become a fully realized diagnostic system with over 250 modules currently operational. Initial BPM performance and applications will be discussed.
	Slides WECYB2 [3.041 MB]
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WECYB3	Status of the Sirius RF BPM Electronics	hardware, FPGA, storage-ring, feedback	505
	S.R. Marques, R.A. Baron, G.B.M. Bruno, F.H. Cardoso, L.A. Martins, J.L.B. Neto, L.M. Russo, D.O. Tavares LNLS, Campinas, Brazil
	A modular and open-source RF BPM electronics based on the PICMG(R) MicroTCA.4 and ANSI/VITA 57.1 FMC standards has been developed to be used at Sirius, a 3 GeV low emittance synchrotron light source under construction in Brazil. This paper reports on the latest development advances focusing on bench tests of the second version of the RF front-end and evaluation of the electronics with beam at SPEAR3 (SSRL/SLAC). The interface of the BPM electronics with the orbit feedback system is also discussed.
	Slides WECYB3 [3.265 MB]
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WECZB1	A SQUID-Based Beam Current Monitor for FAIR/CRYRING	pick-up, cryogenics, niobium, ion	510
	R. Geithner, T. Stöhlker IOQ, Jena, Germany R. Geithner, T. Stöhlker HIJ, Jena, Germany F. Kurian, H. Reeg, M. Schwickert, T. Stöhlker GSI, Darmstadt, Germany R. Neubert, P. Seidel FSU Jena, Jena, Germany
	A SQUID-based beam current monitor was developed for the upcoming FAIR-Project, providing a non-destructive online monitoring of the beam currents in the nA-range. The Cryogenic Current Comparator (CCC) was optimized for a lowest possible noise-limited current resolution together with a high system bandwidth. This CCC should be installed in the CRYRING facility, working as a test bench for FAIR. In this contribution we present results of the completed CCC for FAIR/CRYRING and also arrangements that have been done for the installation of the CCC at CRYRING, regarding the cryostat design.
	Slides WECZB1 [6.109 MB]
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WEPF15	Status of the Standard Diagnostic Systems of the European XFEL	diagnostics, cavity, undulator, gun	569
	D. Nölle DESY, Hamburg, Germany
	The European XFEL, an X-ray free-electron-laser user facility based on a 17.5 GeV superconducting LINAC, is currently under construction close to the DESY site at Hamburg. DESY is in charge of the construction of the accelerator. This contribution will report the status of the standard diagnostic systems of this facility. The design phase has finished for all main systems; most of the components are in production or are already produced. This paper will show details of the main systems, their installation issues and will report on the further time schedule. Furthermore, the experience from the commissioning of the RF gun with beam will be reported.
	Poster WEPF15 [5.427 MB]
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WEPD11	Beam-Based Calibration and Performance Optimization of Cavity BPMs for SwissFEL, E-XFEL and FLASH2	pick-up, undulator, FPGA, alignment	665
	B. Keil, G. Marinkovic, M. Stadler PSI, Villigen PSI, Switzerland D. Lipka DESY, Hamburg, Germany
	Funding: Part of this work was funded by the Swiss State Secretariat for Education, Research and Innovation (SERI). SwissFEL, the European XFEL (E-XFEL) and FLASH2 all use dual-resonator cavity beam position monitors (CBPMs). The CBPM electronics that is built by PSI has a larger number of calibration parameters that need to be determined in order to maximize the CBPM system performance. Beam measurements with the BPM electronics have been made in BPM test areas at the SwissFEL test injector and FLASH, as well as at FLASH2 where 17 E-XFEL type CBPMs have recently been installed in the undulator intersections [,]. The CBPMs are pre-calibrated in the lab using an automated test and calibration system [], and then the final calibration is done with beam. This report discusses beam-based methods to optimize the system performance by improving the pre-beam system calibration as well as the mechanical alignment of the pickup position and angle. D. Lipka et al., "FLASH Undulator BPM Commissioning and Beam Characterization Results", IBIC'14 ** M. Stadler et al., "Low-Q Cavity BPM Electronics for E-XFEL, FLASH-II and SwissFEL", IBIC'14
	Poster WEPD11 [0.445 MB]
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WEPD12	Low-Q Cavity BPM Electronics for E-XFEL, FLASH-II and SwissFEL	cavity, undulator, pick-up, controls	670
	M. Stadler, R. Baldinger, R. Ditter, B. Keil, F. Marcellini, G. Marinkovic, M. Roggli, M. Rohrer PSI, Villigen PSI, Switzerland D. Lipka, D. Nölle, S. Vilcins DESY, Hamburg, Germany
	PSI has developed BPM electronics for low-Q cavity BPMs that will be used in the E-XFEL and FLASH-II undulators, as well as in SwissFEL injector, linac and transfer lines. After beam tests at the SwissFEL test injector and FLASH, a pre-series of the electronics has been produced, tested and commissioned at FLASH-II [1]. The design, system features, signal processing techniques, lab-based test and calibration system as well as latest measurement results are reported.
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WEPD13	Development of the SwissFEL Undulator BPM System	pick-up, cavity, undulator, linac	675
	M. Stadler, R. Baldinger, R. Ditter, B. Keil, F. Marcellini, G. Marinkovic, M. Roggli, M. Rohrer PSI, Villigen PSI, Switzerland
	For SwissFEL, two types of cavity BPMs are used. In the linac, injector and transfer lines, low-Q dual-resonator cavity BPMs with a loaded Q (QL) of ~40 and 3.3GHz mode frequency allow easy separation of the two adjacent bunches with 28ns bunch spacing. For the undulators that receive only single bunches from a beam distribution kicker with 100Hz repetition rate, dual-resonator BPM pickups with higher QL are used. The baseline version for the undulator BPMs is a stainless steel pickup with QL=200 and 3.3GHz frequency. In addition, an alternative version with copper resonators, QL=1000 and 4.8GHz frequency has been investigated. For both pickups, prototypes were built and tested. The status of pickup and electronics development as well as the latest prototype test results are reported.
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WEPD17	Commissioning Results of MicroTCA.4 Stripline BPM System	synchrotron, linac, synchrotron-radiation, booster	680
	C. Xu, S. Allison, S. L. Hoobler, D.J. Martin, J.J. Olsen, T. Straumann, A. Young SLAC, Menlo Park, California, USA H.-S. Kang, C. Kim, S.J. Lee, G. Mun PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: Work supported by U.S. Department of Energy under Contract Numbers DE-AC02-06CH11357, DE-AC02-76SF00515, and WFOA13-197 SLAC National Accelerator Laboratory is a premier photon science laboratory. SLAC has a Free Electron Laser facility that will produce 0.5 to 77 Angstroms x-rays and a synchrotron light source facility. In order to achieve this high level of performance, the beam position measurement system needs to be accurate so the electron beam bunch can be stable. We have designed a general purpose stripline Beam Position Monitor (BPM) system that has a dynamic range of 10pC to 1nC bunch charge. The BPM system uses the MicroTCA (Micro Telecommunication Computing Architecture) for physics platform that consists of a 14-bit 250 MSPS ADC module (SIS8300 from Struck) that uses the Zone 3 A1.x classification for the Rear Transition Module (RTM). This paper will discuss the commissioning result at SLAC LCLS-I, SLAC SSRL, and Pohang Accelerator Laboratory. The RTM architecture includes a bandpass filter at 300MHz with 30 MHz bandwidth, and an automated BPM calibration process. The RTM communicates with the AMC FPGA using a QSPI interface over the zone 3 connection.
	Poster WEPD17 [5.087 MB]
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WEPD21	BPM Data Correction at SOLEIL	vacuum, storage-ring, simulation, synchrotron	684
	N. Hubert, B. Béranger, L.S. Nadolski SOLEIL, Gif-sur-Yvette, France
	In a synchrotron light source like SOLEIL, Beam Position Monitors (BPM) are optimized to have the highest sensitivity for an electron beam passing nearby their mechanical center. Nevertheless, this optimization is done to the detriment of the response linearity when the beam is off-centered for dedicated machine physic studies. To correct the geometric non linearity of the BPM, we have applied an algorithm based on a boundary element method. Moreover the BPM electronics is able to provide position data at a turn by turn rate. Unfortunately the filtering process in this electronics mixes the information from one turn to the neighboring turns. An additional demixing algorithm has been set-up to correct this artefact. The paper reports on performances and limitations of those two algorithms that are used at SOLEIL to correct the BPM data.
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THIXB1	Commissioning of the FLASH2 Electron Beam Diagnostics in Respect to its use at the European XFEL	diagnostics, undulator, electron, vacuum	712
	N. Baboi, D. Nölle DESY, Hamburg, Germany
	This report presents the first operation experience of the electron beam diagnostics at FLASH2. FLASH2 is a new undulator line at the FLASH linac at DESY. Most electron beam diagnostics installed, like the beam loss monitors, cavity beam position monitors, toroids, beam halo monitors, have been designed for the European XFEL, and will provide operational experience beforehand. A few systems, as for example the button beam position monitors and the ionization chambers, have been developed for FLASH. The controls use the new MTCA.4 standard. Both linacs, FLASH and the European XFEL, require similar performance of the diagnostics systems. Many beam parameters are similar: bunch charge of 0.1 to 1 nC, pulse repetition frequency of 10 Hz, while others will be more critical at the XFEL than the ones currently used at FLASH, like the bunch frequency of up to 4.5 MHz. versus 1 MHz. The commissioning of FLASH2 and its diagnostics is ongoing. The beam monitors have accompanied the first beam through the linac, fine tuning for some systems is still to be done. The achieved performance will be presented in view of their use at the European XFEL.
	Slides THIXB1 [3.875 MB]
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Paper

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MOIZB1

NSLS2 Diagnostic Systems Commissioning and Measurements

storage-ring, diagnostics, booster, injection

16

W.X. Cheng, B. Bacha, K. Ha, Y. Hu, M.A. Maggipinto, J. Mead, D. Padrazo, O. Singh, H. Xu
BNL, Upton, Long Island, New York, USA

As the newest and most advanced third generation light source, NSLS2 commissioning has started recently. A total of 50mA stored beam was achieved in the storage ring. Most of the diagnostic systems have been commissioned with beams and proved to be critical to the success of machine commissioning. This paper will present beam commissioning results of various diagnostic systems in the NSLS2 injector and storage ring, including profile monitors, current monitors, and position monitors. We will discuss some preliminary machine measurements as well, such as beam current and lifetime, tune, beam stability, filling pattern etc.

Slides MOIZB1 [6.187 MB]

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MOPF03

NSLSII Photon Beam Position Monitor ElectronicsTesting and Results

detector, photon, controls, software

42

A.J. Della Penna, M.A. Maggipinto, J. Mead, O. Singh, K. Vetter
BNL, Upton, Long Island, New York, USA

Simulated and real beam data has been taken using the new NSLSII Photon BPM electronics. The electrometer design can measure currents as low as 10’s of nanoamps and has an ability to measure a current as high as 300mA. The 4 channel design allows for internal calibration and has both a Negative and Positive bias ability. Preliminary bench testing results has shown excellent resolution.

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MOPF13

Wire Scanner Installation into the MicroTCA Environment for the European XFEL

detector, controls, interface, timing

73

T. Lensch, A. Delfs, V. Gharibyan, I. Krouptchenkov, D. Nölle, M. Pelzer, H. Tiessen, M. Werner, K. Wittenburg
DESY, Hamburg, Germany

The European XFEL (E-XFEL) is a 4th generation synchrotron radiation source currently under construction in Hamburg. The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations [*]. For the transverse beam profile measurement in the high energy sections Wire Scanners are used as an essential part of the accelerator diagnostic system, providing the tool to measure small beam size in an almost nondestructive manner. The scanners will be operated in a fast mode, starting from a trigger the wire will be accelerated to 1 m/s and hitting about 100 bunches out of the long bunch train of E-XFEL within a single macropulse. Slow scans with single bunches are also possible. In the first stage 12 stations are planned to be equipped with Wire Scanners where each station consists of two motion units (horizontal and vertical plane). The new concept uses linear servo motors for the motion of the wires and a new mechanical design has been developed at DESY [**]. This paper describes the electronics developments for the motion part of these Wire Scanners and the integration into the MicroTCA environment.
[*] "XFEL Technical Design Report", DESY 2006-097, http://xfel.desy.de
[**] "OVERVIEW ON E-XFEL STANDARD ELECTRON BEAM DIAGNOSTICS", D.Nölle, BIW 2010, Santa Fe

Poster MOPF13 [1.760 MB]

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MOPD03

Performance and Upgrade of the Fast Beam Condition Monitor at CMS

luminosity, electron, background, laser

134

M. Hempel, H.M. Henschel, O. Karacheban, W. Lange, J.L. Leonard, M. Penno
DESY Zeuthen, Zeuthen, Germany
K. Afanaciev
NC PHEP BSU, Minsk, Belarus
A.I. Bell
DLS, Oxfordshire, United Kingdom
P.R. Burtowy, A.E. Dabrowski, R. Loos, V. Ryjov, A.A. Zagozdzinska
CERN, Geneva, Switzerland
W. Lohmann
BTU, Cottbus, Germany
W. Lohmann, R. Walsh
DESY, Hamburg, Germany
B.L. Pollack
NU, Evanston, Illinois, USA
D. Przyborowski
AGH, Cracow, Poland
S. Schuwalow
Uni HH, Hamburg, Germany
D.P. Stickland
PU, Princeton, New Jersey, USA

The Fast Beam Condition Monitor BCM1F is a diamond based particle detector inside CMS. It is based on 8 single crystal CVD diamond sensors on both ends of the interaction point and is used for beam background and luminosity measurements. The system has been operated up to an integrated luminosity of 30fb-1, corresponding to a particle fluence of 8.78·10¹³ cm^-2 (24GeV proton equivalent). To maintain the performance at a bunch spacing of 25ns and at the enhanced luminosity after the LHC Long Shutdown LS1, an upgrade of BCM1F is necessary. The upgraded system features 24 single crystal diamond sensors with a two pad metallization, a very fast front-end ASIC built with 130nm CMOS technology and new back-end electronics. A prototype of the upgraded BCM1F components were studied in the 5GeV electron beam at DESY. Measurements were done on the signal shape as function of time, the collection efficiency as a function of voltage and position of the impact point on the sensor surface. The preliminary results of this testbeam will be presented. In addition, the status of the new upgraded BCM1F will be given.

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MOPD10

New Results Of FERMI FEL1 EOS Diagnostics With Full Optical Synchronization

laser, FEL, electron, diagnostics

165

M. Veronese, E. Allaria, P. Cinquegrana, E. Ferrari, F. Rossi, P. Sigalotti, C. Spezzani
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
E. Ferrari
Università degli Studi di Trieste, Trieste, Italy

The Electro Optical Sampling diagnostics (EOS) of the FERMI FEL has been recently upgraded with a full optical synchronization of its dedicated femtosecond fiber laser to the ultra-stable optical pulsed timing system of FERMI. For this purpose a dual synchronization electronics has been developed and installed. It exploits a mixed error signal derived from both optical to electrical conversion and from a second harmonic generation based optical phase detection. For this second part a new optical setup including a cross correlator has been installed. The operation of the EOS has greatly benefited from the upgrade. The arrival time measurements have been compared with the ones from the bunch arrival monitor diagnostics (BAM) showing very good agreement. This new setup has also allowed to improve the bunch profile measurement. Some examples of measurement with ZnTe and GaP are presented. Finally, usability and operator friendliness of the new setup are also discussed.

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MOPD19

Bunch Arrival Time Monitor for PAL-XFEL

timing, pick-up, LLRF, cavity

191

J.H. Hong, J.H. Han, H.-S. Kang, C. Kim, H. Yang
PAL, Pohang, Kyungbuk, Republic of Korea

The X-ray Free Electron Laser project in Pohang Accelerator Laboratory (PAL-XFEL) requires high stability of bunch arrival time, and measurement resolution better than a few femtoseconds. The pickups of the electron Bunch Arrival time Monitor (BAM) for PAL-XFEL have been developed and simulated. The BAM pickups are based on an S-band monopole cavity with two coupling loops. The prototype BAM has been fabricated and installed downstream of the accelerating column at the Injector Test Facility (ITF) for PAL-XFEL. In this paper we will present the recent measurement results on the beam test of the BAM as well as a proposed strategy for developing the BAM for PAL-XFEL.

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TUPF06

Commissioning of the Electronics for HOM-based Beam Diagnostics at the 3.9 GHz Accelerating Module at FLASH

HOM, cavity, alignment, dipole

311

N. Baboi, O. Hensler, L. Shi, T. Wamsat
DESY, Hamburg, Germany
N. Eddy, B.J. Fellenz
Fermilab, Batavia, Illinois, USA
P. Zhang
CERN, Geneva, Switzerland

Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 312453.
Transverse Higher Order Modes (HOM) excited by electron beams in the 3.9 GHz accelerating cavities at FLASH may damage the beam quality. They can be reduced by extracting their energy through special couplers and by aligning the beam in the cavity. Electronics has been designed at FNAL for monitoring some of the potentially most damaging HOMs. This may be used for beam centering and therefore reducing the HOM effects. Moreover, the signals can be potentially calibrated into beam offset, so that they could be used as beam position monitors (HOM-BPM). The specifications of the monitors have been defined during an extensive study on the 4-cavity accelerating module installed at FLASH. Signals around 5.44 GHz have been chosen for higher precision measurements. However these signals propagate into the entire 1.2 m long module. Therefore in addition modes at about 9 GHz were selected for localized measurements in each cavity. The electronics has been recently installed at FLASH. The commissioning results will be presented in this paper. Instabilities previously observed in a test electronics as well as the HOM-BPMs in 1.3 GHz cavities will also be investigated*. This electronics will also serve as a prototype for the electronics developed for the 3.9 GHz cavities at the European XFEL**.
*L. Shi et al., this Conference
**T. Wamsat et al., this Conference

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TUPF07

FLASH Undulator BPM Commissioning and Beam Characterization Results

undulator, cavity, pick-up, controls

315

D. Lipka, N. Baboi, D. Nölle, G. Petrosyan, S. Vilcins
DESY, Hamburg, Germany
R. Baldinger, R. Ditter, B. Keil, W. Koprek, R. Kramert, G. Marinkovic, M. Roggli, M. Stadler
PSI, Villigen PSI, Switzerland

Recently, the commissioning of FLASH2 has started, a new soft X-ray FEL undulator line at the DESY FLASH facility. In the FLASH2 undulator intersections, the beam positions are measured by 17 cavity beam position monitor (CBPM) pick-ups and electronics* developed for the European XFEL (E-XFEL). In addition four CBPMs are available at FLASH1 for test and development. The new CBPM system enables an unprecedented position and charge resolution at FLASH, thus allowing further analysis and optimization of the FLASH beam quality and overall accelerator performance. Results of first beam measurements as well as correlations with other FLASH diagnostics systems are reported.
* M. Stadler et al., “Low-Q Cavity BPM Electronics for E-XFEL, FLASH-2 and SwissFEL”, this conference.

Poster TUPF07 [1.112 MB]

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TUPF08

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

timing, operation, 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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TUPF09

Calibration of OLYMPUS/DORIS Beam Position Monitors

experiment, positron, target, electron

324

U. Schneekloth, N. Görrissen, G. Kube, J. Neugebauer, Ru. Neumann, F. Schmidt-Föhre
DESY, Hamburg, Germany

The goal of the OLYMPUS experiment is a precise measurement of the ratio of the positron-proton and electron-proton elastic scattering cross sections in order to quantify the effect of two-photon exchange. The experiment was performed using intense beams of electrons and positrons stored in the DORIS ring at Deutsches Elektronen Synchrotron in Hamburg, impinging on an un-polarized, internal, hydrogen gas target. An essential ingredient of the experiment is a precise determination of the luminosity, which requires a precise knowledge of the beam position of both beam species. During DORIS operation cylindrical button beam position monitors, read out by two independent electronics systems, were mounted up- and downstream of the target chamber. After the end of operation, the readout systems were cross-calibrated. The BPMs were then calibrated using a test-stand, consisting of a wire scanner assembly. The beam was simulated by applying an RF signal to the wire. This paper describes the calibration principles and test setup, together with the results compared to the expected BPM response.

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TUPF10

Stability Study of the Higher Order Mode Beam Position Monitors at the Accelerating Cavities at FLASH

dipole, HOM, cavity, polarization

327

L. Shi, N. Baboi
DESY, Hamburg, Germany
R.M. Jones
UMAN, Manchester, United Kingdom

When electron beams traverse an accelerating structure, higher order modes (HOMs) are excited. They can be used for beam diagnostic purposes. Both 1.3 GHz and 3.9 GHz superconducting accelerating cavities at FLASH linac, DESY, are equipped with electronics for beam position monitoring, which are based on HOM signals from special couplers. These monitors provide the beam position without additional vacuum components and at low cost. Moreover, they can be used to align the beam in the cavities to reduce the HOM effects on the beam. However, the HOMBPM (Higher Order Mode based Beam Position Monitor) shows an instability problem over time. In this paper, we will present the status of studies on this issue. Several methods are utilized to calibrate the HOMBPMs. These methods include DLR (Direct Linear Regression), and SVD (Singular Value Decomposition). We found that SVD generally is more suitable for HOMBPM calibration. We focus on the HOMBPMs at 1.3 GHz cavities. Techniques developed here are applicable to 3.9 GHz modules. The work will pave the way for HOMBPMs of the E-XFEL (European X-Ray Free Electron Laser).

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TUPF12

First Tests of a Micro-TCA-Based Downconverter Electronic for 5GHz Higher Order Modes in Third Harmonic Accelerating Cavities at the XFEL

HOM, higher-order-mode, monitoring, cavity

337

T. Wamsat, N. Baboi
DESY, Hamburg, Germany

Beam excited higher order modes (HOM) in 3.9GHz accelerating cavities at the European XFEL are planned to be used for beam position monitoring. The specifications of the monitors have been defined during an extensive study on the 3.9GHz module at FLASH. Selected HOMs for precision measurement are located around 5440MHz and 9040MHz. An electronics developed by FNAL has been recently installed at FLASH* and provides a basis for the XFEL electronics. The paper will present the design and first test of the hardware for the μTCA (Micro Telecommunications Computing Architecture) standard used for the XFEL. The hardware consists of three different Rear Transition Modules (RTM), two four channel downconverter RTMs (5GHz and 9GHz) and a third RTM with two phase locked loop synthesizers on board for LO generation. Presently the 5GHz and the PLL RTMs are under construction. The first measurements with these cards will be presented. *N.Baboi, N.Eddy at al., this conference
**N.Baboi, N.Eddy at al., this conference

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TUPF15

First Results with the Prototypes of New BPM Electronics for the Booster of the ESRF

booster, injection, Ethernet, storage-ring

351

K.B. Scheidt
ESRF, Grenoble, France

The 25 year old BPM electronics of the ESRF’s Booster (200 MeV to 6 GeV, 300m, 75 BPM stations) are in process of replacement with new modern acquisition electronics. The design and development of this acquisition system was done in collaboration with the Instrumentation Technologies company and has resulted in a commercial product under the name Libera-Spark. It contains RF filtering & amplification electronics in front of 14 bit & 110 MHz ADCs for 4 channels, followed by a (Xilinx ZYNQ) System_on_Chip for all processing, that also includes the possibility of single bunch filtering directly on the ADC data. It is housed in a compact and robust module that is fully powered over the Ethernet connection and which facilitates its installation close to the BPM stations thereby avoiding long RF cabling. For simplicity and cost economic reasons this Spark is without PLL and adjustable RF attenuators since not needed for Booster BPM applications, but possible in elaborated versions for other applications. Two prototypes were fully tested with beam and results in terms of resolution & stability were assessed since delivery in January.

Poster TUPF15 [4.855 MB]

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TUPD22

Beam Loss Monitor at SuperKEKB

ion, injection, positron, hardware

459

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

We will use beam loss monitors for protection of the hardware of SuperKEKB against the unexpected sudden beam loss. The sensors are ion chambers and PIN photo-diodes. The loss monitor system gives an important trigger for the beam abort system. We can optimize the threshold of the abort trigger by checking the beam information at each abort moment. This paper explains the overall system of the SuperKEKB beam loss monitors including the damping ring.

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WEIYB1

Direct (Under)Sampling vs Analog Downconversion for BPM Electronics

pick-up, cavity, detector, timing

486

M. Wendt
CERN, Geneva, Switzerland

Digital signal processing by means of undersampling the analog signal has become a popular method for acquiring beam position monitor signals. This presentation discusses the technique and its principle limitations, presents today’s technical limits (e.g. in terms of performance of available ADCs), and provides an outlook for the future. It will also try to compare the technique with more tradition analog downmixing and signal processing methods.

Slides WEIYB1 [3.957 MB]

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WECYB1

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

pick-up, operation, simulation, detector

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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WECYB2

NSLS-II RF Beam Position Monitor Comissioning Update

timing, storage-ring, booster, diagnostics

500

J. Mead, A. Caracappa, W.X. Cheng, C. Danneil, J.H. De Long, A.J. Della Penna, K. Ha, B.N. Kosciuk, M.A. Maggipinto, D. Padrazo, B. Podobedov, O. Singh, Y. Tian, K. Vetter
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II (NSLS-II) is a third generation light source currently in the commissioning stage at Brookhaven National Laboratory. The project includes a highly optimized, ultra-low emittance, 3GeV electron storage ring, linac pre-injector and full energy booster synchrotron. Successful commissioning of the booster began in November 2012, followed by the ongoing commissioning of the NSLS-II 3GeV electron storage ring which began in March 2014. With those particles first injected, came a value realization of the in-house developed RF Beam Position Monitor (RF BPM). This in-house design knowledge proved to be extremely valuable to match BPM configurations and requirements quickly when needed with various injected beam conditions. The RF BPM system was envisioned and undertaken to meet or exceed the demanding applications of a third generation light source. This internal R&D project has since matured to become a fully realized diagnostic system with over 250 modules currently operational. Initial BPM performance and applications will be discussed.

Slides WECYB2 [3.041 MB]

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WECYB3

Status of the Sirius RF BPM Electronics

hardware, FPGA, storage-ring, feedback

505

S.R. Marques, R.A. Baron, G.B.M. Bruno, F.H. Cardoso, L.A. Martins, J.L.B. Neto, L.M. Russo, D.O. Tavares
LNLS, Campinas, Brazil

A modular and open-source RF BPM electronics based on the PICMG(R) MicroTCA.4 and ANSI/VITA 57.1 FMC standards has been developed to be used at Sirius, a 3 GeV low emittance synchrotron light source under construction in Brazil. This paper reports on the latest development advances focusing on bench tests of the second version of the RF front-end and evaluation of the electronics with beam at SPEAR3 (SSRL/SLAC). The interface of the BPM electronics with the orbit feedback system is also discussed.

Slides WECYB3 [3.265 MB]

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WECZB1

A SQUID-Based Beam Current Monitor for FAIR/CRYRING

pick-up, cryogenics, niobium, ion

510

R. Geithner, T. Stöhlker
IOQ, Jena, Germany
R. Geithner, T. Stöhlker
HIJ, Jena, Germany
F. Kurian, H. Reeg, M. Schwickert, T. Stöhlker
GSI, Darmstadt, Germany
R. Neubert, P. Seidel
FSU Jena, Jena, Germany

A SQUID-based beam current monitor was developed for the upcoming FAIR-Project, providing a non-destructive online monitoring of the beam currents in the nA-range. The Cryogenic Current Comparator (CCC) was optimized for a lowest possible noise-limited current resolution together with a high system bandwidth. This CCC should be installed in the CRYRING facility, working as a test bench for FAIR. In this contribution we present results of the completed CCC for FAIR/CRYRING and also arrangements that have been done for the installation of the CCC at CRYRING, regarding the cryostat design.

Slides WECZB1 [6.109 MB]

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WEPF15

Status of the Standard Diagnostic Systems of the European XFEL

diagnostics, cavity, undulator, gun

569

D. Nölle
DESY, Hamburg, Germany

The European XFEL, an X-ray free-electron-laser user facility based on a 17.5 GeV superconducting LINAC, is currently under construction close to the DESY site at Hamburg. DESY is in charge of the construction of the accelerator. This contribution will report the status of the standard diagnostic systems of this facility. The design phase has finished for all main systems; most of the components are in production or are already produced. This paper will show details of the main systems, their installation issues and will report on the further time schedule. Furthermore, the experience from the commissioning of the RF gun with beam will be reported.

Poster WEPF15 [5.427 MB]

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WEPD11

Beam-Based Calibration and Performance Optimization of Cavity BPMs for SwissFEL, E-XFEL and FLASH2

pick-up, undulator, FPGA, alignment

665

B. Keil, G. Marinkovic, M. Stadler
PSI, Villigen PSI, Switzerland
D. Lipka
DESY, Hamburg, Germany

Funding: Part of this work was funded by the Swiss State Secretariat for Education, Research and Innovation (SERI).
SwissFEL, the European XFEL (E-XFEL) and FLASH2 all use dual-resonator cavity beam position monitors (CBPMs). The CBPM electronics that is built by PSI has a larger number of calibration parameters that need to be determined in order to maximize the CBPM system performance. Beam measurements with the BPM electronics have been made in BPM test areas at the SwissFEL test injector and FLASH, as well as at FLASH2 where 17 E-XFEL type CBPMs have recently been installed in the undulator intersections [*,**]. The CBPMs are pre-calibrated in the lab using an automated test and calibration system [**], and then the final calibration is done with beam. This report discusses beam-based methods to optimize the system performance by improving the pre-beam system calibration as well as the mechanical alignment of the pickup position and angle.
* D. Lipka et al., "FLASH Undulator BPM Commissioning and Beam Characterization Results", IBIC'14
** M. Stadler et al., "Low-Q Cavity BPM Electronics for E-XFEL, FLASH-II and SwissFEL", IBIC'14

Poster WEPD11 [0.445 MB]

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WEPD12

Low-Q Cavity BPM Electronics for E-XFEL, FLASH-II and SwissFEL

cavity, undulator, pick-up, controls

670

M. Stadler, R. Baldinger, R. Ditter, B. Keil, F. Marcellini, G. Marinkovic, M. Roggli, M. Rohrer
PSI, Villigen PSI, Switzerland
D. Lipka, D. Nölle, S. Vilcins
DESY, Hamburg, Germany

PSI has developed BPM electronics for low-Q cavity BPMs that will be used in the E-XFEL and FLASH-II undulators, as well as in SwissFEL injector, linac and transfer lines. After beam tests at the SwissFEL test injector and FLASH, a pre-series of the electronics has been produced, tested and commissioned at FLASH-II [1]. The design, system features, signal processing techniques, lab-based test and calibration system as well as latest measurement results are reported.

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WEPD13

Development of the SwissFEL Undulator BPM System

pick-up, cavity, undulator, linac

675

M. Stadler, R. Baldinger, R. Ditter, B. Keil, F. Marcellini, G. Marinkovic, M. Roggli, M. Rohrer
PSI, Villigen PSI, Switzerland

For SwissFEL, two types of cavity BPMs are used. In the linac, injector and transfer lines, low-Q dual-resonator cavity BPMs with a loaded Q (QL) of ~40 and 3.3GHz mode frequency allow easy separation of the two adjacent bunches with 28ns bunch spacing. For the undulators that receive only single bunches from a beam distribution kicker with 100Hz repetition rate, dual-resonator BPM pickups with higher QL are used. The baseline version for the undulator BPMs is a stainless steel pickup with QL=200 and 3.3GHz frequency. In addition, an alternative version with copper resonators, QL=1000 and 4.8GHz frequency has been investigated. For both pickups, prototypes were built and tested. The status of pickup and electronics development as well as the latest prototype test results are reported.

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WEPD17

Commissioning Results of MicroTCA.4 Stripline BPM System

synchrotron, linac, synchrotron-radiation, booster

680

C. Xu, S. Allison, S. L. Hoobler, D.J. Martin, J.J. Olsen, T. Straumann, A. Young
SLAC, Menlo Park, California, USA
H.-S. Kang, C. Kim, S.J. Lee, G. Mun
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: Work supported by U.S. Department of Energy under Contract Numbers DE-AC02-06CH11357, DE-AC02-76SF00515, and WFOA13-197
SLAC National Accelerator Laboratory is a premier photon science laboratory. SLAC has a Free Electron Laser facility that will produce 0.5 to 77 Angstroms x-rays and a synchrotron light source facility. In order to achieve this high level of performance, the beam position measurement system needs to be accurate so the electron beam bunch can be stable. We have designed a general purpose stripline Beam Position Monitor (BPM) system that has a dynamic range of 10pC to 1nC bunch charge. The BPM system uses the MicroTCA (Micro Telecommunication Computing Architecture) for physics platform that consists of a 14-bit 250 MSPS ADC module (SIS8300 from Struck) that uses the Zone 3 A1.x classification for the Rear Transition Module (RTM). This paper will discuss the commissioning result at SLAC LCLS-I, SLAC SSRL, and Pohang Accelerator Laboratory. The RTM architecture includes a bandpass filter at 300MHz with 30 MHz bandwidth, and an automated BPM calibration process. The RTM communicates with the AMC FPGA using a QSPI interface over the zone 3 connection.

Poster WEPD17 [5.087 MB]

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WEPD21

BPM Data Correction at SOLEIL

vacuum, storage-ring, simulation, synchrotron

684

N. Hubert, B. Béranger, L.S. Nadolski
SOLEIL, Gif-sur-Yvette, France

In a synchrotron light source like SOLEIL, Beam Position Monitors (BPM) are optimized to have the highest sensitivity for an electron beam passing nearby their mechanical center. Nevertheless, this optimization is done to the detriment of the response linearity when the beam is off-centered for dedicated machine physic studies. To correct the geometric non linearity of the BPM, we have applied an algorithm based on a boundary element method. Moreover the BPM electronics is able to provide position data at a turn by turn rate. Unfortunately the filtering process in this electronics mixes the information from one turn to the neighboring turns. An additional demixing algorithm has been set-up to correct this artefact. The paper reports on performances and limitations of those two algorithms that are used at SOLEIL to correct the BPM data.

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THIXB1

Commissioning of the FLASH2 Electron Beam Diagnostics in Respect to its use at the European XFEL

diagnostics, undulator, electron, vacuum

712

N. Baboi, D. Nölle
DESY, Hamburg, Germany

This report presents the first operation experience of the electron beam diagnostics at FLASH2. FLASH2 is a new undulator line at the FLASH linac at DESY. Most electron beam diagnostics installed, like the beam loss monitors, cavity beam position monitors, toroids, beam halo monitors, have been designed for the European XFEL, and will provide operational experience beforehand. A few systems, as for example the button beam position monitors and the ionization chambers, have been developed for FLASH. The controls use the new MTCA.4 standard. Both linacs, FLASH and the European XFEL, require similar performance of the diagnostics systems. Many beam parameters are similar: bunch charge of 0.1 to 1 nC, pulse repetition frequency of 10 Hz, while others will be more critical at the XFEL than the ones currently used at FLASH, like the bunch frequency of up to 4.5 MHz. versus 1 MHz. The commissioning of FLASH2 and its diagnostics is ongoing. The beam monitors have accompanied the first beam through the linac, fine tuning for some systems is still to be done. The achieved performance will be presented in view of their use at the European XFEL.

Slides THIXB1 [3.875 MB]

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