IBIC2014 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
MOPF31	Overview of Beam Instrumentation Activities for SwissFEL	electron, radiation, vacuum, undulator	119
	R. Ischebeck, R. Abela, F. Ardana-Lamas, V.R. Arsov, R. Baldinger, H.-H. Braun, M. Calvi, R. Ditter, C. Erny, F. Frei, R. Ganter, I. Gorgisyan, C.P. Hauri, S. Hunziker, P.N. Juranic, B. Keil, W. Koprek, R. Kramert, D. Llorente Sancho, F. Löhl, F. Marcellini, G. Marinkovic, B. Monoszlai, G.L. Orlandi, C. Ozkan, L. Patthey, M. Pedrozzi, P. Pollet, M. Radovic, L. Rivkin, M. Roggli, M. Rohrer, V. Schlott, A.G. Stepanov, J. Stettler PSI, Villigen PSI, Switzerland F. Ardana-Lamas, I. Gorgisyan, C.P. Hauri, L. Rivkin EPFL, Lausanne, Switzerland P. Peier DESY, Hamburg, Germany
	SwissFEL will provide users with brilliant X-ray pulses in 2017. A comprehensive suite of diagnostics is needed for the initial commissioning, for changes to the operating point, and for feedbacks. The development of instrumentation for SwissFEL is well underway, and solutions have been identified for most diagnostics systems. I will present here an overview of the instrumentation for SwissFEL, and give details on some recent developments.
	Poster MOPF31 [4.418 MB]
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MOPD19	Bunch Arrival Time Monitor for PAL-XFEL	timing, LLRF, cavity, electronics	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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MOPD25	Time Domain Pickup Signal characterization for Low Charge Arrival-Time Measurements at FLASH	simulation, laser, operation, 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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TUPF03	Overview of the Geometrical Non-Linear Effects of Button BPMs and Methodology for Their Efficient Suppression	simulation, coupling, storage-ring, vacuum	298
	A.A. Nosych, U. Iriso, A. Olmos ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain M. Wendt CERN, Geneva, Switzerland
	This paper describes an overview of the geometric non-linear effects common to beam position monitors (BPMs) installed in the accelerators and a methodology to correct for these effects. A typical characteristic curve of a pick-up is linear within a limited range from the BPM origin. At larger offsets the non-linearity of the curve is more pronounced and gets worse if the button diameter is small with respect to the beam pipe diameter. The general real-time linearization methods usually utilize linear correction combined with a simplistic polynomial, which may lead to inaccuracies in their limited application. We have developed a more rigorous methodology to suppress the non-linear effects of the BPMs through electromagnetic (EM) simulations and 2D fitting approximations. The focus is mainly on standard button pick-ups for the electron (ALBA) and proton machines (LHC).
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TUPF04	Numerical Calculations for the FAIR Proton Linac BPMs	linac, simulation, proton, vacuum	303
	C.S. Simon CEA/DSM/IRFU, France M.H. Almalki, P. Forck, W. Kaufmann, T. Sieber GSI, Darmstadt, Germany V. Bellego CEA/IRFU, Gif-sur-Yvette, France
	Fourteen Beam Position Monitors (BPMs) will be installed along the FAIR Proton LINAC. These monitors will be used to determine the beam position, the relative beam current and the mean beam energy by time of flight (TOF). A capacitive button type pickup was chosen for its easy mechanical realization and for the short insertion length which is important for the four BPMs locations of the inter-tank sections between the CH-cavities. Depending on the location, the BPM design has to be optimized, taking into account an energy range from 3 MeV to 70 MeV, limited space for installation and a 30 mm or 50 mm beam pipe aperture. This paper reports wake field numerical simulations performed by the code CST PARTICLE STUDIO to design and characterize the BPMs. Time of response of monitors are presented and results of calculations for various pickup-geometries are discussed taking into account different beam velocities.
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TUPF07	FLASH Undulator BPM Commissioning and Beam Characterization Results	electronics, undulator, cavity, 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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TUPF16	FRIB Beam Position Monitor Pick-Up Design	linac, cryogenics, ion, cavity	355
	O. Yair, J.L. Crisp, G. Kiupel, S.M. Lidia, R.C. Webber FRIB, East Lansing, Michigan, USA
	Due to the different beam diameters and the inclusion of superconducting cavities, different Beam Position Monitor (BPM) types with welded buttons are to be used in the Facility for Rare Isotope Beams (FRIB). The varying BPM sizes include the following apertures: 40 mm, 50 mm, 100 mm, and 150 mm. The 40 mm BPMs include both warm and cold types where the cold BPMs are located in cryomodules next to SRF cavities. Steel-jacketed SiO2 coaxial cables with sealed SMA connectors have been selected as signal cables in the cryomodule insulating vacuum. These will connect to the BPM assembly at roughly 4 K temperature at one end and to the feedthrough flange in the vacuum vessel wall at 300 K at the other end. The 40 mm and 50 mm BPMs will include 20 mm custom-made buttons. The 100 mm and 150 mm aperture BPM buttons will be larger, anywhere from 30 mm to 40 mm. This paper will specify the mechanical and electrical design challenges and the resolutions associated with FRIB operations in the following areas: varying BPM conditions, changes in apertures, and variants in button sizes.
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WEIYB1	Direct (Under)Sampling vs Analog Downconversion for BPM Electronics	electronics, 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	operation, 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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WECZB1	A SQUID-Based Beam Current Monitor for FAIR/CRYRING	electronics, 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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WEPF04	A Cryogenic Current Comparator for the Low Energy Antiproton Facitities at CERN	coupling, cryogenics, feedback, antiproton	530
	M.F. Fernandes, J. Tan CERN, Geneva, Switzerland C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: Funded by the European Unions Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485. Several laboratories have shown the potential of using Superconducting QUantum Interference Device (SQUID) magnetometers together with superconductor magnetic shields to measure beam current intensities in the sub-micro-Ampere regime. CERN, in collaboration with GSI, Jena university and Helmholtz Institute Jena, is currently working on developing an improved version of such a current monitor for the Antiproton Decelerator (AD) and Extra Low ENergy Antiproton (ELENA) rings at CERN, aiming for better current resolution and overall system availability. This contribution will present the current design, including theoretical estimation of the current resolution; stability limits of SQUID systems and adaptation of the coupling circuit to the AD beam parameters; the analysis of thermal and mechanical cryostat modes.
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WEPF09	Introduction to the Test Result of Turbo-ICT in PAL-ITF	monitoring, laser, diagnostics, electron	553
	H. J. Choi, M.S. Chae, H.-S. Kang, S.J. Park PAL, Pohang, Kyungbuk, Republic of Korea
	Pohang Accelerator Laboratory (PAL) built a PAL-ITF (Injector Test Facility) at the end of 2012 to successfully complete PAL-XFEL (X-ray Free Electron Laser) in 2015. The PAL-ITF is equipped with various kinds of diagnostic equipment to produce high-quality electron bunches. The three main parameters that an injection testing facility should measure are charge, energy and emittance. Although ICT and Faraday Cup were installed to measure beam charge, the noise generated in a klystron modulator not only interrupted accurate measurement but prevented low charges under tens of pC from being measured. Due to the changes in the overall voltage level of ITF, integration of ICT measured value failed to maintain perfect accuracy in terms of methodology (measured value continuously changed by ± 5pC). Accordingly, to solve the noise problems and accurately measure the quantity of electron beam charge, Turbo-ICT was installed. This paper focuses on the processes and test result of electric bunch charge quantity measurements using Turbo-ICT.
	Poster WEPF09 [2.807 MB]
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WEPF29	Progress on the Beam Energy Monitor for the SPIRAL2 Accelerator.	controls, EPICS, interface, rfq	617
	W.LC. Le Coz, C. Jamet, G. Ledu, S. Loret, C. Potier de courcy, D.T. Touchard GANIL, Caen, France Y. Lussignol CEA/DSM/IRFU, France
	The first part of the SPIRAL2 project entered last year in the end of the construction phase at GANIL in France. The facility will be composed by an ion source, a deuteron/proton source, a RFQ and a superconducting linear accelerator. The driver is planned to accelerate high intensities, up to 5 mA and 40 MeV for the deuteron beams. A monitoring system was built to measure the beam energy on the BTI line (Bench of Intermediate Test) at the exit of the RFQ. As part of the MEBT commissioning, the beam energy will be measured on the BTI with an Epics monitoring application. At the exit of the LINAC, another system will have to measure and control the beam energy. The control consists in ensuring that the beam energy stays under a limit by taking account of the measurement uncertainty. The energy is measured by a method of time of flight; the signal is captured by non-intercepting capacitive pick-ups. This paper describes the BTI monitor interface and presents the system evolution following the design review.
	Poster WEPF29 [1.513 MB]
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WEPD01	Observations of the Quadrupolar Oscillations at GSI SIS-18	injection, quadrupole, space-charge, emittance	629
	R. Singh, P. Forck, P. Kowina GSI, Darmstadt, Germany M. Gąsior CERN, Geneva, Switzerland W.F.O. Müller, J.A. Tsemo Kamga, T. Weiland TEMF, TU Darmstadt, Darmstadt, Germany
	An asymmetric capacitive pick-up was installed at GSI SIS-18 for determination of the turn-by-turn beam quadrupole moment. The pick-up geometry is simulated to estimate its sensitivity towards the beam dipole and quadrupole moments. Turn-by-turn quadrupole moment measurement allows to calculate the frequency of beam-size oscillations. Recent beam measurements using this pick-up show clear indications of the beam-size oscillations induced by the injection mismatch. In this contribution, we present these measurements and discuss their relevance for the direct determination of the incoherent space charge tune shift.
	Poster WEPD01 [3.589 MB]
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WEPD03	Conceptual Design of Elliptical Cavity Beam Position Monitors for Heavy Ion Storage Rings	cavity, storage-ring, ion, impedance	634
	M.S. Sanjari, X. Chen, P. Hülsmann, Yu.A. Litvinov, F. Nolden, M. Steck, T. Stöhlker GSI, Darmstadt, Germany J. Piotrowski AGH University of Science and Technology, Kraków, Poland
	Funding: M.S.S. acknowledges partial support by the Alliance Program of the Helmholtz Association (HA216/EMMI). X.C. acknowledges funding by the European Commission (PITN-GA-2011-289485). Over 50 years in the history of accelerator physics, RF cavities have been used as beam position and intensity monitors. Their structure has been extensively discussed across numerous papers reporting their successful operation. The application of RF cavities as pick-ups has recently been extended to include radioactive ion beam (RIB) facilities and heavy ion storage rings. These pick-ups allow for very sensitive, accurate, and quick characterisation of ion beams and turn out to be indispensable tools in nuclear as well as atomic physics experiments. A notable example is the resonant pick-up in the ESR at GSI Darmstadt () where single ion detection was achieved for lifetime measurements of radioactive nuclides (). A similar cavity pick-up was installed in CSRe in IMP Lanzhou (*). In this work, we describe a novel conceptual approach that utilizes RF cavities with an elliptical geometry. While requiring a high precision determination of the position and intensity of particle beams, it has to cope with design restriction at heavy-ion storage rings such as large beam pipe apertures. The latter become inevitable at facilities aiming at storing large-emittance beams as, e.g., planned in the future Collector Ring (CR) of the FAIR project at GSI Darmstadt. Simulation results are accompanied by results achieved from bench-top measurements on model cavities. F. Nolden et. al., NIM A, v 659 No 1 pp 69–77 (2011) P. Kienle, F. Bosch et. al., Phys. Lett. B, v 726, 4–5, pp 638–645 (2013) * J. X. Wu et. al., NIM B, v 317, pp 623–628 (2013)
	Poster WEPD03 [1.967 MB]
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WEPD11	Beam-Based Calibration and Performance Optimization of Cavity BPMs for SwissFEL, E-XFEL and FLASH2	electronics, 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, electronics, undulator, 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	cavity, undulator, electronics, 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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WEPD25	Upgrade Development Progress for the CERN SPS High Bandwidth Transverse Feedback Demonstrator System	kicker, feedback, controls, timing	700
	J.E. Dusatko, J.M. Cesaratto, J.D. Fox, C.H. Rivetta SLAC, Menlo Park, California, USA S. De Santis LBNL, Berkeley, California, USA W. Höfle CERN, Geneva, Switzerland
	Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP) A high bandwidth feedback demonstrator system has been developed for proof of concept transverse intra-bunch closed loop feedback control studies at the CERN SPS. This system contains a beam pickup, analog front end receiver, signal processor, back end driver, power amplifiers and kicker structure. The main signal processing functions are performed digitally, using very fast (4GSa/s) data converters to bring the system signals into and out of the digital domain. The digital signal processing function is flexibly implemented in an FPGA allowing for maximum speed and reconfigurability for testing multiple control algorithms. The signal processor is a modular design consisting of commercial and custom components. This approach allowed for a rapidly-developed prototype to be delivered in a short time with limited resources. Initial beam studies at the SPS using the system prior to the CERN long shutdown one (LS1) have been very encouraging. We are planning several key upgrades to the system, including the signal processor. This paper describes these upgrades and reports on their progress.
	Poster WEPD25 [1.301 MB]
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Paper

Title

Other Keywords

Page

MOPF31

Overview of Beam Instrumentation Activities for SwissFEL

electron, radiation, vacuum, undulator

119

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

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

Poster MOPF31 [4.418 MB]

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MOPD19

Bunch Arrival Time Monitor for PAL-XFEL

timing, LLRF, cavity, electronics

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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MOPD25

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

simulation, laser, operation, 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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TUPF03

Overview of the Geometrical Non-Linear Effects of Button BPMs and Methodology for Their Efficient Suppression

simulation, coupling, storage-ring, vacuum

298

A.A. Nosych, U. Iriso, A. Olmos
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
M. Wendt
CERN, Geneva, Switzerland

This paper describes an overview of the geometric non-linear effects common to beam position monitors (BPMs) installed in the accelerators and a methodology to correct for these effects. A typical characteristic curve of a pick-up is linear within a limited range from the BPM origin. At larger offsets the non-linearity of the curve is more pronounced and gets worse if the button diameter is small with respect to the beam pipe diameter. The general real-time linearization methods usually utilize linear correction combined with a simplistic polynomial, which may lead to inaccuracies in their limited application. We have developed a more rigorous methodology to suppress the non-linear effects of the BPMs through electromagnetic (EM) simulations and 2D fitting approximations. The focus is mainly on standard button pick-ups for the electron (ALBA) and proton machines (LHC).

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TUPF04

Numerical Calculations for the FAIR Proton Linac BPMs

linac, simulation, proton, vacuum

303

C.S. Simon
CEA/DSM/IRFU, France
M.H. Almalki, P. Forck, W. Kaufmann, T. Sieber
GSI, Darmstadt, Germany
V. Bellego
CEA/IRFU, Gif-sur-Yvette, France

Fourteen Beam Position Monitors (BPMs) will be installed along the FAIR Proton LINAC. These monitors will be used to determine the beam position, the relative beam current and the mean beam energy by time of flight (TOF). A capacitive button type pickup was chosen for its easy mechanical realization and for the short insertion length which is important for the four BPMs locations of the inter-tank sections between the CH-cavities. Depending on the location, the BPM design has to be optimized, taking into account an energy range from 3 MeV to 70 MeV, limited space for installation and a 30 mm or 50 mm beam pipe aperture. This paper reports wake field numerical simulations performed by the code CST PARTICLE STUDIO to design and characterize the BPMs. Time of response of monitors are presented and results of calculations for various pickup-geometries are discussed taking into account different beam velocities.

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TUPF07

FLASH Undulator BPM Commissioning and Beam Characterization Results

electronics, undulator, cavity, 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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TUPF16

FRIB Beam Position Monitor Pick-Up Design

linac, cryogenics, ion, cavity

355

O. Yair, J.L. Crisp, G. Kiupel, S.M. Lidia, R.C. Webber
FRIB, East Lansing, Michigan, USA

Due to the different beam diameters and the inclusion of superconducting cavities, different Beam Position Monitor (BPM) types with welded buttons are to be used in the Facility for Rare Isotope Beams (FRIB). The varying BPM sizes include the following apertures: 40 mm, 50 mm, 100 mm, and 150 mm. The 40 mm BPMs include both warm and cold types where the cold BPMs are located in cryomodules next to SRF cavities. Steel-jacketed SiO2 coaxial cables with sealed SMA connectors have been selected as signal cables in the cryomodule insulating vacuum. These will connect to the BPM assembly at roughly 4 K temperature at one end and to the feedthrough flange in the vacuum vessel wall at 300 K at the other end. The 40 mm and 50 mm BPMs will include 20 mm custom-made buttons. The 100 mm and 150 mm aperture BPM buttons will be larger, anywhere from 30 mm to 40 mm. This paper will specify the mechanical and electrical design challenges and the resolutions associated with FRIB operations in the following areas: varying BPM conditions, changes in apertures, and variants in button sizes.

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WEIYB1

Direct (Under)Sampling vs Analog Downconversion for BPM Electronics

electronics, 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

operation, 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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WECZB1

A SQUID-Based Beam Current Monitor for FAIR/CRYRING

electronics, 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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WEPF04

A Cryogenic Current Comparator for the Low Energy Antiproton Facitities at CERN

coupling, cryogenics, feedback, antiproton

530

M.F. Fernandes, J. Tan
CERN, Geneva, Switzerland
C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: Funded by the European Unions Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485.
Several laboratories have shown the potential of using Superconducting QUantum Interference Device (SQUID) magnetometers together with superconductor magnetic shields to measure beam current intensities in the sub-micro-Ampere regime. CERN, in collaboration with GSI, Jena university and Helmholtz Institute Jena, is currently working on developing an improved version of such a current monitor for the Antiproton Decelerator (AD) and Extra Low ENergy Antiproton (ELENA) rings at CERN, aiming for better current resolution and overall system availability. This contribution will present the current design, including theoretical estimation of the current resolution; stability limits of SQUID systems and adaptation of the coupling circuit to the AD beam parameters; the analysis of thermal and mechanical cryostat modes.

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WEPF09

Introduction to the Test Result of Turbo-ICT in PAL-ITF

monitoring, laser, diagnostics, electron

553

H. J. Choi, M.S. Chae, H.-S. Kang, S.J. Park
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory (PAL) built a PAL-ITF (Injector Test Facility) at the end of 2012 to successfully complete PAL-XFEL (X-ray Free Electron Laser) in 2015. The PAL-ITF is equipped with various kinds of diagnostic equipment to produce high-quality electron bunches. The three main parameters that an injection testing facility should measure are charge, energy and emittance. Although ICT and Faraday Cup were installed to measure beam charge, the noise generated in a klystron modulator not only interrupted accurate measurement but prevented low charges under tens of pC from being measured. Due to the changes in the overall voltage level of ITF, integration of ICT measured value failed to maintain perfect accuracy in terms of methodology (measured value continuously changed by ± 5pC). Accordingly, to solve the noise problems and accurately measure the quantity of electron beam charge, Turbo-ICT was installed. This paper focuses on the processes and test result of electric bunch charge quantity measurements using Turbo-ICT.

Poster WEPF09 [2.807 MB]

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WEPF29

Progress on the Beam Energy Monitor for the SPIRAL2 Accelerator.

controls, EPICS, interface, rfq

617

W.LC. Le Coz, C. Jamet, G. Ledu, S. Loret, C. Potier de courcy, D.T. Touchard
GANIL, Caen, France
Y. Lussignol
CEA/DSM/IRFU, France

The first part of the SPIRAL2 project entered last year in the end of the construction phase at GANIL in France. The facility will be composed by an ion source, a deuteron/proton source, a RFQ and a superconducting linear accelerator. The driver is planned to accelerate high intensities, up to 5 mA and 40 MeV for the deuteron beams. A monitoring system was built to measure the beam energy on the BTI line (Bench of Intermediate Test) at the exit of the RFQ. As part of the MEBT commissioning, the beam energy will be measured on the BTI with an Epics monitoring application. At the exit of the LINAC, another system will have to measure and control the beam energy. The control consists in ensuring that the beam energy stays under a limit by taking account of the measurement uncertainty. The energy is measured by a method of time of flight; the signal is captured by non-intercepting capacitive pick-ups. This paper describes the BTI monitor interface and presents the system evolution following the design review.

Poster WEPF29 [1.513 MB]

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WEPD01

Observations of the Quadrupolar Oscillations at GSI SIS-18

injection, quadrupole, space-charge, emittance

629

R. Singh, P. Forck, P. Kowina
GSI, Darmstadt, Germany
M. Gąsior
CERN, Geneva, Switzerland
W.F.O. Müller, J.A. Tsemo Kamga, T. Weiland
TEMF, TU Darmstadt, Darmstadt, Germany

An asymmetric capacitive pick-up was installed at GSI SIS-18 for determination of the turn-by-turn beam quadrupole moment. The pick-up geometry is simulated to estimate its sensitivity towards the beam dipole and quadrupole moments. Turn-by-turn quadrupole moment measurement allows to calculate the frequency of beam-size oscillations. Recent beam measurements using this pick-up show clear indications of the beam-size oscillations induced by the injection mismatch. In this contribution, we present these measurements and discuss their relevance for the direct determination of the incoherent space charge tune shift.

Poster WEPD01 [3.589 MB]

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WEPD03

Conceptual Design of Elliptical Cavity Beam Position Monitors for Heavy Ion Storage Rings

cavity, storage-ring, ion, impedance

634

M.S. Sanjari, X. Chen, P. Hülsmann, Yu.A. Litvinov, F. Nolden, M. Steck, T. Stöhlker
GSI, Darmstadt, Germany
J. Piotrowski
AGH University of Science and Technology, Kraków, Poland

Funding: M.S.S. acknowledges partial support by the Alliance Program of the Helmholtz Association (HA216/EMMI). X.C. acknowledges funding by the European Commission (PITN-GA-2011-289485).
Over 50 years in the history of accelerator physics, RF cavities have been used as beam position and intensity monitors. Their structure has been extensively discussed across numerous papers reporting their successful operation. The application of RF cavities as pick-ups has recently been extended to include radioactive ion beam (RIB) facilities and heavy ion storage rings. These pick-ups allow for very sensitive, accurate, and quick characterisation of ion beams and turn out to be indispensable tools in nuclear as well as atomic physics experiments. A notable example is the resonant pick-up in the ESR at GSI Darmstadt (*) where single ion detection was achieved for lifetime measurements of radioactive nuclides (**). A similar cavity pick-up was installed in CSRe in IMP Lanzhou (***). In this work, we describe a novel conceptual approach that utilizes RF cavities with an elliptical geometry. While requiring a high precision determination of the position and intensity of particle beams, it has to cope with design restriction at heavy-ion storage rings such as large beam pipe apertures. The latter become inevitable at facilities aiming at storing large-emittance beams as, e.g., planned in the future Collector Ring (CR) of the FAIR project at GSI Darmstadt. Simulation results are accompanied by results achieved from bench-top measurements on model cavities.
* F. Nolden et. al., NIM A, v 659 No 1 pp 69–77 (2011)
** P. Kienle, F. Bosch et. al., Phys. Lett. B, v 726, 4–5, pp 638–645 (2013)
*** J. X. Wu et. al., NIM B, v 317, pp 623–628 (2013)

Poster WEPD03 [1.967 MB]

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WEPD11

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

electronics, 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, electronics, undulator, 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

cavity, undulator, electronics, 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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WEPD25

Upgrade Development Progress for the CERN SPS High Bandwidth Transverse Feedback Demonstrator System

kicker, feedback, controls, timing

700

J.E. Dusatko, J.M. Cesaratto, J.D. Fox, C.H. Rivetta
SLAC, Menlo Park, California, USA
S. De Santis
LBNL, Berkeley, California, USA
W. Höfle
CERN, Geneva, Switzerland

Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP)
A high bandwidth feedback demonstrator system has been developed for proof of concept transverse intra-bunch closed loop feedback control studies at the CERN SPS. This system contains a beam pickup, analog front end receiver, signal processor, back end driver, power amplifiers and kicker structure. The main signal processing functions are performed digitally, using very fast (4GSa/s) data converters to bring the system signals into and out of the digital domain. The digital signal processing function is flexibly implemented in an FPGA allowing for maximum speed and reconfigurability for testing multiple control algorithms. The signal processor is a modular design consisting of commercial and custom components. This approach allowed for a rapidly-developed prototype to be delivered in a short time with limited resources. Initial beam studies at the SPS using the system prior to the CERN long shutdown one (LS1) have been very encouraging. We are planning several key upgrades to the system, including the signal processor. This paper describes these upgrades and reports on their progress.

Poster WEPD25 [1.301 MB]

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