IBIC2016 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
MOPG08	Beam Position Monitors for LEReC	electron, electronics, ion, instrumentation	47
	Z. Sorrell, P. Cerniglia, R.L. Hulsart, K. Mernick, R.J. Michnoff BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LL C under Contract No. DE-AC02-98CH10886 with the U.S. Dept. of Energy The operating parameters for Brookhaven National Laboratory's Low Energy RHIC Electron Cooling (LEReC) project create a unique challenge. To ensure proper beam trajectories for cooling, the relative position between the electron and the ion beam needs to be known to within 50μm. In addition, time of flight needs to be provided for electron beam energy measurement. Various issues have become apparent as testing has progressed, such as mismatches in cable impedance and drifts due to temperature sensitivity. This paper will explore the difficulties related to achieving the level of accuracy required for this system, as well as the potential solutions for these problems.
	Poster MOPG08 [3.304 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG08
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MOPG15	BPM Electronics for the ELBE Linear Accelerator - a Comparison	electronics, controls, embedded, instrumentation	75
	U. Lehnert, A. Büchner, B. Lange, R. Schurig, R. Steinbrück HZDR, Dresden, Germany
	The ELBE linear accelerator supports a great variety of possible beam options ranging from single bunches to 1.6 mA CW beams at 13 MHz bunch repetition rate. Accordingly high are the dynamic range requirements for the BPM system. Recently, we are testing the Libera Spark EL electronics to supplement our home-built BPM electronics for low repetition rate operation. Here, we discuss the advantages and disadvantages of the two completely different detection schemes. For integration of the Libera Spark EL into our accelerator control system we are implementing an OPC-UA server embedded into the device. The server is based on the free Open62541 protocol stack which is available as open source under the LGPL.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG15
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TUPG01	Beam Based Calibration of a Rogowski Coil Used as a Horizontal and Vertical Beam Position Monitor	factory, storage-ring, dipole, synchrotron	302
	F. Trinkel, F. Hinder, D. Shergelashvili, H. Soltner FZJ, Jülich, Germany F. Hinder RWTH, Aachen, Germany
	Electric Dipole Moments (EDMs) violate parity and time reversal symmetries. Assuming the CPT-theorem, this leads to CP violation, which is needed to explain the matter over antimatter dominance in the Universe. So far no direct EDM measurement for charged hadrons have been performed. The goal of the JEDI collaboration (Jülich Electric Dipole moment Investigations) is to measure the EDM of charged particles. The measurement of EDMs of charged hadrons can be performed in storage rings by observing a polarization build-up proportional to the EDM. Due to the smallness of the effect many systematic effects leading to a fake build-up have to be studied. A first step on the way for an EDM measurement is the investigation of systematic errors at the storage ring COSY (COoler SYnchrotron). One part of these studies is the control of the beam orbit with high precession. Therefore a concept of new Beam Position Monitors (BPMs) based on magnetic pick-up coils are used. The main advantage of the coil design is the high response to bunched beam frequency signal and the compactness of the coil itself. First measurement results of such a BPM accelerator environment will be presented.
	Poster TUPG01 [1.827 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG01
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TUPG02	A Novel Electron-BPM Front End With Sub-Micron Resolution Based on Pilot-Tone Compensation: Test Results With Beam	FPGA, storage-ring, factory, electron	307
	G. Brajnik, S. Carrato University of Trieste, Trieste, Italy S. Bassanese, G. Cautero, R. De Monte Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	In this paper we present a novel and original four channel front-end developed for a beam position monitor (BPM) system. In this work, we demonstrate for the first time the continuous calibration of the system using a pilot tone for both beam current dependency and thermal drift compensation, eliminating the need for thermoregulation. By using this original approach, we were also able to investigate several odd and well-known behaviours of BPM systems; the influence of important issues, like the non-linearity of ADCs and the gain compression of amplifiers which do affect the reliability of the measurement, have been fully understood. To achieve these results, we developed a new radio frequency front-end that combines the four pick-up signals originated by the beam with a stable and programmable tone, generated within the readout system. The signals from a button BPM of Elettra storage ring, have been acquired with a 16 bit - 160MS/s digitizer controlled by a CPU that evaluates the acquired data and applies the correction factor of the pilot tone. A final resolution equal to 1.0um, on a 20mm average radius vacuum chamber, has been measured with a long-term stability less than 1um.
	Poster TUPG02 [3.671 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG02
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TUPG04	CERN PS Booster Transverse Damper: 10 kHz - 200 MHz Radiation Tolerant Amplifier for Capacitive PU Signal Conditioning	impedance, radiation, linac, electronics	315
	A. Meoli, A. Blas, R. Louwerse CERN, Geneva, Switzerland
	After connection to the LINAC4, the beam intensity in the PSBooster is expected to double and thus, an upgrade of the head electronics of the transverse feedback BPM is necessary. In order to cover the beam spectrum for an effective transverse damping, the pickup (PU) signal should have a large bandwidth on both the low and high frequency sides. Furthermore, in order to extend the natural low frequency cut-off from 6MHz (50' load) down to the required 10kHz, with no modification of the existing PUs, a high impedance signal treatment is required. The electronic parts should withstand the radiation dose received during at least a year of service. This constraint implies the installation of the amplifier at a remote location. A solution was found inspired by the technique of oscilloscopes' high impedance probes that mitigates the effect of transmission line mismatch using a lossy coaxial cable with an appropriate passive circuitry. A new large bandwidth, radiation tolerant amplifier has been designed. The system requirements, the analysis, the measurements with the present PUs, the design of the amplifier and the experimental results are described in this contribution.
	Poster TUPG04 [1.030 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG04
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TUPG05	Simulation of Bunch Length and Velocity Dependence of Button BPMs for Linacs Using CST Particle Studio®	simulation, linac, wakefield, proton	319
	M.H. Almalki KACST, Riyadh, Kingdom of Saudi Arabia P. Forck, T. Sieber, R. Singh GSI, Darmstadt, Germany
	At non-relativistic velocities at a proton LINAC, the electromagnetic field generated by the beam has a significant longitudinal component, and thus the time evolution of the signal coupled to the BPM electrodes depends on bunch length and beam velocity. Extensive simulations with the electromagnetic simulation tool CST Studio® were executed to investigate the dependence of the induced BPM signal on different bunch lengths and velocities. Related to the application, the simulations are executed for the button BPM arrangement as foreseen for the FAIR Proton LINAC. These investigations provide the required inputs for the BPM system and its related technical layout such as analogue bandwidth and signal processing electronics. For the BPM electronics, it is important to estimate the contribution of the harmonic used for the data processing. Additionally, the analogue bandwidth of the BPM system is determined from studying the output signal of the button BPM as a function of bunch length at different beam velocities. This contribution presents the results of the simulations and comments on general findings relevant for a BPM layout and the operation of a hadron LINAC.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG05
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TUPG07	Commisioning of Beam Position and Phase Monitors for LIPAc	coupling, simulation, vacuum, electronics	326
	I. Podadera, A. Guirao, D. Jiménez-Rey, L.M. Martínez, J. Mollá, A. Soleto, R. Varela CIEMAT, Madrid, Spain
	Funding: Work partially supported by the Spanish Ministry of Science and Innovation under project AIC-A-2011-0654 and FIS2013-40860-R The LIPAc accelerator will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF accelerator. Several types of Beam Position Monitors BPMs- are placed in each section of the accelerator to ensure a good beam transport and minimize beam losses. LIPAc is presently under installation and commissioning of the second acceleration stage at 5 MeV. In this stage two types of BPMs are used: four striplines to control the position at the Medium Energy Beam Transport line (MEBT), and three striplines to precisely measure the mean beam energy at the Diagnostics Plate. The seven pickups have been installed and assembled in the beamlines after characterization in a wire test bench, and are presently been commissioned in the facility. In addition, the in-house acquisition system has been fully developed and tested in the wire test bench at CIEMAT. In this contribution, the results of the beam position monitors characterization, the tests carried out during the assembly and the first measurements with the electronics system will be reported.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG07
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TUPG46	Improvements to the LHC Schottky Monitors	cavity, insertion, synchrotron, coupling	453
	M. Wendt, M. Betz, O.R. Jones, T. Lefèvre, T.E. Levens CERN, Geneva, Switzerland
	The LHC Schottky monitors have the potential to measure and monitor some important beam parameters, tune, momentum spread, chromaticity and emittance, in a non-invasive way. We present recent upgrade and improvement efforts of the transverse LHC Schottky systems operating at 4.8 GHz. This includes optimization of the slotted waveguide pickups and a re-design of the RF front-end electronics to detect the weak, incoherent Schottky signals in presence of large, coherent beam harmonics.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG46
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TUPG53	Bunch Arrival-Time Monitoring for Laser Particle Accelerators and Thomson Scattering X-Ray Sources	laser, electron, timing, detector	468
	J.M. Kraemer, M. Kuntzsch, U. Lehnert, P. Michel, U. Schramm HZDR, Dresden, Germany J.P. Couperus, A. Irman, A. Koehler, O. Zarini Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
	The ELBE center of high power radiation sources at Helmholtz-Zentrum Dresden-Rossendorf combines a superconducting CW linear accelerator with Terawatt- and Petawatt-level laser sources. Key experiments rely on precise timing and synchronization between the different radiation pulses. An online single shot monitoring system has been set up in order to measure the timing between the high-power Ti:Sa laser DRACO and electron bunches generated by the conventional SRF accelerator. This turnkey timing system is suitable for timing control of Thomson scattering X-ray sources and external injection of electron bunches into a laser wakefield accelerator. It uses a broadband RF pickup to acquire a probe of the particle bunch's electric field and modulates a fraction of the high power laser pulse in a fast electro-optical modulator. The amplitude modulation gives a direct measure for the timing between both beams. Using this setup a resolution of <200 fs RMS has been demonstrated. The contribution will show the prototype, first measurement results and will discuss future modification in order to improve the resolution of the system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG53
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WEPG01	Numerical Comparative Study of BPM Designs for the HESR at FAIR	simulation, emittance, monitoring, software	608
	A.J. Halama, C. Böhme, V. Kamerdzhiev, F. Klehr, S. Srinivasan FZJ, Jülich, Germany
	The institute of Nuclear Physics 4(IKP-4) of the Research Center Jülich (FZJ) is in charge of building and commissioning the High Energy Storage Ring (HESR) within the international Facility for Antiproton and Ion Research (FAIR) at Darmstadt. Simulations and numerical calculations were performed to characterize the BPM pickup design that is currently envisaged for the HESR, i.e. a diagonally cut cylindrical pickup. The equivalent circuit has been studied with emphasis on capacitive cross coupling. Based on our findings, performance increasing changes could be introduced. A prototype BPM was constructed and tested on a test bench. A comparison of results is presented. Another proposed design was characterized, as a symmetric coupling behavior is expected. That is a symmetrical straight four-strip geometry. Additionally an extensive study was conducted to see effects due to manufacturing tolerances. Driven by curiosity an eight-strip design was considered, which would allow for beam size measurements. First results for this configuration are shown. Used methodology, tools and results of expected signal level and sensitivity distributions are presented as well.
	Poster WEPG01 [2.172 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG01
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WEPG09	Development of a Prototype Electro-Optic Beam Position Monitor at the CERN SPS	polarization, laser, proton, optics	634
	A. Arteche, A. Bosco, S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom N. Chritin, D. Draskovic, T. Lefèvre, T.E. Levens CERN, Geneva, Switzerland
	Funding: Project funded by UK STFC grant, ST/N001583/1 A novel electro-optic beam position monitor capable of rapidly (<50ps) monitoring transverse intra-bunch perturbations is under development for the HL-LHC project. The EO-BPM relies on the fast optical response of two pairs of electro-optic crystals, whose birefringence is modified by the passing electric field of a 1ns proton bunch. Analytic models of the electric field are compared with electromagnetic simulations. A preliminary opto-mechanical design of the EO-BPM was manufactured and installed at the CERN SPS in 2016. The prototype is equipped with two pairs of 5mm cubic LiNbO3 crystals, mounted in the horizontal and vertical planes. A polarized CW 780nm laser in the counting room transmits light via 160m of PM fibre to the SPS, where delivery optics directs light through a pair of crystals in the accelerator vacuum. The input polarization state to the crystal can be remotely controlled. The modulated light after the crystal is analyzed, fibre-coupled and recorded by a fast photodetector in the counting room. Following the recent installation, we present the detailed setup and report the latest status on commissioning the device in-situ at the CERN SPS.
	Poster WEPG09 [8.441 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG09
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WEPG18	Cavity BPM System for DCLS	cavity, FEL, electron, undulator	661
	J. Chen, J. Chen, L.W. Lai, Y.B. Yan, L.Y. Yu, R.X. Yuan SINAP, Shanghai, People's Republic of China Y.B. Leng SSRF, Shanghai, People's Republic of China
	Dalian Coherent Light Source (DCLS) is a new FEL fa-cility under construction in China. Cavity beam position monitor (CBPM) is employed to measure the transverse position with a micron level resolution requirement in the undulator section. The design of cavity, RF front end and data acquisition (DAQ) system will be introduced in this paper. The preliminary measurement result with beam at Shanghai Deep ultraviolet (SDUV) FEL facility will be addressed as well.
	Poster WEPG18 [2.962 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG18
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WEPG40	Optimization Studies for an Advanced Cryogenic Current Comparator (CCC) System for FAIR	cryogenics, simulation, shielding, synchrotron	715
	T. Sieber, P. Kowina, M. Schwickert, T. Stöhlker GSI, Darmstadt, Germany J. Golm, T. Stöhlker HIJ, Jena, Germany F. Kurian, T. Stöhlker IOQ, Jena, Germany R. Neubert, V. Tympel FSU Jena, Jena, Germany
	Funding: The work is supported by BMBF (Contract number: 05P15SJRBA) After successful tests with the GSI-CCC prototype, measuring beam intensities down to 2nA at a bandwidth of 10 kHz, a new advanced Cryogenic Current Comparator system with extended geometry (CCC-XD) is under development. This system will be installed in the upcoming Cryring facility for further optimization, beam diagnostics and as an additional instrument for physics experiments. After the test phase in Cryring it is foreseen to build four additional CCC units for FAIR, where they will be installed in the HEBT lines and in the Collector Ring (CR). A universal cryostat has been designed to cope with the various boundary conditions at FAIR and at the same time to allow for uncomplicated access to the inner components. To realize this compact cryostat, the size of the superconducting magnetic shielding has to be minimized as well, without affecting its field attenuation properties. Hence detailed FEM simulations were performed to optimize the attenuation factor by variation of geometrical parameters of the shield. The beam tests results with the GSI-CCC prototype, and the developments for FAIR, as well as the results of simulation for magnetic shield optimization will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG40
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WEPG50	Non-Invasive Bunch Length Diagnostics of Sub-Picosecond Beams	detector, simulation, vacuum, real-time	756
	S.V. Kuzikov, A.A. Vikharev IAP/RAS, Nizhny Novgorod, Russia S.P. Antipov, S.V. Kuzikov Euclid TechLabs, LLC, Solon, Ohio, USA S.V. Kuzikov UNN, Nizhny Novgorod, Russia
	Funding: This work was partially supported by the Russian Scientific Foundation (grant #16-19-10448). We propose a non-invasive bunch length measurement system based on RF pickup interferometry. A device performs interferometry between two broadband wake signals generated by a single short particle bunch. The mentioned wakes are excited by two consequent small gaps in beam channel. A field pattern formed by interference of the mentioned two coherent wake signals is registered by means of detector arrays placed at outer side of beam channel. The detectors are assumed to be low-cost integrating detectors (pyro-detectors or bolometers) so that integration time is assumed to be much bigger than bunch length. Because RF signals come from gaps to any detector with different time delays which depend on particular detector coordinate, the array allows to substitute measurements in time by measurements in space. Simulations with a 1 ps beam and a set of two 200 micron wide vacuum breaks separated by 0.5 mm were done using CST Particle Studio. These simulations show good accuracy. Moreover, one can recover the detailed temporal structure of the measured pulse using a new developed synthesis procedure.
	Poster WEPG50 [2.780 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG50
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THAL02	Recent Developments for Instability Monitoring at the LHC	injection, operation, diagnostics, network	852
	T.E. Levens, K. Łasocha, T. Lefèvre CERN, Geneva, Switzerland
	A limiting factor on the maximum beam intensity that can be stored in the Large Hadron Collider (LHC) is the growth of transverse beam instabilities. Understanding and mitigating these effects requires a good knowledge of the beam parameters during the instability in order to identify the cause and provide the necessary corrections. This paper presents the suite of beam diagnostics that have been put into operation to monitor these beam instabilities and the development of a trigger system to allow measurements to be made synchronously with multiple instruments as soon as any instability is detected.
	Slides THAL02 [15.591 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-THAL02
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Paper

Title

Other Keywords

Page

MOPG08

Beam Position Monitors for LEReC

electron, electronics, ion, instrumentation

47

Z. Sorrell, P. Cerniglia, R.L. Hulsart, K. Mernick, R.J. Michnoff
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LL C under Contract No. DE-AC02-98CH10886 with the U.S. Dept. of Energy
The operating parameters for Brookhaven National Laboratory's Low Energy RHIC Electron Cooling (LEReC) project create a unique challenge. To ensure proper beam trajectories for cooling, the relative position between the electron and the ion beam needs to be known to within 50μm. In addition, time of flight needs to be provided for electron beam energy measurement. Various issues have become apparent as testing has progressed, such as mismatches in cable impedance and drifts due to temperature sensitivity. This paper will explore the difficulties related to achieving the level of accuracy required for this system, as well as the potential solutions for these problems.

Poster MOPG08 [3.304 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG08

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MOPG15

BPM Electronics for the ELBE Linear Accelerator - a Comparison

electronics, controls, embedded, instrumentation

75

U. Lehnert, A. Büchner, B. Lange, R. Schurig, R. Steinbrück
HZDR, Dresden, Germany

The ELBE linear accelerator supports a great variety of possible beam options ranging from single bunches to 1.6 mA CW beams at 13 MHz bunch repetition rate. Accordingly high are the dynamic range requirements for the BPM system. Recently, we are testing the Libera Spark EL electronics to supplement our home-built BPM electronics for low repetition rate operation. Here, we discuss the advantages and disadvantages of the two completely different detection schemes. For integration of the Libera Spark EL into our accelerator control system we are implementing an OPC-UA server embedded into the device. The server is based on the free Open62541 protocol stack which is available as open source under the LGPL.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG15

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TUPG01

Beam Based Calibration of a Rogowski Coil Used as a Horizontal and Vertical Beam Position Monitor

factory, storage-ring, dipole, synchrotron

302

F. Trinkel, F. Hinder, D. Shergelashvili, H. Soltner
FZJ, Jülich, Germany
F. Hinder
RWTH, Aachen, Germany

Electric Dipole Moments (EDMs) violate parity and time reversal symmetries. Assuming the CPT-theorem, this leads to CP violation, which is needed to explain the matter over antimatter dominance in the Universe. So far no direct EDM measurement for charged hadrons have been performed. The goal of the JEDI collaboration (Jülich Electric Dipole moment Investigations) is to measure the EDM of charged particles. The measurement of EDMs of charged hadrons can be performed in storage rings by observing a polarization build-up proportional to the EDM. Due to the smallness of the effect many systematic effects leading to a fake build-up have to be studied. A first step on the way for an EDM measurement is the investigation of systematic errors at the storage ring COSY (COoler SYnchrotron). One part of these studies is the control of the beam orbit with high precession. Therefore a concept of new Beam Position Monitors (BPMs) based on magnetic pick-up coils are used. The main advantage of the coil design is the high response to bunched beam frequency signal and the compactness of the coil itself. First measurement results of such a BPM accelerator environment will be presented.

Poster TUPG01 [1.827 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG01

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TUPG02

A Novel Electron-BPM Front End With Sub-Micron Resolution Based on Pilot-Tone Compensation: Test Results With Beam

FPGA, storage-ring, factory, electron

307

G. Brajnik, S. Carrato
University of Trieste, Trieste, Italy
S. Bassanese, G. Cautero, R. De Monte
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

In this paper we present a novel and original four channel front-end developed for a beam position monitor (BPM) system. In this work, we demonstrate for the first time the continuous calibration of the system using a pilot tone for both beam current dependency and thermal drift compensation, eliminating the need for thermoregulation. By using this original approach, we were also able to investigate several odd and well-known behaviours of BPM systems; the influence of important issues, like the non-linearity of ADCs and the gain compression of amplifiers which do affect the reliability of the measurement, have been fully understood. To achieve these results, we developed a new radio frequency front-end that combines the four pick-up signals originated by the beam with a stable and programmable tone, generated within the readout system. The signals from a button BPM of Elettra storage ring, have been acquired with a 16 bit - 160MS/s digitizer controlled by a CPU that evaluates the acquired data and applies the correction factor of the pilot tone. A final resolution equal to 1.0um, on a 20mm average radius vacuum chamber, has been measured with a long-term stability less than 1um.

Poster TUPG02 [3.671 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG02

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TUPG04

CERN PS Booster Transverse Damper: 10 kHz - 200 MHz Radiation Tolerant Amplifier for Capacitive PU Signal Conditioning

impedance, radiation, linac, electronics

315

A. Meoli, A. Blas, R. Louwerse
CERN, Geneva, Switzerland

After connection to the LINAC4, the beam intensity in the PSBooster is expected to double and thus, an upgrade of the head electronics of the transverse feedback BPM is necessary. In order to cover the beam spectrum for an effective transverse damping, the pickup (PU) signal should have a large bandwidth on both the low and high frequency sides. Furthermore, in order to extend the natural low frequency cut-off from 6MHz (50' load) down to the required 10kHz, with no modification of the existing PUs, a high impedance signal treatment is required. The electronic parts should withstand the radiation dose received during at least a year of service. This constraint implies the installation of the amplifier at a remote location. A solution was found inspired by the technique of oscilloscopes' high impedance probes that mitigates the effect of transmission line mismatch using a lossy coaxial cable with an appropriate passive circuitry. A new large bandwidth, radiation tolerant amplifier has been designed. The system requirements, the analysis, the measurements with the present PUs, the design of the amplifier and the experimental results are described in this contribution.

Poster TUPG04 [1.030 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG04

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TUPG05

Simulation of Bunch Length and Velocity Dependence of Button BPMs for Linacs Using CST Particle Studio®

simulation, linac, wakefield, proton

319

M.H. Almalki
KACST, Riyadh, Kingdom of Saudi Arabia
P. Forck, T. Sieber, R. Singh
GSI, Darmstadt, Germany

At non-relativistic velocities at a proton LINAC, the electromagnetic field generated by the beam has a significant longitudinal component, and thus the time evolution of the signal coupled to the BPM electrodes depends on bunch length and beam velocity. Extensive simulations with the electromagnetic simulation tool CST Studio® were executed to investigate the dependence of the induced BPM signal on different bunch lengths and velocities. Related to the application, the simulations are executed for the button BPM arrangement as foreseen for the FAIR Proton LINAC. These investigations provide the required inputs for the BPM system and its related technical layout such as analogue bandwidth and signal processing electronics. For the BPM electronics, it is important to estimate the contribution of the harmonic used for the data processing. Additionally, the analogue bandwidth of the BPM system is determined from studying the output signal of the button BPM as a function of bunch length at different beam velocities. This contribution presents the results of the simulations and comments on general findings relevant for a BPM layout and the operation of a hadron LINAC.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG05

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TUPG07

Commisioning of Beam Position and Phase Monitors for LIPAc

coupling, simulation, vacuum, electronics

326

I. Podadera, A. Guirao, D. Jiménez-Rey, L.M. Martínez, J. Mollá, A. Soleto, R. Varela
CIEMAT, Madrid, Spain

Funding: Work partially supported by the Spanish Ministry of Science and Innovation under project AIC-A-2011-0654 and FIS2013-40860-R
The LIPAc accelerator will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF accelerator. Several types of Beam Position Monitors BPMs- are placed in each section of the accelerator to ensure a good beam transport and minimize beam losses. LIPAc is presently under installation and commissioning of the second acceleration stage at 5 MeV. In this stage two types of BPMs are used: four striplines to control the position at the Medium Energy Beam Transport line (MEBT), and three striplines to precisely measure the mean beam energy at the Diagnostics Plate. The seven pickups have been installed and assembled in the beamlines after characterization in a wire test bench, and are presently been commissioned in the facility. In addition, the in-house acquisition system has been fully developed and tested in the wire test bench at CIEMAT. In this contribution, the results of the beam position monitors characterization, the tests carried out during the assembly and the first measurements with the electronics system will be reported.

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG07

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TUPG46

Improvements to the LHC Schottky Monitors

cavity, insertion, synchrotron, coupling

453

M. Wendt, M. Betz, O.R. Jones, T. Lefèvre, T.E. Levens
CERN, Geneva, Switzerland

The LHC Schottky monitors have the potential to measure and monitor some important beam parameters, tune, momentum spread, chromaticity and emittance, in a non-invasive way. We present recent upgrade and improvement efforts of the transverse LHC Schottky systems operating at 4.8 GHz. This includes optimization of the slotted waveguide pickups and a re-design of the RF front-end electronics to detect the weak, incoherent Schottky signals in presence of large, coherent beam harmonics.

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TUPG53

Bunch Arrival-Time Monitoring for Laser Particle Accelerators and Thomson Scattering X-Ray Sources

laser, electron, timing, detector

468

J.M. Kraemer, M. Kuntzsch, U. Lehnert, P. Michel, U. Schramm
HZDR, Dresden, Germany
J.P. Couperus, A. Irman, A. Koehler, O. Zarini
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany

The ELBE center of high power radiation sources at Helmholtz-Zentrum Dresden-Rossendorf combines a superconducting CW linear accelerator with Terawatt- and Petawatt-level laser sources. Key experiments rely on precise timing and synchronization between the different radiation pulses. An online single shot monitoring system has been set up in order to measure the timing between the high-power Ti:Sa laser DRACO and electron bunches generated by the conventional SRF accelerator. This turnkey timing system is suitable for timing control of Thomson scattering X-ray sources and external injection of electron bunches into a laser wakefield accelerator. It uses a broadband RF pickup to acquire a probe of the particle bunch's electric field and modulates a fraction of the high power laser pulse in a fast electro-optical modulator. The amplitude modulation gives a direct measure for the timing between both beams. Using this setup a resolution of <200 fs RMS has been demonstrated. The contribution will show the prototype, first measurement results and will discuss future modification in order to improve the resolution of the system.

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WEPG01

Numerical Comparative Study of BPM Designs for the HESR at FAIR

simulation, emittance, monitoring, software

608

A.J. Halama, C. Böhme, V. Kamerdzhiev, F. Klehr, S. Srinivasan
FZJ, Jülich, Germany

The institute of Nuclear Physics 4(IKP-4) of the Research Center Jülich (FZJ) is in charge of building and commissioning the High Energy Storage Ring (HESR) within the international Facility for Antiproton and Ion Research (FAIR) at Darmstadt. Simulations and numerical calculations were performed to characterize the BPM pickup design that is currently envisaged for the HESR, i.e. a diagonally cut cylindrical pickup. The equivalent circuit has been studied with emphasis on capacitive cross coupling. Based on our findings, performance increasing changes could be introduced. A prototype BPM was constructed and tested on a test bench. A comparison of results is presented. Another proposed design was characterized, as a symmetric coupling behavior is expected. That is a symmetrical straight four-strip geometry. Additionally an extensive study was conducted to see effects due to manufacturing tolerances. Driven by curiosity an eight-strip design was considered, which would allow for beam size measurements. First results for this configuration are shown. Used methodology, tools and results of expected signal level and sensitivity distributions are presented as well.

Poster WEPG01 [2.172 MB]

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WEPG09

Development of a Prototype Electro-Optic Beam Position Monitor at the CERN SPS

polarization, laser, proton, optics

634

A. Arteche, A. Bosco, S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom
N. Chritin, D. Draskovic, T. Lefèvre, T.E. Levens
CERN, Geneva, Switzerland

Funding: Project funded by UK STFC grant, ST/N001583/1
A novel electro-optic beam position monitor capable of rapidly (<50ps) monitoring transverse intra-bunch perturbations is under development for the HL-LHC project. The EO-BPM relies on the fast optical response of two pairs of electro-optic crystals, whose birefringence is modified by the passing electric field of a 1ns proton bunch. Analytic models of the electric field are compared with electromagnetic simulations. A preliminary opto-mechanical design of the EO-BPM was manufactured and installed at the CERN SPS in 2016. The prototype is equipped with two pairs of 5mm cubic LiNbO3 crystals, mounted in the horizontal and vertical planes. A polarized CW 780nm laser in the counting room transmits light via 160m of PM fibre to the SPS, where delivery optics directs light through a pair of crystals in the accelerator vacuum. The input polarization state to the crystal can be remotely controlled. The modulated light after the crystal is analyzed, fibre-coupled and recorded by a fast photodetector in the counting room. Following the recent installation, we present the detailed setup and report the latest status on commissioning the device in-situ at the CERN SPS.

Poster WEPG09 [8.441 MB]

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WEPG18

Cavity BPM System for DCLS

cavity, FEL, electron, undulator

661

J. Chen, J. Chen, L.W. Lai, Y.B. Yan, L.Y. Yu, R.X. Yuan
SINAP, Shanghai, People's Republic of China
Y.B. Leng
SSRF, Shanghai, People's Republic of China

Dalian Coherent Light Source (DCLS) is a new FEL fa-cility under construction in China. Cavity beam position monitor (CBPM) is employed to measure the transverse position with a micron level resolution requirement in the undulator section. The design of cavity, RF front end and data acquisition (DAQ) system will be introduced in this paper. The preliminary measurement result with beam at Shanghai Deep ultraviolet (SDUV) FEL facility will be addressed as well.

Poster WEPG18 [2.962 MB]

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WEPG40

Optimization Studies for an Advanced Cryogenic Current Comparator (CCC) System for FAIR

cryogenics, simulation, shielding, synchrotron

715

T. Sieber, P. Kowina, M. Schwickert, T. Stöhlker
GSI, Darmstadt, Germany
J. Golm, T. Stöhlker
HIJ, Jena, Germany
F. Kurian, T. Stöhlker
IOQ, Jena, Germany
R. Neubert, V. Tympel
FSU Jena, Jena, Germany

Funding: The work is supported by BMBF (Contract number: 05P15SJRBA)
After successful tests with the GSI-CCC prototype, measuring beam intensities down to 2nA at a bandwidth of 10 kHz, a new advanced Cryogenic Current Comparator system with extended geometry (CCC-XD) is under development. This system will be installed in the upcoming Cryring facility for further optimization, beam diagnostics and as an additional instrument for physics experiments. After the test phase in Cryring it is foreseen to build four additional CCC units for FAIR, where they will be installed in the HEBT lines and in the Collector Ring (CR). A universal cryostat has been designed to cope with the various boundary conditions at FAIR and at the same time to allow for uncomplicated access to the inner components. To realize this compact cryostat, the size of the superconducting magnetic shielding has to be minimized as well, without affecting its field attenuation properties. Hence detailed FEM simulations were performed to optimize the attenuation factor by variation of geometrical parameters of the shield. The beam tests results with the GSI-CCC prototype, and the developments for FAIR, as well as the results of simulation for magnetic shield optimization will be presented.

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WEPG50

Non-Invasive Bunch Length Diagnostics of Sub-Picosecond Beams

detector, simulation, vacuum, real-time

756

S.V. Kuzikov, A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia
S.P. Antipov, S.V. Kuzikov
Euclid TechLabs, LLC, Solon, Ohio, USA
S.V. Kuzikov
UNN, Nizhny Novgorod, Russia

Funding: This work was partially supported by the Russian Scientific Foundation (grant #16-19-10448).
We propose a non-invasive bunch length measurement system based on RF pickup interferometry. A device performs interferometry between two broadband wake signals generated by a single short particle bunch. The mentioned wakes are excited by two consequent small gaps in beam channel. A field pattern formed by interference of the mentioned two coherent wake signals is registered by means of detector arrays placed at outer side of beam channel. The detectors are assumed to be low-cost integrating detectors (pyro-detectors or bolometers) so that integration time is assumed to be much bigger than bunch length. Because RF signals come from gaps to any detector with different time delays which depend on particular detector coordinate, the array allows to substitute measurements in time by measurements in space. Simulations with a 1 ps beam and a set of two 200 micron wide vacuum breaks separated by 0.5 mm were done using CST Particle Studio. These simulations show good accuracy. Moreover, one can recover the detailed temporal structure of the measured pulse using a new developed synthesis procedure.

Poster WEPG50 [2.780 MB]

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THAL02

Recent Developments for Instability Monitoring at the LHC

injection, operation, diagnostics, network

852

T.E. Levens, K. Łasocha, T. Lefèvre
CERN, Geneva, Switzerland

A limiting factor on the maximum beam intensity that can be stored in the Large Hadron Collider (LHC) is the growth of transverse beam instabilities. Understanding and mitigating these effects requires a good knowledge of the beam parameters during the instability in order to identify the cause and provide the necessary corrections. This paper presents the suite of beam diagnostics that have been put into operation to monitor these beam instabilities and the development of a trigger system to allow measurements to be made synchronously with multiple instruments as soon as any instability is detected.

Slides THAL02 [15.591 MB]

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