IBIC2016 - List of Keywords (timing)

Paper	Title	Other Keywords	Page
MOPG36	Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector	detector, simulation, radiation, photon	123
	J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei NUAA, Nanjing, People's Republic of China
	The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range. L. Karsch, A. Bohm et al, "Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.
	Poster MOPG36 [5.665 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG36
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TUAL03	Beam Loss and Abort Diagnostics during SuperKEKB Phase-I Operation	hardware, injection, kicker, cavity	282
	H. Ikeda, J.W. Flanagan, H. Fukuma, T. Furuya, M. Tobiyama KEK, Ibaraki, Japan
	Beam commissioning of SuperKEKB Phase-I started in Feb., 2016. In order to protect the hardware components of the accelerator against unstable Ampere class beams, the controlled beam abort system was upgraded. Because of the higher beam intensity and shorter beam lifetime than at the original KEKB, a beam abort monitor system is important for machine tuning and the safety of the components. The system collected the data of all aborts of more than 1000 in this operation period, and we diagnosed not only the hardware performance but the tuning software by analyzing the relations between beam current, loss monitor signals and RF cavity voltages. This paper will give the outline of the monitoring system, and will present typical examples of signal and diagnoses.
	Slides TUAL03 [25.716 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUAL03
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TUBL03	Synchronous Laser-Microwave Network for Attosecond-Resolution Photon Science	laser, network, detector, polarization	286
	K. Shafak, F.X. Kärtner, A. Kalaydzhyan, O.D. Mücke, W. Wang, M. Xin CFEL, Hamburg, Germany F.X. Kärtner, M.Y. Peng, M. Xin MIT, Cambridge, Massachusetts, USA
	Funding: This work was supported by the Center for Free-Electron Laser Science at Deutsches Elektronen-Synchrotron, a research center of the Helmholtz Association in Germany. Next-generation photon-science facilities such as X-ray free-electron lasers (X-FELs)* and intense-laser beamline centers are emerging world-wide with the goal of generating sub-fs X-ray pulses with unprecedented brightness to capture ultrafast chemical and physical phenomena with sub-atomic spatiotemporal resolution. The only obstacle preventing this long-standing scientific dream to come true is a high- precision timing distribution system* synchronizing various microwave and optical sub-sources across multi-km distances which is required for seeded X-FELs and attosecond pump-probe experiments. Here, we present, for the first time, a synchronous laser-microwave network that will enable attosecond precision photon science facilities. By developing new ultrafast metrological timing devices and carefully balancing fiber nonlinearities and fundamental noise contributions, we have achieved timing stabilization of a 4.7 km fiber network with 580 attosecond precision over 52 hours. Furthermore, we have realized a complete laser-microwave network incorporating two mode-locked lasers and one microwave source with total 950 attosecond jitter integrated from 1 microsecond to 18 hours. J. Stohr, LCLS-II Conceptual Design Report. No. SLAC-R-978. (SLAC, 2011). G. Mourou, T. Tajima, Optics & Photonics News 22, 47 (2011). **J. Kim, et al., Nat. Photonics 2(12), 733-736 (2008).
	Slides TUBL03 [11.692 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUBL03
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TUPG10	LCLS-1 Cavity BPM Algorithm for Unlocked Digitizer Clock	cavity, detector, operation, dipole	336
	T. Straumann, S.R. Smith SLAC, Menlo Park, California, USA
	Funding: Work supported by U.S. Department of Energy Contract No. DE-AC02-76SF00515 Cavity BPMs commonly use the fundamental TM010 mode (excited either in the x/y cavity itself or in a separate "reference" cavity) which is insensitive to beam position as a reference signal, not only for amplitude normalization but also as a phase/time reference to facilitate synchronous detection of the signal derived from the position-sensitive TM110 mode. When taking these signals into the digital domain the reference and position signals need to be acquired by a synchronous clock. However, unless this clock is also locked to the accelerating RF, absolute timing information is lost which affects the relative phase between reference and position signals (assuming they are not carefully tuned to the same frequency). This contribution presents a method for estimating the necessary time of arrival information based on the sampled reference signal which is used to make the signal detection insensitive to the phase of the digitizer clock. Running an unlocked digitizer clock allows for considerable simplification of infrastructure (cabling, PLLs) and thus decreases cost and eases maintenance.
	Poster TUPG10 [1.100 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG10
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TUPG22	Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector	detector, simulation, radiation, photon	372
	J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei NUAA, Nanjing, People's Republic of China
	The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range. L. Karsch, A. Bohm et al,"Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.
	Poster TUPG22 [5.665 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG22
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TUPG37	A PPS Compliant Injected Charge Monitor at NSLS-II	PLC, linac, operation, monitoring	422
	A. Caracappa, C. Danneil, R.P. Fliller, D. Padrazo, O. Singh BNL, Upton, Long Island, New York, USA
	Part of the NSLS-II Personnel Protection System (PPS), the Accumulated Charge Monitor Interlock (ACMI) was developed to ensure the Accelerator Safety Envelope (ASE) limits for charge generation in the NSLS-II Injector are never violated. The ACMI measures the amount of charge in each injection shot using an Integrating Current Transformer (ICT). For logistical reasons, adding a redundant ICT was impractical so in order to achieve the high reliability required for PPS this system is designed to perform self-tests by injecting calibrated charge pulses into a test coil on the ICT and analyzing the returning charge signal. The injector trigger rate is 1.97Hz and self-tests are performed 250 mSec after every trigger pulse. Despite the lack of a redundant charge measurement the ACMI achieved the high reliability rating required for PPS with a mean time between failure (MTBF) rate greater than 10⁶ hours. The ACMI was commissioned in 2014 and has operated to date without any major problems. In 2015 a second ACMI system was commissioned at another location in the injection system.
	Poster TUPG37 [2.212 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG37
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TUPG53	Bunch Arrival-Time Monitoring for Laser Particle Accelerators and Thomson Scattering X-Ray Sources	laser, electron, pick-up, 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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TUPG61	Stable Transmission of RF Signals and Timing Events With Accuracy at Femtoseconds	laser, electron, feedback, controls	491
	M. Liu, X.L. Dai, C.X. Yin SINAP, Shanghai, People's Republic of China
	Funding: Supported by the National Natural Science Foundation of China (No. 11305246) and the Youth Innovation Promotion Association CAS (No. 2016238). We present a new design of femtosecond timing system. In the system, RF signal and timing events are transmitted synchronously in one single optical fiber with very high accuracy. Based on the theory of Michelson's interferometer, phase drift is detected with accuracy at femtoseconds. And phase compensation is accomplished in transmitter with two approaches afterwards. Moreover, the traditional event timing system is integrated into the new system to further reduce the jitter of timing triggers. The system could be applied in synchrotron light sources, free electron lasers and colliders, where distribution of highly stable timing information is required. The physics design, simulation analysis and preliminary results are demonstrated in the paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG61
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WEPG15	A FPGA Based Common Platform for LCLS2 Beam Diagnostics and Controls	network, FPGA, hardware, controls	650
	J.C. Frisch, R. Claus, J.M. D'Ewart, G. Haller, R.T. Herbst, B. Hong, U. Legat, L. Ma, J.J. Olsen, B.A. Reese, R. Ruckman, L. Sapozhnikov, S.R. Smith, T. Straumann, D. Van Winkle, J.A. Vásquez, M. Weaver, E. Williams, C. Xu, A. Young SLAC, Menlo Park, California, USA
	Funding: work supported by Department of Energy contract DE-AC02-76SF00515 The LCLS2 is a CW superconducting LINAC driven X-ray free electron laser under construction at SLAC. The high beam rate of up to 1MHz, and ability to deliver electrons to multiple undulators and beam dumps, results in a beam diagnostics and control system that requires real time data processing in programmable logic. The SLAC Technical Innovation Directorate has developed a common hardware and firmware platform for beam instrumentation based on the ATCA crate format. The FPGAs are located on ATCA carrier cards, front ends and A-D / D-A are on AMC cards that are connected to the carriers by high speed serial JESD links. External communication is through the ATCA backplane, with interlocks and low frequency components on the ATCA RTM. This platform is used for a variety of high speed diagnostics including stripline and cavity BPMs.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG15
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WEPG16	The SLAC LINAC LLRF Controls Upgrade	klystron, linac, LLRF, controls	654
	D. Van Winkle, J.M. D'Ewart, J.C. Frisch, B. Hong, U. Legat, J.J. Olsen, P. Seward, J.A. Vásquez SLAC, Menlo Park, California, USA
	Funding: Work supported by Department of Energy contract DE-AC02-76SF00515 The low level RF control for the SLAC LINAC is being upgraded to provide improved performance and maintainability. RF control is through a high performance FPGA based DDS/DDC system built on the SLAC ATCA common platform. The klystron and modulator interlocks are being upgraded, and the interlocks are being moved into a combination of PLC logic and a fast trip system. A new solid state sub-booster amplifier will eliminate the need for the 1960s vintage high RF phase shifters and attenuators.
	Poster WEPG16 [12.133 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG16
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WEPG52	Laser Arrival Time Measurement and Correction for the SwissFEL Lasers	laser, gun, FEL, experiment	763
	M.C. Divall, C.P. Hauri, S. Hunziker, A. Romann, A. Trisorio PSI, Villigen PSI, Switzerland
	SwissFEL will ultimately produce sub-fs X-ray pulses. Both the photo-injector laser and the pump lasers used for the experimental end stations therefore have tight requirements for relative arrival time to the machine and the X-rays. The gun laser oscillator delivers excellent jitter performance at ~20fs integrated from 10Hz-10MHz. The Yb:CaF2 regenerative amplifier, with an over 1km total propagation path, calls for active control of the laser arrival time. This is achieved by balanced cross-correlation against the oscillator pulses and a translation stage before amplification. The experimental laser, based on Ti:sapphire laser technology will use a spectrally resolved cross-correlator to determine relative jitter between the optical reference and the laser, with fs resolution. To be able to perform fs resolution pump-probe measurements the laser has to be timed with the X-rays with <10fs accuracy. These systems will be integrated into the machine timing and complemented by electron bunch and X-ray timing tools. Here we present the overall concept and the first results obtained on the existing laser systems.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG52
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WEPG54	Bunch Shape Measurements at the National Superconducting Cyclotron Laboratory ReAccelerator (ReA3)	cavity, background, electron, bunching	771
	R. Shane, S.M. Lidia, Z. Liu, S. Nash, A.C.C. Villari, O. Yair FRIB, East Lansing, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University. The longitudinal bunch shape of a reaccelerated heavy-ion beam at the National Superconducting Cyclo-tron Laboratory's (NSCL) ReA3 beamline was measured using an Ostrumov-type bunch-shape monitor. The phase of the last accelerating cavity was varied to change the bunch length, while the energy was kept constant by adjusting the amplitude of the voltage on the cavity. Two peaks were observed in the longitudinal projection of the bunch shape distribution. The widths of the two peaks did not vary much when the cavity phase was changed, while the peak separation decreased to the point that the two peaks became unresolvable as the bunching was increased. The relative amplitudes of the two peaks was very sensitive to tuning parameters. This, coupled with a lack of information about the transverse profile of the bunch, complicated the analysis and made a simple width assignment difficult. Measurements were also made with an MCP timing grid for comparison. The general shape and trend of the two data sets were similar; however, the widths measured by the timing grid were about 30-50% smaller.
	Poster WEPG54 [2.160 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG54
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WEPG71	3D Density Scans of a Supersonic Gas Jet for Beam Profile Monitoring	ion, diagnostics, electron, operation	815
	H.D. Zhang, V. Tzoganis, C.P. Welsch, W. Widmann Cockcroft Institute, Warrington, Cheshire, United Kingdom V. Tzoganis, C.P. Welsch, W. Widmann, H.D. Zhang The University of Liverpool, Liverpool, United Kingdom
	Funding: STFC Cockcroft and EU under GA 215080. A beam profile monitor based on a supersonic gas jet was successfully tested at the Cockcroft Institute. This monitor can be used for a large variety of beams over a large energy range, including high intensity/high energy beams with large destructive power which make the use of many commonly used diagnostics impossible, and beams with a short life time which require minimum interference of the diagnostics. The achievable resolution of this type of monitor depends on the jet thickness and homogeneity. Detailed knowledge of the jet density profile is hence of high importance. In this contribution we present how a moveable vacuum gauge was successfully used to investigate the 3D density distribution of the jet. We compare the experimental data to results from simulations and discuss how the findings can help further improve of the overall jet design.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG71
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WEPG73	A Hardware and Software Overview on the New BTF Transverse Profile Monitor	software, detector, linac, positron	818
	B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta INFN/LNF, Frascati (Roma), Italy P. Valente INFN-Roma, Roma, Italy
	Funding: Supported by the H2020 project AIDA-2020, GA no. 654168 In the last 11 years, the Beam-Test Facility (BTF) of the DAΦNE accelerator complex, in the Frascati laboratory, has gained an important role in the EU infrastructures devoted to the development of particle detectors. The facility can provide runtime tuneable electrons and positrons beams in a range of different parameters: energy (up to 750 MeV for e^- and 540 MeV for e+), charge ( up to 10¹⁰ e /bunch) and pulse length (1.4-40 ns). The bunch delivering rate is up to 49 Hz and the beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad, in order to achieve user needs. In these paper we are going to describe the new implementation of the secondary BTF beam transverse monitor systems based on WIDEPIX FITPIX detectors, operating in bus synchronization mode externally timed to BTF beams. Our software layout includes a data producer, a live-data display consumer and a MEMCACHED caching server. This configuration offers to BTF users a vary fast approach to the transverse data using TCP/IP calls to MEMCACHED with an easy and fast software integration on users DAQ. The data packing permits also to avoid the needs of mixed (user vs BTF) hardware synchronization.
	Poster WEPG73 [3.267 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG73
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Paper

Title

Other Keywords

Page

MOPG36

Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector

detector, simulation, radiation, photon

123

J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei
NUAA, Nanjing, People's Republic of China

The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range*.
* L. Karsch, A. Bohm et al, "Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.

Poster MOPG36 [5.665 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG36

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TUAL03

Beam Loss and Abort Diagnostics during SuperKEKB Phase-I Operation

hardware, injection, kicker, cavity

282

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

Beam commissioning of SuperKEKB Phase-I started in Feb., 2016. In order to protect the hardware components of the accelerator against unstable Ampere class beams, the controlled beam abort system was upgraded. Because of the higher beam intensity and shorter beam lifetime than at the original KEKB, a beam abort monitor system is important for machine tuning and the safety of the components. The system collected the data of all aborts of more than 1000 in this operation period, and we diagnosed not only the hardware performance but the tuning software by analyzing the relations between beam current, loss monitor signals and RF cavity voltages. This paper will give the outline of the monitoring system, and will present typical examples of signal and diagnoses.

Slides TUAL03 [25.716 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUAL03

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TUBL03

Synchronous Laser-Microwave Network for Attosecond-Resolution Photon Science

laser, network, detector, polarization

286

K. Shafak, F.X. Kärtner, A. Kalaydzhyan, O.D. Mücke, W. Wang, M. Xin
CFEL, Hamburg, Germany
F.X. Kärtner, M.Y. Peng, M. Xin
MIT, Cambridge, Massachusetts, USA

Funding: This work was supported by the Center for Free-Electron Laser Science at Deutsches Elektronen-Synchrotron, a research center of the Helmholtz Association in Germany.
Next-generation photon-science facilities such as X-ray free-electron lasers (X-FELs)* and intense-laser beamline centers** are emerging world-wide with the goal of generating sub-fs X-ray pulses with unprecedented brightness to capture ultrafast chemical and physical phenomena with sub-atomic spatiotemporal resolution. The only obstacle preventing this long-standing scientific dream to come true is a high- precision timing distribution system*** synchronizing various microwave and optical sub-sources across multi-km distances which is required for seeded X-FELs and attosecond pump-probe experiments. Here, we present, for the first time, a synchronous laser-microwave network that will enable attosecond precision photon science facilities. By developing new ultrafast metrological timing devices and carefully balancing fiber nonlinearities and fundamental noise contributions, we have achieved timing stabilization of a 4.7 km fiber network with 580 attosecond precision over 52 hours. Furthermore, we have realized a complete laser-microwave network incorporating two mode-locked lasers and one microwave source with total 950 attosecond jitter integrated from 1 microsecond to 18 hours.
*J. Stohr, LCLS-II Conceptual Design Report. No. SLAC-R-978. (SLAC, 2011).
**G. Mourou, T. Tajima, Optics & Photonics News 22, 47 (2011).
***J. Kim, et al., Nat. Photonics 2(12), 733-736 (2008).

Slides TUBL03 [11.692 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUBL03

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TUPG10

LCLS-1 Cavity BPM Algorithm for Unlocked Digitizer Clock

cavity, detector, operation, dipole

336

T. Straumann, S.R. Smith
SLAC, Menlo Park, California, USA

Funding: Work supported by U.S. Department of Energy Contract No. DE-AC02-76SF00515
Cavity BPMs commonly use the fundamental TM010 mode (excited either in the x/y cavity itself or in a separate "reference" cavity) which is insensitive to beam position as a reference signal, not only for amplitude normalization but also as a phase/time reference to facilitate synchronous detection of the signal derived from the position-sensitive TM110 mode. When taking these signals into the digital domain the reference and position signals need to be acquired by a synchronous clock. However, unless this clock is also locked to the accelerating RF, absolute timing information is lost which affects the relative phase between reference and position signals (assuming they are not carefully tuned to the same frequency). This contribution presents a method for estimating the necessary time of arrival information based on the sampled reference signal which is used to make the signal detection insensitive to the phase of the digitizer clock. Running an unlocked digitizer clock allows for considerable simplification of infrastructure (cabling, PLLs) and thus decreases cost and eases maintenance.

Poster TUPG10 [1.100 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG10

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TUPG22

Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector

detector, simulation, radiation, photon

372

J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei
NUAA, Nanjing, People's Republic of China

The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range*.
* L. Karsch, A. Bohm et al,"Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.

Poster TUPG22 [5.665 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG22

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TUPG37

A PPS Compliant Injected Charge Monitor at NSLS-II

PLC, linac, operation, monitoring

422

A. Caracappa, C. Danneil, R.P. Fliller, D. Padrazo, O. Singh
BNL, Upton, Long Island, New York, USA

Part of the NSLS-II Personnel Protection System (PPS), the Accumulated Charge Monitor Interlock (ACMI) was developed to ensure the Accelerator Safety Envelope (ASE) limits for charge generation in the NSLS-II Injector are never violated. The ACMI measures the amount of charge in each injection shot using an Integrating Current Transformer (ICT). For logistical reasons, adding a redundant ICT was impractical so in order to achieve the high reliability required for PPS this system is designed to perform self-tests by injecting calibrated charge pulses into a test coil on the ICT and analyzing the returning charge signal. The injector trigger rate is 1.97Hz and self-tests are performed 250 mSec after every trigger pulse. Despite the lack of a redundant charge measurement the ACMI achieved the high reliability rating required for PPS with a mean time between failure (MTBF) rate greater than 10⁶ hours. The ACMI was commissioned in 2014 and has operated to date without any major problems. In 2015 a second ACMI system was commissioned at another location in the injection system.

Poster TUPG37 [2.212 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG37

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TUPG53

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

laser, electron, pick-up, 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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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG53

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TUPG61

Stable Transmission of RF Signals and Timing Events With Accuracy at Femtoseconds

laser, electron, feedback, controls

491

M. Liu, X.L. Dai, C.X. Yin
SINAP, Shanghai, People's Republic of China

Funding: Supported by the National Natural Science Foundation of China (No. 11305246) and the Youth Innovation Promotion Association CAS (No. 2016238).
We present a new design of femtosecond timing system. In the system, RF signal and timing events are transmitted synchronously in one single optical fiber with very high accuracy. Based on the theory of Michelson's interferometer, phase drift is detected with accuracy at femtoseconds. And phase compensation is accomplished in transmitter with two approaches afterwards. Moreover, the traditional event timing system is integrated into the new system to further reduce the jitter of timing triggers. The system could be applied in synchrotron light sources, free electron lasers and colliders, where distribution of highly stable timing information is required. The physics design, simulation analysis and preliminary results are demonstrated in the paper.

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG61

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WEPG15

A FPGA Based Common Platform for LCLS2 Beam Diagnostics and Controls

network, FPGA, hardware, controls

650

J.C. Frisch, R. Claus, J.M. D'Ewart, G. Haller, R.T. Herbst, B. Hong, U. Legat, L. Ma, J.J. Olsen, B.A. Reese, R. Ruckman, L. Sapozhnikov, S.R. Smith, T. Straumann, D. Van Winkle, J.A. Vásquez, M. Weaver, E. Williams, C. Xu, A. Young
SLAC, Menlo Park, California, USA

Funding: work supported by Department of Energy contract DE-AC02-76SF00515
The LCLS2 is a CW superconducting LINAC driven X-ray free electron laser under construction at SLAC. The high beam rate of up to 1MHz, and ability to deliver electrons to multiple undulators and beam dumps, results in a beam diagnostics and control system that requires real time data processing in programmable logic. The SLAC Technical Innovation Directorate has developed a common hardware and firmware platform for beam instrumentation based on the ATCA crate format. The FPGAs are located on ATCA carrier cards, front ends and A-D / D-A are on AMC cards that are connected to the carriers by high speed serial JESD links. External communication is through the ATCA backplane, with interlocks and low frequency components on the ATCA RTM. This platform is used for a variety of high speed diagnostics including stripline and cavity BPMs.

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG15

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WEPG16

The SLAC LINAC LLRF Controls Upgrade

klystron, linac, LLRF, controls

654

D. Van Winkle, J.M. D'Ewart, J.C. Frisch, B. Hong, U. Legat, J.J. Olsen, P. Seward, J.A. Vásquez
SLAC, Menlo Park, California, USA

Funding: Work supported by Department of Energy contract DE-AC02-76SF00515
The low level RF control for the SLAC LINAC is being upgraded to provide improved performance and maintainability. RF control is through a high performance FPGA based DDS/DDC system built on the SLAC ATCA common platform. The klystron and modulator interlocks are being upgraded, and the interlocks are being moved into a combination of PLC logic and a fast trip system. A new solid state sub-booster amplifier will eliminate the need for the 1960s vintage high RF phase shifters and attenuators.

Poster WEPG16 [12.133 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG16

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WEPG52

Laser Arrival Time Measurement and Correction for the SwissFEL Lasers

laser, gun, FEL, experiment

763

M.C. Divall, C.P. Hauri, S. Hunziker, A. Romann, A. Trisorio
PSI, Villigen PSI, Switzerland

SwissFEL will ultimately produce sub-fs X-ray pulses. Both the photo-injector laser and the pump lasers used for the experimental end stations therefore have tight requirements for relative arrival time to the machine and the X-rays. The gun laser oscillator delivers excellent jitter performance at ~20fs integrated from 10Hz-10MHz. The Yb:CaF2 regenerative amplifier, with an over 1km total propagation path, calls for active control of the laser arrival time. This is achieved by balanced cross-correlation against the oscillator pulses and a translation stage before amplification. The experimental laser, based on Ti:sapphire laser technology will use a spectrally resolved cross-correlator to determine relative jitter between the optical reference and the laser, with fs resolution. To be able to perform fs resolution pump-probe measurements the laser has to be timed with the X-rays with <10fs accuracy. These systems will be integrated into the machine timing and complemented by electron bunch and X-ray timing tools. Here we present the overall concept and the first results obtained on the existing laser systems.

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG52

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WEPG54

Bunch Shape Measurements at the National Superconducting Cyclotron Laboratory ReAccelerator (ReA3)

cavity, background, electron, bunching

771

R. Shane, S.M. Lidia, Z. Liu, S. Nash, A.C.C. Villari, O. Yair
FRIB, East Lansing, USA

Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
The longitudinal bunch shape of a reaccelerated heavy-ion beam at the National Superconducting Cyclo-tron Laboratory's (NSCL) ReA3 beamline was measured using an Ostrumov-type bunch-shape monitor. The phase of the last accelerating cavity was varied to change the bunch length, while the energy was kept constant by adjusting the amplitude of the voltage on the cavity. Two peaks were observed in the longitudinal projection of the bunch shape distribution. The widths of the two peaks did not vary much when the cavity phase was changed, while the peak separation decreased to the point that the two peaks became unresolvable as the bunching was increased. The relative amplitudes of the two peaks was very sensitive to tuning parameters. This, coupled with a lack of information about the transverse profile of the bunch, complicated the analysis and made a simple width assignment difficult. Measurements were also made with an MCP timing grid for comparison. The general shape and trend of the two data sets were similar; however, the widths measured by the timing grid were about 30-50% smaller.

Poster WEPG54 [2.160 MB]

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WEPG71

3D Density Scans of a Supersonic Gas Jet for Beam Profile Monitoring

ion, diagnostics, electron, operation

815

H.D. Zhang, V. Tzoganis, C.P. Welsch, W. Widmann
Cockcroft Institute, Warrington, Cheshire, United Kingdom
V. Tzoganis, C.P. Welsch, W. Widmann, H.D. Zhang
The University of Liverpool, Liverpool, United Kingdom

Funding: STFC Cockcroft and EU under GA 215080.
A beam profile monitor based on a supersonic gas jet was successfully tested at the Cockcroft Institute. This monitor can be used for a large variety of beams over a large energy range, including high intensity/high energy beams with large destructive power which make the use of many commonly used diagnostics impossible, and beams with a short life time which require minimum interference of the diagnostics. The achievable resolution of this type of monitor depends on the jet thickness and homogeneity. Detailed knowledge of the jet density profile is hence of high importance. In this contribution we present how a moveable vacuum gauge was successfully used to investigate the 3D density distribution of the jet. We compare the experimental data to results from simulations and discuss how the findings can help further improve of the overall jet design.

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG71

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WEPG73

A Hardware and Software Overview on the New BTF Transverse Profile Monitor

software, detector, linac, positron

818

B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
INFN/LNF, Frascati (Roma), Italy
P. Valente
INFN-Roma, Roma, Italy

Funding: Supported by the H2020 project AIDA-2020, GA no. 654168
In the last 11 years, the Beam-Test Facility (BTF) of the DAΦNE accelerator complex, in the Frascati laboratory, has gained an important role in the EU infrastructures devoted to the development of particle detectors. The facility can provide runtime tuneable electrons and positrons beams in a range of different parameters: energy (up to 750 MeV for e^- and 540 MeV for e+), charge ( up to 10¹⁰ e /bunch) and pulse length (1.4-40 ns). The bunch delivering rate is up to 49 Hz and the beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad, in order to achieve user needs. In these paper we are going to describe the new implementation of the secondary BTF beam transverse monitor systems based on WIDEPIX FITPIX detectors, operating in bus synchronization mode externally timed to BTF beams. Our software layout includes a data producer, a live-data display consumer and a MEMCACHED caching server. This configuration offers to BTF users a vary fast approach to the transverse data using TCP/IP calls to MEMCACHED with an easy and fast software integration on users DAQ. The data packing permits also to avoid the needs of mixed (user vs BTF) hardware synchronization.

Poster WEPG73 [3.267 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG73

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