| Paper |
Title |
Page |
| MOPAN108 |
The FONT4 ILC Intra-train Beam-based Digital Feedback System Prototype
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416 |
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- P. Burrows, G. B. Christian, C. I. Clarke, B. Constance, A. F. Hartin, H. D. Khah, C. Perry, C. Swinson, G. R. White
JAI, Oxford
- A. Kalinin
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- S. Molloy
SLAC, Menlo Park, California
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We present the design of the FONT4 intra-train beam-based digital position feedback system prototype. The system incorporates a fast analogue beam position monitor front-end signal processor, a digital feedback board, and a fast kicker-driver amplifier. The system latency goal is less than 150ns. We report preliminary results of beam tests at the Accelerator Test Facility (ATF) at KEK using electron bunches separated by c. 150ns.
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| WEOBAB01 |
Electromagnetic Background Tests for the ILC Interaction Point Feedback System
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1970 |
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- P. Burrows, G. B. Christian, C. I. Clarke, B. Constance, A. F. Hartin, H. D. Khah, C. Perry, C. Swinson, G. R. White
JAI, Oxford
- R. Arnold, S. Molloy, S. Smith, G. R. White, M. Woods
SLAC, Menlo Park, California
- A. Kalinin
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
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We present results obtained with the T-488 experiment at SLAC Endstation A (ESA). A material model of the ILC extraction-line design was assembled and installed in ESA. The module includes materials representing the mask, beamline calorimeter, and first extraction quadrupole, encompassing a stripline interaction-point feedback system beam position monitor (BPM). The SLAC high-energy electron beam was used to irradiate the module in order to mimic the electromagnetic (EM) backgrounds expected in the ILC interaction region. The impact upon the performance of the feedback BPM was measured, and compared with detailed simulations of its expected response.
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Slides
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| THPMN079 |
Simulation of ILC Feedback BPM Signals in an Intense Background Environment
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2889 |
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- A. F. Hartin, P. Burrows, G. B. Christian, C. I. Clarke, B. Constance, H. D. Khah, C. Perry, C. Swinson, G. R. White
JAI, Oxford
- R. Arnold, S. Molloy, S. Smith, M. Woods
SLAC, Menlo Park, California
- A. Kalinin
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
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Funding: This work is supported in part by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.
Experiment T-488 at SLAC, End Station A recorded distorted BPM voltage signals and an accurate simulation of these signals was performed. Geant simulations provided the energy and momentum spectrum of the incident spray and secondary emissions, and a method via image charges was used to convert particle momenta and number density into BPM stripline currents. Good agreement was achieved between simulated and measured signals. Further simulation of experiment T-488 with incident beam on axis and impinging on a thin radiator predicted minimal impact due to secondary emission. By extension to worst case conditions expected at the ILC, simulations showed that background hits on BPM striplines would have a negligible impact on the accuracy of beam position measurements and hence the operation of the FONT feedback system
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