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Title |
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| WEOBB01 |
Single Micron Single-Bunch Turn-by-Turn BPM Resolution Achieved at NSLS-II |
2095 |
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- B. Podobedov, W.X. Cheng, K. Ha, Y. Hidaka, J. Mead, O. Singh, K. Vetter
BNL, Upton, Long Island, New York, USA
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NSLS-II state-of-the-art BPMs provide a single micron turn-by-turn BPM resolution for any bunch train of reasonable intensity. For certain beam dynamics studies a similar, or even better, resolution is desired for a single-, or a few-bunch fill, which is not yet available with our standard BPM signal processing. This paper describes our experience with more advanced BPM ADC signal processing which allowed us to significantly improve turn-by-turn BPM resolution in single bunch mode down to the level of about one micron at ~1 nC/bunch. We also present the examples of machine studies that benefit from this BPM performance enhancement.
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Slides WEOBB01 [2.565 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEOBB01
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| WEOBB02 |
Status of Wakefield Monitor Experiments at the CLIC Test Facility |
2099 |
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- R.L. Lillestøl, E. Adli, J. Pfingstner
University of Oslo, Oslo, Norway
- N. Aftab, S. Javeed
PINSTECH, Islamabad, Pakistan
- R. Corsini, S. Döbert, W. Farabolini, A. Grudiev, W. Wuensch
CERN, Geneva, Switzerland
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For the very low emittance beams in CLIC, it is vital to mitigate emittance growth which leads to reduced luminosity in the detectors. One factor that leads to emittance growth is transverse wakefields in the accelerating structures. In order to combat this the structures must be aligned with a precision of a few um. For achieving this tolerance, accelerating structures are equipped with wakefield monitors that measure higher-order dipole modes excited by the beam when offset from the structure axis. We report on such measurements, performed using prototype CLIC accelerating structures which are part of the module installed in the CLIC Test Facility 3 (CTF3) at CERN. Measurements with and without the drive beam that feeds rf power to the structures are compared. Improvements to the experimental setup are discussed, and finally remaining measurements that should be performed before the completion of the program are summarized.
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Slides WEOBB02 [2.928 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEOBB02
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| WEOBB03 |
A Non-destructive Profile Monitor Using a Gas Sheet |
2102 |
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- N. Ogiwara, Y. Hikichi, J. Kamiya, M. Kinsho, Y. Namekawa
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
- M. Fukuda, K. Hatanaka, T. Shima
RCNP, Osaka, Japan
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We are developing a dense gas-sheet target to realize a non-destructive and fast-response beam profile monitor for 3 GeV rapid cycling synchrotron (RCS) in the J-PARC. This time, to demonstrate the function of the gas sheet for measuring the 2 dimensional profiles of the accelerated beams, the following experiments were carried out: 1) The gas sheet with a thickness of 1.5 mm and the density of 2×10-4 Pa was generated by the combination of the deep slit and the thin slit. Here, the gas sheet was produced by the deep slit, and the shape of the sheet was improved by the thin slit. 2) For the electron beam of 30 keV with a diameter greater than 0.35 mm, the position and the two-dimensional profiles were well measured using the gas sheet. 3) Then the profiles of the 400 MeV proton beam with a current of 1×10-6 A was well measured, too.
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Slides WEOBB03 [4.718 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEOBB03
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