| Paper |
Title |
Page |
| TUPMN050 |
Development of Pulsed-Laser Super-Cavity for Compact X-Ray Source Based on Laser-Compton Scattering
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1034 |
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- K. Sakaue, M. Washio
RISE, Tokyo
- S. Araki, M. K. Fukuda, Y. Higashi, Y. Honda, T. Taniguchi, N. Terunuma, J. Urakawa
KEK, Ibaraki
- N. Sasao, H. Yokoyama
Kyoto University, Kyoto
- M. Takano
Tsukuba-shi, Ibaraki-ken
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A compact and high quality x-ray source is required from various field, such as medical diagnosis, drug manifacturing and biological sciences. Laser-Compton based x-ray source that consist of a compact electron storage ring and a pulsed-laser super-cavity is one of the solutions of compact x-ray source. Pulsed-laser super-cavity has been developed for a compact high brightness x-ray sources at KEK-ATF. The pulsed-laser super-cavity increases the laser power and stably makes small laser beam size at the collision point with the electron beam. Recently, 357MHz mode-locked Nd:VAN laser pulses can be stacked stably in a 420mm long Fabry-Perot cavity with 1'000 enhancement in our R&D. Therefore, we have planned a compact hard x-ray sources using 50MeV multi-bunch electrons and a pulse stacking technology with 42cm Fabry-Perot cavity. (LUCX Project at KEK) The photon flux is multiplied with the number of bunches by using multi-bunch beam and super-cavity. Development of the super-cavity and present result of LUCX will be presented at the conference.
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| FRPMN054 |
The Design Study of IP-BPM for the ILC
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4120 |
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- S. H. Shin, E.-S. Kim, H.-S. Kim
Kyungpook National University, Daegu
- Y. Honda, J. Urakawa
KEK, Ibaraki
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Beam position monitors (BPMs) with a resolution in a few nanometers range are required to control beams in the locations that are close to the interaction point (IP) of the International Linear Collider (ILC). ATF2 at KEK has considered as a test facilitiy to investigate this requirement. We have performed the design study for IP-BPM by using of the electromagnetic simulation program MAFIA and HFSS. The designed IP-BPM consists of one cell sensor cavity and one cell reference cavity. The results of the design studies showed signal decay time of 20 ns and orbit sensitivity of a few nm. The signal voltage from sensor cavity showed increasing of a factor of 3 and 2 in horizontal and vertical directions, respectively, than the IP-BPM that was installed ATF extraction beam line. We present the results of design studies in which include effects of common mode contamination in the IP-BPM.
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| FRPMS049 |
Resolution of a High Performance Cavity Beam Position Monitor System
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4090 |
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- S. Walston, C. C. Chung, P. Fitsos, J. Gronberg
LLNL, Livermore, California
- S. T. Boogert
Royal Holloway, University of London, Surrey
- J. C. Frisch, S. Hinton, J. May, D. J. McCormick, S. Smith, T. J. Smith, G. R. White
SLAC, Menlo Park, California
- H. Hayano, Y. Honda, N. Terunuma, J. Urakawa
KEK, Ibaraki
- Yu. G. Kolomensky, T. Orimoto
UCB, Berkeley, California
- P. Loscutoff
LBNL, Berkeley, California
- A. Lyapin, S. Malton, D. J. Miller
UCL, London
- R. Meller
Cornell University, Department of Physics, Ithaca, New York
- M. C. Ross
Fermilab, Batavia, Illinois
- M. Slater, M. Thomson, D. R. Ward
University of Cambridge, Cambridge
- V. Vogel
DESY, Hamburg
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International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will be as small as a few nanometers. It is important to the ILC design effort to demonstrate that these tolerances can be achieved – ideally using beam-based stability measurements. It has been estimated that RF cavity beam position monitors (BPMs) could provide position measurement resolutions of less than one nanometer and could form the basis of the desired beam-based stability measurement. We have developed a high resolution RF cavity BPM system. A triplet of these BPMs has been installed in the extraction line of the KEK Accelerator Test Facility (ATF) for testing with its ultra-low emittance beam. A metrology system for the three BPMs was recently installed. This system employed optical encoders to measure each BPM's position and orientation relative to a zero-coefficient of thermal expansion carbon fiber frame and has demonstrated that the three BPMs behave as a rigid-body to less than 5 nm. To date, we have demonstrated a BPM resolution of less than 20 nm over a dynamic range of ± 20 microns.
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