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Title |
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| TUPMN049 |
Improvement of Soft X-ray Generation System Based on Laser Compton Scattering
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1031 |
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- T. Gowa, Y. Kamiya, A. Masuda, R. Moriyama, K. Sakaue, M. Washio
RISE, Tokyo
- H. Hayano, J. Urakawa
KEK, Ibaraki
- S. Kashiwagi
ISIR, Osaka
- R. Kuroda
AIST, Tsukuba, Ibaraki
- K. U. Ushida
RIKEN, Saitama
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Funding: This work is supported by MECSST High Tech Research Center Project No. 707 and JSPS (B) (2) 18340079.
At Waseda University, we have succeeded in generating soft X-rays based on laser Compton scattering. The energies are within "Water Window" part (250~500eV) where the X-ray absorption coefficient of water is much less than that of constituent elements of living body such as carbon, hydrogen and nitrogen. For this reason, it is expected to apply to a bio-microscope with which we can observe living cells without dehydration. To improve the generation system, we remodeled our collision chamber and adopted 3-pass flash lamp amplifier system. With these modifications, we achieved high S/N ratio. The photon number detected by MCP was 278/pulse, tenfold increase of that in last year. Moreover, we succeeded in generating soft X-rays stably for more than 10 hours. Now we are planning to measure two-dimensional distribution of the X-rays by CCD. In this conference, experimental results and future plans will be reported.
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| WEPMN027 |
Construction of the Baseline SC Cavity System for STF at KEK
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2107 |
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- E. Kako, H. Hayano, S. Noguchi, T. Shishido, K. Watanabe, Y. Yamamoto
KEK, Ibaraki
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Construction of STF (Superconducting RF Test Facility) is being carried out at KEK. Four-cavity system including 9-cell baseline cavities (TESLA-type), input couplers and frequency tuners has been developed and will be installed in a 6 m cryomodule. The peculiarity of the STF baseline cavity system is a very stiff design in a jacket and tuner system, which can relax the effect of Lorentz detuning in a pulsed operation. Performance tests of four 9-cell cavities have been carried out repeatedly in a vertical cryostat, and the attained accelerating gradients reached to about 20 MV/m with no field emission in each cavity. High power input couplers with two planar rf windows were fabricated, and the rf processing test with a pulsed klystron was successfully carried out up to 1.0 MW with 1.5 msec and 5 Hz without any troubles. Assembly of the cryomodule including one 9-cell baseline cavity had completed (STF phase 0.5), and the first cool-down test is scheduled in March, 2007.
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| THPMN028 |
Development of the Strip-line Kicker System for ILC Damping Ring
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2772 |
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- T. Naito, H. Hayano, K. Kubo, M. Kuriki, N. Terunuma, J. Urakawa
KEK, Ibaraki
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The performance of the kicker system for the International Linear collider(ILC) is the one of the key component to determine the damping ring(DR) circumference and the train structure. The parameters are discussing at the baseline configuration design for the ILC. The bunch trains in the linac are 2820(5640) bunches with 308(154) ns spacing and the repetition rate is 5Hz. The bunch spacing in the DR is 6(3) ns. The kicker has to have fast rise and fall times of 6(3) ns and the repetition rate of 3.25(6.5) MHz. The development work of the kicker system using multiple strip-lines is carried out at KEK-ATF. The beam test result of the single unit is described. Also Experimental results on new scheme to improve the rise and fall times will be presented.
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| THOAC01 |
ATF Extraction Line Laser-Wire System
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2636 |
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- L. Deacon, G. E. Boorman, L. Deacon
Royal Holloway, University of London, Surrey
- A. Aryshev, H. Hayano, K. Kubo, N. Terunuma, J. Urakawa
KEK, Ibaraki
- G. A. Blair, S. T. Boogert, A. Bosco, L. Corner, N. Delerue, F. Gannaway, D. F. Howell, V. Karataev, M. Newman, A. Reichold, R. Senanayake, R. Walczak
JAI, Oxford
- B. Foster
OXFORDphysics, Oxford, Oxon
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Funding: PPARC LC-ABD Collaboration Royal Society Daiwa Foundation Commission of European Communities under the 6th Framework Programme Structuring the European Research Area, contract number RIDS-011899
The ATF extraction line laser-wire (LW) aims to achieve a micron-scale laser spot size and to verify that micron-scale beam profile measurements can be performed at the International Linear Collider beam delivery system. Recent upgrades to the LW system are presented together with recent results including the first use of the LW as a beam diagnostic tool.
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Slides
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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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