| 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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| 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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| THPMN040 |
Development of an S-band Cs2Te-Cathode RF Gun with New RF Tuners
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2808 |
| |
- Y. Kamiya, Y. Kato, A. Murata, K. Sakaue, M. Washio
RISE, Tokyo
- N. Kudoh, M. Kuriki, T. T. Takatomi, N. Terunuma, J. Urakawa
KEK, Ibaraki
- R. Kuroda
AIST, Tsukuba, Ibaraki
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We have been studying an S-band Cs2Te-Cathode RF Gun with 1.6 cells. The new gun cavity reported in this poster has new RF tuners, which are compact and, therefore, can be attached even on the half-cell. RF balance between the full- and half-cells is adjustable by using the tuners on both cells. Compared to the existing cavity, a Helicoflex seal for half-cell adjustment is not needed for new one. This structure is expected to have advantages for gun machining, for Q factor of the cavity, and for reduction of dark current from the RF gun. The cathode is made by evaporation on a Mo plug, and the plug is attached by a load lock system. We report status of the gun development.
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| THOAC01 |
ATF Extraction Line Laser-Wire System
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2636 |
| |
- 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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| THPAN038 |
Generation and Acceleration of High Brightness Electron Bunch Train in ATF of KEK
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3312 |
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- S. Liu, S. Araki, M. K. Fukuda, M. Takano, N. Terunuma, J. Urakawa
KEK, Ibaraki
- K. Hirano
NIRS, Chiba-shi
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Laser Undulator Compact X-ray source (LUCX) is a test bench for compact high brightness X-ray generator at KEK in order to demonstrate the possibility on K-edge digital subtraction angiography, based on the Compton Scattering. For this project, one of the challenging problems is to generate and accelerate high brightness multi-bunch electron beams, compensating the energy difference due to beam loading effect. In this paper, we calculate the transient beam loading voltage and energy gain from RF field in standing wave gun cavity and traveling wave accelerating tube for multi-bunch train, considering the process of propagation, buildup of RF field in them and the special RF pulse shape. We generated and accelerated 100 bunch electron beam train with 50nC, which beam loading effect was compensated effectively by adjusting the laser injection timing. By BPM and OTR system, we measured the electron beam energy bunch by bunch. The average energy of 100 bunch train is 40.5MeV and maximum energy difference bunch to bunch is 0.26MeV, the relative energy spread of single bunch is about 0.13%. The transverse emittance can be optimized roughly to 3.6 pimm.mrad.
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| FRPMS049 |
Resolution of a High Performance Cavity Beam Position Monitor System
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4090 |
| |
- 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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