| Paper |
Title |
Page |
| MOPC043 |
Design of LINAC Based Compact X-ray Source via Inverse Compton Scattering at Waseda University
|
166 |
| |
- A. Masuda, T. Gowa, C. Igarashi, T. Kashino, N. Mitsuda, 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
|
|
| |
A table-top size soft X-ray source based on inverse Compton scattering has been developed at Waseda University. We have already succeeded in generating X-rays via inverse Compton scattering between 4.6 MeV electron beam generated from a photocathode RF-gun and 1047nm Nd:YLF laser. The energy of the X-ray is within the 'water window' region which can be applied for the soft X-ray microscope for biological observation. In 2007, new RF-gun cavity with Cs-Te photocathode in place of copper has been installed. The energy of electron beam became up to 5.5MeV due to the increase of Q-value of the gun cavity. According to this achievement, generated X-ray energies will cover overall the 'water window' region. We are planning a multi-pulse inverse Compton scattering X-ray generation system in order to enhance a luminous intensity of the X-rays. For this purpose, we are considering a multi-pulse UV laser system for generating a multi-bunch electron beam, the method for beam loading compensation, and the multi-pulse IR laser system for the Compton collisions. Experimental results of X-ray generation and multi-pulse X-ray plans will be presented at the conference.
|
|
| MOPP025 |
Design of the Beam Extraction by Using Strip-line Kicker at KEK-ATF
|
601 |
| |
- T. Naito, H. Hayano, K. Kubo, S. Kuroda, T. Okugi, N. Terunuma, J. Urakawa
KEK, Ibaraki
|
|
| |
The developing work of the strip-line kicker system for International linear collider(ILC) is carrying out at KEK*. To confirm the performance of the kicker system, the beam extraction test by using strip-line kicker is in progress at KEK-ATF. The multi-bunch beam, which has 2.8ns bunch spacing in the damping ring, is extracted from the damping ring to the extraction line with 308ns duration. The scheme is the same as the kicker of the ILC. The bump orbit and the auxiliary septum magnet will be used with the kicker to clear the geometrical restriction. The detail of the hardware design and the basic performance of each component are presented in this paper.
*T. Naito et al. Development of the Strip-line Kicker System for ILC Damping Ring, Proceedings of PAC07, Albuquerque, New Mexico, USA, pp2772-2274.
|
|
| MOPP066 |
Recent Experimental Study of Fast Ion Instability in ATF Damping Ring
|
697 |
| |
- N. Terunuma, Y. Honda, T. Naito, J. Urakawa
KEK, Ibaraki
- Eckhard. Elsen, G. X. Xia
DESY, Hamburg
|
|
| |
The Fast Ion Instability (FII) is one of the very high priorities of the damping ring R&D for the International Linear Collider (ILC). The Accelerator Test Facility (ATF) in KEK can provide an ILC damping ring-like beam. A specific FII study in ATF has been launched to characterize this phenomenon for the ILC damping ring. A new gas inlet system has been installed recently in the ATF damping ring to control the ion effect. After N2 gas injection into the vacuum chamber in south straight section of the ring, FII has been observed for elevated gas pressures. Beam size blow-up and emittance growth for various fill patterns are presented in this paper and attributed to FII. Comparison between experimental data and simulation results are given as well.
|
|
| MOPP078 |
Femtosecond Photocathode Electron Source
|
730 |
| |
- J. Yang, K. Kan, T. Kondoh, K. Tanimura, Y. Yoshida
ISIR, Osaka
- J. Urakawa
KEK, Ibaraki
|
|
| |
A photocathode-based low-emittance femtosecond-bunch electron source is developed to reveal the hidden dynamics of intricate molecular and atomic processes in materials through experimentation such as time-resolved pulse radiolysis or time-resolved electron diffraction. The transverse and longitudinal dynamics of femtosecond electron beam in a photocathode rf gun were studied. The growths of the emittance, bunch length and energy spread due to the rf and the space charge effects in the rf gun were investigated by changing the laser injection phase, the laser pulse width and the bunch charge. The beam simulation indicates that a sub-100-fs MeV electron source with the normalized transverse emittance of 0.1 mm-mrad and the relative energy spread of 10-4 at bunch charge of 0.1-1pC is achievable in the photocathode rf gun driven by a femtosecond laser light.
|
|
| TUOCM02 |
X-ray Monitor Based on Coded-aperture Imaging for KEKB Upgrade and ILC Damping Ring
|
1029 |
| |
- J. W. Flanagan, H. Fukuma, S. Hiramatsu, H. Ikeda, K.-I. Kanazawa, T. Mitsuhashi, J. Urakawa
KEK, Ibaraki
- J. P. Alexander
CLASSE, Ithaca
- M. A. Palmer
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
- G. S. Varner
UH, Honolulu, HI
|
|
| |
We present here design considerations for an x-ray monitor for high-resolution (a few um) and fast response (sub-nanosecond) for beam profile measurements to be used at an upgraded KEKB and/or ILC damping ring. The optics for the monitor are based on a technique borrowed from x-ray astronomy, coded-aperture imaging, which should permit broad-spectrum, low-distortion measurements to maximize the observable photon flux per bunch. Coupled with a high-speed digitizer system, the goal is to make sub-bunch-length, turn-by-turn measurements of beam profile and position.
|
|
|
Slides
|
|
| TUPP155 |
Compact EUV Source Based on Laser Compton Scattering between Micro-bunched Electron Beam and CO2 Laser Pulse
|
1869 |
| |
- S. Kashiwagi, G. Isoyama, R. Kato
ISIR, Osaka
- T. Gowa, A. Masuda, T. Nomoto, K. Sakaue, M. Washio
RISE, Tokyo
- R. Kuroda
AIST, Tsukuba, Ibaraki
- J. Urakawa
KEK, Ibaraki
|
|
| |
High-power extreme ultra-violet (EUV) sources are required for next generation semiconductor lithography. We start developing a compact EUV source in the spectral range of 13-14 nm, which is based on laser Compton scattering between a micro-bucnhed electron beam and a high intensity CO2 laser pulse. The electron beam extracted from a DC photocathode gun is micro-bunched using laser modulation techinque and a magnetic compressor before the main laser Compton scattering for EUV radiation. We will describe a considerating scheme for the compact EUV source based on laser Compton scattering with micro-bunched electron beam and the result of its numerical studies. A plan of test experiment generating micro-bunched electron beam will be also introduced in this conference.
|
|
| TUPP156 |
Development of a Compact X-ray Source Based on Laser-Compton Scattering with a Pulsed-laser Super-cavity
|
1872 |
| |
- 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
Kyoto University, Kyoto
|
|
| |
A compact and high quality x-ray source is required for various fields, such as medical diagnosis, drug manifacturing and biological sciences. Laser-Compton based x-ray source that consists of a compact electron storage ring and a pulsed-laser super-cavity is one of the solutions of a compact x-ray source. Pulsed-laser super-cavity has been developed at KEK-ATF for a compact high brightness x-ray source. The pulsed-laser super-cavity enables to make high peak power and small waist laser 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 2.5kW average power in our R&D. On the other hand, we have succeeded to stack the pulsed amplified laser in the super-cavity. This indicates that the number of X-ray is multiplied due to the gain in the amplification system to synchronize the pulsed pump to the beam. In view of this successful result, we have started an X-ray generation experiment using a super-cavity and a multi-bunch electron beam at KEK-LUCX. Development of the super-cavity and the results of X-ray generation experiment will be presented at the conference.
|
|
| MOPP074 |
Improvement of an S-band RF-gun cavity with a Cs-Te Photo-cathode
|
721 |
| |
- A. Murata, Y. Hama, T. Hirose, Y. Kato, K. Sakaue, T. Suzuki, M. Washio
RISE, Tokyo
- H. Hayano, N. Kudoh, T. T. Takatomi, N. Terunuma, J. Urakawa
KEK, Ibaraki
- Y. Kamiya
University of Tokyo, Tokyo
- S. Kashiwagi
ISIR, Osaka
- M. Kuriki
Hiroshima University, Graduate School of Science, Higashi-Hiroshima
- R. Kuroda
AIST, Tsukuba, Ibaraki
|
|
| |
A 1.6cell S-band photo-cathode RF-Gun is one of the good alternatives of the short pulse electron source. Therefore,we are operating as a high brightness short pulse electron source for studying a reaction of radiation chemistry,an inverse Compton scattering at Waseda University and as an injector at KEK-ATF. To improve an electron beam quality and to reduce a dark current,we decided to improve the RF-Gun cavity. Frequency tuning of the half cell of existing RF-gun was performed by the torque control of Helicoflex seal on the cathode plate and two moving rod type tuners were installed on the full cell. Newly designed RF-Gun cavity has four compact tuners on each cell,which can be tune the frequency to deform the cavity wall,to remove the Helicoflex seal and tuning holes that were considered to be the major cause of electric discharge and/or a dark current source. According to these improvements,the Q-value and shunt impedance of the cavity is 30% larger than that of existing guns. As the result,the reduction of dark current is succeeded and the beam energy is reached up to 5.5MeV at 10MW RF input. The detailed results of electron beam generation will be reported at the conference.
|
|
| TUPC011 |
Micron Size Laser-wire System at the ATF Extraction Line
|
1065 |
| |
- A. Aryshev, G. A. Blair, S. T. Boogert, G. E. Boorman, A. Bosco, L. Corner, L. Deacon, N. Delerue, B. Foster, F. Gannaway, D. F. Howell, V. Karataev, L. J. Nevay, M. Newman, R. Senanayake, R. Walczak
JAI, Oxford
- H. Hayano, N. Terunuma, J. Urakawa
KEK, Ibaraki
|
|
| |
The ATF extraction line laser-wire system has recently been upgraded allowing the measurement of micron scale transverse size electron beams. We report on the hardware upgrades, including focusing lens, laser and mechanical systems. First measurements using the new system from recent operation at the ATF in KEK are presented.
|
|
| THPC073 |
Measurement of Resonance Driving Terms in the ATF Damping Ring
|
3155 |
| |
- R. Tomas, F. Zimmermann
CERN, Geneva
- K. Kubo, S. Kuroda, T. Naito, T. Okugi, J. Urakawa
KEK, Ibaraki
|
|
| |
The measurement of resonance driving terms in the Damping Ring of the Accelerator Test Facility in KEK could help finding possible machine imperfections and even to optimize single particle stability through the minimization of non-linearities. The first experimental attempts of this enterprise are reported in this note.
|
|