A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Kuroda, R.

Paper Title Page
MOOAC02 A Short-Pulse Hard X-ray Source with Compact Electron LINAC Via Laser-Compton Scattering for Medical and Industrial Radiography 121
 
  • H. Toyokawa, H. Ikeura-Sekiguchi, M. K. Koike, R. Kuroda, H. Ogawa, N. Sei, M. Tanaka, K. Y. Yamada, M. Y. Yasumoto
    AIST, Tsukuba, Ibaraki
  • T. Nakajyo, F. Sakai, T. Y. Yanagida
    SHI, Tokyo
 
  An intense, quasi-monochromatic hard X-ray beam has been generated via the laser-Compton scattering of a picosecond electron bunch with an intense femtosecond TW laser. A s-band linear accelerator of 40 MeV and Ti:Sa femtosecond TW laser were used to generate X-rays. We plan to increase the X-ray yield up to two-orders than the current one until FY2008. Our recent R&D for that purpose are generation of multi-pulse electron beam using a photo-cathode rf-gun, and multi-pulse laser cavity for Compton scattering. We briefly describe the specifications of the electron accelerator and the laser systems, together with the developments and modifications being undergone.  
slides icon Slides  
TUPMN047 W-band Electromagnetic Wave Undulator for AIST 800 MeV Electron Storage Ring TERAS 1025
 
  • H. Toyokawa, R. Kuroda
    AIST, Tsukuba, Ibaraki
  • H. Ohgaki
    Kyoto IAE, Kyoto
 
  An electromagnetic-wave undulator based on a quasi-optical resonator operated in higher order TE mode is proposed to generate monochromatic X-rays. We plan to install it to an 800MeV electron storage ring TERAS of AIST. Mode propagation in the resonator was analysed with an electromagnetic-wave simulation code MAFIA and HFSS. Design parameters for the undulator operated in W-band (95 GHz) was presented. The peak electric field along the electron orbit was estimated to be 130 kV/m when we fed 1 kW of 95 GHz electromagnetic wave. The estimated X-ray flux density was 1 x 1011 photons/sec/mrad2/A for 3.4 keV X-rays.  
TUPMN049 Improvement of Soft X-ray Generation System Based on Laser Compton Scattering 1031
 
  • 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
 
  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.

 
TUPMN051 Development of Photocathode RF Gun and Laser System for Multi-collision Laser Compton Scattering 1037
 
  • R. Kuroda, M. K. Koike, H. Ogawa, N. Sei, H. Toyokawa, K. Y. Yamada, M. Y. Yasumoto
    AIST, Tsukuba, Ibaraki
  • T. Gowa, Y. Kamiya, A. Masuda, R. Moriyama, K. Sakaue, M. Washio
    RISE, Tokyo
  • S. Kashiwagi
    ISIR, Osaka
  • T. Nakajyo, F. Sakai, T. Y. Yanagida
    SHI, Tokyo
 
  A compact soft and hard X-ray source via laser Compton scattering is required for biological, medical and industrial science because it has many benefits about generated X-rays such as short pulse, quasi-monochromatic, energy tunability and good directivity. Our X-ray source is conventionally the single collision system between an electron pulse and a laser pulse. To increase X-ray yield, we have developed a multi-collision system with a multi-bunch electron beam and a laser optical cavity. The multi-bunch beam will be generated from a Cs-Te photocathode rf gun sytem using a multi-pulse UV laser. The laser optical cavity will be built like the regenerative amplification including a collision point between the electron pulse and the laser pulse to enhance the laser peak power per 1 collision on laser Compton scattering. In this conference, we will describe the results of preliminary experiments for the multi-collision system and future plans.  
THPMN037 Development of Compact EUV Source based on Laser Compton Scattering 2799
 
  • S. Kashiwagi, R. Kato, J. Yang
    ISIR, Osaka
  • R. Kuroda
    AIST, Tsukuba, Ibaraki
  • K. Sakaue, M. Washio
    RISE, Tokyo
  • J. Urakawa
    KEK, Ibaraki
 
  High-power extreme ultraviolet (EUV) source is required for next generation semiconductor lithography. We start to develop a compact EUV source in the spectral range of 13-14 nm, which is based on laser Compton scattering between a 7 MeV electron beam and a high intensity CO2 laser pulse. Electron beam is pre-bunched using two different wavelengths of laser pulses with a dispersion section of beam transport line*,**. In this conference, we describe the results of numerical study for the EUV source and a plan of test experiment generating micro-bunched electron beam.

*M. Goldstein et al., Proc. of the 27th Int. FEL conference, Stanford, California, USA (2005) pp.422-425**A. Endo, Sematic EUV source workshop, Barcelona, Spain (2006)

 
THPMN040 Development of an S-band Cs2Te-Cathode RF Gun with New RF Tuners 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
 
  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.