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| TUPLT085 |
J-PARC Construction and its Linac Commissioning
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1351 |
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- Y. Yamazaki
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
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The J-PARC(Japan Proton Accelerator Research Complex) accelerator is under construction in JAERI Tokai site. The beam commissioning will be started there by the end of 2006. Prior to this, the front end of the linac was beam-commissioned in 2003 at KEK. The negative hydrogen beam with a peak current of 30 mA was accelerated up to 20 MeV by the first tank of three DTL's following the 3-MeV RFQ linac. The 324-MHz DTL contains the electro quadrupole magnets with water-cooling channels specially fabricated by means of electroforming and wire-cutting technologies. The construction status of the J-PARC accelerator is also presented.
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| THPKF039 |
Study of Photo-cathode RF Gun for a High Brightness Electron Beam
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2359 |
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- Y. Yamazaki
JNC/OEC, Ibaraki-ken
- S. Araki, H. Hayano, M. Kuriki, T. Muto, N. Terunuma, J. Urakawa
KEK, Ibaraki
- M.K. Fukuda, K. Hirano, M. Nomura, M. Takano
NIRS, Chiba-shi
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We are going to develop a compact high-brightness electron beam system to adopt industrial and medical applications. A multi-bunch photo-cathode RF gun has been developed to generate 100 bunches beam with 2.8ns spacing and 5nC charge per bunch. We will report details of the development, especially photo-cathode production and emission characteristics from cathode by the laser.
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| THPLT061 |
Development of a Multibunch Photo-cathode RF Gun System
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2625 |
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- J. Urakawa, M. Akemoto, S. Araki, H. Hayano, M. Kuriki, T. Muto, N. Terunuma, Y. Yamazaki
KEK, Ibaraki
- M.K. Fukuda, K. Hirano, M. Nomura, M. Takano
NIRS, Chiba-shi
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A multibunch photo-cathode RF gun system has been developed as a electron source for the production of quasi-monoenergetic X-rays based on inverse Compton scattering. This system consists of a photocathode rf gun, a cathode system, a laser system, beam diagnostic sections, and beam dump line. The gun produces 100 bunches with a 2.8ns bunch spacing and 5nC bunch charge. We will report on the RF gun system with 4 bending dipoles of a chicane which makes the laser injection to the cathode with perpendicular angle possible.
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| THPLT064 |
Enhancement of Laser Power from a Mode Lock Laser with an Optical Cavity
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2634 |
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- M. Nomura, K. Hirano, M. Takano
NIRS, Chiba-shi
- S. Araki, Y. Higashi, T. Taniguchi, J. Urakawa, Y. Yamazaki
KEK, Ibaraki
- Y. Honda, N. Sasao, K. Takezawa
Kyoto University, Kyoto
- H. Sakai
ISSP/SRL, Chiba
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We have developed a laser-wire beam monitor to measure a beam profile in the KEK/ATF damping ring. This monitor is based on the inverse Compton scattering with a thin wire of the laser. The laser-wire is produced with a Fabry-Perot optical cavity in which laser power from a CW laser is stored and enhanced up to 1000 times. We have a plan to increase a gamma ray flux by using a pulsed laser instead of the CW laser. There are many applications for such a high flux gamma ray, e.g. medical use, transmutation and so on. We have done a test experiment of laser pulse stacking with a mode lock laser where wavelength is 1064 nm, repetition rate 357MHz, pulse width 7psec(FWHM) and a 42 cm long Fabry-Perot optical cavity. The experimental results show that laser power in the optical cavity can be enhanced by laser pulse stacking.
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