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THOALH02 |
Development of the Non-invasive Beam-size Monitor using ODR
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256 |
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- T. Muto, S. Araki, H. Hayano, V. Karataev, N. Terunuma, J. Urakawa
KEK, Ibaraki
- R. Hamatsu
TMU, Hatioji-shi,Tokyo
- A. Naumenko, A.P. Potylitsyn
Tomsk Polytechnic University, Physical-Technical Department, Tomsk
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The beam-size monitor based on Optical Diffraction Radiation (ODR) has been developed at the KEK-ATF. Because of its non-invasive nature, the ODR monitor might be one candidate to measure the extreme-low emittance electron beam for future LC?s and x-ray free electron lasers. To evaluate the beam-size, the angular distribution of the ODR emitted by the beam when crossing a slit in a metallic foil was measured. In the first trial, we observed interference patterns between ODR and backgrounds which may be the synchrotron radiation from most nearest bending magnet at the ATF extracted line. By the installation of the ceramic mask in front of our target, this interference was vanished. And comparing with the result of ODR measurements, we installed the wire scanner in the same position of our monitor. In this paper, we will present developments of the ODR monitor with some experimental results.
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Video of talk
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Transparencies
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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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