Paper |
Title |
Page |
TPPT011 |
R&D Status of C-Band Accelerating Section for SuperKEKB
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1233 |
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- T. Kamitani, N. Delerue, M. Ikeda, K. Kakihara, S. Ohsawa, T. Oogoe, T. Sugimura, T. T. Takatomi, S. Yamaguchi, K. Yokoyama
KEK, Ibaraki
- Y. Hozumi
GUAS/AS, Ibaraki
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For future energy upgrade of the KEKB injector linac, C-band accelerating section has been developed. First prototype 1-m long section has been installed in the linac and has achieved the accelerating field gradient of 42 MV/m. Developments of second prototype which has thicker coupler iris and third prototype which has smooth surface of the iris are in progress for less frequent breakdown. This paper reports on the recent R and D status of these C-band accelerating sections.
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WPAP014 |
Development of Electron Gun of Carbon Nanotube Cathode
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1392 |
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- Y. Hozumi
GUAS/AS, Ibaraki
- M. Ikeda, S. Ohsawa, T. Sugimura
KEK, Ibaraki
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We are developing high brightness electron guns utilizing carbon nanotube (CNT) cathodes. Recently, we succeeded to achieved field emission currents to 0.2 A (3 A/cm2) from a triode type CNT cathode of 3 mm diameter. The emission tests were performed at DC100kV acceleration voltage in pulse operations of 50 Hz using 6 nsec pulses. The emission currents were very stable for long term periods of 3 weeks. Photo emission tests from CNT cathode by 266nm laser pulses is also due to be reported simultaneously.
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WPAP016 |
High Brightness Electron Gun for X-Ray Source
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1488 |
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- S. Ohsawa, M. Ikeda, T. Sugimura, M. Tawada
KEK, Ibaraki
- Y. Hozumi
GUAS/AS, Ibaraki
- K. Kanno
AET Japan, Inc., Kawasaki-City
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A new electron-gun system is under development in order to increase X-ray from a rotating target. In commercial X-ray sources electron beams usually hit targets at the outer part. Owing to deformation by centrifugal force, there has been a limit on electron beam intensities. In order to overcome this difficulty, we adopted a new injection system which strikes inside of a ring-shape projection on a rotating target. It has an advantage in that heated-up points have supports back side against centrifugal force. This merit allows us to raise electron beam to give stronger X-rays.
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