S. OKUDA, T. YAMAMOTO, S. SUEMINE, G. ISOYAMA (ISIR)
The high-intensity single-bunch electron beams are generated with the 38 MeV L-band (1300 MHz) linac [1] at The Institute of Scientific and Industrial Research (ISIR) in Osaka University. The electron beams are being applied to exciting matters in a short period and to generating high-intensity coherent radiation in far-infrared regions. The linac is equipped with a high-current thermionic gun [2], three subharmonic prebunchers (two operated at 108 MHz and one at 216 MHz) and two bunchers at the fundamental frequency. Electron beams are injected from the gun at a pulse width of 5 ns in FWHM. The maximum peak current of the beam is 30.1 A for an anode voltage of 100 kV. The maximum charge of electrons in a bunch of the accelerated beam is 81 nC at an energy of 27 MeV. The bunch lengths measured with a streak camera are 20-30 ps in FWHM and the energy spread of the beam is 0.8-2.5% in FWHM. The normalized emittance of the beam is 130 paimm@mrad at a charge of 34 nC/bunch.
[1] S. Okuda, Y. Honda, N. Kimura, J. Ohkuma, T. Yamamoto, S. Suemine, T. Okada, S. Takeda, K. Tsumori and T. Hori, Nucl. Instr. and Meth. A358 (1995) 248.
[2] S. Okuda, T. Yamamoto, S. Suemine and S. Tagawa, Nucl. Instr. and Meth. A417 (1998) 210.
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