Title :
High-power test of thermionic RF-gun at the Pohang Accelerator Laboratory
Author :
Kang, H.S. ; Kim, G.N. ; Cho, M.H. ; Ko, I.S. ; Namkung, W. ; Chung, K.H.
Author_Institution :
Pohang Accel. Lab., South Korea
fDate :
8/1/1997 12:00:00 AM
Abstract :
A one-cell RF-gun with a dispenser cathode was fabricated for high-brightness applications at the Pohang Accelerator Laboratory. The gun was designed to withstand heavy beam loading and breakdown for long-pulse operation. After some RF-conditioning, the gun could be powered up to a nominal RF-power of 3.5 MW during 6 μs. The gun produced an electron beam with an average current of 300 mA and energy up to 1 MeV, normally operated with a 6-μs macropulse and 12-Hz repetition rate. The beam loading and the energy spectra were measured to confirm the gun´s performance. The beam emittance was measured and compared with simulation results. The breakdown problem due to the field-emitted electrons and the backward electrons in the gun is discussed
Keywords :
accelerator RF systems; electron accelerators; electron beams; electron guns; electron sources; particle beam diagnostics; storage rings; thermionic electron emission; 1 MeV; 12 Hz; 300 mA; Pohang Accelerator Laboratory; Pohang Light Source; RF-conditioning; backward electrons; beam emittance; beam loading; breakdown problem; dispenser cathode; electron beam; energy spectra; field-emitted electrons; high-brightness applications; high-power test; long-pulse operation; one-cell RF-gun; thermionic RF-gun; Cathodes; Electric breakdown; Electron beams; Laboratories; Life estimation; Light sources; Linear particle accelerator; Materials science and technology; Storage rings; Testing;
Journal_Title :
Nuclear Science, IEEE Transactions on
