Author: Schaber, J.
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WEPNEC09
Thz User Operation With 200 pC CW Beam Generated by the ELBE SRF Gun II  
 
  • A. Arnold, S. Ma, P. Murcek, J. Schaber, J. Teichert, R. Xiang, P.Z. Zwartek
    HZDR, Dresden, Germany
 
  Funding: The work was partly supported by the German Federal Ministry of Education and Research (BMBF) grant 05K12CR1 and Deutsche Forschungsgemeinschaft (DFG) project (XI 106/2-1)
As a new electron source with higher brilliance, the second superconducting RF photoinjector (SRF Gun II) has been built at the ELBE radiation center for high power radiation sources. One of the main goals of SRF gun II is to achieve a higher bunch charge (>200 pC) and lower emittance (3 mm mrad) than the present ELBE thermionic DC gun. SRF Gun II features a 3.5-cell niobium cavity as well as a superconducting solenoid in the same cryomodule. With Mg photocathodes the gun is able to provide medium current beam with bunch charge of more than 200 pC and sub-ps bunch length at 100 kHz repetition rate. With this contribution we present convincing results from long-term user operation of SRF gun II in combination with the bunching concept of the ELBE accelerator in order to produce THz radiation with much higher stability and power than available using the existing thermionic gun.
 
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THCOYBS01 Metal and Semiconductor Photocathodes in HZDR SRF Gun 142
 
  • R. Xiang, A. Arnold, P. Murcek, J. Schaber, J. Teichert
    HZDR, Dresden, Germany
  • J. Schaber
    TU Dresden, Dresden, Germany
 
  Funding: The work is supported by the German Federal Ministry of Education and Research (BMBF) grant 05K12CR1.
Quality of photocathode in a photoinjector is one of the critical issues for the stability and reliability of the whole accelerator facility. In April 2013, the IR FEL lasing was demonstrated for the first time with the electron beam from the SRF gun with Cs2Te at HZDR. Cs2Te photocathode worked in SRF gun-I for more than one year without degradation. Currently, Mg photocathodes with QE up to 0.5% are applied in SRF Gun-II, generating e- beam with bunch charge up to 300 pC in CW mode with sub-ps bunch length for the high power THz radiation. It is an excellent demonstration that SRF guns can work reliably in a high power user facility.
 
slides icon Slides THCOYBS01 [3.868 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-THCOYBS01  
About • paper received ※ 18 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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