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WG1002 |
The Superconducting RF Photo-Injector at ELBE |
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- A. Arnold, H. Büttig, M. Justus, U. Lehnert, P. Michel, P. Murcek, Ch. Schneider, J. Teichert, R. Xiang
HZDR, Dresden, Germany
- T. Kamps, J. Rudolph
HZB, Berlin, Germany
- P. Kneisel
JLAB, Newport News, Virginia, USA
- I. Will
MBI, Berlin, Germany
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A superconducting RF photo-injector (SRF gun) has been installed at the ELBE linac. It is the first SRF gun which is in operation at an accelerator up to now. The SRF gun consists of a 3' cell, 1.3 GHz superconducting cavity with normal conducting photocathode in it. At present, the gun delivers electron bunches with kinetic energies of 3 MeV in CW mode and up to 4 MeV in pulsed mode operation. The Cs2Te photo cathodes used in the gun exhibit a very long life time, e.g. a cathode was in use for more than one year and delivers a charge of 35 C. A degradation of the cavity performance due the normal conducting photo cathode was not found. The electron beam delivered to ELBE was used for beam transport optimization, longitudinal parameter and slice emittance measurements. The performance of the gun is mainly limited by the low gradient of the present cavity. For that reason two new and slightly modified cavities have been fabricated and tested at JLab. The results of the vertical tests are very promising.
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Slides WG1002 [7.423 MB]
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WG1003 |
First Results of the SRF Gun Development for the BERLinPro ERL Project at HZB |
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- T. Quast, W. Anders, R. Barday, A. Jankowiak, T. Kamps, J. Knobloch, O. Kugeler, A.N. Matveenko, A. Neumann, S.G. Schubert, J. Völker
HZB, Berlin, Germany
- P. Kneisel
JLAB, Newport News, Virginia, USA
- R. Nietubyć
NCBJ, Świerk/Otwock, Poland
- J.K. Sekutowicz
DESY, Hamburg, Germany
- J. Smedley
BNL, Upton, Long Island, New York, USA
- I. Will
MBI, Berlin, Germany
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Funding: Work supported by Bundesministerium für Bildung und Forschung und Land Berlin. The work on the Pb cathode film is supported by EuCARD Grant Agreement No. 227579.
For the energy recovery linac (BERLinPro) at the Helmholtz-Zentrum-Berlin (HZB) a high brightness, high average current electron source is to be developed. As a first step an all superconducting radio-frequency (SRF) photoinjector is now in operation. The aim is to demonstrate electron beam produced from a Nb 1.6 cell superconducting gun with a Pb cathode coated on the cavity back wall. The setup of the source and first results from beam measurements are presented. An outlook on the final SRF photoinjector and its drive laser will be given.
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Slides WG1003 [2.844 MB]
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