Successful user operation of a superconducting radio-frequency photoelectron gun with Mg cathodes

At the electron linac for beams with high brilliance and low emittance (ELBE) center for high-power radiation sources, the second version of a superconducting radio-frequency (SRF) photoinjector has been put into operation and has been routinely applied for user operation at the ELBE electron accele...

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Published inPhysical review. Accelerators and beams Vol. 24; no. 3; p. 033401
Main Authors Teichert, J., Arnold, A., Ciovati, G., Deinert, J.-C., Evtushenko, P., Justus, M., Klopf, J. M., Kneisel, P., Kovalev, S., Kuntzsch, M., Lehnert, U., Lu, P., Ma, S., Murcek, P., Michel, P., Ryzhov, A., Schaber, J., Schneider, C., Schurig, R., Steinbrück, R., Vennekate, H., Will, I., Xiang, R.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.03.2021
Subjects
Continuous radiation
Electron beams
Electron pulses
Emittance
Kinetic energy
Liquid nitrogen
Niobium
Photocathodes
Photoelectrons
Quantum efficiency
Radiation
Radiation sources
Solenoids
Superconductivity
Support systems
Terahertz frequencies
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Summary:At the electron linac for beams with high brilliance and low emittance (ELBE) center for high-power radiation sources, the second version of a superconducting radio-frequency (SRF) photoinjector has been put into operation and has been routinely applied for user operation at the ELBE electron accelerator. SRF guns are suitable for generating a continuous wave electron beam with high average currents and high beam brightness. The SRF gun at ELBE has the goal to generate short electron pulses with bunch charges of 200–300 pC at typical repetition rates of 100 kHz for the production of superradiant, coherent terahertz radiation. The SRF gun includes a 3.5-cell, 1.3-GHz niobium cavity and a superconducting solenoid. A support system with liquid nitrogen (LN2) cooling allows the operation of normal-conducting, high quantum efficiency photocathodes. We present the design and performance of the SRF gun as well as beam measurement results of the operation with Mg photocathodes at an acceleration gradient of8MV/m(4 MeV kinetic energy). In the last section, we discuss the SRF gun application for production of coherent terahertz radiation at the ELBE facility.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.24.033401