Femtosecond response time measurements of a Cs 2 Te photocathode

A. Aryshev, M. Shevelev, Y. Honda, N. Terunuma, J. Urakawa

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Success in design and construction of a compact, high-brightness accelerator system is strongly related to the production of ultra-short electron beams. Recently, the approach to generate short electron bunches or pre-bunched beams in RF guns directly illuminating a high quantum efficiency semiconductor photocathode with femtosecond laser pulses has become attractive. The measurements of the photocathode response time in this case are essential. With an approach of the interferometer-type pulse splitter deep integration into a commercial Ti:Sa laser system used for RF guns, it has become possible to generate pre-bunched electron beams and obtain continuously variable electron bunch separation. In combination with a well-known zero-phasing technique, it allows us to estimate the response time of the most commonly used Cs2Te photocathode. It was demonstrated that the peak-to-peak rms time response of Cs2Te is of the order of 370 fs, and thereby, it is possible to generate and control a THz sequence of relativistic electron bunches by a conventional S-band RF gun. This result can also be applied for investigation of other cathode materials and electron beam temporal shaping and further opens a possibility to construct wide-range tunable, table-top THz free electron laser.

Original languageEnglish
Article number033508
JournalApplied Physics Letters
Volume111
Issue number3
DOIs
Publication statusPublished - 17 Jul 2017

Fingerprint

photocathodes
time measurement
electron beams
electrons
S band
time response
pulses
free electron lasers
illuminating
lasers
quantum efficiency
brightness
accelerators
interferometers
cathodes
estimates

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Femtosecond response time measurements of a Cs 2 Te photocathode. / Aryshev, A.; Shevelev, M.; Honda, Y.; Terunuma, N.; Urakawa, J.

In: Applied Physics Letters, Vol. 111, No. 3, 033508, 17.07.2017.

Research output: Contribution to journalArticle

Aryshev, A. ; Shevelev, M. ; Honda, Y. ; Terunuma, N. ; Urakawa, J. / Femtosecond response time measurements of a Cs 2 Te photocathode. In: Applied Physics Letters. 2017 ; Vol. 111, No. 3.
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