Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Beschleunigerphysik X (Injektoren)
HK 48.7: Talk
Tuesday, March 5, 2013, 18:15–18:30, WIL-C205
Optimization of the longitudinal phase space distribution of a 20 pC e-bunch at the RF-gun exit for quasi single spike operation at the European XFEL — Barbara Marchetti1, Mikhail Krasilnikov1, Frank Stephan1, and •Igor Zagorodnov2 — 1DESY, Zeuthen, Germany — 2DESY, Hamburg, Germany
The production of ultra-short (fs or sub-fs long), high power, radiation pulses in the X-ray spectral region, represents a challenge for many existent SASE FELs. In order to realize single spike lasing the length of the electron bunch after compression must be extremely small (less than a micrometer) thus it is necessary to tune the linac and magnetic compressors at the maximum compression point. In this setup, the final length of the e-bunch strongly depends on the non-linearity in its longitudinal phase space. The use of a third harmonic RF cavity placed right after the injector is foreseen at the European XFEL in order to correct the longitudinal phase space non-linearity up to the third order. In this paper we compare the compression of different longitudinal phase space distributions of a 20 pC e-bunch at the gun exit in terms of final e-bunch length, peak current, energy spread and RF-tolerance.