Speaker
Description
The pulsed linac at EuXFEL, operated by DESY, is de-signed to deliver up to 2700 electron bunches during a beam delivery time of 600 µs within an RF flat-top time of 650 µs. The user community would like to have more photon pulses. This can be done only by increasing RF flat-top length. The whole RF pulse length at the linac is limited by several factors, primarily the RF pulse length in the existing photoinjector. The new RF photoinjector, currently under development and testing, will enable beam pulses of up to 800 µs. The second limiting factor could be the stability of the RF power sources, the klys-trons, which must handle longer high-voltage and RF pulses. Other very important parts are the accelerating cavities and RF fundamental couplers, which must handle higher power during cavity filling and a longer RF flat-top time. Initial investigations into extending the RF flat-top length began in 2022. Recently, various measures have been developed and implemented to increase the RF flat-top length while keeping power consumption low without compromising linac performance. These include optimizing the klystron high-voltage (HV) waveform, the high-power RF pulse shape, and the coupling factors of the accelerating cavities. The latest results from the tests of several RF stations with a beam delivery time of 800 µs are presented
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