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A transverse kick which results from the coaxial RF coupler in the L-band RF gun at the Photo Injector Test facility at DESY in Zeuthen (PITZ) has been modeled and characterized. The used RF pulse is typically 600 μs long and used to produce a train of up to 2700 electron bunches. The kick is transient and found to be dependent on the detuning of the resonance frequency of the gun cavity. The frequencydetuning within the RF macro-pulse results in a variation in the kick strength along the pulse. This leads to a downstream orbit and size change of individual bunches within the train. Using 3D RF field distributions, calculated at detuned frequencies of the cavity, particle tracking simulations are performed to simulate the behavior of the transient kick onto the electron bunch. The temperature of the cooling water for the gun is tuned, allowing detailed characterization of the frequency-detuning within the RF pulse and thereby measurements of the kick which are of practical interest. Systematic measurements of the kick along the bunch train have meanwhile been carried out. The results will be presented and discussed.

physical review. accelerators and beams

Frequency-detuning dependent transient coaxial rf coupler kick in an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math> -band long-pulse high-gradient rf photogun

Frequency-detuning dependent transient coaxial rf coupler kick in an L -band long-pulse high-gradient rf photogun