P-6: Pulsed Dipole

Principle Investigator:
Stephan Wesch

Contact in absentia:
Bernhard Schmidt

Description and goals:
The FLASH linac is able to feed two beamlines, FLASH1 and FLASH2, by separating the 800 μs RF flat-top into bunch trains in time and space by a combination of fast kicker magnets and a septum. Daily parallel operation of the SASE beamlines is commonplace since 2013. By adding a 3rd beamline, FLASHForward, in the FLASH2 tunnel financial and space constraints prohibit a similar design of the separation of the FLASH2 and the FLASHForward electron bunches.

At present two static dipoles are installed, switching between FLASH2 or FLASHForward mode. This limits the operation of FLASHForward to either dedicated FLASH study periods, scheduled a few times a year, or when FLASH2 user runs are not scheduled. To increase the uptime, a compact pulsed dipole system, which has been developed in the last years, will replace the two states dipoles. Two subsequent pulsed magnets produce a half-sine kicker profile with ca. 125 μs rise-time enabling the injection of up to 2 bunches into the FLASHForward beamline with a total deflection angle of 8 deg at maximum 1.6 GeV beam energy and 10 Hz repetition rate.

In past studies the magnet field parameters have been verified successfully. The next step is to test the system in continuous operation, with installation in the FLASH beamline infrastructure planned for 2019.