| Paper | Title | Page |
|---|---|---|
| TUPPH006 | Diagnostic Tools for the Undulator System of the Seeded HGHG-FEL at MAX-lab | 243 |
|
||
| Within the EUROFEL Design Study a one stage seeded HGHG FEL has been set up at the MAX-lab injection linac. BESSY has built the undulator system consisting of a modulator, a radiator and an electromagnetic chicane. BESSY also provided various diagnostic tools including Cherenkov glass fibres, powermeter glass fibres and THz detectors. After installation the undulators have been measured in the final position with a pulsed wire and residual field integrals have been compensated with air coils. During first injections with the laser driven rf-gun the Cherenkov system has delivered detailed spatial information on the losses of electrons within the beamline. The powermeter system which provides information on absolute doses deposited in the permanent magnets has collected data over half a year and the high sensitivity and low drift of the system has been demonstrated. Two types of THz detectors have been used close to the electron beam dump giving information on the electron bunch compression and on the seed laser induced beam energy modulation. We will report on the measurements taken with the diagnostic tools mentioned above. |