| Paper |
Title |
Page |
| TUPPH044 |
Investigation of Quadrupole Magnets for the XFEL Project Using a Rotating Coil Set-up
|
345 |
| |
- F. Hellberg, H. Danared, A. Hedqvist
MSL, Stockholm
- Y. Holler, B. Krause, A. Petrov, J. Pflueger
DESY, Hamburg
|
|
| |
In the European X-ray free electron laser (XFEL) undulators quadrupole magnets focus the electron beam. The magnetic centre of these quadrupoles must be within 0.002 mm (rms) distance from a straight line over the length of an undulator. This can only be achieved with beam based alignment (BBA). For BBA to work, it is essential that changes of field strength do not significantly change the position of the magnetic centre of the quadrupole. Also, temperature stability of the position of the magnetic center is important. To investigate magnet excitation effects and sensitivity to temperature changes, a rotating coil system has been setup at the Manne Siegbahn Laboratory to measure the stability of the magnetic centre with accuracy better than 0.001 mm. This instrument was used to investigate the properties of several magnet yokes of different materials, solid and laminated, for the XFEL quadrupoles.
|
|