Title :
Design, manufacturing and first measurements of a hybrid permanent magnet undulator for free electron laser
Author :
Rosatelli, F. ; Barbagelata, L. ; Crenna, F. ; Grattarola, M. ; Gualco, G. ; Matrone, A. ; Ottonello, G.B. ; Ciocci, F. ; Renieri, A.
Author_Institution :
Ansaldo Ricerche, Genova, Italy
Abstract :
The hybrid permanent magnet undulator for the LISA-FEL (free electron laser) experiment (INFN, Frascati, Italy) has been designed and manufactured. A computerized driving system has been developed in order to lighten the mechanical structure and gain accuracy in positioning of the jaws during gap variation. The NdFeB permanent magnet blocks have been measured and sorted in order to reduce magnetic field errors along the undulator axis. The field integrals are minimized by the electronic control, which feeds the correction coils with a gap-dependent current. The first results of mechanical tests and magnetic field measurements confirm the good performance and reliability of the device.<>
Keywords :
electron accelerators; free electron lasers; permanent magnets; wigglers; LISA-FEL; NdFeB; computerized driving system; correction coils; free electron laser; hybrid permanent magnet undulator; magnetic field errors; mechanical tests; performance; reliability; Coils; Computer errors; Feeds; Free electron lasers; Magnetic field measurement; Manufacturing; Optical design; Permanent magnets; Testing; Undulators;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.165094
