Title :
Improved ETA-II accelerator performance
Author :
Weir, J.T. ; Boyd, J.K. ; Chen, Y.J. ; Clark, J.C. ; Lager, D.L. ; Paul, A.C.
Author_Institution :
Lawrence Livermore Nat. Lab., CA, USA
Abstract :
Improvements have been made in the performance of the ETA-II accelerator that allow a nominal 2 kA, 6 MeV beam to be focused to a spot size less that 1 mm in diameter. The improvements include reducing the energy sweep to less than ±0.5% over 40 ns of the pulse using a real time energy diagnostic and improving the magnetic tune of the accelerator to reduce the emittance to 8 cm-mrad. Finally, an automated tuning system (MAESTRO) was run to minimize the time dependent centroid motion (corkscrew) by adjusting the steering dipoles over the focusing solenoids. The corkscrew motion was reduced to less than ±0.5 mm at the output of the accelerator
Keywords :
electron accelerators; electron beam focusing; linear accelerators; particle beam stability; 2 kA; 6 MeV; ETA-II accelerator performance; MAESTRO; automated tuning system; corkscrew motion; focusing solenoids; magnetic tune; real time energy diagnostic; steering dipoles; time dependent centroid motion; Coils; Computer bugs; Displays; Solenoids; Steering systems; Switched capacitor circuits; Switching circuits; Time of arrival estimation; Timing; Tuning;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792354
