Title :
Improvement of the time structure and reproducibility of the Bevalac spill
Author :
Celata, C.M. ; Bennett, M.J. ; Cowles, D.N. ; Feinberg, B. ; Frias, Robert ; Nyman, M.A. ; Stover, G.D. ; Tekawa, M.M. ; Salomons, R.
Author_Institution :
Lawrence Berkeley Lab., California Univ., CA, USA
Abstract :
The time structure of the Bevalac beam spill has been measured for spills with and without feedback. A filter across the magnet has reduced spill ripple near 170 Hz. Low-frequency spill structure has been improved by removing the scintillator used for feedback from the vacuum chamber, detecting instead radiation generated by collisions of beam particles with a wire chamber. Pulse-to-pulse variation of the circulating beam intensity has been reduced, and continuous tunability of the intensity introduced, by using a feedback system. This system reduces the RF bucket height to spill beam until the proper intensity is reached.<>
Keywords :
beam handling equipment; ion accelerators; synchrotrons; 170 Hz; Bevalac beam spill; RF bucket height; circulating beam intensity; feedback; filter; scintillator; spill ripple; time structure; vacuum chamber; wire chamber; Feedback; Filters; Magnetic separation; Particle beam measurements; Particle beams; Radiation detectors; Radio frequency; Reproducibility of results; Time measurement; Wire;
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.1991.164648
