Title :
Test results of a fast beam chopper with MA cores
Author :
Mori, Y. ; Muto, M. ; Ohmori, C. ; Shirakabe, Y. ; Takagi, A. ; Yamaguchi, S.
Author_Institution :
KEK, Tsukuba, Japan
Abstract :
A new type of fast beam chopper was developed and installed at the HIMAC facility. Test operations of the chopper have been carried out. The chopper is basically a periodic beam-energy transformer that performs 10% modulation of beam´s kinetic energy. The modulated fraction of the beam is chopped off by the downstream RFQ due to the relatively narrow injection energy window of the RFQ. Some of the recent test results with the chopper are presented. Measured chopped beams show sharp spikes at the pulse edges. Their origin is studied by numerical calculations. Another topic is the beam injection studies at the HIMAC´s main-ring with the use of the chopped beams
Keywords :
accelerator RF systems; beam choppers; beam handling equipment; biomedical equipment; ion accelerators; linear accelerators; numerical analysis; particle beam injection; radiation therapy; HIMAC facility; MA cores; beam injection studies; downstream RFQ; fast beam chopper; numerical calculations; periodic beam-energy transformer; test results; Acceleration; Choppers; Kinetic energy; Optical modulation; Particle beam injection; Particle beams; Pulse measurements; Pulse modulation; Testing; Voltage;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.988343
