Development of crystal extraction studies at the IHEP accelerator
The crystal extraction of 10/sup 7/ proton/s at the BEC experimental facility is described. Detailed computer analysis is made to explain the basic experimental results. Future high-intensity efficient extraction using a short crystal is announced.
Extraction of the 70 GeV proton beam from the IHEP accelerator towards beam line 2(14) with a bent single crystal
Abstract The multiturn 70 GeV proton beam extraction towards beam line 2(14) for the PROZA facility with a single crystal of Si bent by 80 mrad installed into the IHEP accelerator vacuum chamber is realized. When (2–3)×10 10 accelerated protons were spilled onto the crystal, about 2 × 10 6 particles were recorded in the beam line. Thus, the extracting efficiency is about 0.8 × 10 −4 by an extracting time of up to 2 s. The possibilities for increasing the extracting efficiency as well as the simultaneity coefficient of the physical facilities are discussed.
DESIGN CONSIDERATION TO PPM KLYSTRONS FOR INDUSTRIAL LINAC
Toshiba has been developing the C-band and X-band Periodic Permanent Magnet (PPM) focused klystron in collaboration with KEK and manufactured prototypes for the JLC project. [1] The PPM klystron has an advantage to enhance the total efficiency as a result of eliminating the electric power for the focusing magnet. From experience on the development the PPM focused klystrons for the JLC project, we plan to apply the PPM focused klystron to the medical and industrial linac. The periodic magnet focusing scheme has some technical difficulties such as stop band voltage. To design the PPM klystron for the medical and industrial linac, it is necessary to give heed to electron beam instability; so that the tube parameters of the PPM focused klystrons have some constraints. The size of the accelerator system is substantially reduced if a PPM focused klystron is used. The majority of medical and industrial linacs use frequencies of S-band range. We discuss the availability of the S-band PPM focused klystron in this paper.