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.
Planar dechanneling of GeV particles in a bent crystal
Abstract Planar dechanneling of GeV particles in a bent crystal has been analysed theoretically on the basis of a modified continuum model of dechanneling. Dechanneling probabilities have been calculated for low-index planes in bent Si and Ge crystals, and the efficiencies of the channeled steering of a GeV particle beam for typical bendings of crystals have been discussed.