High energy beam line based on bent crystal

摘要

A peculiarities of the beam bent with crystals is the independence of the crystal deflector strength (Theta)=L(sub D)/R(sub c)(approx)0.5 rad of the particle energy (L(sub D) is the dechanneling length, R(sub c) is the critical radius). The possibility of abrupt bending with crystal of a beam fraction at a large angle allows one to make over a short base a non-traditional beam line to carry out physical experiments. At IHEP, a 150 mrad bent crystal was used to create a test area, to work in parallel with other set-ups consuming practically no power. A 100 mm long Si crystal, placed in the halo of the intense extracted 70 GeV/c beam, extracts along the (approx)20 m base 10(sup 6) protons/sec beyond the 2-meter iron-concrete shield. The beam high quality (low emittance and high stability) allows one to carry out the program of the studies of channeling and testing the microstrip detectors. 2 refs.; 2 figs. (Atomindex citation 27:011081)