HIGH-EFFICIENCY BENDING OF 450 GEV PROTONS USING CHANNELING

For the first time more than 10% of a 450 GeV proton beam has been bent using planar channeling in a 5 cm long single crystal of silicon. The bent beam is very narrow in angle (+/- 5-mu-rad), symmetrical and has suffered an energy loss of approximately 60% of random energy loss. Some of the unbent particles, however, lose more energy than random particles and the straggling is 50% larger than random. From the unbent fraction the bending dechanneling is inferred and found to be in agreement with calculations. The bending efficiency is in good agreement with theoretical dechanneling estimates. The results present very interesting perspectives for extracting beams from future TeV accelerators.