SSRL-PEP ring divertor channel entrance thermal stress analysis for new bending magnet loads.

摘要

Very thin x-ray beams emerging from bending magnets on the Stanford SSRL electron-positron storage ring (PEP) impinge on the entrance to tangential divertor channels which lead to the experiment beam lines. This energy deposition causes highly localized heating in the channel structure. This, in turn, creates thermally induced stresses. LLNL completed seven analyses of a Al 6061-T6 divertor channel just downstream of an experimental undulator device to determine its temperature and thermally induced stress distribution resulting from this heating. The entrance structure of this the divertor channel is cooled by 30(degree)C, water flowing in the beamwise direction at 6 gpm. The x-ray beam emanating from 15 GeV electrons in a 35 mA current should result in the entrance to the divertor channel operating at a peak temperature of 119(degree)C with a resultant peak thermal stress at 48% of yield of Al 6061 at 119(degree)C. The peak stress is linearly proportion to beam current. The peak stress is approximately proportional to the 2.7 power of the electron ring energy. 6 refs., 9 figs., 2 tabs. (ERA citation 15:032961)