Hlt. Nian et al., THERMOMECHANICAL ANALYSIS OF FIXED MASK-1 FOR THE ADVANCED PHOTON SOURCE INSERTION DEVICE FRONT-ENDS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 347(1-3), 1994, pp. 657-663
The first fixed mask is one of the critical elements on the insertion
device front ends of the beamlines at the Advanced Photon Source now u
nder construction at Argonne National Laboratory. The heat flux from t
he undulators will be very large. We simulated the X-ray beam at sever
al locations to ensure that the worst possible case was considered. Th
e maximum temperature (about 180-degrees-C) occurs when the beam hits
the center of the horizontal surface. The maximum effective stress (ab
out 313 MPa) occurs when the X-ray beam hits at or near the corners.