DE93 000612 Thermal Analysis of the Crotch Absorber in APS 1

The submitted manuscript has been authored bv a contractor of the U. S. Government under contract No. W-31-109-ENG-38. Accordingly, the U. S. Government retains a. nonexclusive, royalty-iree license to publish or reproduce the published form of this contribution, or allow others to do so, for U S Government purposes. A crotch absorber design for use in the Advanced Photon Source (APS) has been proposed and analyzed. The absorber is placed downstream of sectors S2 and S4 in the curved storage ring chamber W and wili be subjected to a peak power of ISO = • per 100mA synchrotron radiation. A beryllium mm 2 ring is brazed on the GlidCop cooling cylinder in order to diffuse the concentrated bending magnet heating. One concentric water channel and two annular return water channels are arranged in the GlidCop cylinder to enhance the coolinf. A Bodner-Partom thermoviscoplastic constitutive equation and a modified Manson-Cofnn fatigue relation are proposed to simulate the cyclic thermal loading, as well as to predict the thermal fatigue life of the crotch absorber. Results of temperature and stress using finite element computations are displayed and series of e-beam welder tests and microstructure measurements are reported.