A heat transfer study for beamline components in high-power wiggler and undulator beamlines. Part I. Beam stops (invited)

Abstract

The heat transfer capabilities of beam stops in CHESS wiggler and undulator beamlines is described. The thermal analysis for the design of these crucial in-vacuum beamline components is based on the use of a finite element analysis computer calculation and experimental heat loading tests.

Optimal design of a beam stop for Indus-2 using finite element heat transfer studies

“…To verify the validity of these assumptions and also for bench-marking, we have performed calculations on a similar problem from the literature (Bedzyk et al 1989). Our calculations show that for the absorbed power of 5 kW, the maximum temperature obtained with the above mentioned assumptions is 467 • C (see figure 2), which compares very well with the literature value (460 • C) obtained with a realistic load.…”

“…Temperature contours for one quadrant of a water-cooled beam stop for a heat load of 5 kW from wiggler of the CHESS synchrotron(Bedzyk et al 1989). The calculations are repeated to justify the assumptions made in the present calculations and also for bench-marking.…”

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“…The model is strain rate sensitive and temperature dependent. 3. It is capable of determining isotropic and directional hardening, thermal recovery of hardening, creep and stress relaxation, cyclic hardening and softening, cyclic creep and relaxation, temperature and pressure dependence of the plastic flow.…”

“…The value used in this analysis is obtained by executing the program TRANSMIT. is the parameter defined as (3) and h is the depth measured from the vacuum heating surface. The vertical angle is written as …”

“…CESR has successfully used beryllium in conjunction with copper tubing to form a beryllium-Copper composite absorber (Mills, et al [2]) to diffuse the heat flux. Several other researchers have also reported comprehensive thermal analysis using beryllium materials applied to beam stops (e.g., Bedzyk, et al [3], Choi [4], and Khounsary [5]). diffusion, oxidation, and other corrosion and chemical changes (Madayag [11).…”