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Proceedings Paper

Commercial developments in synchrotron optical components: a novel coolant for high-heat-load optics
Author(s): Paul W. Loeffen; John M. Tingay; Timothy M. Gill; Joachim Paul; Phillip Pattison
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Paper Abstract

We describe a novel coolant suitable for high heat load optics called Binary-IceR. This coolant exploits the latent heat of microscopic ice particles in a water/antifreeze mixture, which confer an effective specific heat capacity up to eight times that of water. Binary-IceR has a film heat transfer coefficient several times that of water or brine which reduces the thermally induced strain in optical components compared to identical water-cooled configurations. Furthermore, the coolant temperature only increases by a few degrees under normal operating conditions, yielding uniform cooling. Finite element analysis has been used to model a thin silicon [111] crystal that is back-cooled by brine or Binary- IceR with an incident power density of 4 Wmm-2 commensurate with a modern bending magnet monochromator. Water cooling was found to be impracticable due to the thermal bump inducing a spread in the selected bandwidth which was greater than 50% worse than the intrinsic resolution of Si[111], and a downward shift in the energy by more than the intrinsic bandwidth. By comparison Binary-IceR yielded the intrinsic resolution at low energies and a shift in the energy by only 10% of the bandwidth. The application of Binary-IceR for cooling of diamonds in undulator monochromators, and for the cooling of x-ray mirrors and multilayers is also discussed.

Paper Details

Date Published: 11 December 1998
PDF: 10 pages
Proc. SPIE 3448, Crystal and Multilayer Optics, (11 December 1998); doi: 10.1117/12.332495
Show Author Affiliations
Paul W. Loeffen, Oxford Instruments (United Kingdom)
John M. Tingay, Oxford Instruments (United Kingdom)
Timothy M. Gill, Oxford Instruments (United Kingdom)
Joachim Paul, Integral Energietechnik GmbH (Germany)
Phillip Pattison, Univ. de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 3448:
Crystal and Multilayer Optics
Albert T. Macrander; Andreas K. Freund; Tetsuya Ishikawa; Dennis M. Mills, Editor(s)

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