Commercial developments in synchrotron optical components: a novel coolant for high-heat-load optics

Paul W. Loeffen; John M. Tingay; Timothy M. Gill; Joachim Paul; Phillip Pattison

doi:10.1117/12.332495

11 December 1998 Commercial developments in synchrotron optical components: a novel coolant for high-heat-load optics

Paul W. Loeffen, John M. Tingay, Timothy M. Gill, Joachim Paul, Phillip Pattison

Proceedings Volume 3448, Crystal and Multilayer Optics; (1998) https://doi.org/10.1117/12.332495
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We describe a novel coolant suitable for high heat load optics called Binary-Ice^R. 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-Ice^R 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- Ice^R 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-Ice^R yielded the intrinsic resolution at low energies and a shift in the energy by only 10% of the bandwidth. The application of Binary-Ice^R for cooling of diamonds in undulator monochromators, and for the cooling of x-ray mirrors and multilayers is also discussed.

Citation Download Citation

Paul W. Loeffen, John M. Tingay, Timothy M. Gill, Joachim Paul, and Phillip Pattison "Commercial developments in synchrotron optical components: a novel coolant for high-heat-load optics", Proc. SPIE 3448, Crystal and Multilayer Optics, (11 December 1998); https://doi.org/10.1117/12.332495

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KEYWORDS

Crystals

Monochromators

Laser crystals

Mirrors

Silicon

Synchrotrons

Diamond

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