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11 December 1998 Commercial developments in synchrotron optical components: a novel coolant for high-heat-load optics
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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