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|Title: ||Novel cryogenic engineering solutions for the new Australian Research Reactor OPAL.|
|Authors: ||Olsen, SR|
|Keywords: ||OPAL Reactor|
|Issue Date: ||16-Mar-2008|
|Publisher: ||American Institute of Physics|
|Citation: ||Olsen, S. R., Kennedy, S. J., Kim, S., Schulz, J. C., Thiering, R., & Gilbert, E. P., et al. (2008). Novel cryogenic engineering solutions for the new Australian Research Reactor OPAL. 2007 Cryogenic Engineering Conference and International Cryogenic Materials Conference, 16th – 20th July 2007. In Weisend, J. G. & Barclay, J., et al. (Eds.), AIP Conference Proceedings, Volume 985 (pp. 299-306), Advances in Cryogenic Engineering: Transactions of the Cryogenic Engineering Conference – CEC, Volume 53. Chattanooga, TN, United States of America: Chattanooga Convention Center.|
|Abstract: ||In August 2006 the new 20MW low enriched uranium research reactor OPAL went critical. The reactor has 3 main functions, radio pharmaceutical production, silicon irradiation and as a neutron source. Commissioning on 7 neutron scattering instruments began in December 2006. Three of these instruments (Small Angle Neutron Scattering, Reflectometer and Time-of-flight Spectrometer) utilize cold neutrons. The OPAL Cold Neutron Source, located inside the reactor, is a 20L liquid deuterium moderated source operating at 20K, 330kPa with a nominal refrigeration capacity of 5 kW and a peak flux at 4.2meV (equivalent to a wavelength of 0.4nm). The Thermosiphon and Moderator Chamber are cooled by helium gas delivered at 19.8K using the Brayton cycle. The helium is compressed by two 250kW compressors (one with a variable frequency drive to lower power consumption). A 5 Tesla BSCCO (2223) horizontal field HTS magnet will be delivered in the 2nd half of 2007 for use on all the cold neutron instruments. The magnet is cooled by a pulse tube cryocooler operating at 20K. The magnet design allows for the neutron beam to pass both axially and transverse to the field. Samples will be mounted in a 4K to 800K Gifford-McMahon (GM) cryofurnace, with the ability to apply a variable electric field in-situ. The magnet is mounted onto a tilt stage. The sample can thus be studied under a wide variety of conditions. A cryogen free 7.4 Tesla Nb-Ti vertical field LTS magnet, commissioned in 2005 will be used on neutron diffraction experiments. It is cooled by a standard GM cryocooler operating at 4.2K. The sample is mounted in a 2nd GM cryocooler (4K–300K) and a variable electric field can be applied. © 2008, American Institute of Physics|
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