NIST Center for Neutron Research, 1998 programs and accomplishments
Abstract
This has been a productive and exciting year for the NIST Center for Neutron Research (NCNR), with many achievements in operation, instrumentation, and science.The reactor operated well through September, when an unscheduled shutdown was required to investigate a small leak in the vicinity of the thermal column.As a result of an excellent effort by the Reac- tor Operations and Engineering staff, this shutdown lasted no more than one complete cycle ( 14 % of avail- ability).The reactor is now once again operating on our normal seven week schedule.We apologize to all those who were inconvenienced, and will work to make up as much of the time as possible.The next long scheduled shutdown, for replacement of shim control arms, is scheduled to begin in February, 2000 and will last 3-6 months.During this year, commissioning of the high intensity back scattering spectrometer was begun, with very favorable results (see section later in this report), and the instrument should be available for user scheduling at the next program proposal period.Great progress was also made on the Spin Echo and DiscChopper Spectrometers, with commissioning expected in the coming year.The reliability of operating instru- ments continues to be better than 95 %, with the aver- age over all instruments being 98 %.The final engineering design of the second generation liquid hydro- gen cold source is nearing completion, and fabrication and testing will begin in 1999.This source is calcu- lated to provide…
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