USJ-TAX - US-Japan Triple Axis Spectrometer
Source and Guide
The cold neutron moderator is the new HB4 supercritical hydrogen
moderator (505 ml) and is
the brightest source of cold neutrons in the world.
The USJ-TAX will be stationed at port C of cold guide 4 (CG-4C) in HFIR’s
new Cold Guide Hall. This guide carries neutrons from a new cold moderator
at HFIR’s port HB4. Near the moderator, an 8° bend provides space for our
monochromator shield and removes our source from line of sight with respect
to HB4’s fast neutrons. This bender has four channels and 90 strait sections
in order to preserve reasonable divergence and up to 20 meV neutrons for the
spectrometer. The bender also includes a vertical trumpet, which exchanges
vertical divergence for a higher guide-beam profile; the 15 cm tall profile
for the CG-4 beam is then well exploited by USJ-TAX’s vertically focusing
monochromator. The expected flux at sample will place the USJ-TAX within the
set of best-in-class cols neutron triple axis spectrometers, worldwide.
Last Modified: Wednesday, 05-Mar-2008 14:04:47 EST
Please forward all questions about this site to:
Barry Winn
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