Volume 472 - 20th International Workshop on Polarized Source, Targets, and Polarimetry (PSTP2024) - Polarized Solid Targets II
New helium recapture and reliquefier system for Dynamic Nuclear Polarization at UNH.
C. Lama* and E. Long
*: corresponding author
Full text: Not available
Abstract
A new helium recapture and reliquefaction system, consisting of a gas bag, recapture manifold,
cooling chiller, cryogenic purifier and, a gas storage cylinder banks, has been installed in the
dynamic nuclear polarized target lab at the University of New Hampshire. This new system has
the capability to improve the efficiency of our capacity to do target polarization runs by recycling
our cryogenic helium which would otherwise be lost during polarization operations. Our helium
liquefier is rated upto 40 L/Day under normal full-capacity operations, and is rated for a capacity
of 500 liquid liters of helium. I explain the initial installation process followed by a discussion of
the challenges with installation, including issues of impurities which appeared during the initial
operation of the system. Then I discuss how we overcame these difficulties. Finally, I discuss the
function of the system during normal operation and the present situation of the helium recapture
and reliquefaction processing in the UNH Lab.
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