Improved helium exchange gas cryostat and sample tube designs for automated gas sampling and cryopumping

Citation:
Buerki, PR, Jackson BC, Schilling T, Rufer T, Severinghaus JP.  2006.  Improved helium exchange gas cryostat and sample tube designs for automated gas sampling and cryopumping. Geochemistry Geophysics Geosystems. 7

Date Published:

Oct

Keywords:

abrupt climate-change, and techniques, Antarctica, cryopumping, cryosphere : ice cores, cryostat, end, gas separation, geochemistry : instruments, geochemistry : stable isotope geochemistry, helium exchange gas refrigerator, laboratory automation, last glacial period, polar ice, ratio, stable isotope, trapped air

Abstract:

[ 1] In order to eliminate the use of liquid helium for the extraction of atmospheric gases from polar ice cores, two units of a redesigned top load helium exchange gas cryostat were built and tested. The cryostats feature the shortest and largest diameter sample wells built to date, a base temperature below 7 Kelvin, and a sample well without baffles. The cryostats allowed shortening the length and thus increasing the gas pressure inside our sample tubes by 58% and increasing the amount of sample ending up in the mass spectrometer by 4.4%. The cryostats can either be used as mobile stand-alone units for manual gas processing lines or integrated into a fully automated vacuum extraction and gas analysis line. For the latter application the cryostat was equipped with a custom-designed automated changeover system.

Notes:

n/a

Website

DOI:

10.1029/2006gc001341

Scripps Publication ID:

Q10010