Publications
Publication Information
| Title | Pressure achieved in low-outgassing chambers using NEG and ion pumps with XHV gauges | ||
| Authors | Marcy Stutzman, Philip Adderley, Abdullah Mamun, M. Poelker | ||
| JLAB number | JLAB-ACC-19-2933 | ||
| LANL number | (None) | ||
| Other number | DOE/OR/23177-4678 | ||
| Document Type(s) | (Journal Article) | ||
| Associated with EIC: | No | ||
| Supported by Jefferson Lab LDRD Funding: | No | ||
| Funding Source: | Nuclear Physics (NP) | ||
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Journal Compiled for Journal of Vacuum Science & Technology A Refereed | |||
| Publication Abstract: | Previously we reported the outgassing rates for stainless steel chambers following various heat treatments and surface coatings . In this paper, we present the pressure measurements for these chambers after the addition of NEG and ion pumps, we discuss the considerations for using commerical gauges near the XHV pressure regime, and we compare the measured pressure with that predicted using outgassing rate and pump speed. We find that though the measured outgassing rates varied from 1.8x10 12 TorrLs-1cm-2 to 2x10-16 TorrLs-1cm-2, the pressure achieved in each chamber varied minimally. From these results, we conclude that the outgassing rate measured for the TiN coated chamber was artificially low as a result of a small pump speed in the coating which invalidated the outgassing rate measurement technique. Additionally, we demonstrate that gauge background effects are significant at these pressures, but that at least one commercial gauge has not reached its pressure measurment limit. | ||
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| Group: | Ctr for Injectors&Sources | ||
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