LIGO Document E1400012-v1

Pumpdown and Ultimate Pressures (PSI document V049-1-078, rev 0)

Document #:
LIGO-E1400012-v1
Document type:
E - Engineering documents
Other Versions:
Abstract:
Pumpdown and Ultimate Pressures calculated by PSI for Initial LIGO.
Topics:
Authors:
Notes and Changes:
Pumpdown and Ultimate Pressures (PSI document V049-1-078, rev 0). I think that this was one of the documents within the PSI document collection V049-1-097, CDRL No. 03. Note that the volumes are different for aLIGO in the vertex and diagonal sections due to the larger diameter and longer input and output sections:
Section
iLIGO
volume (m^3)
aLIGO
volume (m^3)
reference
BSC Chamber 27.2
27.2
SolidWorks, compare to 31.67m^3 in V049-1-078,rev 0
HAM Chamber 10.4
10.4
SolidWorks, compare to 11.26m^3 in V049-1-078,rev 0
LLO End 56
56
V049-1-078, rev 0
MC Tubes 10.89
99.25
iLIGO: V049-1-078,rev0 (2) MC tubes ea 12m long & 0.76m dia
aLIGO: 2 MC tubes ea 13.7m long & 2.15m dia
LLO Corner 380
468
iLIGO: V049-1-078, rev 0
aLIGO: iLIGO estimate revised with aLIGO MC estimate
The SolidWorks volume calculations for the chambers should be more accurate than the PSI-V049-1-078,rev0 estimates. Note that the overall vacuum volume size estimates above have not been changed to reflect the SolidWorks calculations -- as a result the vacuum volume estimates may be ~10% higher than actual.

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