LIGO Document E1800358-v1

BT pressure code Mathematica

Document #:
LIGO-E1800358-v1
Document type:
E - Engineering documents
Other Versions:
LIGO-E1800358-v4
26 Jun 2019, 12:00
LIGO-E1800358-v3
12 Mar 2019, 09:04
LIGO-E1800358-v2
08 Mar 2019, 07:39
Abstract:
This code solves the free molecular diffusion model like Rai W. used in btwaterleak, however the surface outgassing is simplified so the user can use the familiar rate/unit surface area/second. The beamtube can be broken up into sections, with user defined leaks, pump arraignments, etc. The code solves the coupled differential equations for each section. Result is steady-state pressure distribution for the given set of pumping and outgas (and leak) conditions.

Can calculate conductance if you set one end of the tube as a source and the other as a sink.

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