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Residual gas sub-budgets and updates

Merged Kevin Kuns requested to merge kevin.kuns/pygwinc:residual-gas into master
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@@ -85,7 +85,7 @@ def residual_gas_damping(f, ifo, species, sustf, squeezed_film):
# infinite volume viscous damping coefficient for a cylinder
# table 1 of https://doi.org/10.1016/j.physleta.2010.06.041
beta_inf = pi * radius**2 * pressure/thermal_vel
beta_inf *= (1 + thickness/(2*radius) + pi/4)
beta_inf *= sqrt(8/pi) * (1 + thickness/(2*radius) + pi/4)
force_noise = 4 * kT * beta_inf
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