Commit 324683e4 authored by Jameson Graef Rollins's avatar Jameson Graef Rollins

suspension: clean up fiber type handling

parent 6895ea97
......@@ -48,8 +48,8 @@ def suspQuad(f, ifo, material='Silica'):
material used for test mass suspension stage. steel used for all
other stages. Violin modes are included.
fiberType = suspension sub type 0 => round fibers, otherwise ribbons
ifo.Suspension.FiberType should be: 0=round, 1=ribbons.
hForce, vForce = transfer functions from the force on the TM to TM
motion these should have the correct losses for the mechanical
system such that the thermal noise is:
......@@ -73,9 +73,6 @@ def suspQuad(f, ifo, material='Silica'):
stages by K.Arai.
"""
# default arguments
fiberType = 0
# Assign Physical Constants
g = scipy.constants.g
kB = scipy.constants.k
......@@ -171,14 +168,14 @@ def suspQuad(f, ifo, material='Silica'):
N3 = ifo.Suspension.Stage[1].NWires # Number of wires in stage 1
N4 = ifo.Suspension.Stage[0].NWires # Number of wires in stage 1
if ifo.Suspension.FiberType == 0:
if ifo.Suspension.FiberType == 0: # Round
r_fib = ifo.Suspension.Fiber.Radius
xsect = pi * r_fib**2 # cross-sectional area
II4 = r_fib**4 * pi/4 # x-sectional moment of inertia
mu_v = 2 / r_fib # mu/(V/S), vertical motion
mu_h = 4 / r_fib # mu/(V/S), horizontal motion
tau_si = 7.372e-2 * rho * C * (4*xsect/pi) / K # TE time constant
else:
elif ifo.Suspension.FiberType == 1: # Ribbon
W = ifo.Suspension.Ribbon.Width
t = ifo.Suspension.Ribbon.Thickness
xsect = W * t
......@@ -186,6 +183,8 @@ def suspQuad(f, ifo, material='Silica'):
mu_v = 2 * (W + t)/(W*t)
mu_h = (3 * N4 * W + t)/(N4*W + t)*2*(W+t)/(W*t)
tau_si = (rho * C * t**2) / (K * pi**2)
else:
raise Exception("Unsupported suspension type: {}".format(ifo.Suspension.FiberType))
# loss factor, last stage suspension, vertical
phiv4 = phi_si * (1 + mu_v * ds)
......
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