Commit 4828e7b9 authored by Lee McCuller's avatar Lee McCuller

moved fixes to sus in aLIGO.yaml to A+.yaml to fix sus noise curve

parent 89931e18
......@@ -38,6 +38,18 @@ Infrastructure:
polarizability: 7.8e-31 # m^3
TCS:
# The presumably dominant effect of a thermal lens in the ITMs is an increased
# mode mismatch into the SRC, and thus an increased effective loss of the SRC.
# The increase is estimated by calculating the round-trip loss S in the SRC as
# 1-S = |<Psi|exp(i*phi)|Psi>|^2, where
# |Psi> is the beam hitting the ITM and
# phi = P_coat*phi_coat + P_subs*phi_subs
# with phi_coat & phi_subs the specific lensing profiles
# and P_coat & P_subst the power absorbed in coating and substrate
#
# This expression can be expanded to 2nd order and is given by
# S= s_cc P_coat^2 + 2*s_cs*P_coat*P_subst + s_ss*P_subst^2
# s_cc, s_cs and s_ss were calculated analytically by Phil Willems (4/2007)
s_cc: 7.024 # Watt^-2
s_cs: 7.321 # Watt^-2
s_ss: 7.631 # Watt^-2
......@@ -68,18 +80,20 @@ Seismic:
Suspension:
Type: 'Quad'
FiberType: 'Round'
FiberType: 'Tapered'
BreakStress: 750e6 # Pa; ref. K. Strain
Temp: 290
# VHCoupling:
# theta: 1e-3 # vertical-horizontal x-coupling (computed in precompIFO)
Silica:
Rho : 2200 # Kg/m^3;
Rho : 2.2e3 # Kg/m^3;
C : 772 # J/Kg/K;
K : 1.38 # W/m/kg;
Alpha : 3.9e-7 # 1/K;
dlnEdT: 1.52e-4 # (1/K), dlnE/dT
Phi : 4.1e-10 # from G Harry e-mail to NAR 27April06 dimensionless units
Y : 72e9 # Pa; Youngs Modulus
Y : 7.2e10 # Pa; Youngs Modulus
Dissdepth: 1.5e-2 # from G Harry e-mail to NAR 27April06
C70Steel:
......@@ -100,8 +114,8 @@ Suspension:
Phi: 1e-4
Y: 187e9
# ref ---- http://design.caltech.edu/Research/MEMS/siliconprop.html
# all properties should be for T ~ 20 K
# ref http://www.ioffe.ru/SVA/NSM/Semicond/Si/index.html
# all properties should be for T ~ 120 K
Silicon:
Rho: 2329 # Kg/m^3; density
C: 300 # J/kg/K heat capacity
......@@ -109,9 +123,9 @@ Suspension:
Alpha: 1e-10 # 1/K thermal expansion coeff
# from Gysin, et. al. PRB (2004) E(T): E0 - B*T*exp(-T0/T)
# E0: 167.5e9 Pa T0: 317 K B: 15.8e6 Pa/K
dlnEdT: -2.0e-5 # (1/K) dlnE/dT T=20K
dlnEdT: -2e-5 # (1/K) dlnE/dT T=120K
Phi: 2e-9 # Nawrodt (2010) loss angle 1/Q
Y: 1.558e11 # Pa Youngs Modulus
Y: 155.8e9 # Pa Youngs Modulus
Dissdepth: 1.5e-3 # 10x smaller surface loss depth (Nawrodt (2010))
# Note stage numbering: mirror is at beginning of stack, not end
......@@ -122,6 +136,9 @@ Suspension:
Stage:
# Stage1
- Mass: 39.6 # kg; current numbers May 2006 NAR
# length adjusted for d = 10mm and d_bend = 4mm
# (since 602mm is the CoM separation, and d_bend is accounted for
# in suspQuad, so including it here would double count)
Length: 0.59 # m
Dilution: .nan #
K: .nan # N/m; vertical spring constant
......@@ -161,9 +178,12 @@ Suspension:
Width: 1150e-6 # m
Fiber:
EndLength: 4.5e-02
EndRadius: 4e-04
Radius: 2.05e-04
Radius: 205e-6 # m
# for tapered fibers
# EndRadius is tuned to cancel thermo-elastic noise (delta_h in suspQuad)
# EndLength is tuned to match bounce mode frequency
EndRadius: 400e-6 # m; nominal 400um
EndLength: 45e-3 # m; nominal 20mm
## Optic Material -------------------------------------------------------
Materials:
......@@ -173,14 +193,15 @@ Materials:
## Dielectric coating material parameters----------------------------------
Coating:
## high index material: tantala
Yhighn: 124e9
Sigmahighn: 0.28
Yhighn: 124e9 # LMA (Granata at LVC) 2017 (was 140)
Sigmahighn: 0.28 # LMA (Granata at LVC) 2017 (was 0.23)
CVhighn: 2.1e6 # Crooks et al, Fejer et al
Alphahighn: 3.6e-6 # 3.6e-6 Fejer et al, 5e-6 from Braginsky
Betahighn: 1.4e-5 # dn/dT, value Gretarrson (G070161)
ThermalDiffusivityhighn: 33 # Fejer et al
Phihighn: 9.0e-5 # tantala mechanical loss
Indexhighn: 2.06539
Phihighn: 9.0e-5 # tantala mechanical loss
Phihighn_slope: 0.1
## low index material: silica
Ylown: 72e9
......@@ -189,8 +210,9 @@ Materials:
Alphalown: 5.1e-7 # Fejer et al
Betalown: 8e-6 # dn/dT, (ref. 14)
ThermalDiffusivitylown: 1.38 # Fejer et al
Philown: 1.25e-5 # silica mechanical loss
Indexlown: 1.45
Philown: 1.25e-5 # silica mechanical loss
Philown_slope: 0.4
## Substrate Material parameters--------------------------------------------
Substrate:
......@@ -213,11 +235,12 @@ Laser:
## Optics------------------------------------------------------------------
Optics:
Type: 'SignalRecycled'
PhotoDetectorEfficiency: 0.9 # photo-detector quantum efficiency
Loss: 37.5e-6 # average per mirror power loss
BSLoss: 0.5e-3 # power loss near beamsplitter
coupling: 1.0 # mismatch btwn arms & SRC modes; used to
# calculate an effective r_srm
SubstrateAbsorption: 0.5e-4 # 1/m; bulk absorption coef (ref. 2)
pcrit: 10 # W; tolerable heating power (factor 1 ATC)
Quadrature:
......
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