From aa8a15ecf0c617e8091bfcd87764d90e3c546075 Mon Sep 17 00:00:00 2001
From: Kevin Kuns <kevin.kuns@ligo.org>
Date: Mon, 1 Mar 2021 11:50:57 -0500
Subject: [PATCH] quantum noise uses test mass susceptibility for SQL strain
* The quantum noise calculation uses the test mas susceptibility instead of the free mass approximation in shotradSignalRecycled.
* The free mass approximation is still used in shotradSignalRecycledBnC and the functions in squeeze.py
---
gwinc/noise/quantum.py | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/gwinc/noise/quantum.py b/gwinc/noise/quantum.py
index e3f6d36c..95a2b974 100644
--- a/gwinc/noise/quantum.py
+++ b/gwinc/noise/quantum.py
@@ -296,8 +296,8 @@ def shotradSignalRecycled(f, ifo, sustf, power):
lossArm = sqrt(lambda_arm)
lossSR = sqrt(lambda_SR)
- Omega = 2*pi*f # Signal angular frequency [rad/s]
- h_SQL = sqrt(8 * hbar / (m * (Omega * L)**2)) # SQL Strain
+ Omega = 2*pi*f # Signal angular frequency [rad/s]
+ h_SQL = sqrt(8 * hbar * np.abs(sustf.tst_suscept)) / L # SQL Strain
K = - 16 * P * omega_0 / c**2 * sustf.tst_suscept
# arm cavity
--
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