From b97f68cdc90103bbf63e5583cc9e53772930d95c Mon Sep 17 00:00:00 2001
From: Jameson Graef Rollins <jrollins@finestructure.net>
Date: Thu, 22 Mar 2018 17:14:39 -0700
Subject: [PATCH] Update aLIGO parameters based on new estimates from
LIGO-T1800044
Updates to materials parameters for new thermal noise estimate, and SRM and
PD params.
https://dcc.ligo.org/LIGO-T1800044
---
gwinc/ifo/aLIGO.yaml | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/gwinc/ifo/aLIGO.yaml b/gwinc/ifo/aLIGO.yaml
index f2f005d..8961798 100644
--- a/gwinc/ifo/aLIGO.yaml
+++ b/gwinc/ifo/aLIGO.yaml
@@ -26,6 +26,8 @@
# 12. Gretarsson & Harry, Gretarsson thesis
# 13. Fejer
# 14. Braginsky
+#
+# Updated numbers March 2018: LIGO-T1800044
Constants:
# Temperature of the Vacuum
@@ -182,7 +184,7 @@ Materials:
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: 2.3e-4
+ Phihighn: 3.6e-4 # tantala mechanical loss
Indexhighn: 2.06539
## low index material: silica
@@ -192,7 +194,7 @@ Materials:
Alphalown: 5.1e-7 # Fejer et al
Betalown: 8e-6 # dn/dT, (ref. 14)
ThermalDiffusivitylown: 1.38 # Fejer et al
- Philown: 4.0e-5
+ Philown: 5.0e-5 # silica mechanical loss
Indexlown: 1.45
## Substrate Material parameters--------------------------------------------
@@ -216,7 +218,7 @@ Laser:
## Optics------------------------------------------------------------------
Optics:
Type: 'SignalRecycled'
- PhotoDetectorEfficiency: 0.95 # photo-detector quantum efficiency
+ 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
@@ -242,7 +244,7 @@ Optics:
PRM:
Transmittance: 0.03
SRM:
- Transmittance: 0.20
+ Transmittance: 0.325
CavityLength: 55 # m, ITM to SRM distance
Tunephase: 0.0 # SEC tuning
--
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