Diff for "LCGT/subgroup/ifo/ISC/IFOParameters"

Differences between revisions 127 and 131 (spanning 4 versions)

Interferometer Parameters

Old parameter sets (before 2010)

(Classical-noise parameters are here)

Parameter	LCGT VRSE-D¹	LCGT VRSE-B	units
Laser source
Wave length	1064		nm
Initial Laser Power	150		W
Injecting Laser Power into IFO	78.48 (in total), 75 (carrier)		W
Modulation depth	0.3 for both
RF freq 1	11.25M (PM)		Hz
RF freq 2	45.00M (AM)		Hz
Primary parameters of interferometer
Arm cavity Finesse	1546
Arm cavity power gain	960
PR gain	10.4
Arm power (single arm)²	374k = 75 * 10.4 * 960 /2		W
PRC power on BS	780 = 75 * 10.4		W
Cavity Length
Arm cavity length	3000		m
PR cavity length	73.2826		m
Asymmetry length	3.33103		m
BS-FM length	25		m
SR cavity length	73.2826		m
SRC detuning phase	86.5	90.0	degree
Mirror optical properties
EM Reflectivity	0.999945
FM Reflectivity	0.996000
PRM Reflectivity	0.900000
SRM Reflectivity	0.846400 = 0.92²
BS Reflectivity	0.5
HR Coating Loss of EM, FM, PRM and SRM	45e-6
BS Loss	100e-6
Transmissivity	1 - R - Loss
AR Transmissivity	0.999
AR Coating Loss	1000e-6

Bulk loss (absorption) (large optics ??? for Sapphire: ???FM, EM)	20		ppm
Bulk loss (absorption) (small optics ??? for Fused Silica: ???)	2.5		ppm

Arm cavity cut-off frequency			Hz
PR cavity cut-off frequency			Hz
PR-Arm cut-off frequency			Hz
SR gain	24
Signal band			Hz
MICH contrast
Other losses in PRC
Other losses in SRC

Mirror geometries
EM mass	30		kg
FM mass	30		kg
PRM mass	TBD		kg
SRM mass	TBD		kg
BS mass	TBD		kg

EM ROC	1900		m
FM ROC	1900		m
FM AR ROC	Flat		m
PRM ROC	TBD		m
SRM ROC	TBD		m
BS ROC	Infinity		m

EM radius/thickness	25 / 15		cm
FM radius/thickness	25 / 15		cm
PRM radius/thickness	TBD		cm
SRM radius/thickness	TBD		cm
BS radius/thickness	TBD		cm

Mode Cleaner
MC1 length	10.0		m
MC2 length	13.324109		m
MC1 Finesse	TBD
MC2 Finesse	TBD

Output Mode Cleaner
OMC length	1.5		m
OMC Finesse	2000
OMC input/output mirror reflectivity	TBD
OMC end mirror reflectivity	TBD
OMC MC FSR	???		MHz
DC readout phase	134.7	121.8	degree
Control Bandwidth
Quantum efficiency	0.9
CARM control band width	30k		Hz
DARM control band width	200		Hz
PRC control band width	50		Hz
MICH control band width	50		Hz
SRC control band width	50		Hz
Feed-Forward gain	-0.97 (openloop), 1/(1-0.97) = 30 (closed loop)

To do list to define parameters for 2009

Reference

Band-Width Special Working Group. (1)
Arm power was defined by sum of both arm powers. It should be a stored power of single arm. (2)

LCGT/subgroup/ifo/ISC/IFOParameters (last edited 2011-04-30 00:35:52 by OsamuMiyakawa)

-  ⇤ ← Revision 127 as of 2010-07-29 16:47:38 → 
  Size: 5131
  Editor: DaisukeTatsumi
  Comment:
+   ← Revision 131 as of 2010-08-10 18:23:14 → ⇥
  Size: 5192
  Editor: DaisukeTatsumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 17:
-||MC1 length                         || B) 10.0 || ||m||
||MC2 length                         || B) 13.324109 || ||m||
||MC1 Finesse                        || X-( TBD || || ||
||MC2 Finesse                        || X-( TBD || || ||
-Line 33:
+Line 29:
-||SRC detuning phase|| 86.5 <:( 3.4 ???     ||  90.0  ||degree||
+||SRC detuning phase|| 86.5      ||  90.0  ||degree||
-Line 65:
+Line 61:
-||EM ROC            || 7113.900    || ||m||
||FM ROC            || 7113.900    || ||m||
||FM AR ROC         || <:( TBD || ||m||
+||EM ROC            || 1900 || ||m||
||FM ROC            || 1900 || ||m||
||FM AR ROC         || Flat || ||m||
-Line 77:
+Line 73:
+|| || || || ||
||<bgcolor="#FFFF00":colspan="4"> '''Mode Cleaner''' ||
||MC1 length                         || B) 10.0 || ||m||
||MC2 length                         || B) 13.324109 || ||m||
||MC1 Finesse                        || X-( TBD || || ||
||MC2 Finesse                        || X-( TBD || || ||
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+Line 95:
+|| || || || ||