Type-A Tower ETMX Specification

Contents

Type-A Tower ETMX Specification

IP

Geophone (GEO)

Measurements for characterization >>> klog #3893

Frequency response

Geophone's frequency response to the ground velocity:

Ge: Generator constant [V/(m/s)]
η: Intrinsic damping ratio
ω0: Resonant angular frequency [rad/s]

Sensor	S/N	Generator constant (nominal) [V/(m/s)]	Damping ratio (estimated)	Resonant frequency [Hz]
GEO H1	#11	282.26	0.34	1.07
GEO H2	#12	282.30	0.315	1.065
GEO H3	#13	286.47	0.27	1.31

Noise

Sensor	Noise [m/rtHz] @ 0.1 Hz	Noise [m/rtHz] @ 10 Hz
GEO H1	8e-9	3e-13
GEO H2	8e-9	3e-13
GEO H3	1e-8	3e-13

Calibration

Converted displacement [um] = 6.104 x 10^-4 [V/cnt] / H_GEO(ω) / (gainPreamp) x (DC cutoff) x 1/s (m/(m/s)) x 10⁶

LVDT

Sensor	Efficiency [um/cnt]
LVDT H1	-0.258
LVDT H2	-0.252
LVDT H3	-0.233

Actuator polarization

Polarity is determined so that an +offset at the COILOUTF applies +yaw force in each actuator.

COIL H1: negative
COIL H2: negative
COIL H3: positive

Diagonalization matrix

ACC2EUL

H1	H2	H3	To:
0.6440	-0.1725	-0.4714	Long.
0.1725	-0.6440	0.4714	Trans.
0.5635	0.5635	0.5635	Yaw

LVDT2EUL

H1	H2	H3	To:
0.6666	-0.3333	-0.3333	Long.
0	-0.5774	0.5774	Trans.
0.5612	0.5612	0.5612	Yaw

EUL2COIL

Long.	Trans.	Yaw	To:
1.	0	0.5940	H1
-0.5000	-0.8660	0.5940	H2
-0.5000	0.8660	0.5940	H3

Stepper motor

See also: Stepper motor setup

Epics channel name: K1:STEPPER_EXV_IP
Driver IP address: 10.68.150.46
Motor 0	Motor 1	Motor 2	Motor 3	Motor 4	Motor 5
F0 Yaw	IP H1	IP H2	IP H3	<blank>	<blank>

GAS

LVDT

Sensor	Efficiency [um/cnt]
F0 LVDT GAS	-0.172
F1 LVDT GAS	-0.215
F2 LVDT GAS	-0.243
F3 LVDT GAS	-0.225
BF LVDT GAS	0.204

Fishing Rod (stepper motor)

See also: Stepper motor setup

Motor driver

Epics channel name: K1:STEPPER_EXV_GAS
Driver IP address: 10.68.150.45
Motor 0	Motor 1	Motor 2	Motor 3	Motor 4	Motor 5
F0 GAS	F1 GAS	<blank>	F3 GAS	BF GAS	F2 GAS

Property

	F0 GAS	F1 GAS	F2 GAS	F3 GAS	BF GAS
Movable range	6 mm (± 3 mm)	(TBC)	(TBC)	(TBC)	full range (± 5.5 mm)
+step direction	down	down	down	down	down

BF

2020.5.20 corrected as below.

LVDT (BF Damper)

Sensor	Efficiency [um/cnt]
LVDT V1	-0.3785
LVDT V2	0.3852
LVDT V3	0.3902
LVDT H1	0.4060
LVDT H2	-0.3821
LVDT H3	-0.3629

Note: The polarities are determined to output positive signals when the BF shifts respectively to +vertical/+yaw direction for Vertical/Horizontal LVDTs.

Actuator polarization

Polarity is determined so that an +offset at the COILOUTF applies +yaw force in each actuator.

COIL V1: positive
COIL V2: positive
COIL V3: negative
COIL H1: positive
COIL H2: negative
COIL H3: negative

Note: Polarity may change when connecting the secondary coil to the cable. This configuration is confirmed on [2017.10.27]

Diagonalization matrix

LVDT2EUL

V1	V2	V3	H1	H2	H3	To:
0	0	0	-0.6667	0.3333	0.3333	Long.
0	0	0	0	0.5774	-0.5774	Trans.
0.3333	0.3333	0.3333	0	0	0	Vert.
0.9158	0.9158	-1.8315	0	0	0	Roll
1.5861	-1.5861	0	0	0	0	Pitch
0	0	0	0.8170	0.8170	0.8170	Yaw

EUL2COIL

L	T	V	R	P	Y	To:
0	0	1.	0.1820	0.3152	0	V1
0	0	1.	0.1820	-0.3152	0	V2
0	0	1.	-0.3640	0	0	V3
-1	0	0	0	0	0.4080	H1
0.5	0.8660	0	0	0	0.4080	H2
0.5	-0.8660	0	0	0	0.4080	H3

Picomotor

See also: Picomotor digital setup

Epics channel name: K1:PICO_ETMX
Driver IP address: 10.68.150.20
CH1	CH2	CH3
BF moving mass A	BF moving mass B	Payload yaw

BF moving masses (both A and B ) are currently disabled because of weight limit for upper GAS stages

Suspension models in MEDM

Stage	DOF	Author	Data	Date	klog
IP	L	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_IP_TEST_L_202202181906.xml	2022/2/22	klog19868
IP	T	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_IP_TEST_T_202202181906.xml	2022/2/22	klog19868
IP	Y	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_IP_TEST_Y_202202181906.xml	2022/2/22	klog19868
BF	L	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_BF_TEST_L_202202181906.xml	2022/2/22	klog19868
BF	P	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_BF_TEST_P_202202181906.xml	2022/2/22	klog19868
BF	R	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_BF_TEST_R_202202181906.xml	2022/2/22	klog19868
BF	T	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_BF_TEST_T_202202181906.xml	2022/2/22	klog19868
BF	V	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_BF_TEST_V_202202181906.xml	2022/2/22	klog19868
BF	Y	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_BF_TEST_Y_202202181906.xml	2022/2/22	klog19868
GAS	BF	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_GAS_TEST_BF_202202181906.xml	2022/2/22	klog19868
GAS	F0	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_GAS_TEST_F0_202202181906.xml	2022/2/28	klog19914
GAS	F1	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_GAS_TEST_F1_202202181906.xml	2022/2/28	klog19914
GAS	F3	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_GAS_TEST_F3_202202181906.xml	2022/2/28	klog19914
MN	L	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_MN_TEST_L_202202181906.xml	2022/2/28	klog19914
MN	P	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_MN_TEST_P_202202181906.xml	2022/2/28	klog19914
MN	R	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_MN_TEST_R_202202181906.xml	2022/2/28	klog19914
MN	T	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_MN_TEST_T_202202181906.xml	2022/2/28	klog19914
MN	Y	Yasui	/kagra/Dropbox/Measurements/VIS/PLANT/ETMX/2022/02/PLANT_ETMX_STANDBY_MN_TEST_Y_202202181906.xml	2022/2/28	klog19914

KAGRA/Subgroups/VIS/TypeA/ETMX (last edited 2022-03-07 11:29:59 by hiromi.yasui)