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 * Converted displacement [um] = 3.052e-4 [V/cnt] / H_{GEO}(ω) / (gainPreamp) x (DC cutoff) x 1/s (vel2disp)

Type-A Tower ETMX Specification


IP

IPconfig_ETMXv2.png

Geophone (GEO)

Frequency response

Geophone's frequency response to the ground velocity:

texclip20171227223533.png

  • 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

respGEOall20171220.png

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

psdGEOnoiseVel20171220.png psdGEOnoiseDisp20171220.png

Calibration

  • Converted displacement [um] = 3.052e-4 [V/cnt] / H_{GEO}(ω) / (gainPreamp) x (DC cutoff) x 1/s (vel2disp)

tfmdlETMX_GEOH1calib20180205.png

LVDT

Sensor

Efficiency [um/cnt]

LVDT H1

-0.258

LVDT H2

-0.252

LVDT H3

-0.233

calibLVDT_ETMX_IPH1_20171012.png calibLVDT_ETMX_IPH2_20171012.png calibLVDT_ETMX_IPH3_20171012.png

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

calibLVDT_ETMX_F0GAS20171012.png calibLVDT_ETMX_F1GAS20170907.png calibLVDT_ETMX_F2GAS20170822.png

calibLVDT_ETMX_F3GAS20170803.png calibLVDT_ETMX_BFGAS20170725.png

Fishing Rod (stepper motor)

See also: Stepper motor setup

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

Movable range

  • F0 GAS: 6 mm (± 3 mm)
  • F1 GAS:
  • F2 GAS:
  • F3 GAS:
  • BF GAS: full range (11 mm)

BF

BFconfig_ETMXv2.png

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.

calibLVDT_ETMX_BFV1_20170802.png calibLVDT_ETMX_BFV2_20170802.png calibLVDT_ETMX_BFV3_20170803.png

calibLVDT_ETMX_BFH1_20170802.png calibLVDT_ETMX_BFH2_20170802.png calibLVDT_ETMX_BFH3_20170802.png

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

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