Differences between revisions 35 and 36
 ⇤ ← Revision 35 as of 2017-10-19 22:27:06 → Size: 3281 Editor: KokiOkutomi Comment: ← Revision 36 as of 2017-10-19 22:32:50 → ⇥ Size: 3309 Editor: KokiOkutomi Comment: Deletions are marked like this. Additions are marked like this. Line 76: Line 76: === LVDT (BF Damper) ===

# ETMX Specification

## IP

### Accelerometer (ACC)

• ACC H1 (SN7): -5.288 [(um/s^2)/cnt]
• ACC H2 (SN8): 5.830 [(um/s^2)/cnt]
• ACC H3 (SN5): -5.289 [(um/s^2)/cnt]

### LVDT

• LVDT H1: -0.258 [um/cnt]
• LVDT H2: -0.252 [um/cnt]
• LVDT H3: -0.233 [um/cnt]

### 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 -0.1726 -0.4714 Long. 0.1726 -0.6440 0.4714 Trans. 0.6833 0.6833 0.6833 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 -0.5 -0.8660 0.5940 H2 -0.5 0.8660 0.5940 H3

## GAS

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

## BF

### LVDT (BF Damper)

• LVDT V1: 0.3785 [um/cnt]
• LVDT V2: 0.3852 [um/cnt]
• LVDT V3: 0.3902 [um/cnt]
• LVDT H1: 0.4060 [um/cnt]
• LVDT H2: 0.3821 [um/cnt]
• LVDT H3: 0.3629 [um/cnt]

### Diagonalization matrix

• LVDT2EUL
 V1 V2 V3 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 -0.5 -0.8660 0.5940 H2 -0.5 0.8660 0.5940 H3

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