|
Size: 3850
Comment:
|
Size: 4001
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 38: | Line 38: |
| * Updated actuator design of KAGRA cryogenic payload [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6948|JGW-G1706948]] |
bKAGRA Suspensions Actuator Design Summary
suspension and stage |
coil |
magnet |
coil-magnet |
coil driver |
MCi/e/o (Type-C) TM |
41 turns by default (some are 40 turns?), ~2.5 Ohms(klog#2124) |
NdFeB 1mm dia, 5mm thick |
0.0014 N/A at max |
TAMA |
IM |
- |
- |
- |
- |
IMMT1/2 (Type-C) TM |
39 turns ? |
NdFeB 2mm dia, 5mm thick |
|
high power |
IM |
- |
- |
- |
- |
PR2/3/M (Type-Bp) TM |
600 turns |
SmCo 6mm dia, 3mm thick |
0.129 N/A at max |
high power |
IM |
600 turns |
SmCo 10mm dia, 10mm thick |
1.26 N/A at max |
high power |
BS (Type-B) TM |
600 turns, ~11 Ohms |
SmCo 2mm dia, 3mm thick |
0.0138N/A at max |
low power |
IM |
600 turns, ~13 Ohms |
SmCo 10mm dia, 10mm thick |
1.25 N/A at max |
low power |
SR2/3/M (Type-B) TM |
600 turns |
SmCo 2mm dia, 5mm thick |
0.0225 N/A at max |
low power |
IM |
600 turns |
SmCo 10mm dia, 10mm thick |
1.26 N/A at max |
low power |
ITM/ETM (Cryopayload) TM |
100 turns, 17 Ohms (measured at room temp; estimated to be 0.6 Ohms for cryogenic) |
SmCo(?) 2mm dia, 2mm thick ? |
0.0015 N/A at max (measured at room temp with 88turns) |
low power |
IM |
600 turns, 57 Ohms (measured at room temp; estimated to be 2 Ohms for cryogenic) |
SmCo(?) 2mm dia, 2mm thick ? |
0.015 N/A at max (measured at room temp with 585turns) |
low power(with R65 and R97 700Ohm) |
Marionette |
600 turns, 57 Ohms (measured at room temp; estimated to be 2 Ohms for cryogenic) |
SmCo(?) 5mm dia, 13mm thick ? |
0.45 N/A at max (measured at room temp with 585turns) |
low power(with R65 and R97 700Ohm) |
Coil Drivers
TAMA coil driver has 50 Ohm, 20 mA/V. EL2099, 440 mA at max. Summary by Koji Arai is here.
Low Power Coil Driver (JGW-D1503507) has 7.8 kOhm at DC (1.258 kOhm at high frequency; pole at 50Hz, zero at 312 Hz), 0.128*1.33 mA/V at DC (voltage gain of 1.33 is applied in the driver). AD8671, 10 mA at max.
- Modified Low Power Coil Driver (for Type-A IM and Marionette) has 1.4 kOhm at DC (724 Ohm at high frequency; pole at 161Hz, zero at 312 Hz), 0.714*1.33 mA/V at DC (voltage gain of 1.33 is applied in the driver). AD8671, 10 mA at max.
High Power Coil Driver (JGW-D1503503) has 80 Ohm, 12.5 mA/V at DC. OPA548, 3 A at max.
TO DO
- Change low power coil driver gain (1.33 to 1) for cryopayload TM stage
- Actuation efficiency for cryopayload at cryogenic temperature
Heat
- Heat generated by coils for Type-A cryopayload is 2.2 mW at maximum
0.6 Ohm * (0.128*1.33 mA/V * 10 V)2 * 4 coils + 2 Ohm * (0.714*1.33 mA/V * 10 V)2 * 6 coils + 2 Ohm * (0.714*1.33 mA/V * 10 V)2 * 6 coils = 2.2 mW
Related Documents
Actuator Noise Modeling Report JGW-T1503453
BS Actuator Design (including design for SRs and PRs) JGW-T1504450
OSEM Coil/Magnet/Flag Calculation JGW-T1503239
Magnetic noise calculation for BS (and ETM/ITM, PRM/SRM) JGW-T1504459
Actuator design of KAGRA cryogenic payload JGW-G1605938 (at this point, designed coil turns were 88/585 but it was changed to 100/600 in the production stage)
Updated actuator design of KAGRA cryogenic payload JGW-G1706948