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 * Magnetic noise calculation for BS (and ETM/ITM, PRM/SRM) [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=4459|JGW-T1504459]]

bKAGRA Suspensions Actuator Design Summary

suspension and stage

coil

magnet

coil-magnet

coil driver

MCi/e/o (Type-C) TM

40 turns

NdFeB 1mm dia, 5mm thick

0.0014 N/A at max

TAMA

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

1.12 N/A at max

high power

BS (Type-B) TM

600 turns

SmCo 2mm dia, 3mm thick

0.0313N/A at max

low power

IM

600 turns

SmCo 10mm dia, 10mm thick

1.12 N/A at max

low power

SR2/3/M (Type-B) TM

600 turns

SmCo 2mm dia, 5mm thick

N/A at max

low power

IM

600 turns

SmCo 10mm dia, 10mm thick

1.12 N/A at max

low power

ITM/ETM (Cryopayload) TM

600/500 turns(?)

SmCo(?) 2mm dia, 2mm thick

???

???

IM

???

???

???

???

Coil Drivers

  • TAMA coil driver has 50 Ohm, 20 mA/V. EL2099, 440 mA at max.

  • Low Power Coil Driver (JGW-D1503507) has 7.8 kOhm at DC (1.3 kOhm above 312 Hz), 0.128 mA/V at DC. AD8671, 10 mA at max.

  • High Power Coil Driver (JGW-D1503503) has 73 Ohm, 13.6 mA/V at DC. OPA548, 3 A at max.

KAGRA/Subgroups/VIS/ActuatorDesign (last edited 2017-07-21 12:13:39 by YutaMichimura)