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15:00-16:30 @ See'''Vogh | 15:00-16:30 @ See''''Vogh |
Minutes of the Special VIS+ISC Meeting on BS Magnets (Nov 4 2015)
15:00-16:30 @ See'Vogh Participants: Aso, Flaminio, R. Takahashi, Barton. K. Yamamoto, Hirose, Shimoda, Miyamoto
Use 2mm dia, 3mm long SmCo magnets (Ni coated) for BS TM. Use 2mm dia, 5mm long SmCo magnets (Ni coated) for SRM/SR2/SR3 TMs.
Volume of the current magnet for BS in KAGRA is 85mm2, whereas that for AdVirgo is 2.6mm2. Also, actuation efficiency of BS TM for KAGRA is 200 times larger than that of AdVirgo. SmCo is a bit brittler than NdFeB, but we can be careful enough since aLIGO and AdVirgo people are currently using them. Also, Ni coated SmCo is available. LIGO-T0900611 summarizes the difference between SmCo and NdFeB. Conclusions
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