1. Cartoon of the optical layout around IMC, IFI and IMM
bKAGRA Early Phase
JGW-T
Yuta Michimura
Not to scale at all.
Pick-off mirror layout not real.
― main beam
― REFL beam
(reflected beam from the main interferometer)
IMMT1T beam is IMMT1 transmitted beam from IFI to IMMT1
IMMT2T beam is IMMT2 transmitted beam from IMMT1 to IMMT2
MCE
MCe TRANS
MCE
thick
On 1mx1m table
IMMT2T for RFAM monitor (1 RF PD)
and beam jitter monitoring (2 DC QPDs)
IMMT2T
IMMT2T
MCF
IFI
IMM
thick
IMMT2
to PRM
POM
STM2
thick
IFI
IMMT1
STM1
from PSL
thick
IMMT1T
thick
IMC REFL
REFL
IMC REFL
REFL
On oplev pylon
IMMT1T for ISS
(2 DC PDs)
and beam jitter
monitoring (1 DC QPD)

2. Cartoon of the optical layout around IMC, IFI and IMM
bKAGRA Final Phase ?
JGW-T
Yuta Michimura
Not to scale at all.
Pick-off mirror layout not real.
― main beam
― REFL beam
(reflected beam from the main interferometer)
IMMT1T beam is IMMT1 transmitted beam from IFI to IMMT1
IMMT2T beam is IMMT2 transmitted beam from IMMT1 to IMMT2
MCE
MCe TRANS
MCE
in-vac
2 DC QPDs
thick
IMMT2T
IMMT2T
in-vac
2 DC QPDs (& 1 RF PD)
MCF
IFI
IMM
thick
IMMT2
to PRM
in-vac
ISS DC PDs
POM
STM2
thick
IFI
IMMT1
STM1
from PSL
thick
IMMT1T
thick
IMC REFL
REFL
IMC REFL
REFL