Analog Electronics for Interferometer Control
Upcoming Request for AEL
Quantities (without spare) for chassis (not boards) we have to additionally make by the specified time are shown. Request from IOO+MIF(+IMC suspension?).
Name |
by 2016.10 |
by 2017.2 |
by 2017.5 |
by 2017.7 |
by full bKAGRA |
Produced |
High Power Coil Driver |
|
|
|
|
3? (only for IMC included) |
? |
Quad IQ Demodulator LSC |
|
|
|
|
7 |
5 |
Quad IQ Demodulator ASC |
+2 |
|
|
+4 |
22 |
0 |
RF Distribution Amplifier |
+1 |
|
|
+2 |
10 |
1(handmade) |
Common Mode Servo Board |
|
|
|
+1 |
4 |
0 |
Frequency Doubler |
|
|
|
+1 |
2 |
0 |
ISS Board |
|
+1? |
|
|
1 |
0 |
Phase Frequency Discreminator |
|
+1? |
|
|
1 |
0 |
VCO with PLL |
|
+2? |
|
|
2 |
0 |
Low noise VCOs
Electronics
Red rows: To be designed (or selected). Yellow rows: Not yet purchased, short of stock, or in production. Green rows: Ready for bKAGRA Phase 1. White rows: Ready for bKAGRA. Pink rows: taken cared by ToyamaU
Last update: Sept 11, 2017 (Added electronics for RF AM, updated status)
Name |
Height |
Schematics |
Power |
Description |
Needed |
Needed |
Produced |
Status |
for PSL |
||||||||
RF Oscillator Source |
2U |
AC |
for the time being (for auxiliary modulations like fPMC, fIMC, fALS, we should use cheaper fixed oscillator) |
5 |
7 |
6 |
Stored in ICRR, Hongo, and Toyama |
|
RF PD |
- |
+-18V |
has RF HI, RF LOW outputs(BNC), and DC output(Dsub 9pin, which includes +-18V) |
6 |
18 |
3+20+20 |
3 handmaking done; 40 arrived with diodes(20 for MIF, 20 without resonances); List |
|
DC PD |
- |
+-12V |
has DC output(BNC), needs power cable PDA-C-72 |
7 |
9 |
6+5 |
At Kamioka Branch |
|
TTFSS |
- |
from Interface |
|
1 |
1 |
1 |
At the site |
|
TTFSS Interface |
- |
+-17V,+-24V,+-200V |
|
1 |
1 |
1 |
At the site |
|
AOM Driver |
- |
Crystal Technology 1110AF-AEFO-1.5 |
+28V |
|
1 |
1 |
1 |
At the site, for reference cavity |
PZT Driver |
- |
? |
AC |
for periscope PZTs, 2ch |
1 |
1 |
1 |
At the site?? |
PMC Servo Board |
- |
from Interface |
|
1 |
1 |
1 |
At the site (basically copy of TTFSS) |
|
PMC Servo Board Interface |
- |
+-17V,+-24V,+-200V |
|
1 |
1 |
1 |
At the site (basically copy of TTFSS Interface) |
|
for IMC LSC |
||||||||
Quad IQ Demodulator LSC |
1U |
+-18V |
4 LOs for 4 demodulation channels |
1 |
7 |
5 |
At Kamioka Branch, additional requested to AEL (JGW-T1605487) |
|
Dual IQ Demodulator |
1U |
+-18V |
2 LOs for 2 demodulation channels, fast verison |
3 |
3 |
|
use QuadIQ for now |
|
Common Mode Servo Board |
2U |
+-17V,+-24V |
2 inputs, slow and fast outputs |
2 |
4 |
5 |
At Kamioka Branch List |
|
RF PD Interface Board |
1U |
+-18V |
for ribbon cables from 4 RF PDs, with whitening filter |
3 |
6 |
10 |
At Kamioka Branch |
|
for IMC ASC, better PSL |
||||||||
RF QPD |
- |
+-18V |
should have 4 RF outputs, 4 DC outputs |
8 |
14 |
5+15 |
5 for IMC, 15 for IFO at Kamioka Branch; List |
|
RF QPD Interface Board |
1U |
+- 18V |
for ribbon cables from 4 RF QPDs, without whitening filter |
3 |
4 |
5 |
At Kamioka Branch |
|
DC QPD |
- |
+-15V |
has 4 DC outputs(Dsub 15pin, which includes +-15V) use oplev QPD for the time being |
10 |
12 |
40 |
(including ones for oplevs, ones for green) |
|
DC QPD Interface Board |
1U |
+-18V |
for ribbon cables from 2 DC QPDs, with whitening filter |
5 |
8 |
20 |
At Kamioka Branch (including ones for oplevs) |
|
Quad IQ Demodulator ASC |
1U |
+-18V |
1 LO for 4 demodulation channels |
8 |
22 |
0 |
Requested to AEL (JGW-T1605488) |
|
RF Distribution Amplifier |
1U |
+-24V |
split into 8 |
4 |
10 |
1 |
Requested to AEL (JGW-T1605490) |
|
Delay Line Phase Shifter |
1U |
+15V? |
for 2 channels |
3 |
3 |
|
|
|
DC PD Interface Board |
- |
+-12V |
for 4 DC PDs, without whitening filter, on output tables |
5 |
6 |
|
|
|
for DRFPMI |
||||||||
Frequency Doubler |
1U |
+-17V,+-24V |
for sideband power monitor |
1 |
2 |
|
Requested to AEL (JGW-T1605492) |
|
Difference Frequency Generator |
1U? |
|
|
for nonresonant sidebands, 2 channels |
0 |
1 |
|
|
for ALS |
||||||||
RF PD for green |
- |
|
use IR circuit but change PD? |
2? |
2 |
|
|
|
BB PD for IR |
- |
|
for ALS PLL (we use IR beat for KAGRA, while aLIGO uses green beat) |
2? |
2 |
|
|
|
BB PD Interface Board |
1U? |
|
same for RF PD Interface? |
1? |
1 |
|
|
|
DC PD for green |
- |
+-12V |
has DC output, needs power cable PDA-C-72 |
2? |
2 |
|
|
|
DC QPD for green |
- |
+-15V |
has 4 DC outputs(Dsub 15pin, which includes +-15V) use oplev QPD for the time being |
4? |
4 |
40 |
(including ones for oplevs, ones for IR) |
|
Phase Frequency Discriminator |
1U |
+-17V,+-24V |
for ALS, 2 channels |
2? |
1 |
|
Made by ToyamaU? |
|
VCO with PLL |
2U |
+-17V,+-24V |
for PLL VCO, we will use E8663D |
2? |
2 |
|
Made by ToyamaU? |
|
for better sensitivity |
||||||||
DC PD in vacuum |
- |
|
for ISS and OMCTVAC |
0 |
3 |
|
|
|
DC QPD in vacuum |
- |
(LIGO-T0900423); also see this for the explanation of the 5th diode. |
|
bare QPD without amplifier |
0 |
10 |
|
|
DC QPD in vacuum for green |
- |
|
bare QPD without amplifier |
0 |
4 |
|
|
|
DC PD Amplifier |
? |
|
+-18V |
for DC PD in vacuum |
0 |
2 |
|
|
DC QPD Amplifier |
1U |
+-18V |
for ribbon cables from 2 DC QPDs in vacuum |
0 |
7 |
|
|
|
ISS Board |
? |
|
|
1? |
1 |
|
Made by ToyamaU? |
|
OMC Servo Board |
? |
|
|
|
0 |
1 |
|
|
RF Oscillator Source(Wenzel OCXO) |
2U |
|
|
0 |
7 |
|
|
|
EOM/AOM Driver |
? |
|
for RF AM stabilization, modulation amplitude adjustment |
0 |
3 |
|
|
References: awiki/RfDesign, awiki/LSC_Photodetectors, Cabling LIGO-D1200666
TO DO
- Details of ISS, ALS, OMC servo are uncertain at this point
Common Mode Servo list
Photodetector list
(Original) List of the Interferometer Detection Ports JGW-T1402982
Cable list
List of the ISC cables is available at this Google Spreadsheet.
System diagram
As-built rack diagram maintained by GDS group JGW-D1809427
For each rack
KAGRA ISC Electrical Components Layout JGW-D1402986
Position of digital system racks JGW-D1100425
What's inside the digital system racks JGW-D1402831
- Also see the followings for the latest design:
IOO rack: JGW-D1706814
IMC rack: JGW-D1707021
ALS0 and 1 racks: JGW-D1808696
LSC rack: JGW-D1809052
OMC0 and 1 racks: JGW-D1909823 JGW-D1909844
TMSX rack: JGW-D1809074
TMSY rack: JGW-G1910293
PSL
See JGW-D1402984 for cabling.
Name |
Height |
Description |
to ADC |
from DAC |
bKAGRAp1? |
RF Oscillator Source |
2U |
for fPMC sideband |
|
|
yes |
(RF splitter) |
- |
split fPMC into 2 for PSL EOM, PMCR LO |
|
|
yes |
PMC Servo Board |
- |
for PMC servo, receives PMCR, needs fPMC LO |
|
|
yes |
PMC Servo Board Interface |
- |
for PMC Servo Board |
|
|
yes |
TTFSS |
- |
for Refcav servo, receives REFCAVR, needs fIMC LO from IO rack |
|
|
yes |
TTFSS Interface |
- |
for TTFSS |
?? |
?? |
yes |
DC PD Interface Board |
- |
for PMCT, REFCAVT, RFAMR, RFAMT |
|
|
yes |
PZT Driver |
- |
for periscope PZTs |
|
BNCx2 |
yes |
Output Tables
Interface boxes for Thorlabs DC PDs are located at the respective output tables.
Name |
Height |
Description |
Location |
to ADC |
from DAC |
bKAGRAp1? |
DC PD Interface Board |
- |
for IMCT, (3ch left) |
IMC TRANS table -> IO rack |
Dsubx1(no whitening) |
|
yes |
DC PD Interface Board |
- |
for IMMT1T, (3ch left) |
IMMT1T pylon -> MMT rack |
Dsubx1(no whitening) |
|
yes |
DC PD Interface Board |
- |
for TRX, TRX_GR, (2ch left) |
TRX table -> EX4 rack |
Dsubx1(no whitening) |
|
yes |
DC PD Interface Board |
- |
for TRY, TRY_GR, (2ch left) |
TRY table -> EY4 rack |
Dsubx1(no whitening) |
|
yes |
DC PD Interface Board |
- |
for OMCT, (3ch left) |
AS table -> AS rack? |
Dsubx1(no whitening) |
|
|
IO racks
Located between PSL and MCF chamber. Generates RF for fIMC, f1, f2, f3, 2*f1, 2*f2, f3-f1, f3-f2, fALSX, and fALSY. Has servo circuits for FRC, IMC, and ISS. Takes care of PD/QPDs on PSL, IMC REFL, and IMC TRANS tables. Also takes care of equivalent PD/QPDs in vacuum.
Name |
Height |
Description |
to ADC |
from DAC |
bKAGRAp1? |
PD/QPD |
|||||
Dual IQ Demodulator |
1U |
for IMCR(fIMC), RFAMDLINE(fIMC) |
Dsubx1(no whitening) |
|
yes |
RF PD Interface Board |
1U |
for PMCR, REFCAVR, IMCR, (1ch left) |
Dsubx1(no whitening) |
|
yes |
RF QPD Interface Board |
1U |
for IMCR_A/B, (2ch left) |
Dsubx2(no whitening) |
|
yes |
DC QPD Interface Board |
1U |
for IP_A/B |
Dsubx2(whitened) |
|
yes |
DC QPD Interface Board |
1U |
for IMCT_A/B |
Dsubx2(whitened) |
|
yes |
DC QPD Amplifier |
1U |
for IMCTVAC_A/B |
Dsubx2(whitening) |
|
|
fIMC |
|||||
RF Oscillator Source |
2U |
for fIMC sideband (also for Refcav) |
|
|
yes |
RF Distribution Amplifier |
1U |
for fIMC. to PSL EOM, to Delay Line for Refcav, to Delay Line for IMC LSC, to IQ Demod ASC x 2, (3ch left) |
|
|
yes (by 2016.10) |
Delay Line Phase Shifter |
1U |
for TTFSS LO(Refcav lock), IMCR LO(IMC LSC) |
|
|
yes |
Common Mode Servo Board |
2U |
for IMC servo |
Dsubx3(no whitening) |
Dsubx1 |
yes |
Quad IQ Demodulator ASC |
1U |
for IMCR_A QPD(fIMC) |
Dsubx2(whitening) |
|
yes (by 2016.10) |
Quad IQ Demodulator ASC |
1U |
for IMCR_B QPD(fIMC) |
Dsubx2(whitening) |
|
yes (by 2016.10) |
f1 |
|||||
RF Oscillator Source |
2U |
for f1 sideband |
|
|
yes |
RF Distribution Amplifier |
1U |
for f1. to PSL EOM, to PSL EOAM, to MMT rack, to LSC racks, to Frequency Doubler, to Diff. Freq. Generator, (2ch left) |
|
|
yes |
Frequency Doubler |
1U |
f1 to 2*f1 for ISC racks |
|
|
yes (by 2017.7) |
f2 |
|||||
RF Oscillator Source |
2U |
for f2 sideband |
|
|
|
RF Distribution Amplifier |
1U |
for f2. to PSL EOM, to MMT rack to LSC racks, to Frequency Doubler, to Diff. Freq. Generator, (3ch left) |
|
|
|
Frequency Doubler |
1U |
f1 to 2*f1 for ISC racks |
|
|
|
f3 |
|||||
RF Oscillator Source |
2U |
for f3 to splitter |
|
|
|
(RF splitter) |
- |
split f3 into 2 for Diff. Freq. Generator |
|
|
|
Diff. Freq. Generator |
1U? |
make f3-f1 for ISC racks, make f3-f2 for ISC racks |
|
|
|
fALSX,fALSY |
|||||
RF Oscillator Source |
2U |
for fALSX sideband for ISC racks |
|
|
(by 2017.2) |
RF Oscillator Source |
2U |
for fALSY sideband for ISC racks |
|
|
(by 2017.2) |
Others |
|||||
ISS Board |
?? |
|
?? |
?? |
(by 2017.2) |
MMT rack
Located near PRM chamber. Takes care of PD/QPDs on IMMT1 and IMMT2 tables. Also takes care of equivalent PD/QPDs in vacuum.
Name |
Height |
Description |
to ADC |
from DAC |
iKAGRA? |
PD/QPD |
|||||
Quad IQ Demodulator LSC |
1U |
for IMMT2T(f1), IMMT2T(f2), (2ch left) |
Dsubx1(whitening) |
|
|
RF PD Interface Board |
1U |
for IMMT2T, (3ch left) |
Dsubx1(no whitening) |
|
yes |
DC PD Amplifier |
1U |
for IMMT1TVAC, IMMT2TVAC, (2ch left) |
Dsubx1(whitening) |
|
|
DC QPD Interface Board |
1U |
for IMMT2T_A/B |
Dsubx2(whitened) |
|
yes |
DC QPD Amplifier |
1U |
for IMMT2TVAC_A/B |
Dsubx2(whitening) |
|
|
ISC racks
Stands for LSC, ASC1, ASC2 and AUX racks located between PR3 and PR2 chambers. Has servo circuits for CARM, ALSX, and ALSY. Takes care of PD/QPDs on REFL, POP, POS, POX, POY, and AS tables. Also takes care of equivalent PD/QPDs in vacuum.
Name |
Height |
Description |
to ADC |
from DAC |
bKAGRAp1? |
PD/QPD |
|||||
Dual IQ Demodulator |
1U |
for REFL(f1), REFL(f2) |
Dsubx1(no whitening) |
|
yes |
Dual IQ Demodulator |
1U |
for POP_GR(fALSY), POS_GR(fALSX) |
Dsubx1(no whitening) |
|
(by 2017.2) |
Quad IQ Demodulator LSC |
1U |
for REFLNRSB(f3-f1), REFLNRSB(f3-f2), AS(f1), ASVAC(f1) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator LSC |
1U |
for POP(f1), POP(f2), SPOP(2*f1), SPOP(2*f2) |
Dsubx2(whitening) |
|
yes |
Quad IQ Demodulator LSC |
1U |
for SPOS(2*f1), SPOS(2*f2), (2ch left) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator LSC |
1U |
for POX(f1), POX(f2), POY(f1), POY(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator LSC |
1U |
for REFLVAC(f1), REFLVAC(f2), POPVAC(f1), POPVAC(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator LSC |
1U |
for POXVAC(f1), POXVAC(f2), POYVAC(f1), POYVAC(f2) |
Dsubx2(whitening) |
|
|
RF PD Interface Board |
1U |
for REFL, REFLNRSB, AS, SPOS |
Dsubx1(no whitening) |
|
yes |
RF PD Interface Board |
1U |
for POX, POY, POP, SPOP |
Dsubx1(no whitening) |
|
|
RF PD Interface Board |
1U |
for POP_GR, POS_GR, POXVAC, POYVAC |
Dsubx1(no whitening) |
|
|
RF PD Interface Board |
1U |
for REFLVAC, POPVAC, ASVAC, (1ch left) |
Dsubx1(no whitening) |
|
|
BB PD Interface Board |
1U |
for PLLX, PLLY, (2ch left?) |
Dsubx1(no whitening) |
|
|
RF QPD Interface Board |
1U |
for REFL_A/B, POP_A/B |
Dsubx4(no whitening) |
|
yes |
RF QPD Interface Board |
1U |
for AS_A/B, ASVAC_A/B |
Dsubx4(no whitening) |
|
yes |
RF QPD Interface Board |
1U |
for REFLVAC_A/B, POPVAC_A/B |
Dsubx4(no whitening) |
|
|
f1 |
|||||
RF Distribution Amplifier |
1U |
for f1. to Delay Line for CARM, POP LO, POX LO, POY LO, AS LO, REFLVAC LO, ASVAC LO, to RF Dist. |
|
|
yes (by 2017.7) |
RF Distribution Amplifier |
1U |
for f1. to POPVAC LO, POXVAC LO, POYVAC LO, IQ Demod ASC x 3, to RF Dist. |
|
|
|
RF Distribution Amplifier |
1U |
for f1. IQ Demod ASC x 7, to RF Dist. |
|
|
yes (by 2017.7) |
RF Distribution Amplifier |
1U |
for f1. IQ Demod ASC x 2, (6ch left) |
|
|
|
Delay Line Phase Shifter |
1U |
for REFL LO(f1, CARM), REFL LO(f2, CARM) |
|
|
yes |
Common Mode Servo Board |
2U |
for CARM servo |
Dsubx3(no whitening) |
Dsubx1 |
yes |
Quad IQ Demodulator ASC |
1U |
for REFL_A QPD(f1) |
Dsubx2(whitening) |
|
yes (by 2017.7) |
Quad IQ Demodulator ASC |
1U |
for REFL_B QPD(f1) |
Dsubx2(whitening) |
|
yes (by 2017.7) |
Quad IQ Demodulator ASC |
1U |
for POP_A QPD(f1) |
Dsubx2(whitening) |
|
yes (by 2017.7) |
Quad IQ Demodulator ASC |
1U |
for POP_B QPD(f1) |
Dsubx2(whitening) |
|
yes (by 2017.7) |
Quad IQ Demodulator ASC |
1U |
for AS_A QPD(f1) |
Dsubx2(whitening) |
|
yes (by 2017.7) |
Quad IQ Demodulator ASC |
1U |
for AS_B QPD(f1) |
Dsubx2(whitening) |
|
yes (by 2017.7) |
Quad IQ Demodulator ASC |
1U |
for REFLVAC_A QPD(f1) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for REFLVAC_B QPD(f1) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for POPVAC_A QPD(f1) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for POPVAC_B QPD(f1) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for ASVAC_A QPD(f1) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for ASVAC_B QPD(f1) |
Dsubx2(whitening) |
|
|
f2 |
|||||
RF Distribution Amplifier |
1U |
for f2. to Delay Line for CARM, POP LO, POX LO, POY LO, REFLVAC LO, POPVAC LO, POXVAC LO, RF Dist. |
|
|
|
RF Distribution Amplifier |
1U |
for f2. to POYVAC LO, RF Dist., (6ch left) |
|
|
|
RF Distribution Amplifier |
1U |
for f2. IQ Demod ASC x 8 |
|
|
|
Quad IQ Demodulator ASC |
1U |
for REFL_A QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for REFL_B QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for POP_A QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for POP_B QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for REFLVAC_A QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for REFLVAC_B QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for POPVAC_A QPD(f2) |
Dsubx2(whitening) |
|
|
Quad IQ Demodulator ASC |
1U |
for POPVAC_B QPD(f2) |
Dsubx2(whitening) |
|
|
2*f1,2*f2 |
|||||
(RF splitter) |
- |
split 2*f1 into 2 for SPOP LO, SPOS LO |
|
|
|
(RF splitter) |
- |
split 2*f2 into 2 for SPOP LO, SPOS LO |
|
|
|
f3-f1,f3-f2 |
|||||
|
|||||
fALSX,fALSY |
|||||
(RF splitter) |
- |
split fALSX into 2 for POP EOM, Delay Line for ALSX |
|
|
(by 2017.2) |
Delay Line Phase Shifter |
1U |
for POP_GR LO(ALSX), POS_GR LO(ALSY) |
|
|
(by 2017.2) |
Common Mode Servo Board |
2U |
for ALSX servo |
Dsubx3(no whitening) |
Dsubx1 |
|
(RF splitter) |
- |
split fALSY into 2 for POS EOM, Delay Line for ALSY |
|
|
|
Common Mode Servo Board |
2U |
for ALSY servo |
Dsubx3(no whitening) |
Dsubx1 |
|
Phase Frequency Discriminator |
1U |
for ALSX, ALSY |
?? |
?? |
(by 2017.2) |
VCO with PLL |
2U |
for ALSX |
?? |
?? |
(by 2017.2) |
VCO with PLL |
2U |
for ALSY |
?? |
?? |
(by 2017.2) |
EX4 rack
Located close to EXC chamber. Takes care of PD/QPDs on TRX table. Also takes care of equivalent PD/QPDs in vacuum.
Name |
Height |
Description |
to ADC |
from DAC |
bKAGRAp1? |
PD/QPD |
|||||
DC QPD Interface Board |
1U |
for TRX_A/B |
Dsubx2(whitened) |
|
yes |
DC QPD Interface Board |
1U |
for TRX_GR_A/B |
Dsubx2(whitened) |
|
yes |
DC QPD Amplifier |
1U |
for TRXVAC_A/B |
Dsubx2(whitening) |
|
|
DC QPD Amplifier |
1U |
for TRXVAC_GR_A/B |
Dsubx2(whitening) |
|
|
EY4 rack
Located close to EYC chamber. Components should be the same as those in EX4.
AS rack
Should be located close to OMM chamber. Takes care of PD/QPDs for OMC servo.
Name |
Height |
Description |
to ADC |
from DAC |
bKAGRAp1? |
PD/QPD |
|||||
DC PD Amplifier |
- |
for OMCTVAC, (3ch left) |
Dsubx1(whitening) |
|
|
DC QPD Interface Board |
1U |
for OMCT_A/B |
Dsubx2(whitened) |
|
|
DC QPD Amplifier |
1U |
for OMCTVAC_A/B |
Dsubx2(whitening) |
|
|
Others |
|||||
OMC Servo board |
?? |
for OMC lock |
?? |
?? |
|
Plan (as of 2012-08)
- Test fabrication of RF PD (by the end of September ?, test in October)
- Compile other analog circuit designs from LIGO into KAGRA spec. (by the end of October)
- Design frequency stabilization related circuits with NAOJ group (by the end of FY2012)