1. Arm Length Stabilization Conceptual Configuration Yuta Michimura Department of Physics, University of Tokyo JGW-T1605353November 14, 2016

2. Candidate1 (aLIGO-like) 2 Ref Cav IMC ~ 80 MHz AOM ~ 80 MHz AOM AUX X ~ 40 MHz PLL PDH SHG ~ offset ALS COMM AUX Y ~ 40 MHz PLL ~ offset 80 MHz ALS DIFF FSS PSL PDH

3. Candidate2 (simplified-aLIGO) Ref Cav IMC ~ 80 MHz AOM AUX X ~ 40 MHz PLL PDH ~ offset ALS COMM AUX Y ~ 40 MHz PLL ~ offset 40 MHz FSS PSL PDH ALS DIFF 3

4. Candidate3 (Tatsumi/Arai/Aso) Ref Cav IMC ~ 80 MHz AOM AUX X ~ 40 MHz PLL PDH AUX Y ~ 40 MHz PLL FSS PSL PDH AOM 4 offset

5. Candidate4 (hybrid) Ref Cav IMC ~ 80 MHz AOM AUX X ~ 40 MHz PLL PDH AUX Y ~ 40 MHz PLL FSS PSL PDH AOM 5 offset ALS COMM ALS DIFF

6. Where to put PLL setup for PSL vs AUX X/Y Where to put green beat setup for ALS COMM Where to put green beat setup for ALS DIFF Plan 1: All at PSL clean booth - need two fibers to send AUX green to POS/POP table - enough space for optics at PSL table? [Nakano] - enough space for electronics at IOO racks? [Michimura] -> yes Plan 2: AUX X at POP, AUX Y at POS - need two fibers to send PSL green to POS/POP table beat for PLL also with green? - need one fiber to send AUX X green to POS - enough space for electronics at ISC racks? [Michimura] -> yes Considerations 6

7. Conceptual drawing made by Kambara to be fixed [Kambara] Setup for Table-Top Experiment? 7

8. to be fixed [Moriwaki] very rough schedule 2016.7-10: ALS design 2016.10-2017.9: Table-top experiment at Univ. Toyama 2017.5-2017.6: BRT installation at Kamioka 2017.6: PRs and BS ready (no ETM yet) 2017.7?-??: GreenX installation at Kamioka? 2017.10-2018.3: GreenX/Y installation at Kamioka ? 2018.8: ITM/ETM CRYp installation complete 2018.9-: ALS experiment at Kamioka Schedule 8

9. aLIGO configuration https://alog.ligo- wa.caltech.edu/aLOG/index.php?callRep=11083 http://gwdoc.icrr.u-tokyo.ac.jp/cgi- bin/private/DocDB/ShowDocument?docid=1895https://alog.ligo- wa.caltech.edu/aLOG/index.php?callRep=11083http://gwdoc.icrr.u-tokyo.ac.jp/cgi- bin/private/DocDB/ShowDocument?docid=1895 Study by Tasumi-san et al. in 2011-2012 https://granite.phys.s.u- tokyo.ac.jp/svn/Private/trunk/LCGTbackup/GreenLock/ http://gwdoc.icrr.u-tokyo.ac.jp/cgi- bin/private/DocDB/ShowDocument?docid=788 http://gwdoc.icrr.u-tokyo.ac.jp/cgi- bin/private/DocDB/ShowDocument?docid=1268https://granite.phys.s.u- tokyo.ac.jp/svn/Private/trunk/LCGTbackup/GreenLock/http://gwdoc.icrr.u-tokyo.ac.jp/cgi- bin/private/DocDB/ShowDocument?docid=788http://gwdoc.icrr.u-tokyo.ac.jp/cgi- bin/private/DocDB/ShowDocument?docid=1268 Releated References 9