1. Yuta Michimura Department of Physics, University of Tokyo
ELiTES 5th general meeting
Feb 8, 2017
Status of KAGRA
Yuta Michimura
Department of Physics, University of Tokyo

2. KAGRA Project Constructed in Kamioka mine Underground and cryogenic
300+ collaborators from 90+ institutes
Kamioka

3. Roadmap of KAGRA
Completed first test run at room temperature. Working for cryogenic test run.
Baseline KAGRA (bKAGRA) in 3 phases.
2016
2017
2018
2019
2020
Suspension installation
Cryogenics development
Cryo. payload installation
Cryo. payload upgrade
Cool down
Cool down
IFO upgrade
Noise hunting
Initial KAGRA
Michelson at room temp.
Test run
Phase 1
Michelson at cryogenic temp.
Test run
Phase 2
RSE at room temp.
Test run
Phase 3
RSE at cryogenic temp.
Observation run

4. Observation Scenario With 25-40 Mpc in 2020, 40-140 Mpc in 2021
Living Reviews in Relativity 19, 1 (2016)
to be updated

5. KAGRA Full Configuration
RSE interferometer
Sapphire test masses at 23 K
ETMY
Sapphire
23 K
3 km
IMC
ITMY
PRM
PR2
IFI
ITMX
ETMX
Laser
1064 nm
200 W
3 km BS
PR3
SR2
SR3
SRM
GW signal

6. Initial KAGRA Configuration
3 km Michelson at room temperature
Low power
Simplified suspension
At air pressure
ETMY
IMC
PR2
IFI
ETMX
Laser
1064 nm
200 W BS
PR3
GW Signal

7. iKAGRA Test Run in 2016 Period - March 25 to 31 - April 11 to 25
Purpose - confirm layout of the 3 km vacuum ducts - test controls, data transfer, observation shift, etc. - get environmental data - obtain experiences of the management and operation of the km-class interferometer

8. iKAGRA Sensitivity ~3e-15 /rtHz @ 100 Hz
Limited by seismic noise, acoustic noise and ADC noise
Reduction possible in bKAGRA
seismic noise
acoustic
noise
ADC noise
plot by T. Shimoda, M. Nakano, Y. Michimura

9. Data Transfer
Real time transfer to ICRR Kashiwa and Osaka City Univ. (~3 sec latency, ~ 200 MB/sec)
Delayed mirroring at Academia Sinica, Taiwan and KISTI, Daejeon
7.5 TB in total
figure by N. Kanda

10. Hardware Injection Right after 2nd iKAGRA run
signal injection
Right after 2nd iKAGRA run
Gravitational waveforms of CBC, Supernovae, etc.
Important end-to-end test
Laser
Data Acquisition
Transfer
Analysis
GW？

11. Next step: bKAGRA Phase 1
3 km Michelson
Sapphire ETMs at cryogenic temperature
Deadline: March 2018
ETMY
Cryogenic
sapphire
IMC
PRM
PR2
IFI
ETMX
Laser
1064 nm
2 W
misaligned BS
PR3
SR2
SR3
GW signal

12. bKAGRA Phase 1 Schedule More suspensions, cryogenics, PSL upgrade PR3
2017
2018 1 2 3 4 5 6 7 8 9 10 11 12
PR3
PRM
PR2 BS
SR2
SR3
ETMY upper
ETMX upper
ETMY
cryo-payload
ETMX
cryo-payload
ETMs coating
HCB
ETMY cool down
PSL upgrade
ETMX
cool down
IMC
initial alignment
Lock

13. Suspension Installation
Test hanging, pre-assembly on-going at the site
ETMY BS
PR3

14. Cryogenics
Magnetic noise, vibration measurements at cryostats at the site on-going
Cryopayload test at KEK, HCB test at NAOJ
Risk of ETM coating delay (preparing spares)
dummy mirror
accelerometer
ear

15. Input Optics Upgrade Input Mode Cleaner (IMC) magnets replaced
Input Mode Matching Telescope (IMMT) suspensions installed
iKAGRA Pre-stabilized Laser (PSL) disassembled, bKAGRA PSL being assembled
IMMT1

16. Summary
Successfully completed the first test run at room temperature (iKAGRA)
Working hard for the first cryogenic test run by March 2018 (bKAGRA Phase 1)
The first observation run in ~2020
Stay tuned to KAGRA elog (klog)

17. Extra Slides

18. KAGRA Sensitivity
If sapphire mirrors are at 23 K, input power is at 55 W