Status of the KAGRA Project

Transcription

1 Status of the KAGRA Project Takaaki Kajita, for the KAGRA collaboration (~230 members) ICRR, Univ. of Tokyo Kajita_at_icrr.u-tokyo.ac.jp GWPAW2015 June, 2015, Osaka

2 Outline Introduction: Overview of KAGRA Key features Science examples Status of the KAGRA construction (ikagra) Plan toward the cryogenic operation (bkagra) Joining the Global GW network Summary KAGRA project 2

3 Introduction: Overview of KAGRA KAGRA collaboration 10 countries, ~230 members KAGRA project 3

4 Key features of KAGRA We are here today. The detector will be constructed underground Kamioka. Reduction of seismic noise (to approximately 1/100). Very high sensitivity. Cryogenic mirrors will be used to reduce the thermal noise (in the 2 nd phase). KAGRA project 4

5 Mozumi Location KAGRA surface facility Super- Kamiokande Toyama airport 40min. by car New Atotsu Present mine entrance We are here today. KAGRA project 5

6 Sources of Gravitational Waves 1. Coalescence of neutron star binaries 2. Coalescence of black hole binaries 3. Core collapse of massive stars (Supernova) (good location; Super-Kamiokande at the same site) 4. Rotation of pulsars Merger inspiral Blackhole quasi-normal mode msec KAGRA project 6

7 Sensitivities GWIC report (2010) Ad.-LIGO, Ad-Virgo, KAGRA similar design sensitivities KAGRA KAGRA project 7

8 Expected NS-NS Coalescence signal BH Ringdown (2.8M Sun ) Expected signal rate : ~10 / year 8 KAGRA project 8

9 Supernova Various possible gravitational wave emission mechanism: Core collapse and bounce Rotational non-axisymmetric instabilities of proto-neutron star Post-bounce convection Neutrino (Super-K) Example collapse and bounce wave form with 2 different EoS Dimmelmeier et al [PRD 78, ] msec KAGRA project 9

10 Status of the KAGRA construction (ikagra) KAGRA project 10

11 Time line (Construction and Observation) Calendar year Project start Tunnel excavation ikagra bkagra operation operation Adv. Optics system and tests Cryogenic system Today The construction/operation plan is in 2 stages: At the end of 2015, non-cryogenic operation (ikagra). Starting operation with cryogenic system in JFY 2017 (bkagra). (High sensitivity operation in?) KAGRA project 11

12 ikagra ( ~ 2015) ikagra and bkagra bkagra Simple Michelson interferometer with: room temperature operation and 2W class laser. However, full end-to-end (relatively short) observation, in order to experience the operation and to understand the potential problems as soon as possible. Full bkagra with; power and signal recycling, cryogenic sapphire mirrors, and ~180W laser. KAGRA project 12

13 ikagra on-site schedule ( ) (planed in 2014) Calendar year Electricity Ventilation Drain Crane & Hanging anchor Dust prevention coating Clean booth Network and PHS Arm tubes Chambers Mirror suspension Input optics Optical baffles etc Vacuum pumps ( ) ( ) ( ) ( ) Tunnel excavation Physicist-like works Commissioning ikagra operation KAGRA project 13

14 Tunnel excavation New Atotsu entrance End of April, 2012 Mid June, 2012 KAGRA project 14

15 Excavation completed at the end of March 2014 Excavation completion ceremony on July 4, Y-arm X-arm KAGRA project 15

16 Status Connection and the leak tests of 3km X 3km beam tubes have been finished. X arm tunnel and vacuum tubes Y arm tunnel and vacuum tubes KAGRA project 16

17 Status All the vacuum tanks located (slightly old photo). Clean booth construction (planed for JFY2014) finished. Y-arm X-arm Laser entrance KAGRA project 17

18 Underground water and KAGRA tunnel optical plane of interferometer X-arm horizontal plane at X end Y-arm horizontal plane at Y end ITMY BS O (BS) ITMX horizontal plane at center room X-arm EXA EXC EYC Y-arm O Center room Water to lower level Water to outside KAGRA project 18

19 Status (some delay ) The underground water has been (much) more than expected, in particular during spring (due to melting snow). It has been impossible to install the in-vacuum devises. Additional civil-engineering work to minimize the effect of the water during this winter-spring. Rescheduling of the installation and commissioning works KAGRA project 19

20 Water proof of the experimental rooms Walls and the floor of the Center and X and Y end rooms have been coated by plastic. But that was not good enough. Therefore, plastic sheets were used to cover the roof and wall. But this is still not perfect. We will have another roof on top of the clean booths soon. KAGRA project 20

21 Installation of in-vacuum equipment resumed Y-arm X-arm Laser Vacuum tank for Input Mode Cleaner (June 2015) 21 KAGRA project 21

22 Testing seismic attenuation system at TAMA Seismic Attenuation System (for BS ad SR systems) Dummy mirror (Al) in the TAMA tank suspended by the SAS. Installation of the SAS system into the TAMA vacuum tank (May 2015). 22 KAGRA project 22

23 ikagra Laser system Preparation of the ikagra laser (since Nov. 2014). (ISO class 1 achieved and has been kept). ikagra will use low power laser (2W). (180W class laser in bkagra) Laser Y-arm X-arm KAGRA project 23

24 ikagra digital system Computer room at front area in the mine: end of December of 2014 Movement of racks, computers, DC powers: Jan 2015 Network connection: in Feb. Construction of electric panel: Feb March KAGRA project 24

25 GPS antenna Mozumi Entrance Network for controls and DAQ RFM RT control signal: very low latency DAQ GW data: huge amount, low latency Timing: Synchronization for all RT PC and ADC/DAC TCP/IP: EPICS, NFS, network boot GW buildings at Kamioka Remote control Data storage Main Data storage Entrance to the KAGRA facility Low latency analysis (3PB/5years) Osaka city U., Osaka U. (150TiB/5 years) KAGRA project 25

26 Office building New office building to be built in (340m 2 ). KAGRA office (from Hida-city, since 2012, 140m 2 ) KAGRA project 26

27 Control room building) KAGRA project 27

28 Updated ikagra on-site schedule (2015) Month in 2015 Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Preparation for site works Input optics commissioning Remaining clean booths Mode cleaner installation and lock Vibration isolation installation and commissioning Auxiliary optics (optical lever etc) Simplified version of the updated schedule by Uchiyama-san will be shown here. Commissioning ikagra run Rescheduled taking the water problem into account Still hoping to have the ikagra operation in Dec KAGRA project 28

29 Plan toward the cryogenic operation (bkagra) KAGRA project 29

30 2 nd floor Cryogenic mirrors and cryostat Rock Cryo-shield tube Cryo shield Cryo-payload Cryo-mirror 1 st floor ~14m Vibration isolation system (@room temp.) Cryo-cooler 4 cryogenic mirrors KAGRA project 30

31 Status of construction: Cryogenic system Feb Cryostat testing at Toshiba Co. Aug All cryostats and the relevant components installed in the KAGRA tunnel. KAGRA project 31

32 Status of preparation: Sapphire mirror 4 Sapphire crystals (C-axis, 22cmφ, 15cm t) have been delivered. (4 more to come). E.Hirose et al., PRD 89, (2014) Surface roughness (test polishing with 200mmφ) 0.24nm r.m.s. over 140mmφ 0.48nm r.m.s. over 180mmφ (OK!) KAGRA project 32

33 And much more going on 210 W KAGRA project 33

34 Data analysis activities KAGALI Development KAGRA data analysis group is developing KAGRA s data analysis library called KAGra Algorithmic LIbrary or KAGALI. Compact Binary Coalescence (CBC) Pipeline development for frequency domain matched filtering (MF) Low latency analysis (time domain MF) (Osaka CU) : components preparation. Bayesian parameter estimation : Basic study with KOREAN group Alert sending system to EM partners (multi-messenger astronomy) Burst Development of single detector search pipeline. Data Retrieving, Data Conditioning, Event Selection : implemented. Parameter Estimation : In progress. Continuous Wave(CW) Developing codes using the resampling technique. KAGRA project 34

35 Joining the global GW network Ad. LIGO GEO-HF KAGRA Ad. Virgo LIGO-India The scientific output will be maximized by the global network. KAGRA has to learn various experiences / technologies from the existing interferometers. KAGRA will join the worldwide network of gravitational wave detection / astronomy. MOU between LSC/Virgo/KAGRA. KAGRA project 35

36 Importance of Global GW Network: Angular res. Wen and Chen, arxiv: 1003:2504 Determination of source sky position: 95%CL, supernova, S/N =10 LIGO (L+H) + Virgo LIGO (L+H) + Virgo +KAGRA LIGO(L+H)+Virgo Of course, the addition of LIGO- India will further improve the performance. KAGRA project 36

37 Follow-ups/counterparts partners of KAGRA Grants-in-Aid for Scientific Research New developments in astrophysics through multimessenger observations of gravitational wave sources, PI: T. Nakamura Xray monitor GW data analysis Optical, Radio Multi-messenger astro Understanding GW sources theory Neutrino Fast processing of KAGRA data Mutually followups with EM and neutrinos Further science on GW data analysis KAGRA project 37

38 Summary KAGRA is a unique GW interferometer with the underground site and the cryogenic technology. The underground water during spring is a problem. Due to this problem, the KAGRA detector construction has been delayed for several months. But, we would like to keep the overall schedule as we initially planed: Initial operation (ikagra) in late We have to work really hard! We plan to start the full cryogenic operation within JFY 2017, and to play an important role as a member of the global GW network. KAGRA would like to contribute to the global network of gravitational wave detection/astronomy. KAGRA project 38