Updates on iKAGRA Installation and Configuration Changes

The report discusses changes in the iKAGRA configuration from Fabry-Perot Michelson Interferometer to Michelson Interferometer due to schedule constraints and budget limitations. The document outlines the revised schedule for installation tasks, shift applications, and the impact on the KAGRA project. Additionally, it provides insights into the challenges faced and proposed adjustments in the roadmap and budget for iKAGRA. Supporting images detail the revised schedule and the delayed procurement process. The significant shift in configuration aligns with the project's priorities and aims to streamline progress.

• iKAGRA
• Michelson Interferometer
• Configuration Changes
• Budget Constraints
• Installation Schedule

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1. 150205_SAITO SEO report 1. Overall schedule of iKAGRA installation/commissioning change to Michelson Interferometer 2. Scheduling of daily works for installation 3. Call for shift application form 4. Remaking roadmap and budget schedule in bKAGRA 1

2. SEO report 1. Overall schedule of iKAGRA installation/commissioning change to Michelson Interferometer 2. Scheduling of daily works for installation 3. Call for shift application form IMPORTANT ANNOUNCEMENT 2014 12 26, by Kajita PI Due to the very tight schedule for iKAGRA, to the limited manpower and the budget, and to the higher priority in bKAGRA, SEO, together with chiefs of the subgroups, has been discussing the possible change in the iKAGRA configuration. This, of course, included the technical feasibility studies. 4. Remaking roadmap and budget schedule in bKAGRA SEO proposed to EO the change in the iKAGRA configuration. EO examined this proposal and agreed with the proposal: THE iKAGRA CONFIGURATION will be MICHELSON INTERFEROMETER (3km arm length) rather than FABRY-PEROT MICHELSON INTERFEROMETER. As mentioned above the higher priority in the KAGRA project is bKAGRA. We do not expect any significant change in the schedule and scope of bKAGRA due to the change in the iKAGRA configuration. 2

3. Schedule of iKAGRA (previously planned FPMI) : 2014-2015 2013 2014 2015 III IV I II III IV I II III IV electricity ventilation drainage crane hanging anchor dust prevention coating clean booth network and PHS arm tube laying a chalk line carrying and anchoring flange fastening/leak test chamber marking anchoring wiring duct tubing girder drilling tunnel excavation laser room laser roomc-room, e-room c-room cryo other chambers Type-C, Type-Bp, BS Install / tune in chambers Laser and PMC setup mirror suspension PMC to MC input/output optics optical baffle (arm) target monitor (arm) vac pumping Geophysics interferometer Environment monitor during flange fastening/arm during flange fastening/arm bidding during flange fastening/arm Inst. test/operation preparation for install Jul 2015 commissioning Dec 2015 operation Oct 2014 input-optics installation 3

4. Schedule of iKAGRA (delay of VIS procurement) : 2014-2015 2013 2014 2015 III IV I II III IV I II III IV electricity ventilation drainage crane hanging anchor dust prevention coating clean booth network and PHS arm tube laying a chalk line carrying and anchoring flange fastening/leak test chamber marking anchoring wiring duct tubing girder drilling tunnel excavation laser room laser roomc-room, e-room c-room cryo other chambers Type-C, Type-Bp, BS Install / tune in chambers Laser and PMC setup mirror suspension PMC to MC input/output optics optical baffle (arm) target monitor (arm) vac pumping Geophysics interferometer Environment monitor during flange fastening/arm during flange fastening/arm bidding during flange fastening/arm Inst. test/operation preparation for install Jul 2015 commissioning Dec 2015 operation Oct 2014 input-optics installation 4

5. Schedule of VIS installation: iKAGRA iKAGRA schedule 2014 11 2015 10 12 1 2 3 4 5 6 7 8 9 10 11 12 Fabry-Perot-Michelson VIS installation Stack install MC suspension install Stack MC frame/payload procurement PR2 & PR3 PR2 & PR3 IXA & EXA (Xarm cavity) IYA & EYA (Yarm cavity) frame/payload procurement IXA & EXA frame/payload procurement IYA & EYA modifying prototype payload procurement BS BS Xarm commissioning Xarm commissioning Full commissioning Full commissioning Observation Obs. Michelson VIS installation Stack install MC suspension install Stack MC frame/payload procurement PR2 & PR3 PR2 & PR3 IXA & IYA frame/payload procurement payload procurement EXA & EYA EXA & EYA modifying prototype BS BS Michelson commissioning Michelson commissioning Observation Obs. 5 Dec 2015 operation

6. Schedule of iKAGRA (Michelson) : 2014-2015 2013 2014 2015 III IV I II III IV I II III IV electricity ventilation drainage crane hanging anchor dust prevention coating clean booth network and PHS arm tube laying a chalk line carrying and anchoring flange fastening/leak test chamber marking anchoring wiring duct tubing girder drilling tunnel excavation laser room laser roomc-room, e-room c-room cryo other chambers Type-C, Type-Bp, BS Install / tune in chambers Laser and PMC setup mirror suspension PMC to MC input/output optics optical baffle (arm) target monitor (arm) vac pumping Geophysics interferometer Environment monitor during flange fastening/arm during flange fastening/arm bidding during flange fastening/arm Inst. test/operation preparation for install Aug 2015 commissioning Dec 2015 operation Oct 2014 input-optics installation 6

7. iKAGRA configuration (previous plan) iKAGRA obs. Run in Dec. 2015 ~1 month Type-A isolator full-system test - Room-temp. test Sapphire (?), 23kg, 290K - Tall seismic isolator IP + GASF + Payload iKAGRA configuration - Room-temp. test masses suspended by Type-Bp payload - FPMI with 2.94 km arm cavities - Low laser power, w/o power recycling - On-site test of VIS and Cryo system ETM Y-arm ITM Shorter arm length by 61m MC BS X-arm IO Type-C system ITM ETM - Mode cleaner Silica, 0.5kg, 290K - Stack + Payload Cryogenic system test - Cryostat + Rad. shield duct - Cryo-cooler - Cryogenic payload - Fixed Type-A SAS Type-Bp payload - Test mass and Core optics (BS, FM,..) Silica, 10kg, 290K - Seismic isolator Table + GASF + Type-B Payload 7

8. iKAGRA configuration (Michelson Interferometer) iKAGRA obs. Run in Dec. 2015 ~1 month Type-A isolator full-system test - Room-temp. test Sapphire (?), 23kg, 290K - Tall seismic isolator IP + GASF + Payload iKAGRA configuration - Room-temp. test masses suspended by Type-Bp payload - MI with 2.94 km arm - Low laser power, w/o power recycling - On-site test of VIS and Cryo system ETM Y-arm Shorter arm length by 61m MC BS X-arm IO Type-C system ETM - Mode cleaner Silica, 0.5kg, 290K - Stack + Payload Cryogenic system test - Cryostat + Rad. shield duct - Cryo-cooler - Cryogenic payload - Fixed Type-A SAS Type-Bp payload - Test mass and Core optics (BS, FM,..) Silica, 10kg, 290K - Seismic isolator Table + GASF + Type-B Payload 8

9. iKAGRA configuration (Michelson Interferometer) iKAGRA obs. Run in Dec. 2015 ~1 month Type-A isolator full-system test - Room-temp. test Sapphire (?), 23kg, 290K - Tall seismic isolator IP + GASF + Payload iKAGRA configuration - Room-temp. test masses suspended by Type-Bp payload - MI with 2.94 km arm - Low laser power, w/o power recycling - On-site test of VIS and Cryo system iKAGRAis aimed **to confirm the operational scheme of 3-km baseline interferometer, the environmental condition, and layout accuracy inside the tunnel. **to gain understandings and experiences necessary for the observation with the final bKAGRA interferometer. ETM Y-arm In iKAGRA, we have to realize the followings; 1. One month operation [twice of 2-weeks stable operation] with 3-km room temperature Michelson interferometer. No requirements for the strain sensitivity, but debugging of technical noise sources should be done. Shorter arm length by 61m MC BS X-arm IO Type-C system 2. Full system test of data acquisition, transfer, and storage system down to the data- analysis building at Kamioka. First data-analysis pipeline to be tested off-line. 3. Check the environmental condition inside the tunnel, and layout accuracy. Humidity (<75%) and particle density (Class-4) inside the clean-booths ETM - Mode cleaner Silica, 0.5kg, 290K - Stack + Payload Cryogenic system test - Cryostat + Rad. shield duct - Cryo-cooler - Cryogenic payload - Fixed Type-A SAS Type-Bp payload Accuracy (within 2 mm) in laying chalk-line and setting chamber 4. Preparation and tuning of cryogenic system and tall vibration-isolation devices. Cool-down and re-warming time of the test mass inside the cryostat Installation and tuning procedure of the 5 stage vibration-isolation system - Test mass and Core optics (BS, FM,..) Silica, 10kg, 290K - Seismic isolator Table + GASF + Type-B Payload 9

10. 150205_SAITO SEO report 1. Overall schedule of iKAGRA installation/commissioning change to Michelson Interferometer 2. Scheduling of daily works for installation 3. Call for shift application form 4. Remaking roadmap and budget schedule in bKAGRA 10

11. Installation Scheduling for iKAGRA ----- Entrance submission ----- on-site dweller Contractors on-site (Safety control) EO GWPO Kamioka Branch SEO Installation Scheduler T. Uchiyama H. Ishizuka Y. Saito (Project Manager) M. Ando Y. Aso S. Kawamura S. Miyoki M. Ohashi (Site Manager) K. Somiya T. Suzuki Microsoft project Web site Entrance submission Sub system Sub system Sub system 10-minutes morning meeting for today s workers (daily) 11

12. 150205_SAITO SEO report 1. Overall schedule of iKAGRA installation/commissioning change to Michelson Interferometer 2. Scheduling of daily works for installation 3. Call for shift application form 4. Remaking roadmap and budget schedule in bKAGRA 12

13. Call for Shift on-site dweller EO SEO Task manager T. Uchiyama Y. Saito (Project Manager) M. Ando Y. Aso S. Kawamura S. Miyoki M. Ohashi (Site Manager) K. Somiya T. Suzuki Call for Shift collaborators Task requirement application Web site Sub system Sub system Sub system Contact with applicants/ Member choice 13

14. 150205_SAITO SEO report 1. Overall schedule of iKAGRA installation/commissioning change to Michelson Interferometer 2. Scheduling of daily works for installation 3. Call for shift application form 4. Remaking roadmap and budget schedule in bKAGRA 14

15. bKAGRA configuration first science run in FY2017 Type-A system ETM bKAGRA configuration - Cryogenic test masses - 3 km arm cavities - RSE with power recycling - Cryogenic test mass Sapphire, 23kg, 20K - Tall seismic isolator IP + GASF + Payload Y-arm ITM MC PRM BS X-arm IO Type-C system ITM ETM - Mode cleaner Silica, 0.5kg, 290K - Stack + Payload Type-B system SRM - Core optics (BS, SRM, ) Silica, 10kg, 290K - IP + GASF + Payload - Stack for aux. optics Type-Bp payload - Test mass and Core optics (BS, FM,..) Silica, 10kg, 290K - Seismic isolator Table + GASF + Type-B Payload 15

16. bKAGRA configuration first science run in FY2017 ++++++++++++++++++ Type-A system ETM In the last f2f meeting (Toyama, July 31, 2014) budget situation of KAGRA is very tight, due to an extra cost for excavation, due to higher amount of biddings than those originally estimated, bKAGRA configuration - Cryogenic test masses - 3 km arm cavities - RSE with power recycling due to some up-grade devices proposed by subs-systems. - Cryogenic test mass Sapphire, 23kg, 20K - Tall seismic isolator IP + GASF + Payload Y-arm One of the most possible scenario is to divide bKAGRA into two phases; bKAGRA-I (FY2017) = low power w/o recycling cryogenic interferometer operation bKAGRA-II (FY2019) = full configuration of bKAGRA ++++++++++++++++++ ITM MC PRM BS X-arm KAGRA has requested additional budget to the government, and it possibly comes at 2015. IO Type-C system Task force in SEO are now re-making the budget schedule and roadmap. * more accurate estimated cost and procurement schedule * attainable sensitivity in the time table * descoping some spec (drop functions) from the full-configuration ITM ETM - Mode cleaner Silica, 0.5kg, 290K - Stack + Payload Type-B system SRM - Core optics (BS, SRM, ) Silica, 10kg, 290K - IP + GASF + Payload - Stack for aux. optics Type-Bp payload KAGRA interferometer is to be first operated in 2015, then to be cryogenically operated in FY2017 It is to be noted that the constraints between KAGRA and governments are existing; - Test mass and Core optics (BS, FM,..) Silica, 10kg, 290K - Seismic isolator Table + GASF + Type-B Payload 16