Bea eam pos osition on mon onitor or system em of of KA KAGR GRA Phot oton on Calibrator or 宍戸高治 Takaharu Shishido （ The Graduate University for Advanced Studies ） on the behalf of KAGRA cal group The 3rd KAGRA International Workshop, 5/21-22 2017 1 @Academia Sinica, Taipei
Outline 1.Calibration system of KAGRA 2.Beam position monitor system 3.Resolution test 4.Summary 5.Future work The 3rd KAGRA International Workshop, 5/21-22 2017 2 @Academia Sinica, Taipei
Outline 1.Calibration system of KAGRA 2.Beam position monitor system 3.Resolution test 4.Summary 5.Future work The 3rd KAGRA International Workshop, 5/21-22 2017 3 @Academia Sinica, Taipei
Introduction of KAGRA calibration system KAGRA will start full operation from 2020 so we are developing KAGRA calibration system to use it on time. Pcal beams push test mass by photon pressure, and we use it to give test mass displacement. We control two Pcal beams to hit the test mass on vibrational nodes, without exciting elastic modes of the test mass. Pcal beams push Systematic error of mirror displacement less than 1% Main beam push We have to monitor correct beams position. Test mass The 3rd KAGRA International Workshop, 5/21-22 2017 4 @Academia Sinica, Taipei
Systematic errors of Pcal • Major systematic errors Dependent on • Mirror rotation beam position error • Elastic deformation • Absolute laser power 𝑦 𝑔 = 2 P 𝑔 cos 𝜄 1 + 𝑁 S 𝑔 𝒃 N 𝒄 𝑑 𝐽 • Displacement from rotation Leaser Transfer Geometric 1.075 power function factor 1.050 displacement ratio 1.025 1% a 1 1.000 1+abM/I Pcal ⃗ = 10,0 , 𝑑𝑝𝑜𝑒𝑗𝑢𝑗𝑝𝑜: 𝑐 Main 0.975 beam M = 23kg, beam 0.950 θ a I =moment of inertia 0.925 b ~6 𝑏 (mm) It is important to identify both main and Pcal a 2 Pcal beam positions, so we need to develop beam beam position monitoring system. 𝑏 ⃗ = (𝑏 ⃗ 1 + 𝑏 ⃗ 2 )/2 Test mass The 3rd KAGRA International Workshop, 5/21-22 2017 5 @Academia Sinica, Taipei
Outline 1.Calibration system of KAGRA 2.Beam position monitor system 3.Resolution test 4.Summary 5.Future work The 3rd KAGRA International Workshop, 5/21-22 2017 6 @Academia Sinica, Taipei
Beam position monitor system Pcal Laser module Camera window Pcal beams module Pcal beam 72 ° 〜 〜 Main beam mirror Camera image Pcal receiver Test mass module To center To Y-end The 3rd KAGRA International Workshop, 5/21-22 2017 7 @Academia Sinica, Taipei
by remote 127mm Test Mass →to focus on (to observe 1047 nm) →Removed IR filter Optical system of camera module l Telescope : Sky-Watcher BK MAK127 Maksutov‒Cassegrain • Maksutov‒Cassegrain telescope • Focal Length 1500mm • Optical Diameter l Camera : Nikon D810 secondary mirror primary mirror l Remote focuser The 3rd KAGRA International Workshop, 5/21-22 2017 8 @Academia Sinica, Taipei
Outline 1.Calibration system of KAGRA 2.Beam position monitor system 3.Resolution test 4.Summary 5.Future work The 3rd KAGRA International Workshop, 5/21-22 2017 9 @Academia Sinica, Taipei
Demonstration experiment Purpose to check 1. system performance and resolution with mirror 2. aberrations caused by the window Resolution test of this experiment in the condition with mirror and optical window. Requirement resolution ~0.3mm. (3mm/10) 10
Parts used in this experiment 275mm target window 275mm mirror X-end layout 203mm 130mm 80mm 100mm Length=36m target 〜 〜 72° Remote focuser camera telescope window mirror The 3rd KAGRA International Workshop, 5/21-22 2017 11 @Academia Sinica, Taipei
Photos of this experiment Target Camera window 36m 72° At KEK Mirror The 3rd KAGRA International Workshop, 5/21-22 2017 12 @Academia Sinica, Taipei
Result of this experiment 24mm 275mm 275mm 24mm • Size of target frame / number of pixel ~ 0.1(mm/pixel) • The line width in the target sticker is about 0.1mm and we confirmed that this camera system has about 0.1mm resolution without large aberration. This is sufficient resolution as KAGRA Pcal beam monitor system. It is sufficient. We install it on site. 13
installation work Installation schedule Y-end → April done X-end → Jun The 3rd KAGRA International Workshop, 5/21-22 2017 14 @Academia Sinica, Taipei
Outline 1.Calibration system of KAGRA 2.Beam position monitor system 3.Resolution test 4.Summary 5.Future work The 3rd KAGRA International Workshop, 5/21-22 2017 15 @Academia Sinica, Taipei
Summary We finished • demonstration experiment of camera, window and mirrors. • installing camera module for Y-end The 3rd KAGRA International Workshop, 5/21-22 2017 16 @Academia Sinica, Taipei
Outline 1.Calibration system of KAGRA 2.Beam position monitor system 3.Resolution test 4.Summary 5.Future work The 3rd KAGRA International Workshop, 5/21-22 2017 17 @Academia Sinica, Taipei
Future work Work still to be done: • Install camera module to X-end in Jun. • Start operation camera system in July. The 3rd KAGRA International Workshop, 5/21-22 2017 18 @Academia Sinica, Taipei
Thank you so much for your kind attention. The 3rd KAGRA International Workshop, 5/21-22 2017 19 @Academia Sinica, Taipei
Appendix The 3rd KAGRA International Workshop, 5/21-22 2017 20 @Academia Sinica, Taipei
The 3rd KAGRA International Workshop, 5/21-22 2017 21 @Academia Sinica, Taipei
Explanation of project To reduce systematic error and elastic deformation • →we check correct beam position on test mass by camera module. • ↓ • design camera module and around • demonstrate this camera module transmission • ↓ • analyze pictures • ↓ • install this system for KAGRA site The 3rd KAGRA International Workshop, 5/21-22 2017 22 @Academia Sinica, Taipei
Purpose of experiment To check correct beam position on test mass →camera + telescope (telecamera) To take photographs about beam position on Camera module. （We can check position of cooling test mass too. ） The 3rd KAGRA International Workshop, 5/21-22 2017 23 @Academia Sinica, Taipei
The 3rd KAGRA International Workshop, 5/21-22 2017 24 @Academia Sinica, Taipei
Recommend
More recommend
