Bea eam pos osition on mon onitor or system em of of KA KAGR - - PowerPoint PPT Presentation

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Bea eam pos osition on mon onitor or system em of of KA KAGR - - PowerPoint PPT Presentation

Oct 30, 2022 210 likes •474 views

Bea eam pos osition on mon onitor or system em of of KA KAGR GRA Phot oton on Calibrator or Takaharu Shishido The Graduate University for Advanced Studies on the behalf of KAGRA cal group The 3rd KAGRA

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Bea eam pos

  • sition
  • n mon
  • nitor
  • r system

em of

  • f

KA KAGR GRA Phot

  • ton
  • n Calibrator
  • r

宍戸高治 Takaharu Shishido （The Graduate University for Advanced Studies ）

  • n the behalf of KAGRA cal group

The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 1

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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 @Academia Sinica, Taipei 2

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SLIDE 3

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 @Academia Sinica, Taipei 3

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 4

Introduction of KAGRA calibration system

Systematic error of mirror displacement less than 1% 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

  • n vibrational nodes, without exciting elastic

modes of the test mass.

Main beam Pcal beams Test mass push push

We have to monitor correct beams position.

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SLIDE 5

The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 5

Systematic errors of Pcal

  • Major systematic errors
  • Displacement from rotation

𝑑𝑝𝑜𝑒𝑗𝑢𝑗𝑝𝑜: 𝑐 ⃗ = 10,0 , M = 23kg, I =moment of inertia

  • Mirror rotation
  • Elastic deformation
  • Absolute laser power

Dependent on beam position error

displacement ratio 1+abM/I

a1 a2 a b

θ

Pcal beam Pcal beam Main beam 𝑏 ⃗ = (𝑏 ⃗1 + 𝑏 ⃗2)/2 Test mass

𝑦 𝑔 = 2 P 𝑔 cos 𝜄 𝑑 S 𝑔 1 + 𝑁 𝐽 𝒃 N 𝒄

Geometric factor Leaser power Transfer function

It is important to identify both main and Pcal beam positions, so we need to develop beam position monitoring system.

𝑏 (mm)

1.025 1.000 1.050 1.075 0.975 0.950 0.925

1% ~6

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SLIDE 6

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 @Academia Sinica, Taipei 6

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SLIDE 7

The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 7

Beam position monitor system

Test mass

〜 〜

Camera module To Y-end Camera image mirror To center

Main beam Pcal beams

Pcal beam

72°

window Pcal Laser module Pcal receiver module

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 8

Optical system of camera module

Maksutov‒Cassegrain secondary mirror primary mirror

lTelescope : Sky-Watcher BK MAK127

  • Maksutov‒Cassegrain telescope
  • Focal Length 1500mm
  • Optical Diameter

127mm lCamera : Nikon D810 →Removed IR filter (to observe 1047 nm) lRemote focuser →to focus on Test Mass by remote

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SLIDE 9

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 @Academia Sinica, Taipei 9

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10

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)

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 11

Parts used in this experiment

camera target window mirror Length=36m telescope Remote focuser

〜 〜

72°

X-end layout

window mirror target 100mm 80mm 130mm 203mm 275mm 275mm

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Photos of this experiment

The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 12

At KEK 36m 72° Mirror Target window Camera

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Result of this experiment

13

  • 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.

275mm 275mm 24mm 24mm

It is sufficient. We install it on site.

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SLIDE 14

The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 14

installation work

Installation schedule

Y-end → April done X-end → Jun

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SLIDE 15

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 @Academia Sinica, Taipei 15

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 16

Summary

We finished

  • demonstration experiment of camera,

window and mirrors.

  • installing camera module for Y-end
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SLIDE 17

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 @Academia Sinica, Taipei 17

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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 @Academia Sinica, Taipei 18

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 19

Thank you so much for your kind attention.

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 20

Appendix

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 21

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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 @Academia Sinica, Taipei 22

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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 @Academia Sinica, Taipei 23

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The 3rd KAGRA International Workshop, 5/21-22 2017 @Academia Sinica, Taipei 24