Installation status of vibration isolation system Ryutaro Takahashi - - PowerPoint PPT Presentation

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Feb 24, 2023 158 likes •393 views

Installation status of vibration isolation system Ryutaro Takahashi (National Astronomical Observatory of Japan) The 3rd KAGRA International Workshop Academia Sinica (NTU campus), Taipei, 21-22 May, 2017 Outline 1. Configuration in bKAGRA 2.

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Installation status of vibration isolation system

Ryutaro Takahashi

(National Astronomical Observatory of Japan)

The 3rd KAGRA International Workshop Academia Sinica (NTU campus), Taipei, 21-22 May, 2017

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Outline

1. Configuration in bKAGRA
2. Preparation to bKAGRA
3. Installation status

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1. Configuration in bKAGRA

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Configuration of vibration isolation system

Type-A: for cryogenic mirrors Type-B: for room temperature mirrors Type-Bp: simpler Type-B Type-C: for small optics

Type-B Type-Bp Type-C Type-A

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Type-A Type-B Type-Bp Type-C

Arrangement

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Top Filter (TF) Inverted Pendulum (IP) Standard Filter (SF) Filter1~3 in Type-A Filter1 in Type-B Bottom Filter (BF) Test Mass (TM) Recoil Mass (RM) Pre-isolator (PI) Payload (PAY) Filter chain Intermediate Mass (IM) Intermediate Recoil Mass (IRM)

Seismic Attenuation System (Type-B)

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2. Preparation to bKAGRA

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Installtion for bKAGRA

Type-A: EYV→EXV Type-B: BS→SR3→SR2 Type-Bp: PR3→PRM→PR2

Type-B x4 Type-Bp x3 Type-A x4

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1) Two Type-C suspensions were modified for IMMT. 2) Two bottom filters were assembled for Type-A. 3) PR3 and BS payloads were assembed. 4) Five sets of pre-isolators were assembled.

Stack Type-C SUS Top Filter Inverted Pendulum Standard Filter Bottom Filter Payload

Need 4 5 8 8 19 11 7 Existing 4 51) 84) 84) 19 92) 23) To be built 2 5

Preparation Status

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Assembly of pre-isolators

The inverted pendulum and the top filter were combined to the pre-isolator in NAOJ. Three sets of pre-isolators have been trandported to KAGRA. Transportation of the pre-isolator to the 2nd floor in Y-end .

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3. Installation status

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Installation Schedule for bKAGRA phase1 (2017-2018)

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Pre-isolator Filter1 Filter2 Filter3 Bottom Filter Dummy Payload 10m Cryo-payload 2nd Floor Bore Hole 1st Floor

Installation

f Type-A

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Work log in Y-end (2017)

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Adjust the BF and assemlbe the BF damper. Cabling between the BF and the F3. Mount the Filter3.

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F1 with cables on the frame lock Top plate on the frame lock Pre-isolator on the bridge frame

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BF and DP in the cross tube Dismounted DP Anchor for the EQ stop

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Installation of Type-B (BS)

Test hanging of the beam splitter (dummy) is on going at the KAGRA site from July. Beam splitter is the largest optics in KAGRA (37cm).

Mount the winch system on the IM. Slide the RM into the TM. Assemble the TM and the RM with cabling.

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Mount the pre-isolator. Assemble the IRM and mount the BF with cabling.

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Installation of Type-Bp (PR3)

Test hanging was completed. BF damper as new item. LVDT-actuator unit Test assembly of the BF damper.

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