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

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. Preparation to bKAGRA 3. Installation status

1. Configuration in bKAGRA

Configuration of vibration isolation system Type-A: for cryogenic mirrors Type-A Type-B: for room temperature mirrors Type-Bp: simpler Type-B Type-C: for small optics Type-B Type-Bp Type-C

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

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

2. Preparation to bKAGRA

Installtion for bKAGRA Type-A: EYV→EXV Type-B: BS→SR3→SR2 Type-A Type-Bp: PR3→PRM→PR2 x4 Type-B Type-Bp x4 x3

Preparation Status Stack Type-C Top Inverted Standard Bottom Payload SUS Filter Pendulum Filter Filter Need 4 5 8 8 19 11 7 Existing 4 5 1) 8 4) 8 4) 19 9 2) 2 3) To be 0 0 0 0 0 2 5 built 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.

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 .

3. Installation status

Installation Schedule for bKAGRA phase1 (2017-2018)

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

Work log in Y-end (2017)

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

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

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

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. Assemble the TM and the RM with cabling. Slide the RM into the TM.

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

Installation of Type-Bp (PR3) BF damper as new item. LVDT-actuator unit Test assembly of the BF damper. Test hanging was completed.

The installation of Type-A system in Y-end (EYV), Type-B system in BS, and Type-Bp system in PR3 is still on going now.