KAGRA VIS Operations Manual - Optical Levers

Diagonalization procedure

This section is still in construction.

For obvious reason it is convent to follow one single diagonalization procedure for all the optical levers in KAGRA. Unfortunately, there are at least two methods.

Type A

Type B

Type Bp: procedure not documented.

Information

Data

Quadrants

QPD Segment Numbering.png

Default OL2EUL Matrix

The following matrix is appropriate if the OL beam is bounced off the AR side of the optic. Then, positive pitch of the optic (right-handed around transverse, nose-down) gives a high return beam, more light on SEG3 and SEG4, and positive P. Similarly, positive yaw of the optic (right-handed around vertical, nose-left) gives a return beam offset to the left (looking at the QPD), more light on SEG1 and SEG4, and positive Y.

QPD Default OL2EUL matrix.png

Micrometer Function

Horizontal

Vertical

Notes

Points right

Points down

viewed facing QPD

Anticlockwise

Anticlockwise

turn of micrometer knob

Retracts tip

Retracts tip

Larger numbers

Larger numbers

on micrometer scale

Stage moves with tip

Stage moves with body

QPD moves left

QPD moves down

Spot moves to right quadrants

Spot moves to upper quadrants

Simulates -yaw

Simulates +pitch

Mechanical Installation

See D1808528 for the TX stand and D1808529 for the shelf, but note that the screw lists are missing the attachment screws.

Be sure to get all fasteners from AOL stock.

Stand Installation

Parts

Fasteners

Tools

Procedure

Shelf Installation

Parts

Screws

Tools

Procedure

Viewports

Description below is for one viewport. Two are needed for the OL, and possibly a third for a camera. See E1707303 for instructions in Japanese by Miyo-kun.

Parts

Fasteners

Tools

Procedure

attachment:Viewport Screw Numbering.jpg

KAGRA/Subgroups/VIS/OpsManual/OpLev (last edited 2019-12-08 17:14:35 by fabian.arellano)