A photo sensor to monitor the motion of the recoil mass

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Presentation transcript:

A photo sensor to monitor the motion of the recoil mass during the suspension assembly Since we do not have OSEM sensors on the mirrors, we do not have any local sensor for the last stage until the suspension system is installed into the chamber, where the length sensing OpLev can be used. This document describe a photo sensor to monitor the recoil mass motion during the assembly work so that we can measure transfer functions to the last stage of the suspension to confirm nothing is touching 2016/11/16 Y. Aso JGW-D1605845

Mechanical Design

Overview of the system clamp photo sensor XYZ stage fixed to the base plate

Purple colored parts need to be manufactured Everything else are off-the-shelf opto-mechanical parts

Installation Procedure 1 Retract the arm move the stage back

Installation Procedure 2 Move the stopper ring

Installation Procedure 3 Move the arm forward

Installation Procedure 4 Repeat the step 2 and 3 many times until the photo sensor head gets roughly 1cm from the recoil mass

Installation Procedure 5 Use the micro-meter to put the sensor head very close to the recoil mass surface

Off the shelf components XYZ stage 駿河精機 B76-60C Photo sensor clamp Thorlabs CH1A Other components from SIGMA Koki PO-20-100 PO-12-100 CCHN-12-12 x 2 CCHN-20-12 RO-12-150 x 2 TR-12 TR-20 SP-109-1

Circuit Design

Original Photo Sensor Driving Topology

We need to make an interface box for KAGRA To ADC (DB9) Analog Out (BNC) +/-18V 3pin DSUB To PS (DB9) signal 18V->5V +5V/GND