Differences between revisions 44 and 45
⇤ ← Revision 44 as of 2019-11-13 16:01:07 →
Size: 4401
Editor: fabian.arellano
Comment:
← Revision 45 as of 2019-11-13 16:07:25 → ⇥
Size: 4600
Editor: fabian.arellano
Comment:
Deletions are marked like this. Additions are marked like this.
Line 62: Line 62:
 * Observations:  * '''Observations:''' After pump down it was not possible to move the keystone to zero using the fishing rod. It went as high as -750 µm at the time ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8135|8135]]).
Line 69: Line 69:
 * Observations:This fishing rod of not working at all ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8135|8135]]). It's a real shame because it had a large range of 4 mm total.  * '''Observations:'''This fishing rod of not working at all ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8135|8135]]). It's a real shame because it had a large range of 4 mm total.
Line 76: Line 76:
 * '''Observations:''' After pump down I was not able to move the keystone to zero using the fishing rod. It went as high as -265 µm at that time [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8658|8658]].  * '''Observations:''' After pump down it was not possible to move the keystone to zero using the fishing rod. It went as high as -265 µm at the time [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8658|8658]].

Describe KAGRA/Subgroups/VIS/OpsManual/FishingRods here.

This page describes the status of the fishing rods.

Beam splitter

Top filter

  • Range:

    • LVDT: [ -2500 , +4900 ] µm (7694).

    • Stepper motor: [ -1,400,000 , +1,400,000 ] steps (7694).

    • Temperature when measured:

  • Observations:

    • At 25 ºC it was possible to use the fishing rod to set the keystone at nominal position (8125).

    • at 24.5 ºC or colder it was not (8645, 11465).

Standard Filter

  • Range:

    • LVDT: [ -700 , +700 ] µm (3558).

    • Stepper motor: [ -870,000 to +835,000 ] steps (3558).

    • Temperature when measured:

  • Observations:

    • It's been at its lowest position since the temperature was 25 ºC (8125, 8645).

    • We set the keystone to 488 µm and couldn't move it further down (8125, 8645).

Bottom filter

  • Range:

    • LVDT: [ -1000 µm , +1800 ] µm (3280).

    • Stepper motor: [ -746,000 , +746,000 ] steps (3280).

    • Temperature when measured:

  • Observations: this fishing rod doesn't seem to have any problems, but we haven't used it at every temperature condition we've had.

SR2

Top filter

  • Range:

    • LVDT: [ -990 , 903 ] µm (8082).

    • Stepper motor: [ -1,700,000 , 1,500,000 ] steps (8082).

    • Temperature when measured:
  • Observations:

Stardard filter

  • Range:

    • LVDT: [ -750 , 1000 ] µm (4431).

    • Stepper motor: [ 300,000 , 1,000,00 ] steps (4431).

    • Temperature when measured:
  • Observations:

Bottom filter

  • Range:

    • LVDT: [ -500 , 600 ] µm (4430).

    • Stepper motor: [ -550,000 , -250,000 ] steps (4430).

    • Temperature when measured:
  • Observations:

8082

SR3

Top filter

  • Range:

    • LVDT: [ 885 , -1299 ] µm (7758).

    • Stepper motor: [ -500,000 , 1,100,000 ] steps (7758).

    • Temperature when measured:

  • Observations: After pump down it was not possible to move the keystone to zero using the fishing rod. It went as high as -750 µm at the time (8135).

Standard Flter

  • Range:

    • LVDT: [ -2000 , 2000 ] µm (4720).

    • Stepper motor: [ -700,000 , 1,100,000 ] steps (4720).

    • Temperature when measured:

  • Observations:This fishing rod of not working at all (8135). It's a real shame because it had a large range of 4 mm total.

Bottom Filter

  • Range:

    • LVDT: [ -1600 , +1000 ] µm (4654).

    • Stepper motor: (4654).

    • Temperature when measured:

  • Observations: After pump down it was not possible to move the keystone to zero using the fishing rod. It went as high as -265 µm at the time 8658.

SRM

Top Filter

(7857)

Standard Filter

(4721)

Bottom Filter

(4721)

KAGRA/Subgroups/VIS/OpsManual/FishingRods (last edited 2020-09-18 10:45:40 by fabian.arellano)