• KAGRA
• Subgroups
• VIS
• OpsManual
• FishingRods

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:

Other related entries

8082

SR3

Top filter

• Range:

  • LVDT: [ 885 , -1299 ] µm (7758).

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

  • Temperature when measured:
• Observations:

Standard Flter

• Range:

  • LVDT: [ -2000 , 2000 ] µm (4720).

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

  • Temperature when measured:
• Observations:

Bottom Filter

• Range:

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

  • Stepper motor: (4654).

  • Temperature when measured:

• 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 8658.

Other related entries

• 8658, 8135.

SRM

Top Filter

(7857)

Standard Filter

(4721)

Bottom Filter

(4721)