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Describe KAGRA/Subgroups/VIS/OpsManual/FishingRods here. This page describes the status of the fishing rods and provides characterization information measured at the time of assembly.
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This page describes the status of the fishing rods. It's important to bear in mind that the reported range of the stepper motor in number of steps is not expected to be accurate and it's useful only as a guideline:

 * Whenever the stepper driver is reset the posion of the motor (measured in number of steps from a zero) is lost and begins counting from zero wherever its physical position is.
 * Inaccuracies may arise when a stepper motor reaches the physical end of range because the driver still considers valid the requested position even when its beyond the physcal limit.

With respecto to the LVDT range limits, those may change with temperature.
||'''Suspension''' ||'''Stage''' ||'''Available''' ||'''Polarity (+steps)''' ||'''Range''' ||'''Others''' ||
||<style="text-align:center" |5>ITMX ||F0 ||Stacked[?] ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F1 ||OK [1] ||Up [1] ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F2 ||OK [1] ||Down [1] ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F3 ||NO [1] ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||Stacked[?] ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||<style="text-align:center" |5>ETMX ||F0 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F1 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F2 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F3 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||<style="text-align:center" |5>ITMY ||F0 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F1 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F2 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F3 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||<style="text-align:center" |5>ETMY ||F0 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F1 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F2 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||F3 ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||'''Suspension''' ||'''Stage''' ||'''Available''' ||'''Polarity (+steps)''' ||'''Range''' ||'''Others''' ||
||<style="text-align:center" |3>BS ||F0 ||? ||? ||'''LVDT''' : (-2500,+4900) um [2]<<BR>>'''Stepper''' : (-1.4e6, +1.4e6 ) steps [2] || ||
||F1 ||? ||? ||'''LVDT''' : ( -700 , +700 ) µm [3]<<BR>>'''Stepper''' : ( -870,000 , +835,000 ) steps [3] || ||
||BF ||? ||? ||'''LVDT''' : ( -1000 , +1800 ) µm [4]<<BR>>'''Stepper :''' ( -746,000 , +746,000 ) steps [4] || ||
||<style="text-align:center" |3>SRM ||F0 ||? ||? ||'''LVDT:''' : ( -865 , +626 ) µm [7]<<BR>>'''Stepper''' : ( -1.6e6 , +1.6e6 ) steps [7] || ||
||F1 ||? ||? ||'''LVDT:''' : ( -1700 , +1400 ) µm [8]<<BR>>'''Stepper''' : ( -7e5 , +1.1e6 ) steps [8] || ||
||BF ||? ||? ||'''LVDT:''' : ( -3000 , +2800 ) µm [9]<<BR>>'''Stepper''' : ( -6e5 , +8e5 ) steps [9] || ||
||<style="text-align:center" |3>SR2 ||F0 ||? ||? ||'''LVDT:''' : ( -990 , 903 ) µm [5]<<BR>>'''Stepper''' : ( -1,700,000 , 1,500,000 ) steps [5] || ||
||F1 ||? ||? ||'''LVDT''' : ( -750 , 1000 ) µm [6]<<BR>>'''Stepper''' : ( 300,000 , 1,000,00 ) steps [6] || ||
||BF ||? ||? ||'''LVDT:''' : ( -500 , +600 ) µm [10]<<BR>>'''Stepper''' : [ -5.5e5 , -2.5e5 ] steps [10] || ||
||<style="text-align:center" |3>SR3 ||F0 ||? ||? ||'''LVDT:''' : ( +885 , -1299 ) µm [11]<<BR>>'''Stepper''' : ( -5e5 , +1.1e6 ) steps [11] || ||
||F1 ||? ||? ||'''LVDT:''' : ( -2000 , +2000 ) µm [12]<<BR>>'''Stepper''' : ( -7e5 , +1.1e6 ) steps [12] || ||
||BF ||? ||? ||'''LVDT:''' : ( -1600 , +1000 ) µm [13]<<BR>>'''Stepper''' : ( -2e5 , +2.5e5 ) steps [13] || ||
||'''Suspension''' ||'''Stage''' ||'''Available''' ||'''Polarity (+steps)''' ||'''Range''' ||'''Others''' ||
||<style="text-align:center" |2>PRM ||SF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||<style="text-align:center" |2>PR2 ||SF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||<style="text-align:center" |2>PR3 ||SF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||
||BF ||? ||? ||'''LVDT:''' : ( , ) µm []<<BR>>'''Stepper''' : ( , ) steps [] || ||




References

 * [1] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14820|14820]]
 * [2] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7694|7694]]
 * [3] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3558|3558]]
 * [4] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3280|3280]]
 * [5] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8082|8082]]
 * [6] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4431|4431]]
 * [7] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7857|7857]]
 * [8] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]]
 * [9] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]]
 * [10] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4430|4430]]
 * [11] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7758|7758]]
 * [12] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4720|4720]]
 * [13] [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4654|4654]]
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=
 * [] http://klog.icrr.u-tokyo.ac.jp/osl/?r=

<<TableOfContents>>
Line 7: Line 83:
 * Ragnge
  * LVDT: [ -2500 , +4900 ] µm
  * Stepper motor: [ -1,400,000 , +1,400,000 ] steps
 * '''Range:'''
  * '''LVDT:''' [ -2500 , +4900 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7694|7694]]).
  * '''Stepper motor:''' [ -1,400,000 , +1,400,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7694|7694]]).
Line 11: Line 87:
 * Observations
  * At 25 ºC it's possible to use the fishing rod to set the keystone at nominal position ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8125|8125]]).
  * at 24.5 ºC or lower it's not ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8645|8645]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=11465|11465]]).
 * ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7694|7694]]). What was the temperature that day?
 * '''Observations:'''
  * At 25 ºC it was possible to use the fishing rod to set the keystone at nominal position ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8125|8125]]).
  * at 24.5 ºC or colder it was not ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8645|8645]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=11465|11465]]).
Line 17: Line 92:
 * It's been at its lowest position since the temperature was 25 ºC. We set the keystone to 488 µm and couldn't move it down more ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8125|8125]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8645|8645]]).
 * Range: from -700 µm to +700 µm in the LVDT and from -870,000 to +835,000 steps in the stepper motor ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3358|3558]]). What was the temperature that day?
 * '''Range:'''
  * '''LVDT:''' [ -700 , +700 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7738|7738]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3358|3558]]).
  * '''Stepper motor:''' [ -870,000 to +835,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7738|7738]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3358|3558]]).
  * Temperature when measured:
 * '''Observations:'''
  * It's been at its lowest position since the temperature was 25 ºC ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8125|8125]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8645|8645]]).
  * We set the keystone to 488 µm and couldn't move it further down ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8125|8125]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8645|8645]]).
Line 21: Line 101:
 * This fishing rod didn't seem to have any problems before but we haven't tried to use it at every temperature condition we've had.
 * Range:''' '''from''' '''-1000 µm to +1800 µm in the LVDT and from -746,000 to +746,000 steps in the stepper motor ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3280|3280]]).What was the temperature that day?
 * '''Range:'''
  * '''LVDT:''' [ -1000 µm , +1800 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3280|3280]]).
  * '''Stepper motor:''' [ -746,000 , +746,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3280|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.
Line 26: Line 109:
Range: ''' [ -1,700,000 , 1,500,000 ]'''  * '''Range:'''
  * '''LVDT:''' [ -990 , 903 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8082|8082]]).
  * '''Stepper motor:''' [ -1,700,000 , 1,500,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8082|8082]]).
  * Temperature when measured:
 * '''Observations:''' This fishing rod is not known to have problems. See klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13930|13930]].
Line 29: Line 116:
Range: from -750 µm to 1000 µm in the LVDT and from 300,000 to 1,000,00 steps in the stepper motor ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4431|4431]]).  * '''Range:'''
  * '''LVDT:''' [ -750 , 1000 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4431|4431]]).
  * '''Stepper motor:''' [ 300,000 , 1,000,00 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4431|4431]]).
  * Temperature when measured:
 * '''Observations:''' This fishing rod is not known to have problems. See klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13930|13930]].
Line 32: Line 123:
Range: from -500 µm to 600 µm in the LVDT and from -550,000 to -250,000 ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4430|4430]]).  * '''Range:'''
  * '''LVDT:''' [ -500 , 600 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4430|4430]]).
  * '''Stepper motor:''' [ -550,000 , -250,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4430|4430]]).
  * Temperature when measured:
 * '''Observations:''' This fishing rod is not known to have problems.
Line 35: Line 130:
[[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8082|8082]]  * Calculated temperature correction: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8082|8082]].
 * Recovery after pump down: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8160|8160]].
Line 39: Line 135:
([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7758|7758]])  * '''Range:'''
  * '''LVDT:''' [ 885 , -1299 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7758|7758]]).
  * '''Stepper motor:''' [ -500,000 , 1,100,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7758|7758]]).
  * Temperature when measured:
 * '''Observations:''' This fishing rod doesn't seem to have any problems ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8135|8135]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8658|8658]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14890|14890]]) (The previouly reported status was wrong: "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". However, I didn't find any klog reporting a problem with this fishing rod.)
Line 42: Line 142:
([[http://p://klog.icrr.u-tokyo.ac.jp/osl/?r=4720|4720]])  * '''Range:'''
  * '''LVDT:''' [ -2000 , 2000 ]''' '''µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4720|4720]]).
  * '''Stepper motor:''' [ -700,000 , 1,100,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4720|4720]]).
  * Temperature when measured:
 * '''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 45: Line 149:
([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4654|4654]])  * '''Range:'''
  * '''LVDT:''' [ -1600 , +1000 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4654|4654]]).
  * '''Stepper motor:''' [ -200,000 , 250,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4654|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 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8658|8658]].
  * The number of steps for the stepper motor seem relatively small. In principle there's nothing wrong with this but let's point this out.
Line 52: Line 162:
([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7857|7857]])  * '''Range:'''
  * '''LVDT:''' [ -865 , 626 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7857|7857]]).
  * '''Stepper motor:''' [ -1,600,000 , 1,600,00 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7857|7857]]).
  * Temperature when measured:
 * '''Observations: '''This fishing rod is not known to have problems.
Line 55: Line 169:
([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]])  * '''Range:'''
  * '''LVDT:''' [ -1,700 , 1,400 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]]) .
  * '''Stepper motor:''' [ -700,000 , 1,100,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]]) .
  * Temperature when measured:
 * '''Observations: '''This fishing rod is not known to have problems.
Line 58: Line 176:
([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]])  * '''Range:'''
  * '''LVDT:''' [ -3,000 , 2,800 ] µm ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]]).
  * '''Stepper motor:''' [ -600,000 , 800,000 ] steps ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4721|4721]]).
  * Temperature when measured:
 * '''Observations: '''This fishing rod is not known to have problems.

Related entries

Recovery after pump down: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8197|8197]].

This page describes the status of the fishing rods and provides characterization information measured at the time of assembly.

It's important to bear in mind that the reported range of the stepper motor in number of steps is not expected to be accurate and it's useful only as a guideline:

  • Whenever the stepper driver is reset the posion of the motor (measured in number of steps from a zero) is lost and begins counting from zero wherever its physical position is.
  • Inaccuracies may arise when a stepper motor reaches the physical end of range because the driver still considers valid the requested position even when its beyond the physcal limit.

With respecto to the LVDT range limits, those may change with temperature.

Suspension

Stage

Available

Polarity (+steps)

Range

Others

ITMX

F0

Stacked[?]

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F1

OK [1]

Up [1]

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F2

OK [1]

Down [1]

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F3

NO [1]

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

Stacked[?]

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

ETMX

F0

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F1

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F2

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F3

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

ITMY

F0

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F1

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F2

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F3

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

ETMY

F0

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F1

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F2

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

F3

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

Suspension

Stage

Available

Polarity (+steps)

Range

Others

BS

F0

?

?

LVDT : (-2500,+4900) um [2]
Stepper : (-1.4e6, +1.4e6 ) steps [2]

F1

?

?

LVDT : ( -700 , +700 ) µm [3]
Stepper : ( -870,000 , +835,000 ) steps [3]

BF

?

?

LVDT : ( -1000 , +1800 ) µm [4]
Stepper : ( -746,000 , +746,000 ) steps [4]

SRM

F0

?

?

LVDT: : ( -865 , +626 ) µm [7]
Stepper : ( -1.6e6 , +1.6e6 ) steps [7]

F1

?

?

LVDT: : ( -1700 , +1400 ) µm [8]
Stepper : ( -7e5 , +1.1e6 ) steps [8]

BF

?

?

LVDT: : ( -3000 , +2800 ) µm [9]
Stepper : ( -6e5 , +8e5 ) steps [9]

SR2

F0

?

?

LVDT: : ( -990 , 903 ) µm [5]
Stepper : ( -1,700,000 , 1,500,000 ) steps [5]

F1

?

?

LVDT : ( -750 , 1000 ) µm [6]
Stepper : ( 300,000 , 1,000,00 ) steps [6]

BF

?

?

LVDT: : ( -500 , +600 ) µm [10]
Stepper : [ -5.5e5 , -2.5e5 ] steps [10]

SR3

F0

?

?

LVDT: : ( +885 , -1299 ) µm [11]
Stepper : ( -5e5 , +1.1e6 ) steps [11]

F1

?

?

LVDT: : ( -2000 , +2000 ) µm [12]
Stepper : ( -7e5 , +1.1e6 ) steps [12]

BF

?

?

LVDT: : ( -1600 , +1000 ) µm [13]
Stepper : ( -2e5 , +2.5e5 ) steps [13]

Suspension

Stage

Available

Polarity (+steps)

Range

Others

PRM

SF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

PR2

SF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

PR3

SF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

BF

?

?

LVDT: : ( , ) µm []
Stepper : ( , ) steps []

References

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 (7738, 3558).

    • Stepper motor: [ -870,000 to +835,000 ] steps (7738, 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: This fishing rod is not known to have problems. See klog entry 13930.

Stardard filter

  • Range:

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

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

    • Temperature when measured:
  • Observations: This fishing rod is not known to have problems. See klog entry 13930.

Bottom filter

  • Range:

    • LVDT: [ -500 , 600 ] µm (4430).

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

    • Temperature when measured:
  • Observations: This fishing rod is not known to have problems.

  • Calculated temperature correction: 8082.

  • Recovery after pump down: 8160.

SR3

Top filter

  • Range:

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

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

    • Temperature when measured:
  • Observations: This fishing rod doesn't seem to have any problems (8135, 8658, 14890) (The previouly reported status was wrong: "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". However, I didn't find any klog reporting a problem with this fishing rod.)

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: [ -200,000 , 250,000 ] steps (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.

    • The number of steps for the stepper motor seem relatively small. In principle there's nothing wrong with this but let's point this out.

SRM

Top Filter

  • Range:

    • LVDT: [ -865 , 626 ] µm (7857).

    • Stepper motor: [ -1,600,000 , 1,600,00 ] steps (7857).

    • Temperature when measured:
  • Observations: This fishing rod is not known to have problems.

Standard Filter

  • Range:

    • LVDT: [ -1,700 , 1,400 ] µm (4721) .

    • Stepper motor: [ -700,000 , 1,100,000 ] steps (4721) .

    • Temperature when measured:
  • Observations: This fishing rod is not known to have problems.

Bottom Filter

  • Range:

    • LVDT: [ -3,000 , 2,800 ] µm (4721).

    • Stepper motor: [ -600,000 , 800,000 ] steps (4721).

    • Temperature when measured:
  • Observations: This fishing rod is not known to have problems.

Related entries

Recovery after pump down: 8197.

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