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= Arm Length Stabilization System = = Arm Length Stabilization System (Green Lock System) =
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{{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0074/E1707416/001/DSC_0055.JPG}} == Configuration (One Arm) ==
{{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0074/E1707416/001/DSC_0055.JPG|ALS Configuration|width=500}}
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== To Be Determined == == To Do ==
 * optical layout of PR2/SR2 chambers, POP/POS table
 * select AOM and AOM driver
 * fix green fiber specs, including how to do the laying
 * green fiber after EOM/AOM or before EOM/AOM
 * fiber for PLL beat or not
 * where to put frequency offset: PLL or arm length
 * more detailed noisebudget
 * initial alignment planning
 * comm/diff servo topology
 * lock acquisition scheme
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=== Electronics ===
 * Common Mode Servo Board [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3705|JGW-D1503705]] (ready)
 * PLL Board (similar to CMB, ordered to AEL)
 * Phase Frequency Discriminator [[https://dcc.ligo.org/LIGO-D1002476/public|LIGO-D1002476]] (prototype developed at UToyama)
 * Fast version of IQ Demodulator [[https://dcc.ligo.org/LIGO-E1100044/public|LIGO-E1100044]] (ordered to AEL)
 * RF Oscillator for PDH [[https://www.keysight.com/ja/pdx-x201911-pn-N5181B/mxg-x-series-rf-analog-signal-generator-9-khz-to-6-ghz?cc=JP&lc=jpn|Keysight N5181B MXG]] (ready)
 * VCO for PLL [[https://www.keysight.com/ja/pdx-x201773-pn-E8663D/psg-rf-analog-signal-generator-100-khz-to-9-ghz?cc=JP&lc=jpn|Keysight E8663D]] (ready)
 * Frequency counter (optional) [[https://www.keysight.com/ja/pd-1893411-pn-53220A/350-mhz-universal-frequency-counter-timer-12-digits-s-100-ps?cc=JP&lc=jpn|Keysight 53220A]]?

=== Opto-electronics ===
 * Broadband PD for PLL [[https://www.newport.com/p/818-BB-21A|Newport 818-BB-21A]] (1.2 GHz bandwidth)
 * Resonant PD for green PDH [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1280|JGW-D1201280]]
 * AOM and AOM driver (to be determined)
 * EOM: Qubig xxxxxx (ready)
  * modulation frequencies are 32 MHz and 33 MHz [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5626|JGW-T1605626]]
 * QPD for green beam pointing? (Use Oplev QPD?)
 * Picomotor mount? (ordered)

=== Optics ===
 * Faraday isolator [[https://www.thorlabs.co.jp/thorproduct.cfm?partnumber=IO-5-532-HP|Thorlabs IO-5-532-HP]] (to be ordered)
 * Periscopes [[https://www.thorlabs.com/navigation.cfm?guide_id=54|Thorlabs Ø1.5inch Post Assembly]] (ready)
 * Dichroic mirror: LEO DRX-1064/532-45P-UF-2038 (ready)
 * Harmonic splitter: LEO LWP-45-R532-T1064-UF-2038 (ready)

=== Fiber optics ===
 * Fiber (under test at UToyama)
  * probably with jacket, with endcap, without AR coating
  * polarization maintaining
 * Fiber collimator (Tholabs PAF? Fixed focus collimator?)

== Drawings ==
 * PSL table [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6335|JGW-D1706335]], [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7060|JGW-G1707060]]
 * Fiber layout [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7060|JGW-G1707060]]
 * POP table
 * PR2 in-vac [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6473|JGW-G1706473]]
 * TRX
 * POS table
 * SR2 in-vac
 * TRY
=== Conceptual ===
 * ALS configuration [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5353|JGW-T1605353]] (see Candidate4)
 * Optical layout around PRs [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5261|JGW-T1605261]]
 * Optical layout around SRs [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5967|JGW-T1605967]]

== Noisebudget ==
 * [[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/GreenLock]]
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 * Document tree for ALS [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7769|JGW-E1807769]]

Arm Length Stabilization System (Green Lock System)

Configuration (One Arm)

ALS Configuration

To Do

  • optical layout of PR2/SR2 chambers, POP/POS table
  • select AOM and AOM driver
  • fix green fiber specs, including how to do the laying
  • green fiber after EOM/AOM or before EOM/AOM
  • fiber for PLL beat or not
  • where to put frequency offset: PLL or arm length
  • more detailed noisebudget
  • initial alignment planning
  • comm/diff servo topology
  • lock acquisition scheme

List of Items

Electronics

Opto-electronics

  • Broadband PD for PLL Newport 818-BB-21A (1.2 GHz bandwidth)

  • Resonant PD for green PDH JGW-D1201280

  • AOM and AOM driver (to be determined)
  • EOM: Qubig xxxxxx (ready)
  • QPD for green beam pointing? (Use Oplev QPD?)
  • Picomotor mount? (ordered)

Optics

Fiber optics

  • Fiber (under test at UToyama)
    • probably with jacket, with endcap, without AR coating
    • polarization maintaining
  • Fiber collimator (Tholabs PAF? Fixed focus collimator?)

Drawings

Conceptual

Noisebudget

Documents

KAGRA/Subgroups/IOO/ALS (last edited 2022-05-09 20:33:42 by miyoki)