Differences between revisions 12 and 42 (spanning 30 versions)
⇤ ← Revision 12 as of 2018-02-02 16:27:16 →
Size: 3082
Editor: YutaMichimura
Comment:
← Revision 42 as of 2022-05-09 20:33:42 → ⇥
Size: 5069
Editor: miyoki
Comment:
Deletions are marked like this. Additions are marked like this.
Line 1: Line 1:
= Arm Length Stabilization System (Green Lock System) = = Arm Length Stabilization System =
 Wiki for ALS (Arm Length Stabilization; Auxiliary Lock System), a.k.a green lock system
Line 3: Line 4:
== Configuration (One Arm) ==
{{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0074/E1707416/001/DSC_0055.JPG|ALS Configuration|width=500}}		 {{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0077/T1807771/003/ALSSchematic.png|ALS Configuration|width=500}}
 [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7771|JGW-T1807771]]
Line 9: Line 10:
  * DONE
Line 10: Line 12:
 * fiber collimators for green
Line 11: Line 14:
  * Not much difference from noise, cable length point of view.
  * Alignment jitter noise from AOM will be less if fiber comes after AOM. So, let it so.
 * fiber for PLL beat or not
  * DECIDED not to use fiber for PLL (Mar 5, 2018)
Line 15: Line 22:
  * necessity of summing node for common mode servo ([[https://dcc.ligo.org/LIGO-D1300782/public|LIGO-D1300782]])
   * first, try with digital switch and decide (Feb 6, 2018)
Line 24: Line 33:
  * FM option N5181BU-UNT (not yet ordered)
Line 25: Line 35:
 * 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]]?  * Frequency counter [[https://www.tek.com/frequency-counter/fca3000-3100|Tektronix FCA3103]] (ready)
 * [[Current driver for the thermal path ALS-X/Y servo]]
Line 30: Line 41:
 * AOM and AOM driver (to be determined)
 * EOM: Qubig xxxxxx (ready)		  * AOM G&H 3080-125 (80MHz) and AOM driver G&H 1075FM-1 (1W, 5MHz BW). (ordered)
 * EOM: Qubig EO-T38M3-VIS (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]]
Line 36: Line 48:
 * Faraday isolator [[https://www.thorlabs.co.jp/thorproduct.cfm?partnumber=IO-5-532-HP|Thorlabs IO-5-532-HP]] (to be ordered)  * Faraday isolator [[https://www.thorlabs.co.jp/thorproduct.cfm?partnumber=IO-5-532-HP|Thorlabs IO-5-532-HP]] (ready)
Line 38: Line 50:
 * Dichroic mirror: LEO DRX-1064/532-45P-UF-2038 (ready)
 * Harmonic splitter: LEO LWP-45-R532-T1064-UF-2038 (ready)		  * Dichroic mirror for periscopes: LEO DRX-1064/532-45P-UF-2038 (ready: 8pcs(2 each for POP/POS/TRX/TRY))
 * Harmonic splitter: LEO LWP-45-R532-T1064-UF-2038 (ready: 8pcs(1 each for POP/POS/TRX/TRY, 4 spares))
 * Dichroic mirror in-vac: Sigma TFVMQ-50.8C10-20-W1D-532/1064-ARS-30-45D (ready: 4pcs(1 for PR2, 1 for SR2, 2 spares))
Line 42: Line 55:
 * Fiber (under test at UToyama)  * Fiber: Coastal Connections P-FAnskFAnsk-3.5nx/125/3-75 and -80 (under test at UToyama)
Line 45: Line 58:
 * Fiber collimator (Tholabs PAF? Fixed focus collimator?)  * Fiber collimator ([[https://www.thorlabs.co.jp/newgrouppage9.cfm?objectgroup_id=2940|Thorlabs PAF-X-5-A]]? [[https://www.thorlabs.co.jp/newgrouppage9.cfm?objectgroup_id=5124|Thorlabs triplet lens collimator TC06APC-543]]?)
Line 48: Line 61:
 * PSL table [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6335|JGW-D1706335]]  * 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]]
Line 55: Line 69:
=== 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]]
 * Green beam positions [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7775|JGW-T1807775]]

Arm Length Stabilization System

  • Wiki for ALS (Arm Length Stabilization; Auxiliary Lock System), a.k.a green lock system

ALS Configuration

To Do

  • optical layout of PR2/SR2 chambers, POP/POS table
  • select AOM and AOM driver
    • DONE
  • fix green fiber specs, including how to do the laying
  • fiber collimators for green
  • green fiber after EOM/AOM or before EOM/AOM
    • Not much difference from noise, cable length point of view.
    • Alignment jitter noise from AOM will be less if fiber comes after AOM. So, let it so.
  • fiber for PLL beat or not
    • DECIDED not to use fiber for PLL (Mar 5, 2018)
  • where to put frequency offset: PLL or arm length
  • more detailed noisebudget
  • initial alignment planning
  • comm/diff servo topology

    • necessity of summing node for common mode servo (LIGO-D1300782)

      • first, try with digital switch and decide (Feb 6, 2018)
  • 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 G&H 3080-125 (80MHz) and AOM driver G&H 1075FM-1 (1W, 5MHz BW). (ordered)

  • EOM: Qubig EO-T38M3-VIS (ready)

  • QPD for green beam pointing? (Use Oplev QPD?)
  • Picomotor mount? (ordered)

Optics

  • Faraday isolator Thorlabs IO-5-532-HP (ready)

  • Periscopes Thorlabs Ø1.5inch Post Assembly (ready)

  • Dichroic mirror for periscopes: LEO DRX-1064/532-45P-UF-2038 (ready: 8pcs(2 each for POP/POS/TRX/TRY))
  • Harmonic splitter: LEO LWP-45-R532-T1064-UF-2038 (ready: 8pcs(1 each for POP/POS/TRX/TRY, 4 spares))
  • Dichroic mirror in-vac: Sigma TFVMQ-50.8C10-20-W1D-532/1064-ARS-30-45D (ready: 4pcs(1 for PR2, 1 for SR2, 2 spares))

Fiber optics

Drawings

Conceptual

Noisebudget

Documents

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