Differences between revisions 1 and 26 (spanning 25 versions)

Arm Length Stabilization System

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

Schematic (One Arm)

ALS Configuration

JGW-T1807771

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
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
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
lock acquisition scheme

List of Items

Electronics

Common Mode Servo Board JGW-D1503705 (ready)
PLL Board (similar to CMB, ordered to AEL)
Phase Frequency Discriminator LIGO-D1002476 (prototype developed at UToyama)
Fast version of IQ Demodulator LIGO-E1100044 (ordered to AEL)
RF Oscillator for PDH Keysight N5181B MXG (ready)
VCO for PLL Keysight E8663D (ready)
Frequency counter (optional) Keysight 53220A?

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)
- modulation frequencies are 32 MHz and 33 MHz JGW-T1605626
QPD for green beam pointing? (Use Oplev QPD?)
Picomotor mount? (ordered)

Optics

Faraday isolator Thorlabs IO-5-532-HP (to be ordered)
Periscopes 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 JGW-D1706335, JGW-G1707060
Fiber layout JGW-G1707060
POP table
PR2 in-vac JGW-G1706473
TRX
POS table
SR2 in-vac
TRY

Conceptual

ALS configuration JGW-T1605353 (see Candidate4)
Optical layout around PRs JGW-T1605261
Optical layout around SRs JGW-T1605967
Green beam positions JGW-T1807775

Noisebudget

https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/GreenLock

Documents

Document tree for ALS JGW-E1807769

-  ⇤ ← Revision 1 as of 2018-02-02 15:41:28 → 
  Size: 182
  Editor: YutaMichimura
  Comment:
+   ← Revision 26 as of 2018-02-08 00:25:38 → ⇥
  Size: 4515
  Editor: YutaMichimura
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
+ Wiki for ALS (Arm Length Stabilization; Auxiliary Lock System), a.k.a green lock system
-Line 3:
+Line 4:
-{{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0074/E1707416/001/DSC_0055.JPG}}
+== Schematic (One Arm) ==
{{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0077/T1807771/002/ALSSchematic.png|ALS Configuration|width=500}}
 [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7771|JGW-T1807771]]
-Line 5:
+Line 8:
-== 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
 * 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
 * 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 ([[https://dcc.ligo.org/LIGO-D1300782/public|LIGO-D1300782]])
   * first, try with digital switch and decide
 * lock acquisition scheme
-Line 8:
+Line 26:
+=== 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]]
 * Green beam positions [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7775|JGW-T1807775]]

== Noisebudget ==
 * [[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/GreenLock]]
-Line 10:
+Line 75:
+ * Document tree for ALS [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7769|JGW-E1807769]]