Differences between revisions 12 and 23 (spanning 11 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)
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

Noisebudget

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

Documents

Document tree for ALS JGW-E1807769

-  ⇤ ← Revision 12 as of 2018-02-02 16:27:16 → 
  Size: 3082
  Editor: YutaMichimura
  Comment:
+   ← Revision 23 as of 2018-02-05 21:43:50 → ⇥
  Size: 4346
  Editor: YutaMichimura
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 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}}
+== Schematic (One Arm) ==
{{https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0077/T1807771/001/ALSSchematic.png|ALS Configuration|width=500}}
 [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7771|JGW-T1807771]]
-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
-Line 15:
+Line 21:
+  * necessity of summing node for common mode servo ([[https://dcc.ligo.org/LIGO-D1300782/public|LIGO-D1300782]])
-Line 32:
+Line 39:
+  * 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 48:
+Line 56:
- * 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 64:
+=== 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]]