Differences between revisions 18 and 36 (spanning 18 versions)

Arm Length Stabilization System

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

ALS Configuration

JGW-T1807771

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

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)
- FM option N5181BU-UNT (not yet ordered)
VCO for PLL Keysight E8663D (ready)
Frequency counter Tektronix FCA3103 (ready)

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 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 (ready)
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)
Dichroic mirror in-vac: Sigma TFVMQ-50.8C10-20-W1D-532/1064-ARS-30-45D (ready)

Fiber optics

Fiber: Coastal Connections P-FAnskFAnsk-3.5nx/125/3-75 and -80 (under test at UToyama)
- probably with jacket, with endcap, without AR coating
- polarization maintaining
Fiber collimator (Tholabs PAF-X-5-A? Thorlabs triplet lens 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 18 as of 2018-02-02 19:24:22 → 
  Size: 3875
  Editor: YutaMichimura
  Comment:
+   ← Revision 36 as of 2018-03-12 12:06:56 → ⇥
  Size: 4792
  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}}
+{{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 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.
-Line 12:
+Line 17:
+  * DECIDED not to use fiber for PLL (Mar 5, 2018)
-Line 16:
+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 25:
+Line 33:
+  * FM option N5181BU-UNT (not yet ordered)
-Line 26:
+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)
-Line 31:
+Line 40:
- * AOM and AOM driver (to be determined)
+ * AOM G&H 3080-125 (80MHz) and AOM driver G&H 1075FM-1 (1W, 5MHz BW). (ordered)
-Line 38:
+Line 47:
- * 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 42:
+Line 51:
+ * Dichroic mirror in-vac: Sigma TFVMQ-50.8C10-20-W1D-532/1064-ARS-30-45D (ready)
-Line 44:
+Line 54:
- * Fiber (under test at UToyama)
+ * Fiber: Coastal Connections P-FAnskFAnsk-3.5nx/125/3-75 and -80 (under test at UToyama)
-Line 47:
+Line 57:
- * Fiber collimator (Tholabs PAF? Fixed focus collimator?)
+ * Fiber collimator (Tholabs PAF-X-5-A? [[https://www.thorlabs.co.jp/newgrouppage9.cfm?objectgroup_id=5124|Thorlabs triplet lens collimator]]?)
-Line 62:
+Line 72:
+ * Green beam positions [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7775|JGW-T1807775]]