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| === Conceptual === * ALS configuration [[JGW-T1605353|https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5353]] (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]] |
Arm Length Stabilization System (Green Lock System)
Configuration (One Arm)
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
- 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
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
- POP table
PR2 in-vac 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 (see Candidate4)
Optical layout around PRs JGW-T1605261
Optical layout around SRs JGW-T1605967
Noisebudget
Documents
Document tree for ALS JGW-E1807769