|
Size: 2068
Comment:
|
Size: 4031
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| = Arm Length Stabilization System = | = Arm Length Stabilization System (Green Lock System) = |
| Line 7: | Line 7: |
| * 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 * 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 * lock acquisition scheme |
|
| Line 18: | Line 30: |
| === Optics, Opto-electronics === | === Opto-electronics === |
| Line 23: | Line 35: |
| * 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 33: | Line 46: |
| * Fiber | * Fiber (under test at UToyama) * probably with jacket, with endcap, without AR coating * polarization maintaining |
| Line 36: | Line 51: |
| == 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]] == Noisebudget == * [[https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/GreenLock]] |
|
| Line 37: | Line 69: |
| * Document tree for ALS [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7769|JGW-E1807769]] |
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
- 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
- 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
Documents
Document tree for ALS JGW-E1807769