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Size: 4515
Comment:
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Size: 4436
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
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| == Schematic (One Arm) == | |
| Line 33: | Line 32: |
| * 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]] |
| Line 38: | Line 37: |
| * AOM and AOM driver (to be determined) | * AOM G&H 3080-125 (80MHz) and AOM driver G&H 1075FM-1 (1W, 5MHz BW). |
Arm Length Stabilization System
- Wiki for ALS (Arm Length Stabilization; Auxiliary Lock System), a.k.a green lock system
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 Tektronix FCA3103
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).
- 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
Documents
Document tree for ALS JGW-E1807769