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Purpose of the upgrade
To demonstrate AdvLIGO interferometer technologies
►Prototyping of AdvLIGO LSC
Lock acquisition
- "Prove AdvLIGO LSC actually works"
[=> Link to 40m lock acq][=> Link to AdvLIGO LSC scheme]
Green laser locking [=> Link to 40m ALS][=> Link to AdvLIGO ALS]
- "Realize lock of the arms independently from the main beam"
"Achieve semi-deterministic lock & smooth handing off"
Noise mechanisms / DC readout
- "Discover and/or confirm by a model RSE specific noise couplings"
►Tuned / Detuned RSE comparison
- "Clarify advantage and disadv. of the tuned/detuned configuration"
- "Demonstrate smooth transition"
►RGC based digital control system
- "Demonstrate complicated LSC code on the connected multiple systems"
- "Establish rapid prototyping methods with simulated plants on the processors"
[=> Link to 40m CDS][=> Link to AdvLIGO CDS]
To do anything useful to make the AdvLIGO easier / faster
►DC&Dither technologies
- Offset lock and handoffs
- AF WFS technique
- "Develop and characterize various new useful techniques"
►Interferometer Diagnosis
- Cavity characterization using aux. laser injection
- "Provide a method of precise in-situ characterization of the interferometer"
►Development / test bench of advanced technologies
- GigE CCD WFS technique
Adaptive noise cancellation [=> Link to 40m ASS]
- "Demonstrate how it works"
- "Understand and improve its limitations"
Major things to be upgraded
►Interferometer design
- AdvLIGO like optical configuration / sensing scheme
- Arm finesse of about 450
2 Phase modulations (11MHz & 55MHz), no Mach Zehndar
Longer PRC/SRC => Use of Folding mirror
- PR gain decided for carrier, SR gain decided by sensitivity
Small asymmetry, extraction of f2 by a undercoupled SEC => good through put of f2 to the dark port
- Use of third harmonic demodulation scheme
- Links to [Optical Configuration][Power Budget][Optical Layout][PRC/SRC design][Sensing scheme][Lock Acquisition scheme]
- Smaller ITMs/ETMs for lower the optical spring frequencies
- Tuned or detuned?
- Tuned / offset detuning What should be compared?
=== ►Green laser locking ==
- Arm length stabilization using auxiliary 532nm lasers at the end of each arm.
- Dichroic coating (1064nm/532nm) for ITMs and ETMs
- Link to [Green locking]
►CDS (Control and Data System)
- AdvLIGO style digital control system utilizing Matlab/Simulink (Realtime Code Generator)
- Realtime code development with "virtual interferometer"
- First test for Realtime code development with "virtual interferometer"
- Links to [CDS upgrade]
►Mechanics
- Use of Tip-Tilt suspenions which is similar to one for ELIGO and AdvLIGO
- Use of Small Optics Suspensions for ITMs/ETMs.
- Links to [Suspension upgrade]
►Electronics
- Upgrade of the RF detection systems
- PDs/demodulators/RF distributors
- Use of a multiple resonant EOM
- Links to [Electronics upgrade]