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| ----- == Demonstration of the AdvLIGO interferometer technologies == |
------- == To demonstrate AdvLIGO interferometer technologies == |
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| * '''Green laser locking''' | * [=> Link to 40m lock acq][=> Link to AdvLIGO LSC scheme] * '''Green laser locking''' [=> Link to 40m ALS][=> Link to AdvLIGO ALS] |
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| * "Address advantage and disadv. of the tuned/detuned configuration" | * "Clarify advantage and disadv. of the tuned/detuned configuration" |
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| * [=> Link to 40m CDS][=> Link to AdvLIGO CDS] | |
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| ----- | ------- |
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| * Adaptive noise cancellation | * Adaptive noise cancellation [=> Link to 40m ASS] |
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| ----- ----- |
------- = 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] |
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| = Major things to be upgraded = ----- == Interferometer Configuration == |
* Smaller ITMs/ETMs for lower the optical spring frequencies |
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| == CDS (Control and Data System) == | * 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] |
<<TableOfContents: execution failed [Argument "maxdepth" must be an integer value, not "[2]"] (see also the log)>>
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]