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| === Underground environment evaluation === * New environmental monitors * Seismometer analysis * Magnetometer analysis * Microphone analysis * Newtonian noise evaluation === Interferometer noise evaluation === * New environmental monitors * Power line monitor, GND survey * Correlation/coherent analysis (Close to commissioning) * Glitch, line noise evaluation (Close to DetChar) * Feedforward, offline noise subtraction * PEM injection test == VIS（Vibration Isolation System）== === Sensor Development=== * Development of new local sensor with high-sensitivity, wide-range and cryogenic use, replaced from OSEM and photo-sensor * Development of new local sensor by using optical comb technology * Development of inertial sensor (seismometer, accelerometer) === Performance Improvement === * Optimization of control, development of active filter * Control of low frequency range by using GIF * Improvement of lower frequency performance of IP * Development of light and easy maintenance GAS filter |
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| === DAC/CAL (Sftware) === * Timing correction * Line-noise subtraction * Optimization of avoidance method of dynamic range problem * Improvement of self-diagnosis of pipe-line * Improvement of interface of pipe-line, filter, injection and so on === Commissioning/CAL (Hardware)=== * PCAL * Higher performance of calibration of integrating sphere (5% -> <1%) * Mitigation of scattered light(in O4) * Stabilization of Pcal laser * Correction of temperature dependence of integrating sphere * Evaluation of integrating sphere like injection angle of laser and opening size (in O5) * Development of Gcal |
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| * Operation of DMG * Development of data sharing way between low and high latency data * development of data base * GRID computing |
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| * R&D of Mach–Zehnder * Angular Sensing Control of Input Mode Cleaner * Redesign of IMMT TRANS breadboard * Intensity noise at IMC * Redesign of PSL optical path * Arrangement of cabling at around PSL and IMC * Improvement of ALS fiber noise canceling (FNC) * Improvement of ALS PLL |
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| === Evaluation and Introduction of High Power Laser=== * Debug * Reduction of intensity noise * Built of EPICS control === New TEchnology Development=== * Control by EPICS Learning |
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| === stray-light mitigation === * Development and/or characterization of light-absorbing materials required for the large-scale interferometers * Stray-light mitigation in the actual KAGRA interferometer with ray-trace software simulation and their actual fabrication * Design, assembly, and evaluation of optical baffles and beam dumps for KAGRA, as well as the installation * Characterization of stray-light noises in KAGRA ===Transmission monitor system(TMS) === * Characterization of the vibration-isolation stages TMS * Characterization of the optical setup of TMS == Main Interferomitor system MIF)== * RSE locking simulation and commissioning * Alignment sensing and controls simulation and commissioning * Laser frequency stabilization * Interferometer characterizations (optical parameters, mode content, birefringence, high power effect, etc.) * Parametric instability modeling and mitigation * Commissioning and upgrade of transmission monitor system (TMS-VIS, optical table cover, polarization monitor) * Output optics development (OMC, beam shutter etc.) * In-vacuum RF PD and RF QPD development * Upgrade of Mach-Zehnder modulator |
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| === Timing synchronization === * Evaluation of accuracy and precision of received GPS (including automation) * Evaluation of accuracy of ADC/DAC synchronization for OMC, ETMX, and ETMY. * Measurement of timing delay ===Other=== * Interferometer diagnosis system |
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| === Glitch noise investigation * Searching auxiliary channels which have many coincidence events with main interferometer signals * Glitch classification from glitch waveform (providing glitch catalogue) * Rejecting fake gravitational wave events by information of glitches on auxiliary channels * h(t) generation and comparison before and after glitch rejection === Narrowband noise (spectral lines) === * Automation of line identification (freq, Q, etc) and constructing line data base * Automation of calibration line removal and evaluation of robustness of removal method. * Know lines (such as reference signal) removal === Computing === * Constructing the system which receives GW alerts from GraceDB * Automation of launching glitch pipelines by using GW alerts * Construction database of known/unknown spectral lines === Others === * Evaluation of background noise of auxiliary channels, especially for environmental sensors * Searching safe channel (which is not affected by GWs) and evaluation coherence between safe channel and h(t) * Software noise removal by using safe channels == GIF（Geophysics Interferometer）== === Subjects on GIF observation data === * Origin of acoustic strain vibrations associated with felt earthquakes * Response of underground strains to rainfall and air pressure * Relations between earthquakes in the fault and strain changes * Relations between volcanic/seismic activities and regional strains === Subjects related to development of instruments=== * Background noise of GIF and its improvement * Stable operation of KAGRA using strainmeter/seismometer data |
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| * Q measurement of coating at cryogenic temperature * absorption measurement of sapphire bulks * absorption measurement of crystalline coatings * birefringence measurement of sapphire bulks * impact of birefringence in IFO (simulation) == Analogue Electronics (AEL)== ==Facility (FCL)== ==Vaccum(VAC)== |
Possible research topics for graduate students and postdocs
Contents
- Possible research topics for graduate students and postdocs
Main Interferometer related
Vibration isolation related
Cryogenics related
Thermal Noise
- Mechanical Q measurement (sapphire fiber, blade spring, bonding, coatings, ...)
- Evaluation of sapphire suspension thermal noise
- Evaluation of thermal noise of integrated cryo-payload
- Design of new sapphire blade spring
- Measurement of violin mode of sapphire suspension fibers and their subtraction from data
Cryogenics
- Development of high-sensitivity local displacement sensor at low temperature
- Development of frosting removal on mirror by using CO2 laser or heater
- Evaluation of low-magnetism black-coating (optical absorption at 1064nm ...)
- Optical absorption measurement of sapphire mirror at low temperature
- Development of non-contact temperature measurement method of mirror
Physical Environment Monitoring related
Underground environment evaluation
- New environmental monitors
- Seismometer analysis
- Magnetometer analysis
- Microphone analysis
- Newtonian noise evaluation
Interferometer noise evaluation
- New environmental monitors
- Power line monitor, GND survey
- Correlation/coherent analysis (Close to commissioning)
Glitch, line noise evaluation (Close to DetChar)
- Feedforward, offline noise subtraction
- PEM injection test
== VIS（Vibration Isolation System）== === Sensor Development===
- Development of new local sensor with high-sensitivity, wide-range and cryogenic use, replaced from OSEM and photo-sensor
- Development of new local sensor by using optical comb technology
- Development of inertial sensor (seismometer, accelerometer)
Performance Improvement
- Optimization of control, development of active filter
- Control of low frequency range by using GIF
- Improvement of lower frequency performance of IP
- Development of light and easy maintenance GAS filter
Calibration related
DAC/CAL (Sftware)
- Timing correction
- Line-noise subtraction
- Optimization of avoidance method of dynamic range problem
- Improvement of self-diagnosis of pipe-line
- Improvement of interface of pipe-line, filter, injection and so on
=== Commissioning/CAL (Hardware)===
- PCAL
Higher performance of calibration of integrating sphere (5% -> <1%)
- Mitigation of scattered light(in O4)
- Stabilization of Pcal laser
- Correction of temperature dependence of integrating sphere
- Evaluation of integrating sphere like injection angle of laser and opening size (in O5)
- Development of Gcal
Data Management related
- Operation of DMG
- Development of data sharing way between low and high latency data
- development of data base
- GRID computing
Input & Output Optics related
R&D of Mach–Zehnder
- Angular Sensing Control of Input Mode Cleaner
- Redesign of IMMT TRANS breadboard
- Intensity noise at IMC
- Redesign of PSL optical path
- Arrangement of cabling at around PSL and IMC
- Improvement of ALS fiber noise canceling (FNC)
- Improvement of ALS PLL
Laser related
=== Evaluation and Introduction of High Power Laser===
- Debug
- Reduction of intensity noise
- Built of EPICS control
=== New TEchnology Development===
- Control by EPICS Learning
Auxiliary Optics related
stray-light mitigation
- Development and/or characterization of light-absorbing materials required for the large-scale interferometers
- Stray-light mitigation in the actual KAGRA interferometer with ray-trace software simulation and their actual fabrication
- Design, assembly, and evaluation of optical baffles and beam dumps for KAGRA, as well as the installation
- Characterization of stray-light noises in KAGRA
===Transmission monitor system(TMS) ===
- Characterization of the vibration-isolation stages TMS
- Characterization of the optical setup of TMS
== Main Interferomitor system MIF)==
- RSE locking simulation and commissioning
- Alignment sensing and controls simulation and commissioning
- Laser frequency stabilization
- Interferometer characterizations (optical parameters, mode content, birefringence, high power effect, etc.)
- Parametric instability modeling and mitigation
- Commissioning and upgrade of transmission monitor system (TMS-VIS, optical table cover, polarization monitor)
- Output optics development (OMC, beam shutter etc.)
- In-vacuum RF PD and RF QPD development
- Upgrade of Mach-Zehnder modulator
Digital System related
Timing synchronization
- Evaluation of accuracy and precision of received GPS (including automation)
- Evaluation of accuracy of ADC/DAC synchronization for OMC, ETMX, and ETMY.
- Measurement of timing delay
===Other===
- Interferometer diagnosis system
Detector Characterization related
=== Glitch noise investigation
- Searching auxiliary channels which have many coincidence events with main interferometer signals
- Glitch classification from glitch waveform (providing glitch catalogue)
- Rejecting fake gravitational wave events by information of glitches on auxiliary channels
- h(t) generation and comparison before and after glitch rejection
Narrowband noise (spectral lines)
- Automation of line identification (freq, Q, etc) and constructing line data base
- Automation of calibration line removal and evaluation of robustness of removal method.
- Know lines (such as reference signal) removal
Computing
- Constructing the system which receives GW alerts from GraceDB
- Automation of launching glitch pipelines by using GW alerts
- Construction database of known/unknown spectral lines
Others
- Evaluation of background noise of auxiliary channels, especially for environmental sensors
- Searching safe channel (which is not affected by GWs) and evaluation coherence between safe channel and h(t)
- Software noise removal by using safe channels
== GIF（Geophysics Interferometer）==
Subjects on GIF observation data
- Origin of acoustic strain vibrations associated with felt earthquakes
- Response of underground strains to rainfall and air pressure
- Relations between earthquakes in the fault and strain changes
- Relations between volcanic/seismic activities and regional strains
=== Subjects related to development of instruments===
- Background noise of GIF and its improvement
- Stable operation of KAGRA using strainmeter/seismometer data
Mirror related
- Q measurement of coating at cryogenic temperature
- absorption measurement of sapphire bulks
- absorption measurement of crystalline coatings
- birefringence measurement of sapphire bulks
- impact of birefringence in IFO (simulation)
== Analogue Electronics (AEL)== ==Facility (FCL)== ==Vaccum(VAC)==