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Revision 1 as of 2021-04-08 15:40:14
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Editor: YoichiAso
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Editor: mie.ueda
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== Interferometer related ==
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== Vibration isolation related ==
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== Cryogenic related == == CRY (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 the sapphire mirror at low temperature
 * Development of non-contact temperature measurement method of mirror

== PEM (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)related ==
=== 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


== CAL (Calibration) related ==
=== DAC/CAL (Software) ===
 * 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

== DMG (Data Management) related ==
 * Operation of DMG
 * Development of data sharing way between low and high latency data
 * development of data base
 * GRID computing

== IOO (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

== AOS (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

=== TMS (Transmission monitor system) ===
 * Characterization of the vibration-isolation stages TMS
 * Characterization of the optical setup of TMS

== MIF (Main Interferometer) related ==
 * 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

== DGS (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

== DetChar (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)

== AWL (Analogue Electronics) ==
== FCL (Facility) ==
== VAC (Vaccum) ==

Possible research topics for graduate students and postdocs

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 the sapphire mirror at low temperature
  • Development of non-contact temperature measurement method of mirror

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

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

DAC/CAL (Software)

  • 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

  • Operation of DMG
  • Development of data sharing way between low and high latency data
  • development of data base
  • GRID computing

  • 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

Evaluation and Introduction of High Power Laser

  • Debug
  • Reduction of intensity noise
  • Built of EPICS control

New Technology Development

  • Control by EPICS Learning

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

TMS (Transmission monitor system)

  • Characterization of the vibration-isolation stages TMS
  • Characterization of the optical setup of TMS

  • 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

DGS (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

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

  • Background noise of GIF and its improvement
  • Stable operation of KAGRA using strainmeter/seismometer data

  • 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)

AWL (Analogue Electronics)

FCL (Facility)

VAC (Vaccum)

KAGRA/KSC/EducationTraining/ResearchTopics (last edited 2021-04-12 23:25:37 by terrence.tsang)