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 * RF noise measurement around RF sideband frequency.
  * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/MIFIOOInterfaces|RF sideband frequency list]]

PEM injection in bKAGRA phase1

(Description will be translated to English at some point)

Aims

bKAGRA phase1 における、

  • 干渉計感度への環境雑音の影響のプロジェクション
  • 散乱光のキャラクタリゼーション
  • 雑音の形態学的スタディ

Injection types

  • Acoustic injection (AcI)
  • Magnetic injection (MaI)
  • Shaking injection (ShI)

What we want to do

Necessary

  • Measuring coupling functions between environmental noise and interferometer signal
  • Measuring environmental noise using several sensors
  • Spectrogram of the interferometer signal during injection

If possible

  • Narrow down coupling locations
  • Narrow down environmental noise source locations
  • Switch off test
  • Identify line noise sources
  • RF noise measurement around RF sideband frequency.

Candidates of measurement points

  • PSL
  • IMC (mirrors, refl table)
  • IFI
  • PRM
  • BS
  • ETMX/Y (1F,2F)
  • WAB
  • Arms

(including racks of each points for control and DAQ.)

Schedule

(VERY ROUGH)

  • Before bKAGRA phase1 run (Detailed date has not been fixed): Preparation
  • After bKAGRA phase1 run (Detailed date has not been fixed): Injection test in tunnel
  • After injection test: Analysis, make report, (if possible) write paper

Sensors and instruments information

Common

Items

Numbers

Part Number

To be ordered

Ordered

We have

Comment

Amplifier

1

Not known

No

No

Yes

Head set

several

Not known

Yes

No

No

Small accelerometer

a few

Not known

No

No

Yes?

Clay(?) to fix accelerometer

a few

Not known

No

No

Yes?

Cables and connectors

many

Not known

Yes?

No

No?

Low noise filter

1

Not known

Yes

No

No

Like SR560. Hand made?

Function generator

1

Not known

No?

No

Yes?

Acoustic injection

Items

Numbers

Part Number

To be ordered

Ordered

We have

Comment

Large speaker

2

Not known

No

No

Yes

Small speaker (PZT)

1

Not known

Yes

No

No

(If possible)

Microphone

2

Not known

No

No

Yes

Seismometer

1

Not known

No

No

Yes

Earplug

several

Not known

Yes

No

No

Rubber stack

8

Not known

Yes

No

No

(If possible)

Horn

1

Not known

Yes

No

No

Magnetic injection

Items

Numbers

Part Number

To be ordered

Ordered

We have

Comment

Large Coil

2

Not known

Yes

No

No

a few Ohms, ~1 m dia.

Small Coil

1

Not known

Yes

No

No

(If possible)

Magnetometer

2

Not known

No?

No

Yes?

Small magnetometer

2

Not known

Yes

No

No

(If possible)

Shaker injection

Items

Numbers

Part Number

To be ordered

Ordered

We have

Comment

Large Magnet coil shaker

1

Not known

No

No

Yes

NAOJ

Small PZT shaker

a few

Not known

Yes

No

No

Mallet

1

Not known

Yes

No

No

Others

Items

Numbers

Part Number

To be ordered

Ordered

We have

Comment

RF antenna

2

Not known

Yes

No

No

Could be made ourselves?

RF signal amplifier

2

Not known

Yes

No

No

Could be made ourselves?

RF generator

1

Not known

Yes

No

No

(If possible. Can Moku:Lab be used?)

RF spectrum analyzer

1

Not known

No

No

Yes

Moku:Lab

To be prepared

  • CDS (Real time model, DAC, ADC, DQ)
  • Calibration (Sensors, DAC, ADC)
  • Analysis code to calculate coupling function (peaks, comb, broad)
  • Spectrogram tools

Meetings

KAGRA/Subgroups/DET/PEMinjection/bKAGRA-phase1 (last edited 2018-07-11 20:03:44 by KojiNagano)