Differences between revisions 4 and 6 (spanning 2 versions)

RF Photodetectors

This page (and only this page) contains all of the RF Photodetector data for the 40m. If you find pages elsewhere in this wiki, move them here.

	11 MHz	22 MHz	29.5 MHz	33 MHz	55 MHz	110 MHz
AS	/AS11				/AS55
REFL	/REFL11				/REFL55
POP
POY	/POY11
MCREFL

MOVE ALL RFPD DATA to Electronics/RFPD/

State of PD Upgrade

Name	Role\State	Schematic	Optical Response		Noise at Resonant Freq.
	REFL11	[attachment:]	[attachment:2010-05-03_REFL11_CalibratedOpticalResponse.png 0-200 MHz]	[attachment:2010-05-09_REFL11_CalibratedOpticalResponse0-500MHz_uncalibrated.png 0-500 MHz]	[attachment:2010-04-09_REFL11NoiseMeasurements.png noise]
	REFL55	[attachment:]	[attachment:2010-05-03_REFL55_CalibratedOpticalResponse.png 0-200 MHz]	[attachment:2010-05-09_REFL55_CalibratedOpticalResponse0-500MHz_uncalibrated.png 0-500 MHz]	[attachment:]
	AS55	[attachment:]	[attachment:2010-05-05_AS55_CalibratedOpticalResponse.png 0-200 MHz]	[attachment:2010-05-08_AS55_CalibratedOpticalResponse0-500MHz_uncalibrated.png 0-500 MHz]	[attachment:2010-05-05_AS55_NoiseMeasurements.png noise]
	POX	[attachment:POX11.png schematic]	[attachment:2010-05-05_POX11_CalibratedOpticalResponse_0-200MHz.png 0-200 MHz]	[attachment:2010-05-08_POX11_CalibratedOpticalResponse0-500MHz_uncalibrated.png 0-500 MHz]	[attachment:2010-05-05_POX11_NoiseMeasurements.png noise]
	POY	[attachment:POX11.png schematic]	[attachment:2010-05-05_POY11_CalibratedOpticalResponse_0-200MHz.png 0-200 MHz]	[attachment:2010-05-10_POY11_CalibratedOpticalResponse0-500MHz.png 0-500 MHz]	[attachment:2010-05-09_POY11_NoiseMeasurements.png noise]
	POP11
	POP55
	SPOB
	REFL165
	REFL33

Table of Contents

Contents

RF Photodetectors
MOVE ALL RFPD DATA to Electronics/RFPD/
Misc.

Documentation

In [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/RFPDupgradeProcedure/RFPDupgradeProcedure.pdf this document] I explain all the steps of the 40m RF PD upgrade process.

SVN Repository

All the material relative to the upgrade of the RFPD for the 40m can be found in the 40m SVN repository under the following path:

https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/

Expected Power at the Ports

Arm Length = 38m

attachment:Field_RF_Power_38m.png

Arm Length = 37.5m

attachment:Field_RF_Power_375m.png

REFL11

attachment:40mUpgradeREFL11schematic.pdf

Schematic

Changes

Converted from PD2 (ex REFL33) with the following changes:

L4: inductor 633nH
L5: trim inductor: 1.4 uH
C34: trim cap 1.5-50pF
extra capacitor in parallel to PD: 100pF
R4 (output resistance): 50 Ohm

[https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/RFPDlisoModels/RFPD11/rfpd11_testinput.fil REFL11 reference LISO model]

[https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/REFL11/REFL11Schematics/40mUpgradeREFL11schematic.pdf REFL11 New Schematic]

[https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/REFL11/2010-03-23_REFL11_model_to_meas_comparison.png REFL11 Measured Transfer Functions vs LISO model]

Data Files

[attachment:rfpd11_testinput.fil REFL11 LISO model]
[attachment:rfpd11_testinput.out REFL11 LISO model output TF]
[attachment:2010-03-23_REFL11_electronics_response.dat REFL11 Measured electronics transfer tunction data]
[attachment:2010-03-23_REFL11_optical_response.dat REFL11 Measured optical transfer tunction data]

Notes

Still To Do

add a notch at 55MHz
measure and calibrate TFs
measure noise
check signal in the time domain

REFL55

Schematic

attachment:40mUpgradeREFL55schematic.pdf

Changes

Converted from PD6 (ex REFL199) with the following changes:

D1: C30642GH
L4: surface mount inductor Coilcraft 1206CS-820XL
L5: trim inductor Coilcraft 164-04A06SL
C34: trim cap 1.5-50pF
C25: 0.1uF
R24: removed
resistor in series to L4 removed
DC out resistor changed from 300Ohm to 30Ohm
no change of output resistance: it was already 50Ohm

Data Files

[attachment:REFL55-doublenotch.fil REFL55 LISO model]
[attachment:REFL55-doublenotch.out REFL55 LISO model]
[attachment:2010-04-12_REFL55_electronics_TF_200MHz_very_final.dat REFL55 Electronics transfer function]
[attachment:2010-04-12_REFL55_optical_TF_500MHz_very_final.dat REFL55 Optical transfer function]

Still to do

measure noise
check signal in the time domain

Notes

The DC output seems 10 lower than AS55's.

AS55

Schematic

attachment:40mUpgradeAS55schematic.pdf

Changes

Converted from PD9 (ex ASDD_133) with the following changes:

removed whitening filter at the DC output
R22 changed from 100 Ohm to 10 Ohm

Data Files

[attachment:AS55-doublenotch.fil REFL55 LISO model]
[attachment:AS55-doublenotch.out REFL55 LISO model]
[attachment: REFL55 Electronics transfer function]
[attachment: REFL55 Optical transfer function]

Notes

observed occasional ~mV oscillation at DC out

Some notes from Hartmut's commissioning of this PD in 2004 in the elog entries:

Still to do

measure and calibrate TFs
measure noise
check signal in the time domain

POX11

Schematic

Changes

Data Files

Notes

Still to do

check signal in the time domain

POY11

Schematic

Changes

Output Signal

Data Files

Notes

Still to do

Things to do

measure the AM calibration with the !GHz PD (1611)
take full range transfer functions of all PDs
glue down the big coils
wipe the PD
wipe the PD box, inside and outside
take a picture of the measurement apparatus

Make label stickers for each photodiode, with:

optical response
resonant frequency
transimpedance
resonance Q
shot noise 3dB point current
notes

Misc.

[attachment:2010-05-03_JenneLaserCalibration_0dBm_NDfilter.png] [attachment:40mRFPDupgradeProcess.pdf]

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[attachment:2010-05-03_JenneLaserCalibration_0dBm_NDfilter.png]
[attachment:40mRFPDupgradeProcess.pdf]