|
Size: 2314
Comment:
|
Size: 2717
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| = Electronics = == outline == |
= outline = |
| Line 9: | Line 7: |
| <<TableOfContents(2)>> |
|
| Line 12: | Line 13: |
| == VCO == === Filter respons === |
= VCO for frequency tracking = == VCO range == . Synergy VCO part number XXX has 1.2MHz/V VCO range. attachment:VCO_range.png == Filter respons == |
| Line 16: | Line 22: |
| === Noise performance === | attachment:VCO_filter.png |
| Line 18: | Line 24: |
| === lock detection and boost === | == Noise performance == == lock detection and boost == |
| Line 25: | Line 33: |
| == PDH box == === Filter Shape === |
= PDH box = == Filter Shape == attachment:TF_PDH.png |
| Line 28: | Line 37: |
| === Noise performance === | == Noise performance == |
| Line 30: | Line 39: |
| === LPF for RF cutoff === | == LPF for RF cutoff == |
| Line 32: | Line 41: |
| === Low frequency mixer === | == Low frequency mixer == |
| Line 34: | Line 43: |
| === Remotely controlled Boost switch === | == Remotely controlled Boost switch == |
| Line 38: | Line 47: |
| == frequency counter == | = frequency counter = |
| Line 52: | Line 61: |
| == digital channel assign == | = digital channel assign = |
| Line 59: | Line 68: |
| == whitening filter == . what is the specification for each channel [[BR]] ----- == wideband RFPD for green PLL == |
= wideband RFPD for green PLL = |
| Line 69: | Line 72: |
| === frequency response === | == frequency response == |
| Line 72: | Line 75: |
| === noise performance === | == noise performance == |
| Line 80: | Line 83: |
| == DC PDs == === PDA36A === |
= DC PDs = == PDA36A == |
| Line 91: | Line 94: |
| == digital front end == | = digital front end filters= |
| Line 97: | Line 100: |
| . whitening filter |
|
| Line 99: | Line 104: |
| == Thermal compensation LPF == === circuit diagram === |
= Thermal feedback LPF = == circuit diagram == |
| Line 103: | Line 108: |
| === expected transfer function of composed frequency actuator === | == expected transfer function of composed frequency actuator == |
| Line 107: | Line 112: |
| == Function Generator == | ----- = Function Generator = |
| Line 111: | Line 117: |
[[BR]] = Summing Amplifier = In order to send a feedback signal and modulation signal to the laser PZT, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz. == Diagram == == noise performance == |
|
| Line 113: | Line 130: |
| == Power Supply and Cables == === HV cables (-150V) for photodiode bias === === 15V and 24V lines === |
= Temperature Controller for doubling oves = . TC200 from Thorlabs [[BR]] ----- = Power Supply and Cables = == HV cables (-150V) for photodiode bias == == 15V and 24V lines == |
outline
- Preliminary design for the electronics used in 40m green locking.
Contents
VCO for frequency tracking
VCO range
- Synergy VCO part number XXX has 1.2MHz/V VCO range.
attachment:VCO_range.png
Filter respons
- 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
attachment:VCO_filter.png
Noise performance
lock detection and boost
- rms detection
PDH box
Filter Shape
attachment:TF_PDH.png
Noise performance
LPF for RF cutoff
Low frequency mixer
Remotely controlled Boost switch
frequency counter
- SR620 is employed to read out the frequency of the beat signal.
attachment:SR620.png
setting parameters |
||
readout range |
|
MHz |
DAC bit resolution |
|
|
noise |
|
|
digital channel assign
wideband RFPD for green PLL
- A Silicon photodiode with the diameter of 10mm is used. To have a fast response up to about 1MHz -150V is applied onto the photo diode.
The schematic is available on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn]
frequency response
attachment:RFPD_tf.png
noise performance
attachment:RFPDnoise.png
Here is the noise model for the RFPD using liso. attachment:liso_RFPD.png
DC PDs
PDA36A
- attachment:PDA36A.png
parameters |
|||
trans impedance gain |
|
[V/A] |
|
responsibility |
|
[A/W] |
|
quantum efficiency |
|
[%] |
|
= digital front end filters=
- anti-aliasing filter
- anti-imaging filter
- whitening filter
Thermal feedback LPF
circuit diagram
attachment:thermalLPF.png
expected transfer function of composed frequency actuator
attachment:thermal_actuator.png
Function Generator
- To get a phase modulation imposed on the end IR lasers, a function generator is needed.
SR___
Summing Amplifier
In order to send a feedback signal and modulation signal to the laser PZT, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz.
Diagram
noise performance
Temperature Controller for doubling oves
. TC200 from Thorlabs
Power Supply and Cables
HV cables (-150V) for photodiode bias