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Size: 1819
Comment:
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Size: 1895
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| . this is a preliminary design for the electronics used in green locking <<ImageLink(green_electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram ,height=200)>> |
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| Line 8: | Line 6: |
| Need 2 ADCs and 3 DAC channels per end | . Need 2 ADCs and 3 DAC channels per end |
| Line 13: | Line 11: |
| PDH signal (used to modify laser frequency) | . PDH signal (used to modify laser frequency) |
| Line 15: | Line 13: |
| Green laser power monitor | . Green laser power monitor |
| Line 18: | Line 16: |
| PDH lock gain control output | . PDH lock gain control output |
| Line 20: | Line 18: |
| PDH phase adjustment control | . PDH phase adjustment control |
| Line 22: | Line 20: |
| Thermal stabilization of the laser control (is controlled by PDH signal, need a filter bank in between) (need a multiplying constant which is linked to the constant controlling feedback to the coils (inversely)) | . Thermal stabilization of the laser control (is controlled by PDH signal, need a filter bank in between) (need a multiplying constant which is linked to the constant controlling feedback to the coils (inversely)) |
| Line 24: | Line 22: |
| Via the normal control path: ETM position control (feed into the coil outputs) | . Via the normal control path: ETM position control (feed into the coil outputs) |
| Line 27: | Line 25: |
| Need 7 ADCs and 4 DACs at the PSL | . Need 7 ADCs and 4 DACs at the PSL |
| Line 30: | Line 28: |
| Phased locked loop signal from mixer. Need 1 per arm (2). | . Phased locked loop signal from mixer. Need 1 per arm (2). |
| Line 32: | Line 30: |
| RFPD DC mon. Need 1 per arm (2). | . RFPD DC mon. Need 1 per arm (2). |
| Line 34: | Line 32: |
| Green Power mon. Need only 1. | . Green Power mon. Need only 1. |
| Line 36: | Line 34: |
| Frequency discriminator signal. Need 1 per arm (2). | . Frequency discriminator signal. Need 1 per arm (2). |
| Line 39: | Line 37: |
| Take PLL signal and pass into a filter bank (with offset and filter). This is the fine control path. | . Take PLL signal and pass into a filter bank (with offset and filter). This is the fine control path. |
| Line 41: | Line 39: |
| Take frequency discriminator signal, pass into a filter bank. This is coarse control path. | . Take frequency discriminator signal, pass into a filter bank. This is coarse control path. |
| Line 43: | Line 41: |
| Need a epics channel to be controlled manually or via script to set ratio of sums for coarse and fine control path for ETM (so this feeds into coils for the ETM, going to need RFM channels then) | . Need a epics channel to be controlled manually or via script to set ratio of sums for coarse and fine control path for ETM (so this feeds into coils for the ETM, going to need RFM channels then) |
| Line 48: | Line 46: |
| Voltage Controlled Oscillator offset control (needs a input from epics initially) Need 1 per arm (2). | . Voltage Controlled Oscillator offset control (needs a input from epics initially) Need 1 per arm (2). [[BR]] [[BR]] . this is a preliminary design for the electronics used in green locking <<ImageLink(green_electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram ,height=400)>> |
| Line 52: | Line 57: |
| 3 Ovens, 1 each end, 1 at PSL | . 3 Ovens, 1 each end, 1 at PSL |
| Line 54: | Line 59: |
| Ovens talk to a GPIB interface for temperature readback and set point | . Ovens talk to a GPIB interface for temperature readback and set point |
| Line 62: | Line 67: |
| 1) Whitening/Dewhiten signals from Green | . 1) Whitening/Dewhiten signals from Green |
Each front end at the ends
- Need 2 ADCs and 3 DAC channels per end
Inputs via ADC:
- PDH signal (used to modify laser frequency)
- Green laser power monitor
Outputs via DAC:
- PDH lock gain control output
- PDH phase adjustment control
- Thermal stabilization of the laser control (is controlled by PDH signal, need a filter bank in between) (need a multiplying constant which is linked to the constant controlling feedback to the coils (inversely))
- Via the normal control path: ETM position control (feed into the coil outputs)
Vertex Front End
- Need 7 ADCs and 4 DACs at the PSL
Inputs via ADC:
- Phased locked loop signal from mixer. Need 1 per arm (2).
- RFPD DC mon. Need 1 per arm (2).
- Green Power mon. Need only 1.
- Frequency discriminator signal. Need 1 per arm (2).
In digital land:
- Take PLL signal and pass into a filter bank (with offset and filter). This is the fine control path.
- Take frequency discriminator signal, pass into a filter bank. This is coarse control path.
- Need a epics channel to be controlled manually or via script to set ratio of sums for coarse and fine control path for ETM (so this feeds into coils for the ETM, going to need RFM channels then)
Outputs via DAC:
- Voltage Controlled Oscillator control. Need 1 per arm (2).
- Voltage Controlled Oscillator offset control (needs a input from epics initially) Need 1 per arm (2).
- this is a preliminary design for the electronics used in green locking
Somewhat related, but not a front end issue:
- 3 Ovens, 1 each end, 1 at PSL
- Ovens talk to a GPIB interface for temperature readback and set point
Questions:
- 1) Whitening/Dewhiten signals from Green