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Size: 1679
Comment:
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Size: 1878
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 2: | Line 8: |
| Need 2 ADCs and 3 DAC channels per end | . Need 2 ADCs and 3 DAC channels per end |
| Line 5: | Line 13: |
| PDH signal (used to modify laser frequency) | . PDH signal (used to modify laser frequency) |
| Line 7: | Line 15: |
| Green laser power monitor | . Green laser power monitor |
| Line 10: | Line 18: |
| PDH lock gain control output | . PDH lock gain control output |
| Line 12: | Line 20: |
| PDH phase adjustment control | . PDH phase adjustment control |
| Line 14: | Line 22: |
| 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 16: | Line 24: |
| 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 19: | Line 27: |
| Need 7 ADCs and 4 DACs at the PSL | . Need 7 ADCs and 4 DACs at the PSL |
| Line 22: | Line 30: |
| Phased locked loop signal from mixer. Need 1 per arm (2). | . Phased locked loop signal from mixer. Need 1 per arm (2). |
| Line 24: | Line 32: |
| RFPD DC mon. Need 1 per arm (2). | . RFPD DC mon. Need 1 per arm (2). |
| Line 26: | Line 34: |
| Green Power mon. Need only 1. | . Green Power mon. Need only 1. |
| Line 28: | Line 36: |
| Frequency discriminator signal. Need 1 per arm (2). | . Frequency discriminator signal. Need 1 per arm (2). |
| Line 31: | Line 39: |
| 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 33: | Line 41: |
| 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 35: | Line 43: |
| 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 40: | Line 48: |
| 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). |
| Line 44: | Line 52: |
| 3 Ovens, 1 each end, 1 at PSL | . 3 Ovens, 1 each end, 1 at PSL |
| Line 46: | Line 54: |
| 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 53: | Line 62: |
| 1) Whitening/Dewhiten signals from Green | . 1) Whitening/Dewhiten signals from Green |
- this is a preliminary design for the electronics used in green locking
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).
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