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Size: 1339
Comment:
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Size: 1679
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| Each front end at the ends | = Each front end at the ends = Need 2 ADCs and 3 DAC channels per end |
| Line 3: | Line 4: |
| Inputs via ADC: |
== Inputs via ADC: == |
| Line 7: | Line 7: |
| Green laser power monitor | Green laser power monitor |
| Line 9: | Line 9: |
| Outputs via DAC: | == Outputs via DAC: == |
| Line 16: | Line 16: |
| 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 18: |
| = Vertex Front End = Need 7 ADCs and 4 DACs at the PSL |
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| Line 20: | Line 21: |
| Vertex Front End | == Inputs via ADC: == Phased locked loop signal from mixer. Need 1 per arm (2). |
| Line 22: | Line 24: |
| Inputs via ADC: | RFPD DC mon. Need 1 per arm (2). |
| Line 24: | Line 26: |
| Phased locked loop signal from mixer | Green Power mon. Need only 1. |
| Line 26: | Line 28: |
| In digital land: Frequency discriminator signal |
Frequency discriminator signal. Need 1 per arm (2). |
| Line 29: | Line 30: |
| == In digital land: == | |
| Line 35: | Line 37: |
| Outputs via DAC Voltage Controlled Oscillator control |
== Outputs via DAC: == . Voltage Controlled Oscillator control. Need 1 per arm (2). |
| Line 38: | Line 40: |
| Voltage Controlled Oscillator offset control (needs a input from epics initially) | Voltage Controlled Oscillator offset control (needs a input from epics initially) Need 1 per arm (2). |
| Line 41: | Line 43: |
| Somewhat related, but not a front end issue: |
== Somewhat related, but not a front end issue: == |
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| Ovens talk to a GPIB interface for temperature readback and set point | Ovens talk to a GPIB interface for temperature readback and set point ---- Questions: 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).
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