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Update SOPHIE Alignment

watts
2024-05-02 18:32:19 +02:00
parent 5a95e4bf06
commit 7eb14bb291
1 changed files with 5 additions and 1 deletions
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SOPHIE-Alignment.md

@@ -51,7 +51,7 @@ In this design the virtual drift is determined by the long reference mirrors in
Sensor1.zCorrectMatrix[0] = 0.0
Sensor1.zCorrectMatrix[1] = 0.0
```
2. Open the interferometer EPICS panel to see the raw outputs from the J/K interferometers before they are translated into X/Y positions. These values will be in terms of fringes and can be interpreted in microns by multiplying by the sensor resolution factor set in [`start.ops`](https://gitlab.psi.ch/microspectro/pixelator/-/blob/master/PixelatorRealtime/startup/SIM/start.ops?ref_type=heads#L45) (0.0001545388). (Alternatively, turn off the transformation by setting `Sensor1.transform=0` in [`start.ops`](https://gitlab.psi.ch/microspectro/pixelator/-/blob/master/PixelatorRealtime/startup/SIM/start.ops?ref_type=heads#L49), which will also disable the software drift correction).
2. Open the interferometer EPICS panel (`xsophie-sioc-ec1:~/StartupScripts/start_panel_ZMI`) to see the raw outputs from the J/K interferometers before they are translated into X/Y positions. These values will be in terms of fringes and can be interpreted in microns by multiplying by the sensor resolution factor set in [`start.ops`](https://gitlab.psi.ch/microspectro/pixelator/-/blob/master/PixelatorRealtime/startup/SIM/start.ops?ref_type=heads#L45) (0.0001545388). (Alternatively, turn off the transformation by setting `Sensor1.transform=0` in [`start.ops`](https://gitlab.psi.ch/microspectro/pixelator/-/blob/master/PixelatorRealtime/startup/SIM/start.ops?ref_type=heads#L49), which will also disable the software drift correction).
3. Switch off the sample stage feedback by jogging the coarse sample stage.
4. Note the interferometer values and ZP-Z position.
5. Move the ZP-Z stage by a defined amount.
@@ -59,6 +59,10 @@ Sensor1.zCorrectMatrix[1] = 0.0
7. Calculate the effective mirror tilts of the J and K interferometer reference mirrors.
8. Calculate the number of screw turns required to remove the calculated tilt from the reference mirrors.
| ![start_panel_ZMI](uploads/dad9123d974015491a5cbf92559240be/start_panel_ZMI.png) |
|:--:|
| Figure 4. EPICS panel for ZMI interferometer values and diagnostics. |
If one is unable (or unwilling) to get the interferometer signal high enough to reliably lock after adjusting the reference mirrors, then the drift correction could instead be applied to the software zCorrectMatrix.
### Fix the Virtual Drift