Spin flip/quarter wave plate calibration
From Hall A Wiki
This page summarize the calibration data for quarter wave plate holders, which control the pumping laser polarization of Hall A He3 Polarized Target.
Contents
Connection Map
| Pumping Direction | Laser Component | Motor ID | Laser Platform Patch Panel | 50Ft Ext. Cable ID | Controller ID |
|---|---|---|---|---|---|
| Longitudinal | S Wave | 1 (tested & taken out) | 1 | 1 | None |
| Longitudinal | P Wave | 2 (tested & taken out) | 2 | 2 | None |
| Transverse | S Wave | 3 | 3 | 3 | 0338 |
| Transverse | P Wave | 4 | 4 | 4 | 1474 |
| Vertical | S Wave | 5 | 5 | 5 | 1426 |
| Vertical | P Wave | 6 | 6 | 6 | 1423 |
Current Setting
Log
- Summer 2008, Init calibration
- Dec 02, 2008, Transverse Laser Absorption Calibration
- Try to rotate motor # 0338 and # 1474 to maximize absorption spectrum @ 795.1nm
- Condition: Transvers -; Spin -; 3x Comet Laser
- Result : Get maximize absorption peak @ 0338 = 3 (Degree, readback); 1474=-84 (Degree, readback)
- May 22, 2009; Recalibrate Motor #3 and #4 in lab. Their calibration angle kept unchanged. However, Auto calibration Error of motor #3 shifted from -1.5 to 0.2
Setting Table
| Motor ID | Controller ID | Description | Alignment Angle/Degree | Auto calibration Error/Degree | Spin Up Read Back/Degree | Spin Down Read Back/Degree |
|---|---|---|---|---|---|---|
| 1 | N/A | Not In Use | 8.4 | 0.15 | 8.25 | -81.75 |
| 2 | N/A | Not In Use | 8.5 | 0.40 | 8.10 | -81.90 |
| 3 | 0338 | Transverse S Wave | 7.5 | 0.2 | 7.3 | -82.70 |
| 4 | 1474 | Transverse P Wave | 8.8 | 0.00 | 8.80 | -81.20 |
| 5 | 1426 | Vertical S Wave | 10.8 | 0.40 | 10.40 | -79.60 |
| 6 | 1423 | Vertical P Wave | 9.8 | 1.00 | 8.80 | -81.20 |
- Motor ID : The sticker attached to the motor
- Controller ID : ID number of control connected to the motor
- Alignment Angle : When the mark of Q-wave plate is at this angle, all plates will convert a vertical polarized laser to a circular polarized one. Besides, the polarization direction is the same.
- Auto calibration error : is the marker angle on the plate holder, while the holder is shown to be rotated to 0 degree on the computer. The reason why it is not 0, is due to non-perfect precision of automatic calibration.
- Position Up/Down Read Back: The angle setting on the computer for spin state Up/Down.
Old Settings
Before May 22,2009
| Motor ID | Controller ID | Description | Alignment Angle/Degree | Auto calibration Error/Degree | Spin Up Read Back/Degree | Spin Down Read Back/Degree |
|---|---|---|---|---|---|---|
| 1 | N/A | Not In Use | 8.4 | 0.15 | 8.25 | -81.75 |
| 2 | N/A | Not In Use | 8.5 | 0.40 | 8.10 | -81.90 |
| 3 | 0338 | Transverse S Wave | 7.5 | -1.50 | 6.5 (Dec 02, 2008 re-calib) | -83.5 (Dec 02, 2008 re-calib) |
| 4 | 1474 | Transverse P Wave | 8.8 | 0.00 | 6.5 (Dec 02, 2008 re-calib) | -83.5 (Dec 02, 2008 re-calib) |
| 5 | 1426 | Vertical S Wave | 10.8 | 0.40 | 10.40 | -79.60 |
| 6 | 1423 | Vertical P Wave | 9.8 | 1.00 | 8.80 | -81.20 |
- Motor ID : The sticker attached to the motor
- Controller ID : ID number of control connected to the motor
- Alignment Angle : When the mark of Q-wave plate is at this angle, all plates will convert a vertical polarized laser to a circular polarized one. Besides, the polarization direction is the same.
- Auto calibration error : is the marker angle on the plate holder, while the holder is shown to be rotated to 0 degree on the computer. The reason why it is not 0, is due to non-perfect precision of automatic calibration.
- Position Up/Down Read Back: The angle setting on the computer for spin state Up/Down.
Before Dec 2, 2008
| Motor ID | Controller ID | Description | Alignment Angle/Degree | Auto calibration Error/Degree | Spin Up Read Back/Degree | Spin Down Read Back/Degree |
|---|---|---|---|---|---|---|
| 1 | N/A | Not In Use | 8.4 | 0.15 | 8.25 | -81.75 |
| 2 | N/A | Not In Use | 8.5 | 0.40 | 8.10 | -81.90 |
| 3 | 0338 | Transverse S Wave | 7.5 | -1.50 | 9.00 | -81.00 |
| 4 | 1474 | Transverse P Wave | 8.8 | 0.00 | 8.80 | -81.20 |
| 5 | 1426 | Vertical S Wave | 10.8 | 0.40 | 10.40 | -79.60 |
| 6 | 1423 | Vertical P Wave | 9.8 | 1.00 | 8.80 | -81.20 |
- Motor ID : The sticker attached to the motor
- Controller ID : ID number of control connected to the motor
- Alignment Angle : When the mark of Q-wave plate is at this angle, all plates will convert a vertical polarized laser to a circular polarized one. Besides, the polarization direction is the same.
- Auto calibration error : is the marker angle on the plate holder, while the holder is shown to be rotated to 0 degree on the computer. The reason why it is not 0, is due to non-perfect precision of automatic calibration.
- Position Up/Down Read Back: The angle setting on the computer for spin state Up/Down.
Currently Empty
