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playground:alphatross [2022/01/31 11:53] leblanc Reformat, rewrite, and clarify. |
playground:alphatross [2022/06/08 09:05] (current) leblanc Same as last revision, which didn't have any changes. |
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== In the Control Room == | == In the Control Room == | ||
- | - Source camera must have a view of the faraday screen on the blue box of the source head. | + | - Source camera must have a view of the Faraday screen on the blue box of the source head. |
- To gain control of the source camera: On the joystick unit press "2" then "CAM" to specify the camera. | - To gain control of the source camera: On the joystick unit press "2" then "CAM" to specify the camera. | ||
- | - Use the joystick and "TELE" or "WIDE" to create a view of interest. | + | - Use the joystick and "TELE" or "WIDE" to create a view of interest. Pressing "6" followed by "Call" will move and zoom the camera appropriately. |
- If not already present, launch the Alphatross software (Version 6.0) on the source computer. | - If not already present, launch the Alphatross software (Version 6.0) on the source computer. | ||
- Press the "on" button for Water Cooling. The water cooling system: | - Press the "on" button for Water Cooling. The water cooling system: | ||
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- it should remain less than 4 x 10-6 Torr. | - it should remain less than 4 x 10-6 Torr. | ||
- Operating range is around 2 x 10-6 or less. | - Operating range is around 2 x 10-6 or less. | ||
- | - Raise the Probe Voltage to 3 kV | + | - Raise the Probe Voltage to 3 kV. |
- Check probe current to insure that it is less than 4 mA. | - Check probe current to insure that it is less than 4 mA. | ||
- | - Continue raising the probe voltage to 6kV | + | - Continue raising the probe voltage to 6kV. |
- Maintain probe current less than 4mA. High probe current may indicate: | - Maintain probe current less than 4mA. High probe current may indicate: | ||
- Source is still grounded. | - Source is still grounded. | ||
- Source is dirty and requires service. | - Source is dirty and requires service. | ||
- | - Set Extractor Voltage to 5kV. | ||
- | - Set Bias Voltage to a value that gives desired injection energy. Typical values are at least 53keV. | ||
- | - Injection energy is displayed in the upper window. | ||
- | - Injection energy is the sum of Probe, Extractor, and Bias voltages. | ||
- | - Beam yields improve above 30 keV. | ||
- | - Set the Focus Voltage to 5.5 kV | ||
- | - Set the Faraday cup meter to position 7 (alphatross cup). | ||
- | - Tune for maximum __stable__ beam. | ||
- | - Primary adjustment at this stage seems to be focus voltage. | ||
- | - Current may be on the order of 30 μA. | ||
- | |||
- | ==**DO NOT PROCEED UNTIL CHAMBER TEMPERATURE EXCEEDS 39°C**== | ||
- | |||
- Set the Oven Voltage to 80 V. | - Set the Oven Voltage to 80 V. | ||
+ | - Set Extractor Voltage to 5kV. | ||
+ | - Set Bias Voltage to a value that gives desired injection energy. Typical values are at least 53keV. | ||
+ | - Injection energy is displayed in the upper window. | ||
+ | - Injection energy is the sum of Probe, Extractor, and Bias voltages. | ||
+ | - Beam yields improve above 30 keV. | ||
+ | - Set the Focus Voltage to 5.5 kV | ||
+ | - Set the Faraday cup meter to position 7 (Alphatross cup). | ||
+ | - Tune for maximum __stable__ beam. | ||
+ | - Primary adjustment at this stage seems to be focus voltage. | ||
+ | - Current may be on the order of 30 μA. | ||
- Set Einzel Lens to 20 kV. | - Set Einzel Lens to 20 kV. | ||
- Wait until the Oven Temperature is at least 160 C, 10 - 20 minutes. | - Wait until the Oven Temperature is at least 160 C, 10 - 20 minutes. | ||
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- Click the software button "Automatic Shutdown" | - Click the software button "Automatic Shutdown" | ||
- | - Confirm you wish to quit be answering "y" | + | - Confirm you wish to quit by answering "y" |
- Walk away. | - Walk away. | ||
- ** Do not open the source gates until the process is finished ** | - ** Do not open the source gates until the process is finished ** |