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playground:alphatross
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playground:alphatross [2020/03/17 16:14] jacobs |
playground:alphatross [2020/06/11 08:41] jacobs |
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| ==== NEC Alphatross RF Source Instructions ==== | ==== NEC Alphatross RF Source Instructions ==== | ||
| - | THESE ARE DRAFT INSTRUCTIONS WRITTEN REMOTELY. THERE MAY BE OMISSIONS AND INCORRECT NOMENCLATURE, USE YOUR OWN JUDGEMENT... | ||
| - | |||
| ** __START UP__ ** | ** __START UP__ ** | ||
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| - Raise the Probe Voltage to 3 KV as a start, this might be enough to get the plasma going. | - Raise the Probe Voltage to 3 KV as a start, this might be enough to get the plasma going. | ||
| - If there is still no plasma try raising the Mass Flow setting to as much as .5 SCCM to inspire ignition and then return to .35 SCCM. | - If there is still no plasma try raising the Mass Flow setting to as much as .5 SCCM to inspire ignition and then return to .35 SCCM. | ||
| + | - **This is a pause point for source clean up, can run like this for days, should reduce probe current over time** | ||
| - Monitor the Probe Current, maintain 3 mA +/- 1 mA, and continue raising the Probe Voltage until it reaches 6.5 KV. | - Monitor the Probe Current, maintain 3 mA +/- 1 mA, and continue raising the Probe Voltage until it reaches 6.5 KV. | ||
| - Set the Oven Voltage to 87 V, wait ten minutes. After 10 minutes the Oven Temp should be around 150 C. | - Set the Oven Voltage to 87 V, wait ten minutes. After 10 minutes the Oven Temp should be around 150 C. | ||
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| - Set Lens A to 10 KV and source Einzel Lens to 15 KV initially and use the inflection magnet to pass beam on to the LE faraday cup. Tune both lenses and magnet for optimum conditions. The BPM may be useful too. | - Set Lens A to 10 KV and source Einzel Lens to 15 KV initially and use the inflection magnet to pass beam on to the LE faraday cup. Tune both lenses and magnet for optimum conditions. The BPM may be useful too. | ||
| - You may need to re-tune with Extractor, Bias, and Focus Voltages and Mass Flow setting. Each voltage tune will affect the inflection magnet. | - You may need to re-tune with Extractor, Bias, and Focus Voltages and Mass Flow setting. Each voltage tune will affect the inflection magnet. | ||
| + | - The maximum Oven Temperature is around 190 C, seems to be around 91 Volts. At this point Rb begins to escape the chamber and the beam becomes twitchy. If the beam is unstable briefly reduce the Oven Voltage until stabile beam and return Oven Voltage to a slightly lesser value. | ||
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| + | ** __SHUT DOWN__ ** | ||
| + | |||
| + | - Click the software button "Automatic Shutdown" | ||
| + | - Confirm you wish to quit be answering "y" | ||
| + | - Walk away. | ||
| + | - ** Do not open the source gates until the process is finished ** | ||
| + | - This process puts in the cup, closes the gate valve, and shuts down the source as things cool to proper levels. | ||
| + | - The automated process can be stopped by clicking the "Automatic Shutdown" again. | ||
| + | |||
playground/alphatross.txt ยท Last modified: 2022/06/08 09:05 by leblanc
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