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playground:alpha
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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playground:alpha [2010/07/16 20:28] 184.57.89.126 |
playground:alpha [2010/07/16 20:32] 184.57.89.126 |
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| You need to determine what the state of the source is before you do anything. Depending on the electrical and vacuum status the source will be starting from cold, warm, or standby. | You need to determine what the state of the source is before you do anything. Depending on the electrical and vacuum status the source will be starting from cold, warm, or standby. | ||
| - | The first check you need to make is on the vacuum status of the source. The source pressure should be less than 5x10-6 torr. If it is not find out why before going any further. | + | The first check you need to make is on the vacuum status of the source. The source pressure should be less than 5x10<sup>-6</sup> torr. If it is not find out why before going any further. |
| If the control power for the machine, and/or for the source are off, or if the sodium canal supply is off or at zero current, you are starting from the cold state. | If the control power for the machine, and/or for the source are off, or if the sodium canal supply is off or at zero current, you are starting from the cold state. | ||
| Line 38: | Line 38: | ||
| 1. Check the vacuum in the low energy extension is less than 5x10<sup>-6</sup> torr then open the tube gate valve on the ion source vacuum control panel. | 1. Check the vacuum in the low energy extension is less than 5x10<sup>-6</sup> torr then open the tube gate valve on the ion source vacuum control panel. | ||
| - | 2. Check valve on gas supply bottle is open and regulator set for ~5 psig. Note this will be the case unless work has been done on the gas supply systems, the supply bottle is very low (causing the regulator to read high), or you are changing between 4He and 3He. See instructions below on running 3He. If is suspected that there is air or another contaminant in the gas lines then they should be roughed out and purged three times using the roughing pump on the leak checker. | + | 2. Check valve on gas supply bottle is open and regulator set for ~5 psig. Note this will be the case unless work has been done on the gas supply systems, the supply bottle is very low (causing the regulator to read high), or you are changing between <sup>4</sup>He and <sup>3</sup>He. See instructions below on running <sup>3</sup>He. If is suspected that there is air or another contaminant in the gas lines then they should be roughed out and purged three times using the roughing pump on the leak checker. |
| On the way back to the control room: | On the way back to the control room: | ||
| Line 48: | Line 48: | ||
| 1. Turn source magnet up to ~0.2 A. (likely already set, and it can be as high as 1 A) | 1. Turn source magnet up to ~0.2 A. (likely already set, and it can be as high as 1 A) | ||
| - | 2. Turn up the source gas until the pressure on the source tc gauge is between 300 and 500 microns (sometimes higher pressures are needed to start the source). | + | 2. Turn up the source gas until the pressure on the source tc gauge is between 300 and 500 microns (sometimes higher pressures are needed to start the source, but the source will run as low as 150 microns and the lower the pressure the better the quality of the beam and the less gas is used: a consideration when running <sup>3</sup>He). |
| 3. Set the Arc Voltage to 150 V. | 3. Set the Arc Voltage to 150 V. | ||
playground/alpha.txt ยท Last modified: 2012/11/27 08:57 by jacobs
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