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playground:alpha
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playground:alpha [2010/07/16 15:09] 132.235.40.102 |
playground:alpha [2010/07/16 15:41] 132.235.40.102 |
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| This applies when the source had been at atmosphere for any reason, including cleaning, sodium refill, or filament replacement. It also applies if the sodium canal heater has been off or at zero current for more than one day. | This applies when the source had been at atmosphere for any reason, including cleaning, sodium refill, or filament replacement. It also applies if the sodium canal heater has been off or at zero current for more than one day. | ||
| + | |||
| At the Control Console: | At the Control Console: | ||
| - | + | ||
| 1. Turn on main control power key (if it is off). | 1. Turn on main control power key (if it is off). | ||
| - | + | ||
| 2. Turn on source control power key at the source (if it is off). | 2. Turn on source control power key at the source (if it is off). | ||
| - | + | ||
| 3. Check the source vacuum is less than 5x10-6 torr. | 3. Check the source vacuum is less than 5x10-6 torr. | ||
| - | + | ||
| 4. Make sure the voltage is turned down on EINZEL LENS B. | 4. Make sure the voltage is turned down on EINZEL LENS B. | ||
| In the Vault: | In the Vault: | ||
| - | 1. Check the vacuum in the low energy extension is less than 5x10-6 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 5x10-6 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 it 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 attached to the helium manifold. | + | |
| + | 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 it 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 attached to the helium manifold. | ||
| On the way back to the control room: | On the way back to the control room: | ||
| - | 2. Adjust buncher tubes, slit settings, and open HE and LE gate valves. | + | 2. Adjust buncher tubes, slit settings, and open HE and LE gate valves. |
| Back at the Control Console: | Back at the Control Console: | ||
| - | 1. Increase the sodium heater current slowly, over 30 seconds, to 0.3 A. | + | 1. Increase the sodium heater current slowly, over 30 seconds, to 0.3 A. |
| - | 2. Observe the source pressure, it will probably rise especially if the sodium has just been changed. Wait twenty minutes, if the pressure after this time is greater than 1x10-5 torr (10x10-6 torr) do not proceed further until it has fallen below this value. | + | |
| - | 3. Turn source magnet up to ~0.2 A. | + | 2. Observe the source pressure, it will probably rise especially if the sodium has just been changed. Wait twenty minutes, if the pressure after this time is greater than 1x10-5 torr (10x10-6 torr) do not proceed further until it has fallen below this value. |
| - | 4. Turn up the source gas until the pressure on the source tc gauge is ~150 microns. | + | |
| - | 5. Slowly, over 30 seconds, run up the filament current to ~40 amps. Wait twenty minutes, if the pressure after this time is greater than 1x10-5 torr (10x10-6 torr) do not proceed further until it has fallen below this value. | + | 3. Turn source magnet up to ~0.2 A. |
| - | 6. Set the arc voltage to 150 V. | + | |
| - | 7. Turn on the extraction supply, it should be set for 10-12 kV.� This will also turn on the exchange canal power supply, usually set at 13 to 16 kV. | + | 4. Turn up the source gas until the pressure on the source tc gauge is ~150 microns. |
| - | 8. Turn on the focus supply, it should be set for ~2 kV. | + | |
| - | 9. If the exchange canal power supply did not come on with the extractor, check the toggle switch at the lower, right corner of the supply to make sure its on. | + | 5. Slowly, over 30 seconds, run up the filament current to ~40 amps. Wait twenty minutes, if the pressure after this time is greater than 1x10-5 torr (10x10-6 torr) do not proceed further until it has fallen below this value. |
| - | 10. Increase the sodium heater current by ~0.05 A and the filament current by ~10 A every twenty minutes. Make sure the pressure does not rise over 1x10-5 torr, if it does, do not proceed further until it has fallen below this value. | + | |
| - | 11. When the arc starts, 70 A for a dirty source or old filament, 90 A for a new filament in a clean source, observe the arc voltage and keep it at 150 V. | + | 6. Set the arc voltage to 150 V. |
| - | 12. Carry on increasing the filament current until the arc current reaches 2.5 A, keep the arc voltage at 150 V. | + | |
| + | 7. Turn on the extraction supply, it should be set for 10-12 kV.� This will also turn on the exchange canal power supply, usually set at 13 to 16 kV. | ||
| + | |||
| + | 8. Turn on the focus supply, it should be set for ~2 kV. | ||
| + | |||
| + | 9. If the exchange canal power supply did not come on with the extractor, check the toggle switch at the lower, right corner of the supply to make sure its on. | ||
| + | |||
| + | 10. Increase the sodium heater current by ~0.05 A and the filament current by ~10 A every twenty minutes. Make sure the pressure does not rise over 1x10-5 torr, if it does, do not proceed further until it has fallen below this value. | ||
| + | |||
| + | 11. When the arc starts, 70 A for a dirty source or old filament, 90 A for a new filament in a clean source, observe the arc voltage and keep it at 150 V. | ||
| + | |||
| + | 12. Carry on increasing the filament current until the arc current reaches 2.5 A, keep the arc voltage at 150 V. | ||
| 13. Increase the heater current in 0.05 A steps until it reaches 0.6 A. | 13. Increase the heater current in 0.05 A steps until it reaches 0.6 A. | ||
| 14. Set inflection magnet to 0.8 amps and LEFT deflection. | 14. Set inflection magnet to 0.8 amps and LEFT deflection. | ||
playground/alpha.txt · Last modified: 2012/11/27 08:57 by jacobs
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