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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 14:53] 132.235.40.102 |
playground:alpha [2010/07/16 15:05] 132.235.40.102 |
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| 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 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 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. | ||
| On the way back to the control room: | On the way back to the control room: | ||
| - | 1. Adjust buncher tubes, slit settings, and open HE and LE gate valves. | + | 1. Adjust buncher tubes, slit settings, and open HE and LE gate valves. |
| Back at the Control Console: | Back at the Control Console: | ||
| - | 1. Turn source magnet up to ~0.2 A. (likely already set) | + | 1. Turn source magnet up to ~0.2 A. (likely already set) |
| - | 2. Turn up the source gas until the pressure on the source tc gauge is ~150 microns. | + | 2. Turn up the source gas until the pressure on the source tc gauge is ~150 microns. |
| - | 3. Set the Arc Voltage to 150 V. | + | |
| - | 4. Turn on the extraction supply, it should be set for 10-12 kV.� This will also bring up exchange canal power supply to about 13 kV. | + | 3. Set the Arc Voltage to 150 V. |
| - | 5. Turn on the focus supply, it should be set for ~2 kV. | + | |
| - | 6. Turn up the sodium heater current to 0.55 A, and the filament current up slowly, over 30 seconds, until the arc starts. | + | 4. Turn on the extraction supply, it should be set for 10-12 kV.� This will also bring up exchange canal power supply to about 13 kV. |
| - | 7. When the arc starts, 70 A for an old filament, 90 A for a new filament, observe the Arc Voltage and keep it at 150 V. | + | |
| - | 8. Carry on increasing the filament current until the arc current reaches 2.5 A, keep the Arc Voltage at 150 V. | + | 5. Turn on the focus supply, it should be set for ~2 kV. |
| - | 9. Increase the sodium heater current until it reaches 0.65 A, or whatever was used the last time the source was run – check the log. | + | |
| - | 10. Set the inflection magnet to 0.8 amps and LEFT deflection. | + | 6. Turn up the sodium heater current to 0.55 A, and the filament current up slowly, over 30 seconds, until the arc starts. |
| - | 11. To obtain the maximum current adjust the following: | + | |
| + | 7. When the arc starts, 70 A for an old filament, 90 A for a new filament, observe the Arc Voltage and keep it at 150 V. | ||
| + | |||
| + | 8. Carry on increasing the filament current until the arc current reaches 2.5 A, keep the Arc Voltage at 150 V. | ||
| + | |||
| + | 9. Increase the sodium heater current until it reaches 0.65 A, or whatever was used the last time the source was run – check the log. | ||
| + | | ||
| + | 10. Set the inflection magnet to 0.8 amps and LEFT deflection. | ||
| + | | ||
| + | 11. To obtain the maximum current adjust the following: | ||
| * Focus | * Focus | ||
| * Inflection Magnet | * Inflection Magnet | ||
| * Einzel lenses A and B | * Einzel lenses A and B | ||
| * X and Y steerers | * X and Y steerers | ||
| - | 12. Typical Settings: | + | |
| + | 12. Typical Settings: | ||
| * Extraction : 12 kV @ < 1 mA | * Extraction : 12 kV @ < 1 mA | ||
| * Attachment: 13 kV @ 1 mA | * Attachment: 13 kV @ 1 mA | ||
| Line 82: | Line 93: | ||
| 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). | + | |
| - | 3. Check the source vacuum is less than 5x10-6 torr. | + | 2. Turn on source control power key at the source (if it is off). |
| - | 4. Make sure the voltage is turned down on EINZEL LENS B. | + | |
| + | 3. Check the source vacuum is less than 5x10-6 torr. | ||
| + | |||
| + | 4. Make sure the voltage is turned down on EINZEL LENS B. | ||
| In the Vault: | In the Vault: | ||
playground/alpha.txt · Last modified: 2012/11/27 08:57 by jacobs
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