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playground:alpha
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playground:alpha [2010/07/16 20:21] 184.57.89.126 |
playground:alpha [2010/07/16 20:30] 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 36: | Line 36: | ||
| 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<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 87: | Line 87: | ||
| * 2X: 5.00 | * 2X: 5.00 | ||
| - | Box Vacuum: 2.0x10E-6 torr | + | Box Vacuum: 2.0x10E<sup>-6</sup> torr |
| ** Starting from cold ** | ** Starting from cold ** | ||
| Line 99: | Line 99: | ||
| 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<sup>-6</sup> 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. | ||
| Line 105: | Line 105: | ||
| 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<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 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. | ||
| Line 117: | Line 117: | ||
| 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. | + | 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<sup>-5</sup> torr (10x10<sup>-6</sup> torr) do not proceed further until it has fallen below this value. |
| 3. Turn source magnet up to ~0.2 A. | 3. Turn source magnet up to ~0.2 A. | ||
| Line 123: | Line 123: | ||
| 4. Turn up the source gas until the pressure on the source tc gauge is ~150 microns. | 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. | + | 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<sup>-5</sup> torr (10x10<sup>-6</sup> torr) do not proceed further until it has fallen below this value. |
| 6. Set the arc voltage to 150 V. | 6. Set the arc voltage to 150 V. | ||
| Line 133: | Line 133: | ||
| 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. | 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. | + | 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<sup>-5</sup> 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. | 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. | ||
| Line 165: | Line 165: | ||
| * 2Y: 5.00 | * 2Y: 5.00 | ||
| * 2X: 5.00 | * 2X: 5.00 | ||
| - | * Box Vacuum: 2.0x10E-6 torr | + | * Box Vacuum: 2.0x10E<sup>-6</sup> torr |
| ** Starting from standby ** | ** Starting from standby ** | ||
| Line 185: | Line 185: | ||
| * 2Y: 5.00 | * 2Y: 5.00 | ||
| * 2X: 5.00 | * 2X: 5.00 | ||
| - | *Box Vacuum: 2.0x10E-6 torr | + | *Box Vacuum: 2.0x10E<sup>-6</sup> torr |
| Line 191: | Line 191: | ||
| At the Control Console: | At the Control Console: | ||
| - | 1. Check the source vacuum is less than 5x10-6 torr. | + | 1. Check the source vacuum is less than 5x10<sup>-6</sup> torr. |
| In the Vault: | In the Vault: | ||
| - | 1. Check the vacuum in the low energy extension is less than 5x10-6 torr and the source gate valve is open. | + | 1. Check the vacuum in the low energy extension is less than 5x10<sup>-6</sup> torr and the source gate valve is open. |
| On the way back to the control room: | On the way back to the control room: | ||
| Line 229: | Line 229: | ||
| * 2Y: 5.00 | * 2Y: 5.00 | ||
| * 2X: 5.00 | * 2X: 5.00 | ||
| - | *Box Vacuum: 2.0x10E-6 torr | + | *Box Vacuum: 2.0x10E<sup>-6</sup> torr |
| ** Duoplasmatron Warm Shutdown Procedure ** | ** Duoplasmatron Warm Shutdown Procedure ** | ||
| Line 280: | Line 280: | ||
| ** 3He operation ** | ** 3He operation ** | ||
| - | This assumes the source is running on 4He already and that the regulator on the 4He bottle is set for no more than 5 psig. | + | This assumes the source is running on <sup>4</sup>He already and that the regulator on the <sup>4</sup>He bottle is set for no more than 5 psig. |
| Turn down the source gas until the pressure on the source tc gauge is ~10 microns.� Stop pressing the button when the pressure is 100 microns to allow the tc gauge to catch up.� The pressure response is delayed.� Do not over-drive the source gas control as it could damage the leak valve. | Turn down the source gas until the pressure on the source tc gauge is ~10 microns.� Stop pressing the button when the pressure is 100 microns to allow the tc gauge to catch up.� The pressure response is delayed.� Do not over-drive the source gas control as it could damage the leak valve. | ||
| - | Go out to the vault and make sure a 3He bottle is ready for use. It MUST have its main valve closed at this point. | + | Go out to the vault and make sure a <sup>3</sup>He bottle is ready for use. It MUST have its main valve closed at this point. |
| - | Shut off the manifold valve near the floor that is connected to the 4He. | + | Shut off the manifold valve near the floor that is connected to the <sup>4</sup>He. |
| Start the roughing pump that is attached to the manifold and open the manifold valve leading to the pump. | Start the roughing pump that is attached to the manifold and open the manifold valve leading to the pump. | ||
| - | Open the manifold valve to the 3He regulator, also open the valve on the regulator output. | + | Open the manifold valve to the <sup>3</sup>He regulator, also open the valve on the regulator output. |
| Rough for a minute until the TC gauge on the pump is about 10 microns. | Rough for a minute until the TC gauge on the pump is about 10 microns. | ||
playground/alpha.txt · Last modified: 2012/11/27 08:57 by jacobs
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