User Tools
playground:alpha
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
playground:alpha [2010/07/16 20:29] 184.57.89.126 |
playground:alpha [2010/07/30 10:32] 132.235.40.102 |
||
|---|---|---|---|
| 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 46: | Line 46: | ||
| Back at the Control Console: | Back at the Control Console: | ||
| - | 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 1.4 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. | ||
| - | 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. | + | 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. |
| 5. Turn on the focus supply, it should be set for ~2 kV. | 5. Turn on the focus supply, it should be set for ~2 kV. | ||
| Line 62: | Line 62: | ||
| 8. Carry on increasing the filament current until the arc current reaches 2.5 A, keep the Arc Voltage 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. | + | 9. Increase the sodium heater current until it reaches 0.6 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. | + | 10. Set the inflection magnet to about 0.8 amps and LEFT deflection. |
| 11. To obtain the maximum current adjust the following: | 11. To obtain the maximum current adjust the following: | ||
| Line 74: | Line 74: | ||
| 12. Typical Settings: | 12. Typical Settings: | ||
| * Extraction : 12 kV @ < 1 mA | * Extraction : 12 kV @ < 1 mA | ||
| - | * Attachment: 13 kV @ 1 mA | + | * Exchange Canal: 13 kV @ 1 mA |
| * Focus: 2 kV @ 1.5 mA | * Focus: 2 kV @ 1.5 mA | ||
| - | * Magnet : 0.2 A | + | * Magnet : 0.2 - 1.4A |
| - | * Heater: 0.67 A | + | * Heater: 0.65 A |
| * Arc Voltage: 150 V | * Arc Voltage: 150 V | ||
| * Filament Current: 70 - 90 amps | * Filament Current: 70 - 90 amps | ||
| Line 121: | Line 121: | ||
| 3. Turn source magnet up to ~0.2 A. | 3. Turn source magnet up to ~0.2 A. | ||
| - | 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 ~300 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<sup>-5</sup> torr (10x10<sup>-6</sup> 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. | ||
| Line 127: | Line 127: | ||
| 6. Set the arc voltage to 150 V. | 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. | + | 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. | 8. Turn on the focus supply, it should be set for ~2 kV. | ||
| Line 141: | Line 141: | ||
| 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. |
| 15. Tune for beam in the LE cup by adjusting inflection magnet, source Einzel lens ( EINZEL LENS B), the low energy extension Einzel lens (EINZEL LENS A), and the 2Y, 2X steerers. It may take two hours before even one nanoamp of current is detectable, especially for freshly cleaned sodium canal | 15. Tune for beam in the LE cup by adjusting inflection magnet, source Einzel lens ( EINZEL LENS B), the low energy extension Einzel lens (EINZEL LENS A), and the 2Y, 2X steerers. It may take two hours before even one nanoamp of current is detectable, especially for freshly cleaned sodium canal | ||
playground/alpha.txt · Last modified: 2012/11/27 08:57 by jacobs
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 3.0 Unported
