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playground:alpha [2010/07/16 20:32]
184.57.89.126
playground:alpha [2012/11/27 08:37]
jacobs
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 ** Duoplasmatron Instructions ** ** Duoplasmatron Instructions **
  
-Please study the diagram.  +**Please study the diagram ​below.** 
-{{playground:​duoplasmatron.jpg|}}+ 
 +{{playground:​duo.jpg|}}
  
  
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 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, 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).+2. Turn up the source gas until the pressure on the source tc gauge is ~300 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 ~190 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.
  
-6. Turn up the sodium heater current to 0.55 A, and the filament current up slowly, over 30 seconds, until the arc starts.+6. Turn up the sodium heater current to 0.55 A.
  
-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.+7. Slowly turn up the Filament Current to 40-50 A and wait 5 minutes. ​ Continue to raise the Filament Current until the arc starts, ​60 A for an old filament, ​70 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. 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 ​up to 0.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:
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 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: ​                    0.58 A
           * Arc Voltage: ​        150 V           * Arc Voltage: ​        150 V
           * Filament Current: ​    70 - 90 amps           * Filament Current: ​    70 - 90 amps
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           * 2Y:                          5.00           * 2Y:                          5.00
           * 2X:                          5.00           * 2X:                          5.00
- +          * Box Vacuum: ​    ​2.0x10E<​sup>​-6</​sup> ​ torr
-Box Vacuum: ​    ​2.0x10E<​sup>​-6</​sup> ​ torr+
  
 ** Starting from cold ** ** Starting from cold **
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 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. 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. (likely already set, and it can be as high as 1.4 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.
  
-6. Set the arc voltage to 150 V.+6. Set the arc voltage to ~190 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.
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 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. 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. Slowly turn up the Filament Current until the arc starts.  ​When the arc starts, ​60 A for an old filament, ​70 a for a new filament, 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. 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.A.+13. Increase the heater current in 0.05 A steps until it reaches 0.57 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
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 17. Typical Settings: 17. 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 +          * Heater: ​                    0.58 
-          * Arc voltage:         150 V+          * Arc Voltage:         150 V
           * Filament Current: ​    70 - 90 amps           * Filament Current: ​    70 - 90 amps
           * Arc Current: ​            2.5 amps           * Arc Current: ​            2.5 amps
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 1. Typical Settings: 1. 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 
-          * Sodium ​Heater: ​        ​0.55 A+          * Heater: ​                    ​0.55 A
           * Arc Voltage: ​        150 V           * Arc Voltage: ​        150 V
           * Filament Current: ​    70 - 90 amps           * Filament Current: ​    70 - 90 amps
-          * Arc Current: ​            0.75 amps+          * Arc Current: ​            2.amps
           * Source lens:             2 kV           * Source lens:             2 kV
           * Lens A:                    <5 kV           * Lens A:                    <5 kV
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           * 2Y:                          5.00           * 2Y:                          5.00
           * 2X:                          5.00           * 2X:                          5.00
-          *Box Vacuum: ​    ​2.0x10E<​sup>​-6</​sup> ​ torr+          * Box Vacuum: ​    ​2.0x10E<​sup>​-6</​sup> ​ torr
  
  
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 1. Increase the filament current until the arc current reaches 2.5 A, keep the Arc Voltage at 150 V. 1. Increase the filament current until the arc current reaches 2.5 A, keep the Arc Voltage at 150 V.
  
-2. 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.+2. Increase the sodium heater current ​ until it reaches ​up to 0.A, **or whatever was used the last time** the source was run – check the log.
  
 3. Set the inflection magnet to 0.8 amps and LEFT deflection. 3. Set the inflection magnet to 0.8 amps and LEFT deflection.
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 5. Typical Settings: 5. 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 :                   0.7 A +          * Magnet :                   0.2 - 1.4A 
-          * Heater: ​                    0.67 +          * Heater: ​                    0.58 
-          * Arc voltage:         150 V+          * Arc Voltage:         150 V
           * Filament Current: ​    70 - 90 amps           * Filament Current: ​    70 - 90 amps
           * Arc Current: ​            2.5 amps           * Arc Current: ​            2.5 amps
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           * 2Y:                          5.00           * 2Y:                          5.00
           * 2X:                          5.00           * 2X:                          5.00
-          *Box Vacuum: ​    ​2.0x10E<​sup>​-6</​sup> ​ torr+          * Box Vacuum: ​    ​2.0x10E<​sup>​-6</​sup> ​ torr
  
 ** Duoplasmatron Warm Shutdown Procedure ** ** Duoplasmatron Warm Shutdown Procedure **
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 4. Turn off the deflection supplies and run lenses down to zero. 4. Turn off the deflection supplies and run lenses down to zero.
  
-5. 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.+5. Turn down the source gas until the pressure on the source tc gauge is ~10 microns. ​ The pressure response is delayed, be patient. Do not over-drive the source gas control as it could damage the leak valve.
  
 ** Duoplasmatron Shut Down Completely ** ** Duoplasmatron Shut Down Completely **
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 5. Turn off the deflection supplies and run lenses down to zero. 5. Turn off the deflection supplies and run lenses down to zero.
  
-6. 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.+6. Turn down the source gas until the pressure on the source tc gauge is ~10 microns. The pressure response is delayed, be patient. Do not over-drive the source gas control as it could damage the leak valve.
  
 7. After 10 minutes to allow cooling water to circulate, turn control power key off on source control panel. 7. After 10 minutes to allow cooling water to circulate, turn control power key off on source control panel.
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 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. 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 the Filament Current and Arc Voltage to zero 
 + 
 +Turn down the source gas until the pressure on the source tc gauge is ~10 microns. The pressure response is delayed, be patient. Do not over-drive the source gas control as it could damage the leak valve.
  
 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. 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.
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 Close the manifold valve to the rough pump and turn off the pump. Close the manifold valve to the rough pump and turn off the pump.
  
-Open the 3He bottle main valve, regulator should go to ~ 5 psig.� Record the bottle pressure on the tag.+Open the 3He bottle main valve, regulator should go to ~ 5 psig. Record the bottle pressure on the tag.
  
-At the control console, turn up the source gas until the pressure on the source tc gauge is ~150 microns.� Flip the tag on the panel around to show 3He.+At the control console, turn up the source gas until the pressure on the source tc gauge is ~300 microns. Flip the tag on the panel around to show 3He.
  
 Reverse this procedure to return to 4He operation, except don’t rough beyond the 4He manifold valve (don’t rough line and regulator) when you have finished using 3He. Reverse this procedure to return to 4He operation, except don’t rough beyond the 4He manifold valve (don’t rough line and regulator) when you have finished using 3He.
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 Telephone: (740)593-0933 Telephone: (740)593-0933
 E-Mail: MASSEY@OHIOU.EDU E-Mail: MASSEY@OHIOU.EDU
-Last modified on 06/20/06 +Last modified on 3/16/2012 TNM
playground/alpha.txt · Last modified: 2012/11/27 08:57 by jacobs