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playground:sputter [2012/02/15 10:06]
jacobs
playground:sputter [2017/03/20 09:51] (current)
jacobs
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 ** Cs Sputter Source Startup Procedure ** ** Cs Sputter Source Startup Procedure **
  
-Last modified on 2009 March 19, 15:20\\+
  
 ** General Considerations **  ** General Considerations ** 
  
   * Review these illustrations:​   * Review these illustrations:​
 +    * [[Cs_labeled|Cs Sputter Source Labeled Cutaway Diagram]] ​
     * [[cutaway|Cs Sputter Source Cutaway Diagram]]     * [[cutaway|Cs Sputter Source Cutaway Diagram]]
     * [[hvsupplies|Cs Sputter Source High Voltage Supplies]]     * [[hvsupplies|Cs Sputter Source High Voltage Supplies]]
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   - Check vacuum on LE extension, temperature gauge on cryopump should be at minimum value. ​   - Check vacuum on LE extension, temperature gauge on cryopump should be at minimum value. ​
   - Open source gate valve by pressing either button on gate valve control at source gate.   - Open source gate valve by pressing either button on gate valve control at source gate.
 +  - Set cesium reservoir controller temperature set point (green numbers): ​ 123C for ones of uAs, 130C for tens of uAs.
   - Remove grounding hook from power supply platform and hang on gate before closing. ​   - Remove grounding hook from power supply platform and hang on gate before closing. ​
   - Close both gates to source area.  Orange lights on Glassman supplies should come on at gate closing. ​ (If not, check other gate on the other side of the accelerator;​ both must be secured.) ​   - Close both gates to source area.  Orange lights on Glassman supplies should come on at gate closing. ​ (If not, check other gate on the other side of the accelerator;​ both must be secured.) ​
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   - Turn on and set the **Del main extractor** supply to the desired voltage for the particular buncher setting.   - Turn on and set the **Del main extractor** supply to the desired voltage for the particular buncher setting.
-  - Turn up the ionizer heater. ​  The ionizer operates at 21 amperes.  Keep in mind that the current will fall slightly as the ionizer gets warmer. ​ Keep adjusting the current until the ionizer is stable at 21 A. It should take about 2 minutes ​to reach 21 A from the standby value of 10 A.+  - Turn up the **ionizer** heater. ​  The ionizer operates at 21-22 amps.  Keep in mind that the current will fall slightly as the ionizer gets warmer. ​ Keep adjusting the current until the ionizer is stable at 21-22 A. It should take about 1 minute ​to reach 21 A from the standby value of 10 A.
   - Turn up the Cesium **feed tube** heater to 0.450 amperes.  ​   - Turn up the Cesium **feed tube** heater to 0.450 amperes.  ​
-  - Set the cesium **reservoir** heater to 0.275. This should be enough to give ones of microamps beam for p and d.    A setting of about 0.280 - 0.300 should produce tens of microamps. Cs vaporization starts at a temperature of ~80° Celsius. ​  The maximum reservoir temperature should not exceed 130° Celsius. The reservoir current should not exceed 0.300.+  - Set the cesium **reservoir** heater ​current ​to **0.315** Amps. This is an approximate value above the needed power level 
   - Set the Glassman **extractor** power supply to 12.5 KV. Check to be sure the current is less than about 5 milliamps and the "​control milliamperes"​ light is NOT lit. High current indicates that the source needs to be serviced.   - Set the Glassman **extractor** power supply to 12.5 KV. Check to be sure the current is less than about 5 milliamps and the "​control milliamperes"​ light is NOT lit. High current indicates that the source needs to be serviced.
-  - Set the Glassman **target** power supply to 6.5 kV. Check to be sure the current is less than about 5 milliamps and the "​control milliamperes"​ light is NOT lit. High current indicates that the source needs to be serviced.+  - Set the Glassman **target** power supply to 6.5 kV. Check to be sure the current is less than about 5 milliamps and the "​control milliamperes"​ light is NOT lit. High current indicates that the source needs to be serviced.  A newly installed pellet may cause instability for the first hour or so, but will become stable.
   - Set the Glassman **lens** power supply to 1.5 kV.   - Set the Glassman **lens** power supply to 1.5 kV.
   - **Tune the beam with the inflection magnet, source lens (usually about 1.5 kV), einzel lens A, and 2Y steerer.** ​ The 2X steerer should be neutral (5.00 on dial) as X steering is be done by the inflection magnet at this stage.   - **Tune the beam with the inflection magnet, source lens (usually about 1.5 kV), einzel lens A, and 2Y steerer.** ​ The 2X steerer should be neutral (5.00 on dial) as X steering is be done by the inflection magnet at this stage.
-  - Monitor the target and extractor currents: target current should be around 2.5 milliamps, and no more than 5 mA.+  - Monitor the target and extractor currents: target current should be around 2.5 milliamps, and no more than 5 mA.  If target current gets too high, reduce the cesium reservoir setting.
  
 ** Out-gassing the source after cleaning ** ** Out-gassing the source after cleaning **
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 ** Shut Down Procedure ** ** Shut Down Procedure **
  
-  - Turn down the cesium ​reservoir ​heater ​power supply.  ​Off is about 0.070 A+  - **Cesium ​reservoir**: The reservoir has a temperature controller that turns the power on/off as needed for a constant temperature.  ​The controller ​is located next to the analog temperature meter on the source power platform. ​ The red numbers are the measured temperature,​ the green numbers are the set point temperature,​ there is a small red light that indicates when the controller is calling for power. ​ The reservoir current switches between ​0.150A and .315A as directed by the controller. 
-  - Wait for the reservoir temperature to drop below 80° C.  ​+  - Wait until the reservoir controller'​s red power light is on and you can see about .315A reservoir current on the meter, run the reservoir current down on the digital meter. ​ Make sure that you see controller red light on with minimal amps of current
 +  - Wait for the reservoir temperature ​(red numbers on controller) ​to drop below** 85**° ​C.  ​
   - Turn down the feed tube power supply.   - Turn down the feed tube power supply.
   - Wait for the feed tube temperature to drop below 80° C.   - Wait for the feed tube temperature to drop below 80° C.
playground/sputter.1329318418.txt.gz · Last modified: 2012/02/15 10:06 by jacobs