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playground:sputter [2020/08/18 14:48]
jacobs
playground:sputter [2021/03/22 11:04] (current)
carter
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   - Ensure that desired beam target is loaded.   - Ensure that desired beam target is loaded.
-  - Set buncher ​tubes to correct configuration for desired beam species.+  - Set buncher ​tube selector switch ​to correct configuration for desired beam species.  Only rotate the switch clockwise. ​ This switch is a large high voltage rotary switch and the proper position aligns the position number in the center of the arrow marker The position between numbers fells like a detent but is actually the switch wiper falling between the contacts. ​ Do not have the switch in an apparent detent position. ​ Move the switch to the middle of the friction range with the number properly aligned with the arrow marker.
   - 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.
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   - 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 **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.  Make sure the inflection magnet deflection is set to "​Right"​.
   - 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.   - 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.
  
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   - **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.   - **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 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 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 until it stops.  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.  ​   - 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.
playground/sputter.1597776535.txt.gz · Last modified: 2020/08/18 14:48 by jacobs