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playground:sputter [2017/03/06 15:40]
jacobs
playground:sputter [2021/03/22 10:17]
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.
-  - Set cesium reservoir controller temperature set point (green numbers):  ​123C for ones of uAs, 130C for tens of uAs.+  - Set cesium reservoir controller temperature set point (green numbers):  ​117C for ones of uAs, 120C 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 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 **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 current to 0.400 Amps. This is an approximate value above the needed power level.  ​You may use the digital or analog meter to set this value.+  - 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. ​ 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.
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 ** Shut Down Procedure ** ** Shut Down Procedure **
  
-  - **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 and .400A 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 .400A reservoir current on one of the meters, run the reservoir current ​to zero on either ​the digital ​or analog meters.  Make sure that you see controller red light on with zero 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.  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.txt · Last modified: 2021/03/22 11:04 by carter