User Tools

Site Tools


playground:sputter

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Last revision Both sides next revision
playground:sputter [2015/09/02 08:24]
jacobs
playground:sputter [2017/03/06 15:40]
jacobs
Line 20: Line 20:
   - 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.) ​
Line 28: Line 29:
   - 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 to 0.260. This should be enough ​to give ones of microamps beam for p and d.    A setting of about 0.270 - 0.275 should produce tens of microamps. The reservoir current should not exceed 0.280.+  - 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 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.
Line 51: Line 52:
 ** 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 ​and .400A 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 .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 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.txt · Last modified: 2017/03/20 09:51 by jacobs