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sputter:pellet [2011/08/17 09:35] – Split some steps so each action is a numbered step, fixed some spelling and grammar, added some additonal detail /JEO 132.235.40.233sputter:pellet [2026/06/25 16:12] (current) – external edit 127.0.0.1
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 ====== Cesium Sputter Source Target Change ====== ====== Cesium Sputter Source Target Change ======
-===== (Revised 4/15/2009; Rev. 17 Aug 2011) =====+===== (Revised 7/22/2020) =====
  
  
    - Obtain proper target.  Wear clean gloves when handling target and target holder. Determine if target is new or used. Used will have a blackened and scared tip.    - Obtain proper target.  Wear clean gloves when handling target and target holder. Determine if target is new or used. Used will have a blackened and scared tip.
 +   - Also, determine the proper Buncher Tube setting if you are changing beam species.  This will be your only chance to set it.
    - Turn off DEL HIGH VOLTAGE POWER SUPPLY  (Main Extractor Power)     - Turn off DEL HIGH VOLTAGE POWER SUPPLY  (Main Extractor Power) 
    - Record present value and decrease Cesium Reservoir Current by 50%, usually to about 0.125 amp.    - Record present value and decrease Cesium Reservoir Current by 50%, usually to about 0.125 amp.
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    - Decrease Extractor Voltage to zero.    - Decrease Extractor Voltage to zero.
    - At gate in vault, open gate - the orange lights on the Glassman supplies should go off.  If not, stop and get help.    - At gate in vault, open gate - the orange lights on the Glassman supplies should go off.  If not, stop and get help.
-   - Hang large ground hook at red arrow on power platform. +   - Hang large ground hook at red arrow on power platform.  Go around to the other gate and ground the Alpha source.
-   - At the source, hang small ground hook on the target plane of source head.+
    - Close gate valve between source and inflection magnet. Controller on source base below gate valve.    - Close gate valve between source and inflection magnet. Controller on source base below gate valve.
    - Check that the source box Ion gauge is on and controller display can be seen from the source head area.  You will need to see the pressure in the source box during later steps.  You may have to rotate the controller to see it from the source.    - Check that the source box Ion gauge is on and controller display can be seen from the source head area.  You will need to see the pressure in the source box during later steps.  You may have to rotate the controller to see it from the source.
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    - Close hand gate valve by pushing down on the black knob firmly.  You should hear or feel a click at the bottom of the motion.    - Close hand gate valve by pushing down on the black knob firmly.  You should hear or feel a click at the bottom of the motion.
    - Open the small green roughing valve (on plastic hose) at the target air lock to vent the target area.     - Open the small green roughing valve (on plastic hose) at the target air lock to vent the target area. 
-   - (Wear gloves) Loosen the silver O-ring collar and slowly remove target holder. +   - (Wear gloves) Completely unscrew the silver O-ring collar and slowly remove target holder. O-ring should come out with target holder.
    - (Wear gloves) Remove the used target.  Wrap the used pellet in a small Kimwipe and store in appropriate container.    - (Wear gloves) Remove the used target.  Wrap the used pellet in a small Kimwipe and store in appropriate container.
    - (wear gloves) Install new target; thread on finger tight (Al foil is no longer used).     - (wear gloves) Install new target; thread on finger tight (Al foil is no longer used). 
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    - Close the small valve labeled “VAC’M” on the left side of the source.      - Close the small valve labeled “VAC’M” on the left side of the source.  
    - Open the small valve labeled “VENT”  to vent the roughing line.    - Open the small valve labeled “VENT”  to vent the roughing line.
-   - Remove the small ground hook from the source head. 
    - Open gate valve between source and inflection magnet.    - Open gate valve between source and inflection magnet.
-   - Remove large ground hook from power platform and close gate.  The orange lights on Glassman power supplies should light up, if not, try pushing the boost button on the wall.   If this still does not make the lights come on, wait a few minutes and try again (leave gate open while waiting to let the actuator cool). +   - Unground the Alpha source and close the gate on that side of the room. 
-   - Use long Plexiglas rod to push the two High Voltage ON buttons located on the top two Glassman Power Supplies.+   - Remove large ground hook from power platform, hang on the gate, and close the gate.  The orange lights on Glassman power supplies should light up, if not, try pushing the boost button on the wall.   If this still does not make the lights come on, wait a few minutes and try again (leave gate open while waiting to let the actuator cool). 
 +   - Press the doorbell button on top the Pelletron AC Power Center. The Extractor and Target Glassman supplies should indicate Voltage Control with red lights.
    - In control room, turn on Del Main Extractor supply to the previous value.    - In control room, turn on Del Main Extractor supply to the previous value.
    - Return ionizer to 21 A.    - Return ionizer to 21 A.
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    - Return the Cesium reservoir to the previous value.    - Return the Cesium reservoir to the previous value.
  
-====  Two hours should produce beam with a previously used pellet.   New pellets may take longer. ====+====  Two hours should produce beam with a previously used pellet.   New pellets may take 8 hours or longer. ====
  
  
  
sputter/pellet.1313588121.txt.gz · Last modified: (external edit)