Accelerator Handbook

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playground:change

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playground:change [2012/02/06 20:19] – 50.41.34.104playground:change [2026/06/25 16:12] (current) – external edit 127.0.0.1
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 ==== Changing Terminal Energy ==== ==== Changing Terminal Energy ====
  
-1. Switch OVERVOLTAGE PROTECTION to DISABLE. +  - Put the Faraday cups in. 
- +  - Switch OVERVOLTAGE PROTECTION to DISABLE. 
-2. Switch the control mode to GVM. +  - Switch the control mode to GVM. 
- +  - Slowly turn the CONTROL GAIN to zero while watching the grid voltage.  If the grid voltage rises above -5 volts, reduce the CHARGING VOLTAGE to keep the grid voltage less than -5 volts, then continue reducing the CONTROL GAIN to zero. 
-3. Turn the CONTROL GAIN to zero. +  - To go to a higher energy move the CORONA PROBE POSITION "OUT" while raising the CHARGING VOLTAGE.  **__NEVER__** allow the GRID VOLTAGE to go more negative than -5 VDC during this operation. 
- +  - To go to a lower energy move the CORONA PROBE POSITION "IN" while lowering the CHARGING VOLTAGE.  **__NEVER__** allow the GRID VOLTAGE to go more negative than -5 VDC during this operation. 
-4. To go to a higher energy move the CORONA PROBE POSITION "OUT" while raising the CHARGING VOLTAGE.  **__NEVER__** allow the GRID VOLTAGE to go more negative than -10 VDC during this operation. +  - Set the TERMINAL VOLTAGE Dial to the desired value. The dial is 2 turns per MV (set the dial to twice the GVM you want). You may have to add some upcharge after setting the dial. 
- +  - Raise the CONTROL GAIN to 2-3 for low current beams, around 5 for high current beams. The system is now controlling in GVM mode. 
-5. To go to a lower energy move the CORONA PROBE POSITION "IN" while lowering the CHARGING VOLTAGE.  **__NEVER__** allow the GRID VOLTAGE to go more negative than -10 VDC during this operation. +  - Make fine adjustments to the TERMINAL VOLTAGE Dial to reach exactly the desired GVM value. 
- +  - Switch OVERVOLTAGE PROTECTION to ENABLE.
-6. Set the TERMINAL VOLTAGE Dial to the desired value. The dial is 2 turns per MV (set the dial to twice the GVM you want). You may have to add some upcharge after setting the dial. +
- +
-7. Turn the TERMINAL VOLTAGE dial to zero. +
  
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