Ion Pump Power Supplies - February 20, 2019
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Let's meet on Wednesday from 3-4pm in TL-1227 to discuss possible CEBAF injector vacuum upgrades.
- Overview
- Injector Upgrade - Gun through Quarter, maybe through FC2 gate is being rebuilt
- Timeline/Opportunities - SAD (Aug-Oct, 2019), Upgrade (May 6, 2020 ... for 6 months)
- Review Marcy/Daniel survey of injector IP power supplies media:190220_IP_Summary.xlsx
- Existing Power Supplies
- John's serial UHV work => unique design (low power 100uA, have interlock option, digital comm for readback, HV set, interlock limit?)
- Digitel supplies work => aging, poor resolution (high power mA, many ganged pumps, analog ADC readback, interlock limit boxes?)
- IP PS Upgrade Considerations
- Ion pumps
- Provide holding voltage with nA or uA curren
- Provide starting current of X uA?
- Independence (Adjust HV set on any IP, monitor current on any IP, interlock any IP)
- Still require some high power supplies available for bakes, activation, readback helpful, interlock probably not necessary
- Power supplies
- Gamma SPC => experience in rest of machine, nA resolution, EPICSs
- INC UHV => INC own/evolve design?, used at UITF, sub-nA resolution
- John's presentation info
- Why we did it media:why.pdf
- How we did it media:how.pdf
- Project Aurora media:aurora.pdf
- Technician safe HV. 5 Gigohm series impedance through 1000 ohm body is 1.4mA max at 7000V
- 5 GigOhm series impedance does very little to affect operation of an ion pump. 1uA draw is only a 5V drop across resistor. 100uA it drops 500V, so it is self-limiting
- For electrical safety class and mode descriptions
- https://www.jlab.org/ehs/ehsmanual/6230T1.htm#ClassModeDef