Difference between revisions of "Ion Pump Power Supplies - February 20, 2019"

Revision as of 14:53, 20 February 2019

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. 5G ohm series impedance through 1000 ohm body is 1.4mA max at 7000V
5G series impedance does very little to affect operation of an ion pump. 1uA draw is only a 5V drop across resistor.

@@ Line 24: / Line 24: @@
 : How we did it [[media:how.pdf]]
 : Project Aurora [[media:aurora.pdf]]
+; Technician safe HV.  5G ohm series impedance through 1000 ohm body is 1.4mA max at 7000V
+; 5G series impedance does very little to affect operation of an ion pump.  1uA draw is only a 5V drop across resistor.