strutture:lnf:da:btf:dispositivi:btf_diagnostic:faraday_cup
Faraday Cup
Adone Faraday cup
dimensions
copper shielding
Current to charge conversion with QDC Caen V965:
After having performed a pedestal subtracion, the ADC value is converted to charge with this formula:
ADC(pede sub)/4095*FS(ch)= Q [pC]
where:
- ADC(pede sub) = pedestal subtracted ADC value
- FS(ch)= range in [pC] of the selected dual range channel (100pC or 900pC, new version of V965)
- Q is the charge expressed in pC
Current to charge conversion with One electron:
Put on peak the value of
- 6.006 for 900pC
- 54.054 for 100pC
and validate,
the #ele control will measure the value of total integrated charge in unit of 10^7 electrons
Current to charge conversion with oscilloscope:
- - Integrated Charge with measure reference bars (measure outputted by scope)= C [pV*s]
- - Pedestal = F[pV*s] (same as signal measure, triggered with DHSTB001 in stby mode)
- - Internal resistance = R[Ohm]
- - Bergoz monitor calibration ⇒ Q(beam)/Q(out) @ 50 Ohm
- - Bunch pulse width = dt [ns]
Formula to obtain iduced charge on WCM via scope:
Q[pC]=[(C-F)/R]
Formula to obtain mean current from single bunches (To be compared with LINAC WCMTM001 in order to measure transport efficiency):
I[mA]= { (C[pVs]-F[pVs]) /50[Ohm]}/dt[ns]
strutture/lnf/da/btf/dispositivi/btf_diagnostic/faraday_cup.txt · Last modified: 2022/07/11 15:14 by foggetta@infn.it