WCM
OUTSIDE BTF LINE
Two WCM are placed before the pulsed magnet (WCMTM01) and after SLTB001 (WCMTB01)
One WCM is installed at the end of the DHSTB002 dipole straight line (WCMTB02).
BERGOZ ICT 122-070-05-1
Bergoz site Link
Manual
Current to charge conversion with QDC:
After having performed a pedestal subtraction, the ADC value is converted to charge with this formula:
ADC(pede sub)/4095*FS(ch)*G= 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
- G=10(WCM btf), 20(WCM linac)
Current to charge conversion with One electron:
Put on peak the value of
- 0.819 for a 800pC
- 0.728 for 900pC
- 6.552 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 = g = 10(btf) 20(linac)
- - Bunch pulse width = dt [ns]
Formula to obtain induced charge on WCM via scope:
Q[pC]=g*[(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]= { g*(C[pVs]-F[pVs]) /50[Ohm]}/dt[ns]
Measure 20131213 on WCMTB002 (straight line) with pedestal subtracted (201312101258.ped) of value (63.02/2.17)(484.41/16.76)