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--- strutture:lnf:da:btf:dispositivi:btf_diagnostic:faraday_cup [2022/07/11 15:12] – created foggetta@infn.it
+++ strutture:lnf:da:btf:dispositivi:btf_diagnostic:faraday_cup [2022/07/11 15:14] (current) – foggetta@infn.it
@@ Line 1: / Line 1: @@
+====== 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]