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--- strutture:lnf:da:btf:dispositivi:rivelatori:calorimeter:cherenkov [2022/05/16 08:11] – foggetta@infn.it
+++ strutture:lnf:da:btf:dispositivi:rivelatori:calorimeter:cherenkov [2022/12/21 16:19] (current) – foggetta@infn.it
@@ Line 1: / Line 1: @@
+======CALOBTF1======
+\\
+**Lead Glass -> Cherenkov**\\
+\\
+From the former OPAL electromagnetic calorimeter\\
+**Referred measuring System**\\
+Caen V965 - CH4 900pC (old Type)\\
+Caen N625 - CH2 @ -7mV bias\\
+\\
+**N=184.85*(x)^7.705*Ebeam\E0** \\
+N = single particle value [adc unit, pedestal subtracted]\\
+x = V/1200 [V]\\
+V= Voltage on CALO (Minimum Voltage 450V)\\
+Ebeam = Energy beam [MeV]\\
+E0 = 447 [MeV]\\
+\\
+**TABLE @ 447 MeV**\\
+**Last calibration @450MeV 20220505**\\
+^ V     ^ N       ^ lastcal N m=1  ^ sigma lastcal  ^
+| 1300  | 360.9   | 350.6          | 41.8           |
+| 1200  | 186.75  | 188            | 22.2           |
+| 1100  | 92.51   | 96.1           | 11,4           |
+| 1000  | 42.54   | 45.3           | 5.6            |
+| 900   | 18.03   | 19.6           | 2.58           |
+| 800   | 6.903   | 8.23                           ||
+| 700   | 2.325   | 2.78                           ||
+| 600   | 0.662   | 0.84                           ||
+| 500   | 0.1507  | 0.216                          ||
+| 450            || 0.092                          ||
+| 400   |         | 0.0415         |                |
+**Oscilloscope to Multiplicity calibration**\\
+To recover multiplicity by your own measurement system with our CALOBTF1 signal, follow these steps:\\
+  * Usually we will refer our measurement with our QDC Caen V965 (old Type, 800[pC] full scale in 12bit, output is in ADC values)
+  * acquire the signal in time domain
+  * give an integration time about 200[ns], centred on Beam signal (typically CALOBTF1 signal Tr=8[ns], Tf=20[ns]) to pick up best baseline
+  * measure integrate pedestal without beam signal (P). Oscilloscope will give you values in [V*s], to get value in [pC], divide by your input impedance.  Usually P=70/4096x900 [adc/adc*pC] = 13.7 [pC]
+  * measure the integrated gate signal (GS) and removing pedestal value and get your signal (S) then [mV*ns/Ohm]=[pC]
+  * Multiplicity (M) is this value normalized in our ADC scale value, divided by N , single particle value (see table on top for CALOBTF1, voltage and beam energy dependant)
+S=(GS-P)/(50)= [V*s/Ohm]\\
+M=S/900E-12*4096/N = [C*ADC/C/ADC] \\
+\\
+**CALO as BACKGROUND gamma detector for HIGH INTENSITY operation on N@BTF**\\
+We can use CALOBTF1 as background gamma detector to discover the upper limit of gamma to prevent the safety sistem to trips.\\
+We put CALOBTF1 in the bent middle line at 3.8 meters from exit bent pipe with 500V supply\\
+Normal operation means up to 20mV peak to peak signal, if above the safety trips\\