strutture:lnf:da:btf:dispositivi:rivelatori:calorimeter:calobtf2
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| strutture:lnf:da:btf:dispositivi:rivelatori:calorimeter:calobtf2 [2022/12/21 16:18] – created foggetta@infn.it | strutture:lnf:da:btf:dispositivi:rivelatori:calorimeter:calobtf2 [2024/02/07 22:26] (current) – diociaiu@infn.it | ||
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| + | ======CALOBTF2====== | ||
| + | \\ | ||
| + | **Lead Glass -> Cherenkov**\\ | ||
| + | \\ | ||
| + | From the former OPAL electromagnetic calorimeter\\ | ||
| + | **Referred measuring System**\\ | ||
| + | Caen V965 - CH4 900pC (new Type)\\ | ||
| + | Caen N625 - CH2 @ -7mV bias\\ | ||
| + | |||
| + | |||
| + | \\ | ||
| + | **N=[239.7*(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 = 450 [MeV]\\ | ||
| + | \\ | ||
| + | |||
| + | **TABLE @ 450 MeV**\\ | ||
| + | **Last calibration @450MeV 20220505**\\ | ||
| + | |||
| + | ^ V ^ N ^ | ||
| + | | 1300 | 444.14 | ||
| + | | 1200 | 239.7 | | ||
| + | | 1100 | 122.6| | ||
| + | | 1000 | 58.83 | | ||
| + | | 900 | 26.122 | ||
| + | | 800 | 10.540 | ||
| + | | 700 | 3.768 | | ||
| + | | 600 | 1.1496 | ||
| + | | 500 | 0.28288 | | ||
| + | |||
| + | |||
| + | |||
| + | **Oscilloscope to Multiplicity calibration**\\ | ||
| + | To recover multiplicity by your own measurement system with our CALOBTF signal, follow these steps:\\ | ||
| + | * Usually we will refer our measurement with our QDC Caen V965 (new type, 900[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 CALOBTF 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. | ||
| + | * measure the integrated gate signal (GS) and removing pedestal value and get your signal (S) then [mV*ns/ | ||
| + | * Multiplicity (M) is this value normalized in our ADC scale value, divided by N , single particle value (see table on top for CALOBTF, voltage and beam energy dependant) | ||
| + | |||
| + | S=(GS-P)/ | ||
| + | M=(S/ | ||
| + | \\ | ||
| + | **CALO as BACKGROUND gamma detector for HIGH INTENSITY operation on N@BTF**\\ | ||
| + | We can use CALOBTF as background gamma detector to discover the upper limit of gamma to prevent the safety sistem to trips.\\ | ||
| + | We put CALOBTF 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\\ | ||
| + | |||