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R. De Leo [1] , M. Mastromarco [1] , R. Perrino [2] [1] Universit à e INFN Bari [2] INFN Lecce

TOPEM Meetings Catania, 1.12.2010. Misure di temporizzazione con LYSO e PMT Burle 8850 Roma, 10.05.2010 PMT R9880U-110 sba Catania, 1.12.2010. R. De Leo [1] , M. Mastromarco [1] , R. Perrino [2] [1] Universit à e INFN Bari [2] INFN Lecce. COPPIE FOTOTUBI DISPONIBILI.

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R. De Leo [1] , M. Mastromarco [1] , R. Perrino [2] [1] Universit à e INFN Bari [2] INFN Lecce

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  1. TOPEM Meetings Catania, 1.12.2010 Misureditemporizzazione con LYSO e PMT Burle 8850 Roma, 10.05.2010 PMT R9880U-110 sbaCatania, 1.12.2010 R. De Leo[1], M. Mastromarco[1], R. Perrino[2] [1]Università e INFN Bari [2]INFN Lecce

  2. COPPIE FOTOTUBI DISPONIBILI R9880U-110 - sba / R7600U-200 - uba CRISTALLI DISPONIBILI LYSO dim. [mm] 1 pezzo 10 x 10 x 10 (Burle 8850) 2 pezzi 5 x 3 x 3 (R9880U-110)

  3. Outline Set-up sperimentale Spettri di carica e carica-tempo Confronto fra varie sorgenti di calibrazione Calibrazione in energia Risoluzione in energia Risoluzione in tempo TOPEM Meeting Roma, 10.05.2010

  4. Set-up sperimentale FIFO dB attenuator + delay CFD Ortec935 delay Linear input GATE PMT 8850 Charge ADC gamma source STOP Linear input LYSO 10x10x10 mm3 LYSO 10x10x10 & Burle 8850 Gate generator Coincidence unit TDC 25 ps/chan START PMT 8850 STOP CFD Ortec935 delay FIFO dB attenuator + delay NIM CAMAC Data Storage

  5. 1275 KeV Scatter plot ADC-left versus ADC-right 511 KeV Na22

  6. Scatter plot ADC-left versus ADC-right 662 KeV 1333 KeV 1173 KeV Cs137 Co60

  7. Sommario varie sorgenti (ADC L+R) Na22 Cs137 Co60 Internal radioactivity

  8. Analisi in energia Estrazione parametri da picchi di calibrazione: centroide e sigma per stima risoluzione energia 511 keV 1275 keV /E= 2 % /E= 5 % Na22

  9. Analisi energia Cs137 e Co60 /E= 5 % /E= 2 % 662 keV 1173, 1333 keV Cs137 Co60

  10. Risoluzione in energia Stima del numero dei fotoelettroni E/E = enf/sqrt(NPE) enf=1.2 E/E NPE

  11. Cs137 Na22 Co60 1173 KeV 1275 KeV 1333 KeV 662 KeV 511 KeV TDC spectrum TDC spectrum TDC spectrum CFD adjusted to minimize time-charge effects

  12. Time resolution vs. energy Contributi baseline nostro set-up: A = lyso⊕elx⊕ 2 pmt t = A ⊕ B/E1/2 lyso~100 ps /√Npe/ √12 elx ~ 25 ps 2 pmtè predominante Burle8850 RT=2.1 ns TT=31 ns baseline A = 233 ps source energy half seen by each PMT

  13. PMT vedono ~1/2 luce prodotta in fotopicco 511KeV. Nuove misure in set-up modificato + PMT più veloci e con minor TTS Vecchia MISURA Burle8850 RT=2.1 ns TT=31 ns TTS=? LYSO 10 x 10 x 10 mm3 ~ 2000 PE/MeV PMT vedono entrambi tutta la luce prodotta in fotopicco 511 KeV. R9880U-110 RT=0.57 ns, TT=2.7 ns 2 x LYSO 3 x 3 x 5 mm3 Nuova MISURA

  14. Set-up sperimentale Fast Ampl. x10 dB attenuator + delay LE delay Linear input GATE PMT Charge ADC gamma source STOP Linear input LYSO 3x3x5 mm3 Gate generator Coincidence unit TDC 25 ps/chan START STOP PMT LE delay Set-up sperimentale dB attenuator + delay FastAmpl.x10 NIM CAMAC Data Storage

  15. = 4.9 ch = 122 ps • FWHM = 288 ps

  16. Internal radioactivity 2 crystals in coincidence with no source

  17. Internal radioactivity: 3 gamma lines and a beta spectrum Misure CT sum of the 3 gamma lines 22 Na source

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