Study of HF pmt high tail signal • FNAL: Jim F, Rick Vidal • Iowa: Ugur Akgun, Asli Albayrak, Warren Clarida, Antony Moeller, Yasar Onel, Justin Parsons, Taylan Yetkin • Princeton: Valeri Halyo, Adam Hunt • Thanks to Ren Yuan Zhu for getting the crystals BGO , LYSO (Shanghai Institute of Ceramics)
Study of HF pmt high tail signal. FNAL: Jim F, Rick Vidal Iowa: Ugur Akgun, Asli Albayrak , Warren Clarida, Antony Moeller , Yasar Onel, Justin Parsons, Taylan Yetkin Princeton: Valeri Halyo, Adam Hunt - PowerPoint PPT Presentation
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Study of HF pmt high tail signal
• FNAL: Jim F, Rick Vidal• Iowa: Ugur Akgun, Asli Albayrak, Warren
n.b. this is what you expect for good signal separation
Fe, No Crystal
n.b. external gain = 100X, bad peds
+0+64+32
+96 +128 +160
Fe, BGO Crystal
n.b. external gain = 10X
Fe, LYSO Crystal
n.b. external gain = 1X. Also note pedestal (= ADC gate?) problem
LYSO, FE, no delay
BGO, FE, no delay
Conclusions
• Tail is due to cerenkov light in window• Can tag by use of scint disk ~100% efficient• LYSO 1mm too thick, at least 10X too much light.
Looking at 0.1mm– (cost 0.1mm = $35, 0.15mm = $23, 0.2mm =$18 , SIC)– Maybe reduce the cerium content to reduce light yield
• BGO Looks good (except for long time constant)• Other possibilities like Li-glass• Will need to get prototypes and bench test• Will propose to instrument some channels for summer