Dec 22 2006LED monitoring system Beam-test LED monitor Ｊａｎ /23/200 ７ K.Toyama, H.Ono Niigata University, MSU-IIT GLD-CAL.

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Presentation transcript:

Dec LED monitoring system Beam-test LED monitor Ｊａｎ /23/200 ７ K.Toyama, H.Ono Niigata University, MSU-IIT GLD-CAL

Dec LED monitoring system Setup of Y-strip 45mm 90mm 10mm 90mm FFC MPPC FPCB 24.7mm FPCB 24.7mm

Dec LED monitoring system Setup of X-strip 90mm MPPC FFC FPCB 10mm

Dec LED monitoring system FFC connector board Y-Strip X-Strip Tungsten 3.5mm FFC

Dec LED monitoring system ECAL assembly LED flush through the white PET sheet. Need to make a small hole on the black sheet ． Black sheet White PET Mega strip LED with FFC

Dec LED monitoring system Bench test setup ＰＭＴＡＤＣ３ｃｍ 2mm thickness scintillator LED light pass through the white PET sheet. WLSF White PET LED

Dec LED monitoring system Bias voltage vs light yield (ADC)

Dec LED monitoring system We can see light yield through sheet 2/3 Light yield reduce by white PET sheet. We can see linearity of bias voltage vs light yield through white PET sheet ADC spec : 0.25pc/count

Dec LED monitoring system Now Doing Measure how many LEDs can drive by TTL one signal.

Dec LED monitoring system Problem We planned that thirteen LEDs connect in parallel by NIM-TTL one signal. When we use many LED in parallel, the bias from NIM-TTL module become low. TTL In 5V,25ns Measure by probe

Dec LED monitoring system Oscilloscope picture from probe 1 No LEDOne LED X axis scale 25ns Y axis scale 500mV Probe makes 1/10V

Dec LED monitoring system Oscilloscope picture from probe 2 three LEDsfour LEDs X axis scale 25ns Y axis scale 500mV Probe makes 1/10V

Dec LED monitoring system Three LEDs connected in parallel When we connect three LEDs in parallel, light yield slightly decreased. We didn’t use FFC and MPPC in this time. We used general cable and PMT. LED yield Event frequency

Dec LED monitoring system Four LEDs connected in parallel When we connect four LEDs,we cannot see light yield peak. Pedestal and light yield are almost equal. Event frequency LED yield

Dec LED monitoring system Summery and Next We should consider how to drive LEDs, –TTL pulse width should be a little wider? –Reduce LEDs on one board, one TTL drive pulse? Test by MPPC. We already receive all the parts expect for LEDs. It takes only a few days to assemble them.