SiPM+NINO as a detection system for CEDAR François POWOLNY Pierre JARRON Julie GUIZIEN

CEDAR project Cerenkov light detection λ = 300 – 400 nm freq = 2 MHz / mm2 SiPM 1x1 mm2 from : FBK (INFN) Hamamatsu ST Microelectronics CEDAR F. POWOLNY 29 / 07 / 2009

SiPM principle SiPM signal is a pile up of SPAD signals Binary detector For synchronous photons: SPAD i(t) 90mA 60mA 30mA t CEDAR F. POWOLNY 29 / 07 / 2009

Experimental setup Keithley 2410 33V i+ (t) SiPM i- (t) + - 50 Ω Keithley 2410 33V 50 Ω Laser Pulse : 50 ps 1 to 5 photons Delay + Pulse Height 10 nF 50 Ω i+ (t) SiPM + FILTER FILTER - 20 Ω i- (t) 50 Ω CEDAR F. POWOLNY 29 / 07 / 2009

Reverse I(V) Current (A) VBD = 33.5 V  Vbias = 36.5 V Voltage (V) Hamamatsu FBK STM VBD 69 V 33.5 V 30 V Current (A) VBD = 33.5 V  Vbias = 36.5 V Voltage (V) CEDAR F. POWOLNY 29 / 07 / 2009

Forward I(V) RQ/Ncell = dV/dI = 11.06 kΩ Ncell = 576 RQ = 6.3 MΩ Current (A) Ham. FBK STM Ncell 100 576 400 RQ W 1.3 M 6.3 M 1.6 M Forward bias (V) CEDAR F. POWOLNY 29 / 07 / 2009

Signal shape FBK Fast Component: 1.5 ns Slow Component: 54 ns   Ham. FBK STM fast 2.5 ns 1.5 ns slow 100 ns 54 ns recharging - 500 ns CEDAR F. POWOLNY 29 / 07 / 2009

Signal pulse height HAMAMATSU FBK STM Pulse height [mA] No. of Counts 1 Phot FBK No. of Counts 1 Phot STM 1 Phot CEDAR F. POWOLNY 29 / 07 / 2009

Time resolution measurement SiPM alone

Setup schematic Laser Pulse : 50 ps 1 to 5 photons CEDAR SiPM delay Pulse height CEDAR F. POWOLNY 29 / 07 / 2009

Scatter plot Delay(ns) Pulse height (mV) Hamamatsu Events corelated to the laser Delay(ns) noise Pulse height (mV) No. of Counts Timing measurements Hamamatsu 1 x 1 Vbias = 69.5V – (VBD = 69V) No. of Counts 1 photon detected region CEDAR F. POWOLNY 29 / 07 / 2009

Zoom on the most populated area Hamamatsu Delay(ns) Pulse height (mV) No. of Counts Selection of the events corresponding to the detection of 1 photon… Timing measurements Hamamatsu 1 x 1 Vbias = 69.5V – (VBD = 69V) No. of Counts CEDAR F. POWOLNY 29 / 07 / 2009

Time resolution No. of Counts Delay(ns) Hamamatsu f(x) = a1*exp(-((x-b1)/c1)^2) a1 = 505.8 b1 = -19.66 c1 =0.3772 … and fit of the corresponding delay distribution No. of Counts σ = 267 ps Timing measurements Hamamatsu 1 x 1 Vbias = 69.5V VBD = 69V Delay(ns) CEDAR F. POWOLNY 29 / 07 / 2009

Time resolution measurement Input of Nino t SiPM + NINO f = 20 MHz Nino threshold I (t) V (t) Time walk Time walk a pulse width Output of Nino t

Setup schematic + - Laser Pulse : 50 ps 1 to 5 photons 20 MHz CEDAR delay Pulse width + FILTER FILTER - 20 Ω CEDAR F. POWOLNY 29 / 07 / 2009

SiPM + NINO @ 20 MHz Delay(ns) Pulse Width (ns) Timing measurements STM Delay(ns) Pulse Width (ns) No. of Counts Timing measurements STM 1x1 – VBD = 30.4 V Vbias = 34 V NINO TH = 100 mV Freq: 20 MHz No. of Counts CEDAR F. POWOLNY 29 / 07 / 2009

Zoom on the most populated area 1 detected photon region Delay(ns) Pulse Width (ns) No. of Counts STM Timing measurements ST 1x1 – VBD = 30.4 V Vbias = 34 V NINO TH = 100 mV Freq: 20 MHz No. of Counts CEDAR F. POWOLNY 29 / 07 / 2009

Time walk correction STM CEDAR F. POWOLNY 29 / 07 / 2009

No. of Counts σ = 172 ps Delay(ns) STM f(x) = a1*exp(-((x-b1)/c1)^2) CEDAR F. POWOLNY 29 / 07 / 2009

Overview of the results Time resolution (s) on the detection of a single 405 nm photon STM 1x1 mm2 FBK Hamamatsu SiPM alone 180 ps 300 ps 250 ps SiPM + NINO After TWC @ 1 MHz   450 ps preliminary 480 ps @ 20 MHz 170 ps not done  not done CEDAR F. POWOLNY 29 / 07 / 2009

Thank you for your attention

Experimental setup Keithley 2410 33V i+ (t) SiPM i- (t) 50 Ω 50 Ω Keithley 2410 33V Delay + Pulse Height 10 nF U = i+ (t) * 3e-3 Laser Pulse : 50 ps 1 to 5 photons 50 Ω i+ (t) SiPM FILTER 20 Ω i- (t) 50 Ω CEDAR F. POWOLNY 29 / 07 / 2009

NINO principle CEDAR F. POWOLNY 29 / 07 / 2009