Efficiency, Dark noise, and Baseline fluctuations with Burle-Photonis MCP-PMT's Jean-Francois Genat and Edward May Dec 2009 –Jan 2010.

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Presentation transcript:

Efficiency, Dark noise, and Baseline fluctuations with Burle-Photonis MCP-PMT's Jean-Francois Genat and Edward May Dec 2009 –Jan 2010

MCP Signal development Fast rise-time: thin 2d gap, low LC parasitics Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010 MCP signal rising edge: qE = ma l = 1mm, E=100V/mm, tr=250ps Slown down by: RC= 50 . 5pF = 250ps

MCP Signal development Fast rise-time: thin 2d gap, low RLC elements Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010 MCP signal rising edge: qE = ma Example: l = 1mm, E=200V/mm, tr=250ps Effect of passive elements: C=capacitance of the detector R=50  C R Inductance to the ground return V(t)

MCP Signal development Rise time is RC dependent at the first order Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010 First order model: I 0 (t) C R I 1 (t)

10 and 25  m 2” x 2” Burle-Photonis MCP tested - 25  m MCP HV: kV Signals taken on one anode pad, all other pads grounded: - 10  m MCP HV: kV Signals taken on one anode pad, all other pads grounded: Use Ed May’s calibrated laser test setup at Argonne - 408nm light set at 100 Photo-Electrons - TDS 6154C 18GHz bandwidth from Tektronix Experimental conditions Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010

408nm 70ps laser 100 Photo-Electrons Cable bandwidth: 3.5 GHz Conclusions: - Gain is 40mV/100 = 0.4mV/PE (25  m) at 2100 V 5mV/100 = 50  V/PE (10  m) at 2500V - 10  m somewhat faster rise time, longer trailing edge, presumably due to 4 pads connected together. - The rise time does NOT depend upon the amplitude Measured Signals Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010

Impulse dark noise vs HV Conclusion: At full efficiency (25  m 2000V, 10  m 2500V), dark counts rates are: 25Hz (25  m) 80Hz (10  m) Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010

MCPs Efficiency and Baseline noise Efficiency plateau and baseline noise (left: 25  m, right 10  m) Plateaux are 300V wide for both MCPs Baseline rms below 1 mV rms (system noise), no dependence with the High Voltage 10  m MCP showed double and triple after-pulses (not included in the count rates) Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010 ORTEC 9327 CFD

Conclusions MCP PMTs show efficiency plateaux, baseline fluctuations and dark counts better than the best Photo-multiplier tubes With: - Faster signals (device is thinner, consequently, a better timing resolution) rise-time ps (1ns PMTs) - Less noise compared to “good” PM Tubes: dark counts ( Hz PMTs) Jean-Francois Genat, Large Area Picosecond Photo-Detectors Electronics, Clermont-Ferrand, January 28 th 2010