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Multi Pixel Photon Counters (MPPC) and Scintillating Fibers (Sci-Fi) as a trigger system for the AMADEUS experiment Alessandro Scordo (L.N.F.) (in behalf.

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Presentation on theme: "Multi Pixel Photon Counters (MPPC) and Scintillating Fibers (Sci-Fi) as a trigger system for the AMADEUS experiment Alessandro Scordo (L.N.F.) (in behalf."— Presentation transcript:

1 Multi Pixel Photon Counters (MPPC) and Scintillating Fibers (Sci-Fi) as a trigger system for the AMADEUS experiment Alessandro Scordo (L.N.F.) (in behalf of AMADEUS experiment) 23° Indian-Summer School of Physics & 6° HADES Summer School 2011

2 The AMADEUS experiment: a brief introduction Trigger system requirements MPPC working principle and status of art 10 channels prototype and MPPC characterization Results of tests on DA  New electronics and 64 channels prototype Tests on hadronic beam Conclusions Contents

3 DAΦNE KLOE The AMADEUS experiment: a brief introduction - The main aim of AMADEUS is to confirm or deny the existance of Kaonic Clusters, - EXTENDED PROGRAM: Low- energy interactions, cross sections in light nuclei, decay of resonance states and exotic channels in nuclear medium will be studied

4 The AMADEUS experiment: a brief introduction Deeply Bound Kaonic Nuclear States First suggested by S.Wycech (1986) Y.Akaishi and T. Yamazaki (Phys. Rev. C65 (2002) ) “Nuclear bound states in light nuclei” Normal Nuclear binding energy parameters: E bind ~ 20 MeV  ~ 100 MeV DBKNS binding energy parameters: E bind ~ 100 MeV  ~ 30 MeV K He reaction (3-barionic state) New kind of matter with astrophysical implications (Neutron stars, prof. Heuser talk)

5 The AMADEUS experiment: a brief introduction

6 Target: A gaseous He target for a first phase of study First 4  fully dedicated setup! The AMADEUS experiment: a brief introduction

7

8 Trigger system requirements Multi Pixel Photon Counters (MPPC) 1) Small dimensions 2) Working in magnetic field 3) Working at room temperature 4) Very good time resolution (  ~ 300 ps) 5) High efficiency

9 MPPC : working principle P-N junction array working in Geiger mode (micropixel) Output signal is the sum of all the micropixels Each micropixel gives a high gain signal (10 5 – 10 6 ) indipendent of the number of incident photons and has a fixed amplitude (binary mode)

10 First prototype and MPPC characterization Is cooling needed ? A scintillating fiber is activated by a beta Sr90 source Both ends are coupled to detectors; one is used as trigger

11 First prototype and MPPC characterization Studying rates with and without the beta source, it turned out that starting from the 4 th p.e. peak, dark count contribute is negligible This means that non cooling is needed in this case!!!!

12 Montecarlo simulations: what are we expecting? Momentum distribution of kaons is taken from Kloe Monte Carlo BCF-10 1mm diameter Kaons are expected to leave almost a factor 7 more energy than MIP electrons GEANT3 simulation

13 22-24 January 2009 Results of tests on DAФNE

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15 MIPs coming from the I.P. are below the KM threshold KM scintillator at 6 cm from Interaction Point Fibers 5 cm below the lowest scintillator RF/2 and KM coincidence as DAQ trigger Pure KM signal also collected Results of tests on DAФNE

16 Kaon Monitor TDC (upper/lower coincidence) Single peak resolution Is ~ 100 ps MIP/K separation ~ 1 ns MPPC tdc spectra Single peak resolution Is ~ 300 ps Missing MIPs Results of tests on DAФNE K-K- MIPs

17 New electronics and 64 channels prototype 32 Sci-Fi read at both sides 2 indipendent double layers with adjustable angle Amplification of a factor Constant Fraction Discr. Logic OR of all detectors

18 Single particle conditon (to be further checked) Scintillator 1Scintillator3& Tests on hadronic beam  M-1 beam at Paul Scherrer Institute (PSI, Zurich) ,e -,p beam (similar to DA  NE situation) Double anular setup DAQ trigger: Sc1&Sc2

19 Common cuts for the whole analysis Cut fot T > 31.0 C Protons MIPs Tests on hadronic beam

20 Perfect correlation and coupling Sc1 is used as reference Left Right Tests on hadronic beam

21 Single layer efficiencyDouble layer efficiency Tests on hadronic beam: efficiency Fiber 5: eff = 99 % Fiber 6 : eff = 98,4 % 73% 92% 70% 90%

22 Tests on hadronic beam Beam profile Geometrical correlation

23 2,4%5,2% 6,5% 2% 4,6%2% 1%0,06% Fired fibers of layer 4 if fiber i of layer 4 is fired Tests on hadronic beam: cross talk

24 Conclusions… Temperature feedback circuit implementation New efficiency measurements with scintillators New tests in DA  NE New ideas and applications for this nice setup …and future plans 1) Small dimensions 2) Working in magnetic field 3) Working at room temperature 4) Very good time resolution (  ~ 300 ps) 5) High efficiency …

25 Spare slides

26 Luminescence of carriers can also be absorbed by another pixel giving a noise signal Thermally generated electrons can activate the avalanche process in some pixel, with a high rate of Hz (dark current) The main contribute is a peak corresponding to 1 pixel (photoeletron)‏ MPPC : working principle

27 First prototype and MPPC characterization Pre-Amplifiers (X 100)‏ SiPM (HAMAMATSU U50) (400 pixels)‏ Operating voltage ~70V Scintillating fibers Bicron BCF-10 (blue)‏ 5 Channles HV power supply (stability better than 10 mV)‏ Sr90 beta source (37 MBq)‏

28 First prototype and MPPC characterization Black spectra are the trigger-used MPPC Red spectra are the signal outputs of the NON trigger MPPC Peak with most counts: 5 p.e. (15%) Threshold at 5 p.e.

29 New electronics and 64 channels prototype  ~ 40 ps  ~ 80 ps Direct laser on MPPC MPPC + Sci-Fi

30 Fiber Laser HV MPPC RF Preamp Coincidence TDC RF/n RF=90 MHz (≈ RF/4) n ≈ New electronics and 64 channels prototype  ~ 200 ps No jitter from photon generation (to be considered)

31 Tests on hadronic beam: “relative” efficiency Fiber 5: eff = 27,3 % Fiber 6: eff = 30,1 % In the case of non parallel double layers the geometrical efficiency is drastically reduced

32 Tests on hadronic beam: “relative” efficiency Fiber 5: eff = 27,3 % Fiber 6: eff = 30,1 % In the case of non parallel double layers the geometrical efficiency is drastically reduced

33 Tests on hadronic beam: “relative” efficiency Proton events = 6580 Proton on fibers= 1772 Nhits on fibers > 5 = 29 (1,6%) Single particle configuration !


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