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The trigger system for t he AMADEUS experiment

The trigger system for t he AMADEUS experiment. Trento, ECT* Workshop 2009 October 14, 2009. Alessandro Scordo. A ntikaon M atter A t D A  NE: E xperiments with U nraveling S pectroscopy. AMADEUS collaboration 116 scientists from 14 Countries and 34 Institutes

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The trigger system for t he AMADEUS experiment

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  1. The trigger system for the AMADEUS experiment Trento, ECT* Workshop 2009 October 14, 2009 AlessandroScordo

  2. AntikaonMatterAtDANE:Experiments withUnravelingSpectroscopy AMADEUS collaboration 116 scientists from 14 Countries and 34 Institutes lnf.infn.it/esperimenti/siddharta And LNF-07/24(IR) Report on lnf.infn.it web-page (Library) For the scientific case of AMADEUS experiment: J. Zmeskal, “The AMADEUS experiment”, Thu 15 october

  3. Summary • The idea of the AMADEUS trigger • MPPC characterization and lab tests • Monte Carlo simulation for lab tests • and DAFNE beam • Data taking on DAFNE; results and • future plans VISIT ON THURSDAY AT ITC-irtst

  4. Study of the hadronic interactions of K- in light nuclei at DAΦNE: AMADEUS First dedicated full-acceptance study KLOE K- hadronic interactions in the KLOE data DAΦNE KLOE

  5. The idea of the AMADEUS trigger

  6. Letterof Intend + Day-1 proposal: Study of deeply bound kaonic nuclear statesat DANE2 + Low energy kaon-nuclei Interaction studies - 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 K-ppn Λp Λnp Σ-pp Σ0d Σ0np

  7. The experimental setup of AMADEUS • The AMADEUS setupwillbeimplemented in the 50 cm. gap in KLOE DC aroundthebeam pipe: • Target( A gaseous He target for a firstphase of study) • Trigger (1 or 2 layers of ScFisurroundingtheinteractionpoint) • Innertracker(eventually, a first tracking stagebeforethe DC)

  8. Trigger system • Cilindricallayer of scintillatingfiberssurroundingthebeam pipe totrigger K+ K- in oppositedirections • Single ordoublelayer • Readouttobe done by MPPC(Multi Pixel PhotonCounter) In this case possibility of perform tracking as well: X-Y measurement with high granularity layers target K- e- e+  Trigger system ScFi + MPPC readout K+

  9. Trigger system Usingscintillatingfibers + MPPC

  10. MPPC characterization and lab tests

  11. MPPC tests • Array of single Geiger Mode APD. • Photon counting depending on the PIXEL size • Ideal for: • ScFi coupling • High granularity detector • Time resolution below 1 ns • Insensitive to strong magnetic fields • High gain (>106) and quantum efficiency Different options available in the market, becoming a standard light readout system (Hamamatsu, Photonique, etc) MPPC Hamamatsu S10362-11-050U efective area 1mm2 400 pixel λ = 270-900 nm working biases ̴ 70 V .

  12. MPPC tests: New electronics • - The Geigermode of MPPC makesgainextremelydependent of applied Vbias • A characterization of thisdependencybasedonthepeakdistance of intrinsicnoise: • For a goodbehaviorstability in theappliedvoltagewithgreatprecisionisneededforevery single detector. • Electronics: New NIM modules providing: • Variable Vbias for 5 channels with a stability for • nominal voltages below 10 mV • 2 output / channel: • -Amplified (x50-x100) signal • -Discriminated signal (variable threshold) • Designed by G. Corradi, D. Tagnani, C. Paglia

  13. ScFi + MPPC tests New mechanicalsupportfor 5 ScFireadfrombothsides 10 MPPC + readoutcard • Instrumented fibers: • Saint Gobain BCF- 10 single cladding: • Emission peak 432 nm • Decay time 2,7 ns • 1/e 2.2 m • 4000 ph./MeV Precission support for efficiencies studies November, 2008

  14. Characterizing MPPC: Dark Count Setting a threshold to 0.5 or 1.5 photoelectrons, dark count rates have been evaluated

  15. Characterizing MPPC: Dark Count Detectors were cooled down in order to study their behaviour with temperature variations. A scan of the 1 p.e peak rate is reported Cooling system Peltiercell Dark count 1 p.e signal is reduced by a factor 20!

  16. Characterizing MPPC: reading scintillating fibers A scintillating fiber is activated by a beta Sr90 source Both ends are coupled to detectors; one is used as trigger Setting the threshold for the MPPC used as trigger, most part of dark count is eliminated. In this way spectra due only to the source can be observed

  17. Characterizing MPPC: reading scintillating fibers Studying rates with and without the beta source, it turned out that starting from the 4th p.e. Peak, dark count contribute is negligible This means that non cooling is needed in this case!!!! With 4 p.e. threshold, main peaks of Sr90 are of 4 and 5 photoelectrons.

  18. MC simulations

  19. Montecarlo simulations: what are we expecting? Some geant3 simulations were done in order to understand how many p.e. should be left by Kaons in DAΦNE First, a simulation af a fiber+Sr90 source was done, in order to compare it with experimental data Initial momentum of electrons Mean ~ 150 KeV Momentum spectrum of Sr90

  20. Montecarlo simulations: what are we expecting? Comparing with experimental data: Mean energy loss ~ 150 KeV 600 photons (~4000 ph/MeV) Nominal trapping efficiency ~ 4% 24 photons Attenuation length ~ 2.2 m (1/e) 22 photons (30 cm) Q.D.E. ~ 50 % 11 photons Reading 1 size 5/6 photons Consistent with lab tests

  21. Y K- track R=2.95 cm X Beam Pipe 300 μm Alluminium 376 fibers Double cladding ~ 3% of r r=0.5mm Setup consists in 2 layers of 70 cm scintillating fibers BCF-10 multicladding. Beam Pipe is an alluminium tube with radius r=2.95 cm and 300 μm thickness.

  22. Momentum distribution taken from Kloe MC (MeV) In each layer energy loss by Kaons is ~ 2 MeV This means a factor 13 more than Sr90 e- wich becomes a factor 10 including attenuation length for 70 cm

  23. Data taking on DAΦNE

  24. Trigger system tests: installation at DAΦNE SIDDHARTA setup DAΦNE beam pipe

  25. Trigger system tests: installation at DAΦNE SIDDHARTA setup DAΦNE beam pipe

  26. Trigger system tests: installation at DAΦNE Installation of AMADEUS trigger test setup in DAΦNE 2009

  27. Trigger system tests: installation at DAΦNE Kaon (?) peak around 80 photo-e ~ X 10 from e- and d.c. as expected by simulation Installation of AMADEUS trigger test setup in DAΦNE 22-24 January 2009

  28. Trigger system tests: installation at DAΦNE • Time difference between MIPs and Kaons is ~ 1 ns • Time difference in AMADEUS will be much less (~ 300/400 ps) because trigger will be placed just around the beam pipe • High timing resolution is needed!!!! • TDC spectra are needed to understand behaviour of MIPs and Kaons on fibers • SIDDHARTA Kaon Monitor can be used as reference New data taking on DAFNE with new DAQ (including KM)

  29. Trigger system tests: installation at DAΦNE • KM scintillator at 6 cm from Interaction point • Fibers 5 cm below the lower scintillator • RF/2 and KM coincidence as gate and stop • Pure KM signal also collected • High thresholds for MPPC (above d.c.) MIPs of high energy tail comes from E.M. Shower wich occurs in lead bricks placed as shielding just before interaction region This particles pass with low angle in KM (losing more energy) but not in fibers

  30. Trigger system tests: installation at DAΦNE Kaon Monitor TDC (upper/lower coincidence) TDC working in Common Start (RF/2) Single peak resolution~ 100 ps MIP/K separation ~ 1 ns ~ 3 ns MPPC tdc spectra TDC working in Common Stop (RF/2) Single peak resolution~ 300 ps Missing MIPs

  31. Trigger system tests: installation at DAΦNE Black: MPPC total ADC spectrum Red: MPPC ADC when event on KM Green: MPPC ADC when Kaons in KM Blue: MPPC ADC when MIPs in KM Time correlation between MPPC and KM

  32. Trigger system tests: installation at DAΦNE KM tdc when events on fiber MPPC tdc when Kaons in KM KM total MPPC tdc when MIPs in KM

  33. Trigger system tests: installation at DAΦNE KM tdc when events on fiber MPPC tdc when Kaons in KM FINAL TEST: tdc spectra WITHOUT Kaon Monitor signals as reference KM total MPPC tdc when MIPs in KM

  34. Conclusions AMADEUS • Trigger is a crucial point and some • preliminary indications are coming • from test setup in DAFNE • Achieved best single peak resolution around 300 ps • Final test of feasibility is undergoing • Simulation of K and MIPS on test setup are undergoing @ DAΦNE • First publications: • A. Scordo et al. “Silicon PhotoMultipliers(SiPM) for the AMADEUS trigger system” • Proc. XLVII International Winter Meeting on Nuclear Physics; Bormio(Italy), 26-30 January 2009 • M. Bazzi et al. “Scintillating fibers read by Multi Pixel Photon Counter as trigger system for AMADEUS experiment at DAFNE; AMADEUS technical note IR-1 29/09/2009

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