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The Silicon-TRD: Beam Test Results

The Silicon-TRD: Beam Test Results. SiTRD R & D. M.Brigida a , C.Favuzzi a , P.Fusco a , F.Gargano a , N.Giglietto a , F.Giordano a , F.Loparco a M.N.Mazziotta a , M.Prest b , S. Raino’ a , P.Spinelli a , E.Vallazza b. a Dipartimento di Fisica Università di Bari and INFN Sez ione di Bari

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The Silicon-TRD: Beam Test Results

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  1. The Silicon-TRD: Beam Test Results SiTRD R&D M.Brigidaa, C.Favuzzia, P.Fuscoa, F.Garganoa, N.Gigliettoa, F.Giordanoa, F.Loparcoa M.N.Mazziottaa, M.Prestb, S. Raino’ a, P.Spinellia, E.Vallazzab aDipartimento di Fisica Università di Bari and INFN Sezione di Bari bINFN Sezione di Trieste F.Giordano

  2. SiTRD R&D Outline • Introduction • Beam Test Description • Data Analysis and Results • Monte Carlo Simulation • Conclusions F.Giordano

  3. Introduction SiTRD R&D High Z gas detectors are typically used to detect TR X-rays Background = ionization energy loss of radiating particle Measurements were performed on the TR spectra using silicon diodes (Li-drifted): a magnetic field separates the radiating particle by TR photons and the Si detector is located a few meters downstream from the radiator i.e. Fabjan NIM 146 (77) 343 Silicon strip detectors (SSD) with a few tenths of micron of pitch can be combined with a B field to separate the particles from photons in short distances F.Giordano

  4. Experimental Set-up (CERN-PS) 5 cm C fibers radiator 50 cm 30 cm 15 cm Pb-Glass Č1 Č2 S2 S4 B1T S3 S1 z y 15 cm SiTRD R&D • Single Side • Surface area: 3×3 cm2 • Thickness: 300 mm • Strip Pitch: 25 mm • Read-out Pitch:50 mm x y TRIGGER: e-: Pb Č1 Č2 S p-: Pb Č1 Č2 S x z F.Giordano

  5. Experimental Set-up (Photos) SiTRD R&D The Cerenkov counters did not work properly during the data taking: no reliable rejection electron/pion analysis could be performed! F.Giordano

  6. The Magnet B field longitudinal profile B=1T 15 cm Distance from centre SiTRD R&D  B dl = 0.15 Tm Separation  34 Strips (Strip Pitch 50 mm) Up to p=30 GeV/c Carbon Fiber Radiator F.Giordano

  7. SSD Noise evaluation SiTRD R&D <sped> 3.6 ADC ch (850 eV) S/N  100 TR Energy10 keV X-rays search cut =6sped F.Giordano

  8. Analysis strategies SiTRD R&D • Cluster finding to take into account the charge sharing effect: • Search of a strip signal > 20sped • Adjacent strips with signal > 10sped • Events with only one cluster per plane • Evaluation of the particle direction by means of the upstream telescope • Projectionof the track on the downstream silicon wafer • X-ray search: • Track shadow: ± 25 strips around the track projection • Looking for a signal > 6sped within the shadow region The sped refers to single strip RMS pedestal F.Giordano

  9. SSD display SiTRD R&D 6 s level 20 s level 0 50 75 X (cm) F.Giordano

  10. X-ray position respect to particle SiTRD R&D 2 GeV/c:65 Strips 1 GeV/c:130 Strips F.Giordano

  11. Energy Loss & Calibration SiTRD R&D The ADC channel distribution is fitted with a Landau function: the most probable value has been set to 80 keV (S. Hancock et al., Phys. Rev. A 28 (1983) 615) Number of events Number of events Energy loss (keV) ADC channels F.Giordano

  12. A run without radiator @ 2GeV/c SiTRD R&D 669 reconstructed charged particles 40 (~6%) ghost X-rays: noisy strips! F.Giordano

  13. X-ray Energy Spectra SiTRD R&D 2 GeV/c “electrons” 1 GeV/c “electrons” Background F.Giordano

  14. Full Monte Carlo simulation SiTRD R&D • A Monte Carlo code has been developed to simulate the beam test set-up • The MC is based on GEANT 3.21 and HEED • The TR process has been included • The electronics response has been also taken into account The simulated data has been analyzed using the same procedure as for real data For more details see: “The Silicon-TRD: A Full Monte-Carlo Simulation” @ the Poster Session F.Giordano

  15. MC results SiTRD R&D 1000 simulated events for each momentum 1 GeV/c X-ray Electron p Contamination  10-3 @ee60% 2 GeV/c F.Giordano

  16. Conclusions SiTRD R&D • A Silicon Strip Detector (SSD) combined with a magnetic field has been used to detect TR X-rays • A beam test has demonstrated the feasibility of the design • A full Monte Carlo code has been developedto validate the R&D • Further tests and analyses are needed to better study the detector performance F.Giordano

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