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Large Area ToF wall for heavy residues from fission and spallation reactions (status)

Large Area ToF wall for heavy residues from fission and spallation reactions (status). E. Casarejos for the GENP,USC, Spain. The ToF-wall for heavy ions. heavy ions: spallation/fragmentation reactions fission reactions. Size and Granularity.

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Large Area ToF wall for heavy residues from fission and spallation reactions (status)

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  1. Large Area ToF wall for heavy residues from fission and spallation reactions (status) E. Casarejos for the GENP,USC, Spain

  2. The ToF-wall for heavy ions heavy ions: • spallation/fragmentation reactions • fission reactions

  3. Size and Granularity • 238U fission @ 500 MeV/u determines the size of the detector. Distance (m) Diameter (m) 5 0.54 Energy 700 MeV/u 10 1.07 15 1.60 20 2.13 • A strip size of 2.5 cm guarantees a double hit probability smaller than 5% Detector requirements Isotopic identification A=200ΔA/A=2.5·10-3

  4. ToF-wall conceptual design • Requirements: • time resolution better than 50 ps • surface about 1.5x1.5 m2 • position resolution around few milimeters • multi-hit capabilities • full aceptance • Proposed solution: • multi-gap Resistive Plate Chambers (RPCs) • modules: 100/150x26 cm2 segmented: 10 x anodes 100/150x2.5 cm2 • detection plane: 6/8 modules • three detection planes (rotated 120o one respect to the other) • about 3x160 electronic channels

  5. E (soda-lime) glass (1 mm) G10 Kapton® +HV Nylon(0,3m) Cu foil RPC as timing detectors EXPERIMENTS • HARP • HADES • ALICE • STAR • some others as trigger detectors NO knowledge of RPCs for fast heavy ions.

  6. x10 x16 1000 mm 260 mm ToF-wall electronics FEE: • GALI-s66 • MAXIM-4223 • (+ 50ohm driver) STAR board: • ‘false’ FEE • 3 stages amplification • TAQUILA input TAQUILA: • threshold • QDC • SAM3-VMEDAQ

  7. (soda-lime) glass (1 mm) G10 Kapton® +HV Nylon(0,3m) Cu foil Construction: prototypes Protoypes: • glasses: compositions, thicknesses • electrodes materials (Cu, graphite) • constructions, structures,… • composite sandwich structures • regular production

  8. Test with cosmic rays • cosmic rays: • characterization as for MIPs • efficiency • homogeneity • electronic setup • time resolution • signal shape • efficiency • charge distribution

  9. 4.4 kV 4.4 kV 4.8 kV 5.0 kV 5.0 kV 12C beam tests • dec’2005 first tentative … • jul’2006 noise… • dec’2006 … • charge distribution • signals

  10. 4.4 kV gain-1 std-mix 4.4 kV gain-2 std-mix 4.4 kV gain-2 2xSF6 12C beam tests • efficiency a) • efficiency b) c) a) b) c) • cf. GSI annual report 2006

  11. Conclusions (& outlook) We have built regularly prototypes and tested different materials. We have the know-how to produce low-noise, spark-free, performant prototypes. Pulse analysis is still our tool for defining the main characteristics of the RPCs behavior. TAQUILA will be soon(!) implemented. RPCs have been investigated for the first time with fast heavy ions. It is yet unclear if 100% efficiency is reached with two gaps. Our electronic FEE evolves fulfilling our needs. Tests with ion beams are key steps for further developments

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