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Fragmentation of 132 Sn

Fragmentation of 132 Sn. 238 U E=950 Mev/u. Fission Fragments. Requirements of SC1. Time Resolution for ToF 1. Δ B ρ / B ρ = 3 10 -4 Δ A/A = 4.5 10 -3 L ~ 18 m. Δ ToF ~150 ps. Size of Scintillator. GICO matrix 1 st order (only X Y). Δ x= Δ y= 1mm Δ p=4% Δ a= Δ b =40 mrad.

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Fragmentation of 132 Sn

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  1. Fragmentation of 132Sn 238U E=950 Mev/u Fission Fragments

  2. Requirements of SC1 TimeResolution for ToF 1 ΔBρ/ Bρ = 3 10-4 ΔA/A = 4.5 10-3 L ~ 18 m ΔToF~150 ps Size of Scintillator GICO matrix 1st order (only X Y) Δx= Δy= 1mm Δp=4% Δa= Δb=40 mrad x ≈ 8.09 cm y ≈ 6.58 cm

  3. MOCADI Simulation TA S1 ~5 cm ~8 cm S2 132Sn @ 1Gev/u Δx= Δy= 1mm Δp=4% Δa=40 mrad

  4. Requirements of SC1 (II) Count rate at S2 Beam intensity: 108 ions/s Target: Pb Thickness: 1.5 g/cm2 132Sn: ~103 ions/s Others:2.6 104 ions/s The very high counting rate at S1 requires a high counting rate photomultiplier tube HAMAMATSU H2431-50MOD assembly

  5. H2431-50MOD • Very fast response (Tr=0.7 ns) • Booster base --> higher rates allowed Insterstage voltage of last dynodes supplied by independent HV power supplies (PS). Even if the output current of PMT is increased, no voltage losses. (Each HV PS keeps a constant voltage)

  6. H2431-50MOD (II) R2083 tube

  7. Improved VME Data Acquisition (DAQ) for the FRS • VME Data Acquisition (Single Event) • VME Data Acquisition (Multi event) • Implementation of Multi Event DAQ • Present Status • Next steps

  8. Rate at S2 is limited by the DAQ, (1 kHz presently) With Multi Event DAQ ~3-4 kHz Degrader at S1 for reducing rate Fragmentation of 132Sn 238U E=950 Mev/u Expected rate ~2.6 104 ions/s

  9. Single Event DAQ • Present DAQ system @ FRS • Each Event trigger corresponds to a readout trigger. • VME modules are read sequentially in single cycle mode. (Address is sent with each data transfer) • Rate limited ≈ 1kHz

  10. Multi event DAQ • Collect up to 32 event in the multi-event buffer of CAEN modules (drawback: only valid for these modules). • They are read in a VME block transfer (faster). Readout is performed after 32 events or end of spill • Each MBS event contains up to 32 event triggers

  11. Implementation Multi event DAQ • Three Different working fields • VME block readout • Setting up new trigger electronics • New analysis routines

  12. Present Status • Readout function already written and working for 2 CAEN V775 TDC modules (col. C. Nociforo, N. Kurz) • Trigger Scheme reproduced in a test rack in the Electronics Lab of FRS • Preliminary GO4 unpacking routines ready

  13. Next Steps • Extend the Readout function to all modules of FRS VME crates • Implement the new trigger electronics • Continue with the GO4 routines for analysis.

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