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ACTAR

ACTAR. NuStar. Si/CsI - Tracking. SPIRAL2. Si – DE-E. A 50 keV resoln 10 19 target option Si - detectors. Si - PSD. Si – TOF/ Active Target. Proton at 2 MeV in Si Range ~ 50 µm C 3 H 6 0.25 mg/cm² = 10 19 Resoln ~ 50 KeV Resoln ~0.3° Protons 30 MeV Range 5 mm Si.

nichole-whitehead
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ACTAR

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  1. ACTAR Darsebury 12-13 June - Lolly

  2. NuStar Si/CsI - Tracking SPIRAL2 Si – DE-E A 50 keV resoln 1019 target option Si - detectors Si - PSD Si – TOF/ Active Target Darsebury 12-13 June - Lolly

  3. Proton at 2 MeV in Si Range ~ 50 µm C3H6 0.25 mg/cm² = 1019 Resoln ~ 50 KeV Resoln ~0.3° Protons 30 MeV Range 5 mm Si Protons at 2 MeV (0.15 MeV) in H2 1 atm Range 32 cm (0.42 cm) H2 gas 10 cm = 3.1020 Resoln 40 KeV (30 keV) Ne = 125e-/mm (750e- /mm) Resoln ~ 2° Protons 30 MeV Range 45,000 mm Sum Numbers Darsebury 12-13 June - Lolly

  4. Dynamic range for p or alphas x10 to x20 • Resolutions for Bragg (Z & A) is approx 15% for Micromegas – is this enough for Z resoln. • Can we get 40keV resoln in energy? What is the resoln. that we request. Darsebury 12-13 June - Lolly

  5. Large angle scattering:No magnet option. • Estimates on Range of p in H2 • Thresh at 1 Atm ~ 0.5 MeV • Thresh at 0.1 Atm ~ 0.1 MeV • 1021 target • Gamma detection possible 50 cm Darsebury 12-13 June - Lolly

  6. EXL IPN ORSAY Gamma detectionin coincidencewith low energy recoils Darsebury 12-13 June - Lolly

  7. Small angle scatteringNo magnet option. • Estimates on Range of p in H2 • Thresh at 1.0 Atm ~ 0.5 MeV • Thresh at 0.2 Atm ~ 0.1 MeV • 1021 target 50 cm Darsebury 12-13 June - Lolly

  8. T2K SEDI CEA Saclay Darsebury 12-13 June - Lolly

  9. Micromegas : Micro Mesh Gaseous Detector TPC for T2K • Micromegas chosen as gas amplifier • 30x30 cm² ie 1400 of 0.8x0.8cm² • Saclay is responsible for the FEE electronics. Namely ASIC + Front-end board+ADC • ASIC T2K has 72 channels ie 20 chip/micomegas • System slow 20Hz – needs trigger Darsebury 12-13 June - Lolly

  10. Some Info • Gain options – 120, 240, 360, 600fC • Shaping times - 0.1, …, 2µs Darsebury 12-13 June - Lolly

  11. Darsebury 12-13 June - Lolly

  12. Darsebury 12-13 June - Lolly

  13. Darsebury 12-13 June - Lolly

  14. Needs • Need to check the gain and dynamic range • Shaping time – drift time of H2 might be too long for high pressure. Limitation approx 2µsec. • Need to have a post doc for 12 to 18 months. • ACTAR test set-up option ~ July 2007 • Order immediately? Darsebury 12-13 June - Lolly

  15. Micromegas Micromegas Spatial resolution • 100 e- /mm deposit • 103 - 104 gain from gas amplifier • 105 -106 e- /mm = 16 – 160fC/mm Darsebury 12-13 June - Lolly

  16. MWPC, GEM & Micromegas Performances Darsebury 12-13 June - Lolly

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