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Variable Mode High Acceptance Spectrometer

Variable Mode High Acceptance Spectrometer. Detection and Tracking in VAMOS. Studies with Vamos. Measures : - Bρ - angular distributions. In dispersive m ode - direct transfer reactions: 24 Ne(d, 3 He γ …), 26 Ne(d,p γ …), 56 Ni(d,p γ )

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Variable Mode High Acceptance Spectrometer

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  1. Variable Mode High Acceptance Spectrometer Detection and Tracking in VAMOS

  2. Studies with Vamos Measures : - Bρ - angular distributions In dispersivemode - direct transfer reactions: 24Ne(d,3Heγ…), 26Ne(d,pγ…), 56Ni(d,pγ) - multi nucleon transfer/deep inelastic reactions: 48Ca + 238U - fusion reactions: 76Kr + 58Ni In non-dispersivemode - fusion reactions: 18O + 208Pb

  3. Focal Plane detection at 60° DIPOLE QUADRUPOLES EXOGAM Velocity Filter BEAM VAMOS SpectrometerSchematic View

  4. VAMOS in reality

  5. Resolution Θ 0.1° Φ 0.3° Bρ 0.5% M/q 0.5% q 1/30 M 1/200 Z 1/30 φ θ Xf θf Yf φf Bρ M/q TOF V q M E Z ΔE VAMOS Measurement(dispersive mode) M/q ~ Bρ x TOF M ~ E x TOF2 Z2 ~ E x ΔE ~ ΔE/TOF2

  6. Drift Chamber X: charge distribution 2 x 64 pads (6.3x50) mm XFWHM ~200 μm Y: drift time YFWHM ~ 500 μm Ionisation Chamber 2 x 7 pads (50x50) mm 1 x 7 pads (50x 170)mm ΔEFWHM ~ 3% Plastic Detector EFWHM ~ 4% Silicon Wall Light/Fast Ion Detection Dispersive Plane

  7. Drift Chamber Ionisation Chamber Plastic Detector Light/Fast Ion Detection Dispersive Plane

  8. Ionisation Chamber Secondary electron Detector Mylar emissive foil Se-D XFWHM ~ 1 mm YFWHM ~ 2 mm TFWHM ~ 300 ps Heavy/Slow Ion Detection

  9. Secondary electron Detector Silicon Wall QQWFD Mode Very heavy/slow Ion Detection – non dispersive

  10. Examples • Recoil Tagging – non dispersive • Deep inelastic - dispersive • 40Ca at 13.7 MeV/u + natTa • 238U at 5.5 MeV/u + 48Ca

  11. Very-heavy systems: RT and RDT Test experiment : Asymmetric reaction 208Pb(18O,4n)222Th

  12. Energy loss versus ToF

  13. Recoil Tagging

  14. Recoil Decay Tagging

  15. Deep Inelastic Collisionsmeasured with VAMOS 40Ca at 13.7 MeV/u + natTa

  16. Ca Ar S Si Mg Ne K O Cl C P Al Be Na F N B Li Energy Loss versus Energy

  17. Ca Ar S Si Mg Ne O Charge versus Proton Number

  18. Mass versus Mass/Charge All charge states

  19. 42Ca 41Ca 40Ca 36Ar 32S 28Si 24Mg 20Ne 160 Mass versus Mass/Charge One electron Fully stripped Two electrons

  20. Mass

  21. Deep Inelastic Collisions(inverse kinematics) 238U at 5.5 MeV/u + 48Ca

  22. 50Ca 49Ca 48Ca Online spectra of 50Ca

  23. Continuation - Experimentally explore the limits of the existing setup to fully identify the nuclei within the M, Z, Q and E coordinates - Recoil Decay Tagging • To be obtained by • - Short runs with the deep inelastic • reactions induced by Ni, Ge, Kr … beams • Include ΔE measurement of nuclei stopped in gas • Improve the ToF resolution that • limits the M/Q measurement

  24. How to improve ? M/q ~ Bρ x TOF M ~ E x TOF2 Z2 ~ E x ΔE ~ ΔE/TOF2 Bρ : spectrometer resolution ~1/1000  Improve algorithm (easy) ToF : ~ 1/100 (versus HF)  « start » detector, e.g. in the W.F. E : Plastic  Silicon ΔE : silicon detector ?

  25. The MUSETT project MUr de Silicium pour l’Etude des Transfermium par Tagging (Silicon Wall for Transfermium Studies using Tagging) Goals: • Detection of very-heavy/slow ions for RDT • Improved detection for light ions (transfer, deep inelastic)

  26. Musett + SeD Musett RDT 40x10cm 4x128x128 strips Z,A identification (transfer, deep inelastic) Musett + CHIO+SeD Musett + CHIO MUSETT Configurations

  27. Specifications • Granularity (Decay tagging, ray tracing) • Size (Focal plane coverage) • Energy resolution (Alpha spectroscopy, identification) • Window-less (Slow and heavy ions) • Low noise and compact electronics (ASICs) • Fast readout

  28. MUSETT : Cost and planning • 2006 : detector prototype; tests with existing electronics • 2007-2008 : full setup (4 det.) with ASICs electronics • Cost : ~220 k€

  29. Summary • Dispersive mode : transfer, deep-inelastic • SeD, Drift chamber, CHIO, SiWall • Non dispersive : very-heavy elements • Asymmetric reactions, SeD, SiWal • Developments : • Improved ToF (dispersive Mode) • MUSETT : RDT; A,Z,Q identification

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