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MUSETT: the segmented Si array for the focal plane of the VAMOS spectrometer

MUSETT: the segmented Si array for the focal plane of the VAMOS spectrometer. Ch. THEISEN – CEA Saclay Christophe.theisen@cea.fr. What is MUSETT. MU r de S ilicium pour l’ E tude des T ransfermium par T agging Collaboration Saclay - Ganil

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MUSETT: the segmented Si array for the focal plane of the VAMOS spectrometer

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  1. MUSETT: the segmented Si array for the focal plane of theVAMOS spectrometer Ch. THEISEN – CEA Saclay Christophe.theisen@cea.fr - Christophe THEISEN - INTAG Workshop GSI

  2. What is MUSETT • MUr de Silicium pour l’Etude des Transfermium par Tagging • Collaboration Saclay - Ganil • Spectroscopy of heavy element with VAMOS and EXOGAM using the RDT technique Motivations : • VAMOS : well adapted to asymmetric reactions • Large angular acceptance • Large transmission • Beam rejection with the Wien Filter • EXOGAM : high efficiency (single and coincidences). Constrains: • Very slow and very heavy ions • Optics of Vamos • Alpha particle spectroscopy • Segmentation for the RDT technique • Time stamping • Option : energy loss and tracking of heavy ions - Christophe THEISEN - INTAG Workshop GSI

  3. MUSETT at VAMOS + EXOGAM - Christophe THEISEN - INTAG Workshop GSI

  4. VAMOS optics Wien Filter tuned on residues; dipole on Beam dispersion  background Wien Filter tuned on beam; dipole off Beam focused Optics optimized on residues in both cases - Christophe THEISEN - INTAG Workshop GSI

  5. VAMOS optics WF tuned on recoils WF tuned on beam Beam Beam 1+ 5+ 10+ - Christophe THEISEN - INTAG Workshop GSI

  6. Si detectors (Not a MUST II detector, this is a MUSETT one…) - Christophe THEISEN - INTAG Workshop GSI

  7. Si detectors • Characteristics • 300 μm thick • 10 x 10 cm2 • 128 + 128 strips • 3 % Al grid • Front side : No Aluminum layer. < 0.25 μm B implantation • Depletion ~ 30 V. Nominal voltage ~ 60 V. • Provided by Micron Semiconductor • 2 evaluation detector + 1 prototype received - Christophe THEISEN - INTAG Workshop GSI

  8. Si detectors - Christophe THEISEN - INTAG Workshop GSI

  9. Si detectors mechanics - Christophe THEISEN - INTAG Workshop GSI

  10. Electronics and DAQ for Si detectors • See next presentation… ATHED MUVI CVM - Christophe THEISEN - INTAG Workshop GSI

  11. Gas detectors Energy loss IC DSSD D 5-10 Torr Iso 16 MeV 57 MeV Bi 150MeV 55 MeV α Elect Elect Elect Escaped radioactivity - Christophe THEISEN - INTAG Workshop GSI

  12. Gas detector Constrains • Large dynamics : heavy ions + escaped radioactivity • Hybrid detector Ionisation Chamber + Drift Chamber • Small energy loss of heavy ions • Low pressure • Small effect on/off Si Wall • Coexistence of IC/DC fields • Integration in HARPEE mechanics - Christophe THEISEN - INTAG Workshop GSI

  13. Mechanics integration • Integration in the HARPEE mechanics : easy installation / maintenance • Si Wall module • Gas detector module - Christophe THEISEN - INTAG Workshop GSI

  14. Status • 3 Si detectors received • ATHED ASICs : ready • COFEE Front-end being tested • CVM VME readout and DAQ ready. Need to be tested with COFEE. • MUVI VXI readout : prototypes OK. Production soon • Mechanics for Si : drawing ready, prototype soon • Gas detector : R & D phase. Prototype 2007 - Christophe THEISEN - INTAG Workshop GSI

  15. Perspectives SPIRAL2 S3 focal plane - Christophe THEISEN - INTAG Workshop GSI

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