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Extraction efficiency and extraction times of the SHIPTRAP gas stopping cell

Extraction efficiency and extraction times of the SHIPTRAP gas stopping cell. Gleb Vorobjev for SHIPTRAP collaboration, GSI. SMI, 27 . March 200 6. Outline. Introduction: Off-line experimental set-up Investigation of the gas cell: Summary. SHIPTRAP set-up SHIPTRAP gas stopping cell.

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Extraction efficiency and extraction times of the SHIPTRAP gas stopping cell

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  1. Extraction efficiency and extraction times of the SHIPTRAP gas stopping cell Gleb Vorobjev for SHIPTRAP collaboration, GSI SMI, 27. March 2006

  2. Outline Introduction: Off-line experimental set-up Investigation of the gas cell: Summary SHIPTRAP set-up SHIPTRAP gas stopping cell Extraction times Extraction efficiencies Total efficiency Impurities On-line beam

  3. Set-up layout Nin 100% 30% Nout Nout/Nin= ? 50% 100%

  4. J.Neumayr; PhD-thesis

  5. Experimental set-up Features of 223Ra source: • T1/2(223Ra)=11.4 d • max. activity ~10,000 decays/s • available recoil ions 219Rn+, (215Po+), 211Pb+, 207Tl+ • characteristic a-decay for identification • point-like • determine (absolute) extraction efficiency

  6. Experimental set-up

  7. Extraction time linear trend described by mobility formalism PHe = 40 mbar Axial E-field = 5 V/cm PHe : (40-100) mbar Axial E-field 10 V/cm Nuclides with T1/2>10 ms accessible at SHIPTRAP

  8. Extraction efficiency Main losses are due to diffusion RF-funnel is less efficient Neutralisation < extraction time

  9. Stopping efficiency

  10. Total efficiency measurement

  11. Total efficiency (measured on-line) Measured total efficiencies 4-8%

  12. Influence of contaminants Before bake-out Xe+ After bake-out (24 hours, 1500) 219Rn+ 219Rn+ 211Pb+ + 211Bi+ 207Tl+ + 207Pb+ Xe+ 2112+ 215Po+ Er+

  13. On-line regime TOF, 2m 58Ni + 92Mo -> 150Yb* 50Cr + 58Ni -> 108Te*

  14. Gas cell is fast: nuclides with T1/2>10 ms are accessible Extraction efficiency ~ 20 % at 40 mbar Total efficiency ~ 13 % in the range of 70-80 mbar Diffusion is crucial: higher pressure, stronger axial field needed Neutralisation is slower than extraction Scattered primary beam is not allowed to enter the gas cell Conclusions

  15. SHIPTRAP collaboration GSI / SHIPTRAP D. Ackermann M. Block D. Beck M. Dworschak S. Eliseev F. Herfurth F. P. Heßberger S. Hofmann H.-J. Kluge A. Martín M. Mazzocco W. Quint C. Rauth G. Vorobjev Mainz K. Blaum R. Ferrer C. Weber H. Backe P. Kunz W. Lauth Munich D. Habs V. Kolhinen J. Neumayr M. Sewtz P. Thirolf Greifswald A. Chaudhuri G. Marx L. Schweikhard Giessen Z. Di H. Geissel C. Scheidenberger M. Petrick W. Plaß St. Petersburg Y. Novikov Former PhD students: G. Sikler, D. Rodríguez, M. Mukherjee, S. Rahaman, ...

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