MATS. Precision Measurements of Very-Short Lived Nuclei Using an Advances Trapping System for Highly-Charged Ions
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1 MATS Measurements of Very-Short Lived Nuclei Using an Advances Trapping System for Highly-Charged Ions Frank Herfurth, GSI-Darmstadt for the MATS Collaboration TOF Ion production FRS Low Energy Branch νc Time-of-flight detector ν Q Beam bunching Charge breeding q / A - selection Cooling process Mass measurement Detection
2 CSNSM-IN2P3-CNRS Orsay: G. Audi, C. Bechelet, D. Lunney, C. Guénaut, M. Sewtz Universität Greifswald: A. Herlert, G. Marx, L. Schweikhard Universität Erlangen-Nürnberg: P.-G. Reinhard GSI-Darmstadt: D. Beck, M. Block, H. Geissel, F. Herfurth, Yu.A. Litvinov, Yu. N. Novikov, C. Scheidenberger, M. Winkler, C. Yazidjian CERN/GSI-Darmstadt: A. Kellerbauer Universität Mainz: K. Blaum, I.Bloch, S. Djekic, R. Ferrer, S. George, S. Kreim, W. Nörtershäuser, S. Stahl, J. Verdu, C. Weber Universität Gießen: W. Plass University of Jyväskylä: J. Äystö, A. Jokinen, I. Moore, A. Nieminen LLNL-Livermore: D. Schneider LMU München: D. Habs, S. Heinz, O. Kester, V. Kolhinen, J. Szerypo, P.G. Thirolf 15 Institutes 52 Members The MATS collaboration Michigan State University: M. Bender, G. Bollen, M. Matos, S. Schwarz MPI KP Heidelberg: J. Ullrich, J. R. Crespo López-Urrutia Universite Libre de Bruxelles: P.-H. Heenen Stockholm University: T. Fritioff, R. Schuch, N. Szilard Kolkata India: A. Ray
3 effective use of rare species Trapping extended observation & interaction time high quality q/m selection manipulation of charged particles at low E accumulation & bunching EFFICIENCY ACCURACY SENSITIVITY charge breeding polarization Mass measurements and trap assisted nuclear spectroscopy
4 Production measurements on short-lived nuclides. Super FRS Gas Catcher charge breeder m/q selection Penning trap times higher yields than everywhere else 1 50 times higher resolving power as compared to 1+ factor of shorter half-lives higher resoving power and precision beam time saving δm/m < on isotopes with T ½ 100 ms perfect match with FRS LEB capabilities
5 Setup Measurement 0.1 m Detectors: - FT-ICR -TOF-ICR - Si(Li) electron trap: mass measurements Ground Floor Cooler trap: beam preparation spectroscopy 0.1 m Magn. deflector: q/m separation HV Cage HV Cage 0.0 : charge breeding Side View 10.5 m f c 1 = 2π q m B
6 Experiments with Exotic Nuclei Ground Floor Measurement Laser Spectroscopy T 1/2... Mass 0.1 m 0.1 m Detectors: - FT-ICR -TOF-ICR - Si(Li) electron trap: mass measurements Cooler trap: beam preparation & spectroscopy Magn. deflector: q/m separation HV Cage Side View X- ray Spectroscopy HV Cage In-Trap 0.0 Spectroscopy 10.5 m : charge breeding f c 1 = 2π q B m
7 Charge Breeding breeding time (s) O Na K Kr Sb Pb q Results from ISOLDE (Courtesy of F. Wenander)
8 Charge Breeding cryogenic XHV Helmholtz coils open access TITAN (J. Crespo et al.)
9 The Advantage of Highly Charged Ions 1E-6 1E-7 N = Cyclotron frequency: f c 1 = 2π q m B δm / m 1E-8 N = A + 1E-9 z 0 r0 1E A T ex / s - much higher resoving power and precision - reduced beam time requirement
10 TOF Resonance technique Time-of-flight resonance technique MCP Detector Scan of excitation frequency Dipolar radial excitation at f - increase of r - Quadrupolar radial excitation near f c coupling of radial motions, conv. Ejection along the magnetic field lines radial energy converted to axial energy Time-of-flight (TOF) measurement 1.2 m Resolving power: R = f T exc exc
11 Single Ion FT-ICR z magnetic field Penning Trap (cross section) Voltage/Current Amplifier low noise Amp. FFT Fourier-Transformspectral analyser excited ion I ion current signal dp/df FFT mass spectrum Applications slit radially split electrode time-domain time frequency-domain frequency Mass measurements on very rare nuclides High-precision mass measurements on more abundant nuclides
12 Summary Design parameters: Overall efficiency 1-5% Maximum resolving power 10 8 Accessable half-life 10 ms Relative mass uncertainty 10-9 Organisation and responsibilities Mainz, Greifswald, Jyväskylä, Stockholm: GSI, Munich: Heidelberg, GSI, Livermore, Seattle: Giessen, Mainz, Orsay: Mainz, Munich: system cooler and buncher Detection system and electronics Trap assisted spectroscopy MATS will be an advances trapping system for mass spectrometry, laser spectroscopy, and in-trap decay spectroscopy with highly-charged, short-lived ions.
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