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Characterizing the EBIS-C Spectrometer

Characterizing the EBIS-C Spectrometer. Leah VanNahmen REU 2006 Kansas State University. Introduction. Spectrometer Basics Recoil Ions Beam Fragments Summary Applications. Spectrometer Basics. GOAL: Determine initial momentum of all products from a collision Gas Jet = Recoil Ions

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Characterizing the EBIS-C Spectrometer

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  1. Characterizing the EBIS-C Spectrometer Leah VanNahmen REU 2006 Kansas State University

  2. Introduction • Spectrometer Basics • Recoil Ions • Beam Fragments • Summary • Applications

  3. Spectrometer Basics • GOAL: Determine initial momentum of all products from a collision • Gas Jet = Recoil Ions • Particle Beam = Beam Fragments • Detector MCP and PSD collect TOF and Final Position

  4. Recoil Ions • We find recoil ions’ initial momentum from TOF using momentum conversion • Problem: Particles with different initial momenta can have the same TOF

  5. Recoil Ions Solution: Space and Time Focusing • Make “voltage hill” • Best focusing if 2nd applied voltage is 82.8% of 1st voltage

  6. The EBIS-C spectrometer has great focusing! Recoil Ions

  7. Magnification of Y Position Magnification of Y Velocity Beam Fragments Problem: Magnification D = vt Spectrometer Axis Spectrometer Axis

  8. Beam Fragments Solution: Find an equation to correct for both kinds of magnification

  9. Beam Fragments Overall Magnification Solution: • Overall magnified Y position =magnification of Y positionxinitial y position+magnification of Y velocityxinitial Y velocityxTOF • Ym= MYix Yi+ MVyx vy x TOF

  10. Summary • Apply two voltages to spectrometer to focus recoil ions • Correct for magnification of beam fragments • End up with enough equations to find the initial momentum of all the products from a collision

  11. Applications • This characterization will allow experimenters to quickly and easily focus the EBIS-C spectrometer and correct for the magnification it causes • The spectrometer will be used in the EBIS-C beamline for future experiments…..

  12. Applications

  13. Applications In Ar/He experiment: Ar + H2+ • H+ + H + Ar • H + H + Ar+

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