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ATRAP A ntihydrogen TRAP ping

ATRAP A ntihydrogen TRAP ping. Eric Lindsey Reed College Dr. Gerald Gabrielse, Dr. Jonathan Wrubel University of Michigan / CERN REU Program 8 August, 2007. Overview. Antimatter CERN’s Antiproton Decelerator (AD) Why Antihydrogen? Trapping Challenges XY Moveable Stage Design

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ATRAP A ntihydrogen TRAP ping

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  1. ATRAPAntihydrogen TRAPping Eric Lindsey Reed College Dr. Gerald Gabrielse, Dr. Jonathan Wrubel University of Michigan / CERN REU Program 8 August, 2007

  2. Overview • Antimatter • CERN’s Antiproton Decelerator (AD) • Why Antihydrogen? • Trapping Challenges • XY Moveable Stage • Design • Implementation • Testing • Trap Installation Eric Lindsey

  3. Antimatter: The AD • PS delivers 26 GeV protons • Reaction: p + p  p + p + p + p • AD slows p to 5.3 MeV (Stochastic; RF cooling) • Delivers 3 x 107p every 100 sec Eric Lindsey

  4. Antimatter: Why H? • CPT comparison with hydrogen; 1 part in 1012-15 ! • Current baryon precision: 10-9 Source: Gabrielse 2005 • Not an easy goal. Need: • Cold Antihydrogen (ground state) • Coherent Lyman- source (121.6 nm) Eric Lindsey

  5. (Wavelength: 21 cm) How to Trap H An (anti)atom is neutral! Electric fields won’t work... Exploit hyperfine levels of the 1S state. Reported for Hydrogen: H. F. Hess, G. P. Kochanski, J. M. Doyle, N. Masuhara, D. Kleppner, and T. J. Greytak, Phys. Rev. Lett 59, 672 (1987). Source: Larochelle 2007 Eric Lindsey

  6. Radial: Quadrupole Axial: Pinch coils Solution: The Ioffe Trap Need a magnetic minimum in all directions. Eric Lindsey

  7. B + = Magnetic Field trouble Add (solenoidal) Penning trap field to the Ioffe trap fields: Lost Particles! Eric Lindsey

  8. Magnetic Field trouble Octupole has a larger trapping region. CTRAP! May or may not be an advantage. Eric Lindsey

  9. ? ? Project: XY Stage Moveable stage controls positron, electron loading. Problem: Where is the stage located? Solution: Potentiometer LEDs / Photodiode Thanks to A. Pich Eric Lindsey

  10. XY Stage: Position Potentiometer: 4-Wire resistance measurement RPot=(-VARB)/VB LEDs and Photodiode: Vout is nonzero when photodiode receives a signal (in front of LED) Eric Lindsey

  11. XY Stage: Design • Input: 32-pin cable from experiment • Output: 6 Chassis-Isolated BNCs • Constructed mostly with components I scrounged from the lab • Communicates via TCP/IP with LabVIEW (not yet) Eric Lindsey

  12. XY Stage: Testing Results: Potentiometer: consistently too high (calibration) Off by 2.40.3% Uncertainty: 0.2 mm Photodiode works! Signal ~100mV, background ~1mV Peak width 1.10.1 mm (FWHM) Eric Lindsey

  13. Leak fixed! Trap Installation Eric Lindsey

  14. Cultural Immersion!

  15. Thanks! Many thanks to Jean Krisch, Homer Neal, Steven Goldfarb, Jeremy Herr ATRAP Collaboration -- Gerald Gabrielse, Jonathan Wrubel, Ben Levitt, and the rest of the collaboration! U. Michigan, NSF, CERN Summer Program, Ford Eric Lindsey

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