1 / 15

Trapping Challenges and Solutions in ATRAP Antihydrogen Project

Learn about the intricate process of trapping cold antihydrogen by exploiting hyperfine levels, discussing design, testing, and the installation of magnetic fields in the ATRAP project.

callia
Download Presentation

Trapping Challenges and Solutions in ATRAP Antihydrogen Project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related