Friday, February 4, 2011, 3:30 pm — Large Seminar Room, Bldg. 510
Antihydrogen, the bound state of an antiproton and a positron, can be used as a test-bed of fundamental symmetries. In particular, the CPT Theorem requires that hydrogen and antihydrogen have the same spectrum. Since current experimental precision of measurements of hydrogen transition frequencies approaches 1 part in 1014, similarly precise antihydrogen spectroscopy would constitute a precision, model-independent test of CPT symmetry. Antihydrogen atoms have been produced in quantity at CERN since 2002, when the ATHENA collaboration demonstrated1 how to mix cryogenic plasmas of antiprotons and positrons to produce low energy anti-atoms. In this seminar I will discuss the newest development along the road to antihydrogen spectroscopy – magnetically trapped antihydrogen. In November of 2010 the ALPHA collaboration reported2 the first trapping of antihydrogen atoms in a magnetic multipole trap. The atoms must be produced with an energy - in temperature units - of less than 0.5 K in order to be trapped. I will discuss the many developments – including special magnets constructed by BNL’s Superconducting Magnet Division - necessary to realize trapped antihydrogen, and I will take a look at the future of antihydrogen physics at CERN.
Hosted by: Aihong Tang
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