Summer Student Sessions

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Presentation transcript:

Summer Student Sessions The ALPHA Experiment Summer Student Sessions C. Ø. Rasmussen Aarhus University

Program Reasons for antihydrogen research Goals of the ALPHA experiment One of the techniques - EVC Future measurements

Antihydrogen research

Antihydrogen research Simplest pure antimatter atomic system Antimatter equivalence CPT symmetry Antigravity?

Goals for ALPHA Long term goal: Precision spectroscopy using the 1S-2S transition Main goal with current apparatus: Trap antihydrogen (Nature 2010) Need atoms trapped in the ground state and for considerable time to do spectroscopy (Nature Physics, July 2011) f(1S-2S) = 2 466 061 102 474 851(34) Hz - Hänsch et al.

Trapping antihydrogen Interaction of an (anti) atom with a magnetic field: (ground state) Two kinds of atoms: Low field seeking High field seeking Ground state –> L=0, Pbar angular momentum supressed by ratio of masses The magnetic moment of the antihydrogen atom is, if it is in the ground state, governed by the positron spin, and has the size…

Trapping antihydrogen So we create a 3-dimensional magnetic minimum (max can’t be)

Some challenges Interaction of an (anti)atom with a magnetic field: (In 1T field) Constituent particles do not exist freely on earth (or are rapidly destroyed) Need to create Hbar inside magnetic trap -> Penning trap

Trapping antihydrogen Need of creating Hbar inside trap demands a penning trap in the same place

Cool Particles Antiprotons delivered from AD at 5.3MeV Trappable antihydrogen AD Degrader Electron cooling EVC

EVC (Evaporative Cooling) Coffee in the Break – forced EVC – maxwell distribution

Future Ground state hyperfine transition Switch from low field seeking to high field seeking Laser access - 2012 Antigravity? Spin-flip (high field seekers). First spectroscopic measurement on pure antimatter atomic system

Questions