Abstract
High-accuracy spectroscopic comparisons of trapped antihydrogen atoms (H¯) and hydrogen atoms (H) promise to stringently test the fundamental CPT symmetry invariance of the standard model of particle physics. ATRAP’s nested Penning-Ioffe trap was developed for such studies. The first of its unique features is that its magnetic Ioffe trap for H¯atoms can be switched between quadrupole and octupole symmetries. The second is that it allows laser and microwave access perpendicular to the central axis of the traps.
Highlights
Superimposed TrapsAs discussed in more detail below, the constraints introduced by superimposing a magnetic-minimum Ioffe trap on the Penning trap mean that the uniform field should not exceed about 1 T
High-accuracy spectroscopic comparisons of trapped antihydrogen atoms (H) and hydrogen atoms (H) promise to stringently test the fundamental CPT symmetry invariance of the standard model of particle physics
Trapped Antihydrogen Towards the end of the 2018 antiproton beam run at CERN’s antiproton decelerator facility, we developed a procedure for repeatably preparing antiproton and positron plasmas in a nested well for H production
Summary
As discussed in more detail below, the constraints introduced by superimposing a magnetic-minimum Ioffe trap on the Penning trap mean that the uniform field should not exceed about 1 T In this field, the e+ radiation time (going as | |−2) of 4 s increases the time it takes to manipulate p and e+ to form cold H atoms. The result is that the energy in the radial and axial motions within these traps is decoupled for a quadrupole trap, but coupled for an octupole, as we will discuss soon in a report on simulations of H motions in our traps This difference persists in a realistic Penning-Ioffe trap, with consequences for how many lasers are required to cool all the motions of the trapped H. A quadrupole trap with controllable addition of an octupole component, for example, could be used to control and manipulate charged particle loss and H lasercooling rates
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