Abstract
Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms. Using our unique annihilation imaging detector, we correlate antihydrogen detection by imaging and by field-ionization for the first time. We further establish how field-ionization causes radial redistribution of the antiprotons during antihydrogen formation and use this effect for the first simultaneous measurements of strongly and weakly bound antihydrogen atoms. Distinguishing between these provides critical information needed in the process of optimizing for trappable antihydrogen. These observations are of crucial importance to the ultimate goal of performing CPT tests involving antihydrogen, which likely depends upon trapping the anti-atom.
Highlights
Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms
There are evident side peaks in the axial distribution (Fig. 3f). It is beyond the scope of this letter to characterize the radial imaging with the neutral atom trap fields, the axial distribution can provide some insights into the particle dynamics during mixing, and help elucidate what fraction of the annihilations on the wall is due to H
After Hformation, we find, using our Micro Channel Plate-based diagnostic (MCP) diagnostic, that ∼69% of the pinjected are left with the same radial extent as before injection
Summary
Pare held in adjacent potential wells (Figure 1). By slowly raising the voltage that confines the e+, over a period of typically 100 s, we bring the two particle species into contact and form H. A second, complementary, method to establish Hformation is to intentionally field-ionize weakly bound H , trap their pin a particular well and count the number held [3, 19]. This was done by deliberately ejecting them from the well onto the aluminum degrader foil and monitoring the resulting annihilations with external detectors. This so-called ionization well is shown, and we refer to the pin this well as intentionally field-ionized H.
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