Abstract
A low energy antiproton transport from the ASACUSA's antiproton accumulation trap (MUSASHI trap) to the antihydrogen production trap (double cusp trap) is developed. The longitudinal antiproton energy spread after the transport line is 0.23±0.02 eV, compared with 15 eV with a previous method used in 2012. This reduction is achieved by an adiabatic transport beamline with several pulse-driven coaxial coils. Antihydrogen atoms are synthesized by directly injecting the antiprotons into a positron plasma, resulting in the higher production rate.
Highlights
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This reduction is achieved by an adiabatic transport beamline with several pulse-driven coaxial coils
This paper describes a further development for p injection at 1.5 eV, which led to an observed energy distributions with energy spread σ = 0.23 ± 0.02 eV and resulted in the two orders of magnitude higher H production rate
Summary
The ps are decelerated to 100 keV by a radio frequency quadrupole decelerator (RFQD) [16], and injected into the MUSASHI trap after further deceleration down to 10 keV by a thin foil They are first cooled through collisions with pre-loaded electrons (∼ 108), and radially compressed by applying a rotating-wall electric field (typically 247 kHz, 2 V peak to peak during 120 s) with fewer (∼ 105) electrons [17]. In order to achieve the required magnetic field strength for the adiabatic transport, large currents have to be applied to the three transport coils. They are energized by pulsed currents with time widths of about 50 ms to suppress Joule heating. Since the time of flight of the ps along the transport line is of the order of μs, the magnetic field can be considered constant during p transport
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