Publications (16)
Compression of Antiproton Clouds for Antihydrogen Trapping
G. B. Andresen, W. Bertsche, P. D. Bowe +33
Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report the first detailed measurements of the radial manipulation of antiproton…
A novel antiproton radial diagnostic based on octupole induced ballistic loss
G. B. Andresen, W. Bertsche, P. D. Bowe +35
We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the tim…
Alpha Antihydrogen Experiment
ALPHA Collaboration, M. C. Fujiwara, G. B. Andresen +37
ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our re…
Centrifugal separation and equilibration dynamics in an electron-antiproton plasma
G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz +34
Charges in cold, multiple-species, non-neutral plasmas separate radially by mass, forming centrifugally-separated states. Here, we report the first detailed measurements of such st…
Antihydrogen formation dynamics in a multipolar neutral anti-atom trap
G. B. Andresen, W. Bertsche, P. D. Bowe +33
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 uniqu…
Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN
ALPHA Collaboration, M. C. Fujiwara, G. B. Andresen +37
We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facili…
In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap
C. Amole, M. D. Ashkezari, M. Baquero-Ruiz +37
We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as…
Limit on the Electric Charge of Antihydrogen
A. Capra, C. Amole, M. D. Ashkezari +37
The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, . An analysis of trapping data allowed a strin…
An ultracold low emittance electron source
G. Xia, M. Harvey, A. J. Murray +5
Ultracold atom-based electron sources have recently been proposed as an alternative to the conventional photo-injectors or thermionic electron guns widely used in modern particle a…
Confinement of antihydrogen for 1000 seconds
ALPHA Collaboration, G. B. Andresen, M. D. Ashkezari +36
Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it…
Low energy Beam Tracking Under Scattering for a Cold Electron Source in Manchester
R Appleby, W. Bertsche, M. Harvey +5
High quality electron beams, with high spatial and tempo- ral resolution, have an important use in electron diffraction experiments to probe and study the constituents of matter. A…
An ultracold electron facility in Manchester
O. Mete, R. Appleby, W. Bertsche +4
An ultra-cold atom based electron source (CAES) facility has been built in the Photon Science Institute (PSI), University of Manchester. In this paper, the key components and worki…
Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap
M. C. Fujiwara, G. Andresen, W. Bertsche +32
ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antih…
Evaporative Cooling of Antiprotons to Cryogenic Temperatures
ALPHA Collaboration, G. B. Andresen, M. D. Ashkezari +37
We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9~K. We have modeled the evaporation pro…
Design and Performance of a Novel Low Energy Multi-Species Beamline for the ALPHA Antihydrogen Experiment
C. J. Baker, W. Bertsche, A. Capra +47
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ( 100 eV) positron and antiproton transport be…
Antihydrogen and mirror-trapped antiproton discrimination: Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap
C. Amole, G. B. Andresen, M. D. Ashkezari +35
Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were dete…