Category: Publication Content Type
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Antihydrogen formation dynamics in a multipolar neutral anti-atom trap
Antihydrogen formation dynamics in a multipolar neutral anti-atom trap 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
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Antiproton, positron, and electron imaging with a microchannel plate/phosphor detector
Antiproton, positron, and electron imaging with a microchannel plate/phosphor detector A microchannel plate (MCP)/phosphor screen assembly has been used to destructively measure the radial profile of cold, confined antiprotons, electrons, and positrons in the ALPHA experiment, with the goal of using these trapped particles for antihydrogen creation and confinement. The response of the MCP to
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Magnetic multipole induced zero-rotation frequency bounce-resonant loss in a Penning-Malmberg trap used for antihydrogen trapping
Magnetic multipole induced zero-rotation frequency bounce-resonant loss in a Penning-Malmberg trap used for antihydrogen trapping In many antihydrogen trapping schemes, antiprotons held in a short-well Penning–Malmberg trap are released into a longer well. This process necessarily causes the bounce-averaged rotation frequency \omegar of the antiprotons around the trap axis to pass through zero. In the
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Development Of An Antihydrogen Trapping Apparatus
Development Of An Antihydrogen Trapping Apparatus This thesis details the development and commissioning of the ALPHA antihydrogen trapping apparatus. It discusses the history of antimatter physics that led to and enabled the design of the apparatus. It discusses the importance of antihydrogen trapping in testing one of the basic assumptions of the Standard Model of
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Antihydrogen Physics at ALPHA/CERN
Antihydrogen Physics at ALPHA/CERN Cold antihydrogen has been produced at CERN (Amoretti et al. (Nature, 419, 456 (2002)), Gabrielse et al. (Phys. Rev. Lett. 89, 213401 (2002))), with the aim of performing a high-precision spectroscopic comparison with hydrogen as a test of the CPT symmetry. Hydrogen, a unique system used for the development of quantum
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Antiproton compression and radial measurements
Antiproton compression and radial measurements Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, achieved by manipulating spatially overlapped electron plasmas. We show detailed measurements of the near-axis antiproton
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Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN
Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN 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 facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy
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First Attempts at Antihydrogen Trapping in ALPHA
First Attempts at Antihydrogen Trapping in ALPHA The ALPHA apparatus is designed to produce and trap antihydrogen atoms. The device comprises a multifunction Penning trap and a superconducting, neutral atom trap having a minimum-B configuration. The atom trap features an octupole magnet for transverse confinement and solenoidal mirror coils for longitudinal confinement. The magnetic trap
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Confronting CPT with cold trapped Antihydrogen
Confronting CPT with cold trapped Antihydrogen 「水素原子がすっかり分かってしまったら，物理全体がす っかり分かってしまったのも同然だ」と […] Makoto C. Fujiwara Japan Association of High Energy Physicist (in Japanese) Japan Association of High Energy Physicists, High Energy Physics News 27, pp. 37-46 (2008) (in Japanese)
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Compression of Antiproton Clouds for Antihydrogen Trapping
Compression of Antiproton Clouds for Antihydrogen Trapping 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 clouds, including areal density compressions by factors as large as ten, by manipulating spatially overlapped electron plasmas. We show detailed measurements of