Experiments on excited states of antihydrogen already present in the beam will be proposed and presented including Lamb shift measurements (sensitive to antiproton radius) and spectroscopy of Ry states (sensitive to anti-Rydberg constant). Far future prospects for making different low energy antimatter species may be presented if I have time.
Antiprotons:
The Double Cusp Magnet is optimized to focus ground state low-field-seeking (GS-LFS) atoms with kinetic energy equivalent to a temperature T in the range 5 < T < 20 K. If we can reduce the Hbar energy to this range, then at least x10 more GS-LFS atoms will escape the trap as a beam compared to 2024 (or more than x10, since lower T increases the time Hbar spends in the positron...
Charge exchange between an antiproton and a positronium atom can produce antihydrogen. If Rydberg positronium is used a resonant mechanism can produce Rydberg antihydrogen in well defined states. The feasibility of using this mechanism to produce a pulsed antihydrogen beam will be explored.
An array of diagnostic and manipulation methods share the use of trap-wall electrostatic perturbations and/or induced-charge signals. Possibilities include measurement of basic sample properties (number, density, temperature) as well as their control (e.g., feedback- or autoresonant positioning, collective mode cooling). Some of these possibilities have been tossed around and partially tested...
In this presentation, a new idea for producing a buffer gas free higher efficiency positron trap will be presented
A grant application (FWF) is planned for this year. We will propose to develop the required techniques for Ramsey spectroscopy with hydrogen in a short (Rabi) setup in Vienna.
To achieve static magnetic fields of sufficient homogeneity over the increased volume of the Ramsey spectrometer a Type I superconducting tube shall be used. Providing the 1.42 GHz microwaves inside this tube without...
I will discuss the accuracy of current CPT tests and argue that the highest resolution for spectroscopy will require a fountain.
The PAX project seeks to perform highest precision x-ray spectroscopy of Rydberg states in antiprotonic atoms in order to study strong-field QED effects in a region heretofore unexplored [1]. The project is based on the confluence of low-energy antiproton beams at ELENA, and newly available Transition Edge Sensor (TES) microcalorimeter detectors that allow for 10E-4 intrinsic energy resolution...
MUSASHI can provide 1-1000 eV pbar beams that enable the study of elementary atomic processes of ionisation by antiproton impact and antiprotonic atom (pbarA) formation under single collision conditions. ASACUSA had measured ionisation cross sections of atomic or molecular targets such as D2, He, Ar, etc., down to 2.4 keV. However, atomic collisions at lower energies, especially below 1 keV,...
We propose to study annihilation on three nucleons, p3He→ pn, for which no data exist. The annihilation mechanism is not well known with two competing models on the market, rescattering which involves hadrons, and fireball which involves quarks. The branching fraction is predicted to be around 10(−6) for the latter, compared to 10(-7)–10**(-8) for rescattering. The experiment requires a...
This proposal outlines a two-part experimental campaign aimed at improving our understanding of antiproton-nucleus interactions. In the first part, we propose the measurement of annihilation cross-sections of antiprotons at 100 keV using the ELENA decelerator in mini-bunch mode, using a time-of-flight technique. In the second part, we extend the study to energies of 5.3 MeV and above using...
Antiprotons can reflect from MCP surfaces. We aim to characterize this effect to inprove our diagnostics. By extracting particles from a pure antiproton plasma from the Cusp trap to the Cusp MCP in short bunches, we are able to measure their arrival times. If we make a histogram of arrival times, we expect a main peak upon first arrival, as well as multiple smaller peaks from reflections...
We propose a three-step program to address the issue of antiproton interferometry and the Aharonov-Bohm effect with the antiproton. In the first part of the development we will make use of the (100 keV) TELMAX beam to characterize the geometrical reconstruction by pions of the antiprotons impact point. The following step will be the first direct demonstration of antiproton interferometry,...
In this talk I will discuss options for upgrading the antihydrogen detector.
I would like to discuss options to build and operate a parallel H-Beam experiment at the AD.
As we have a second cavity with McKeehan coils now, this could be doable with reasonable effort.
To make it a cost-efficient, low-maintenance apparatus I would propose a room temperature beam and discuss detection methods where multi-stage differential pumping can be avoided.
A simultaneous hydrogen...
