J. Harasimowicz

Scintillating screens sensitivity and resolution studies for low energy, low intensity beam diagnostics

Targeting at Civil Engineering teaching situation in China, we design Virtual Engineering Structural Experimental System using virtual technology. Based on object-oriented development process, we put up the general system frame. We complete function analysis and use case model. We work out the detailed use case description by activity diagram, and system design by class diagram. We finish all above work by UML(the unified modeling language). Based on the design and analysis we finish the system implementation which has been used in practice and achieved good effects. The system realizes the simulation of real experiment by the interaction of the system and user. The system has advantages of saving resources, being repeatable and having no objective condition limitations comparing with traditional experiment. The virtual test system has significance on teaching and production of Civil Engineering.In order to investigate the limits of scintillating screens for beam profile monitoring in the ultra-low energy, ultra-low intensity regime, CsI:Tl, YAG:Ce, and a Tb glass-based scintillating fiber optic plate (SFOP) were tested. The screens response to 200 and 50 keV proton beams with intensities ranging from a few picoampere down to the subfemtoampere region was examined. In the following paper, the sensitivity and resolution studies are presented in detail for CsI:Tl and the SFOP, the two most sensitive screens. In addition, a possible use of scintillators for ultra-low energy antiproton beam monitoring is discussed.

Detection of low energy antiproton annihilations in a segmented silicon detector

The goal of the AEIS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earths gravitational acceleration on antimatter by measuring the free fall of a pulsed, cold antihydrogen beam. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1% precision on the measurement of with about 600 reconstructed and time tagged annihilations. We present here the prospects for the development of the AEIS silicon position sentive detector and the results from the first beam tests on a monolithic silicon pixel sensor, along with a comparison to Monte Carlo simulations.

Physical Society of Japan : Beam diagnostics for low energy antiprotons

This paper presents a comprehensive set of beam diagnostics that has been developed to characterize low energy antiproton and ion beams (during initial machine commissioning) and subsequent facility operation. It shows results from simulations and experiments using invasive and non-invasive monitors for absolute beam current measurements; capacitive pickups for position detection; scintillating screens, secondary emission monitors and micro channel plate detectors for transverse profile monitoring, as well as an ultra-cold gas jet for minimally-invasive profile measurements and in-ring experiments. The identified limits are discussed for each technique, and options for further improvements are indicated.