Abstract
In the Linear accelerator 3 (Linac 3) and Low Energy Ion Ring (LEIR) at CERN dedicated beam stoppers intercept ion beams for machine and personnel protection whenever required. The interaction of accelerated ions and the stopper induces through-thickness heat deposition in the stopper material as deep as a few hundreds of micrometers. Following a multi-layered geometrical discretization this paper discusses the thermal and structural performance of the stoppers under different ion beams (Pb, Xe, Ar). Design considerations based on the projected range of different ions in target materials (aluminum, steel and copper alloys) are discussed. An improved design for ion stoppers based on thermo-structural performance and projected range is proposed.
Highlights
The Linear accelerator 3 (Linac 3) and the Low Energy Ion Ring (LEIR) at CERN prepare ion beams to be injected in the Proton Synchrotron (PS) and for the subsequence accelerator chain
The current design of the beam stoppers in Linac 3 and LEIR dates from the early 1990s with limited design documentation available
With the objective of harmonizing the design of beam stoppers with those of similar devices at CERN we study the compatibility of a small size beam stopper design from ELENA (Extra Low Energy Antiproton) [14] adapted to Linac 3 and LEIR (Fig. 7)
Summary
The Linear accelerator 3 (Linac 3) and the Low Energy Ion Ring (LEIR) at CERN prepare ion beams to be injected in the Proton Synchrotron (PS) and for the subsequence accelerator chain. Beam stoppers consist of a material block in vacuum that rests out of the beam line during beam operation. When an ion beam at energies of a few tens of MeV/n hits the material block heat is shallowly deposited in the block reaching only hundreds of micrometers through-thickness. This heat is the result of the heat transferred from the ion beam momentum, ionization and nuclear interaction processes between beam and matter [1]. For safely designing beam stoppers the material block must withstand the thermal gradients induced by the beam-matter interaction
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