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Lattice with Negative Momentum Compaction Variation for the High-Resolution Mode of the HESR

Yurij Senichev

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Abstract

The High Energy Storage Ring (HESR) of the FAIR project is planned to have two operating modes, high‐luminosity and high‐resolution. For the high‐resolution mode the antiproton beam with intensity ∼(1 ÷ 5)⋅1010 has to be cooled to an extremely small momentum spread 〈δ/p〉≈10−5 in the energy range 0.83 ÷ 14.1 GeV. To ensure the collective stability of the beam in the energy region γ ⩾ 3 with such parameters the only solution is a lattice with a negative momentum compaction factor. In addition, the lattice should be flexible for momentum compaction factor adjustment versus the beam energy to satisfy all requirements in the whole energy range.

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What this paper is about

The High Energy Storage Ring (HESR) of the FAIR project is planned to have two operating modes, high‐luminosity and high‐resolution. For the high‐resolution mode the antiproton beam with intensity ∼(1 ÷ 5)⋅1010 has to be cooled to an extremely small momentum spread 〈δ/p〉≈10−5 in the energy range 0.83 ÷ 14.1 GeV. To ensure the collective stability of the beam in the energy region γ ⩾ 3 with such parameters the only solution is a lattice with a negative momentum compaction factor. In addition, the lattice should be flexible for momentum compaction factor adjustment versus the beam energy to satisfy all requirements in the whole energy range.

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Available abstract

The High Energy Storage Ring (HESR) of the FAIR project is planned to have two operating modes, high‐luminosity and high‐resolution. For the high‐resolution mode the antiproton beam with intensity ∼(1 ÷ 5)⋅1010 has to be cooled to an extremely small momentum spread 〈δ/p〉≈10−5 in the energy range 0.83 ÷ 14.1 GeV. To ensure the collective stability of the beam in the energy region γ ⩾ 3 with such parameters the only solution is a lattice with a negative momentum compaction factor. In addition, the lattice should be flexible for momentum compaction factor adjustment versus the beam energy to satisfy all requirements in the whole energy range.

Key concepts: Physics, Compaction, Lattice (music), Momentum (technical analysis), Nuclear physics, Beam (structure), Optics, Materials science

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