Abstract
Dedicated high-beta optics are used to make forward proton scattering measurements possible at the LHC. Following a short general introduction and history of special high-beta optics and running conditions, we describe the two types of special high-beta runs planned for 2018. A run at top energy at β y * = 90 m for elastic and diffractive scattering, and a low energy run to measure the rho-parameter in the Coulomb interference region.
Highlights
Introduction and Short HistoryMeasurements of low angle scattering processes at high energy colliders require special efforts, both on the machine and detector side
Special optics with high β∗ are used to obtain at the interaction points beams with small angular beam divergence, and on the detector side special movable “Roman Pot” detectors are used to record the scattered particles very close to the beam
These techniques were pioneered at the ISR and used at hadron colliders like the SppS and TEVATRON proton–antiproton colliders [1,2]
Summary
Measurements of low angle scattering processes at high energy colliders require special efforts, both on the machine and detector side. High β∗ > L∗ are used in special runs to reduce the beam divergence and make small scattering angles observable.
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