Abstract
Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex up to 2040 and its scientific infrastructure through projects complementary to the existing and possible future colliders. Within the Conventional Beam Working Group (CBWG), several projects for the M2 beam line in the CERN North Area were proposed, such as a successor for the COMPASS experiment, a muon programme for NA64 dark sector physics, and the MuonE proposal aiming at investigating the hadronic contribution to the vacuum polarisation. We present integration and beam optics studies for 100 – 160 GeV/c muon beams as well as an outlook for improvements on hadron beams, which include RFseparated options and low-energy antiproton beams and radiation studies for high intensity beams. In addition, necessary beam instrumentation upgrades for beam particle identification and momentum measurements are discussed.
Highlights
The emphasis of the Conventional Beam Working Group (CBWG) studies lies on the large number of fixed target proposals for the North Area which comprises two surface halls, EHN1 and EHN2, and an underground cavern, ECN3
This paper will present the proposals made at the M2 beam line [1], which delivers high-energy and high-intensity muon and hadron beams towards the experimental hall, EHN2, as well as low-intensity electron beams for detector calibrations
A future QCD facility [2] at M2 which is the successor of COMPASS [3] with proposals for a proton radius measurement and Deep Virtual Compton Scattering (DVCS)/Deep Virtual Meson Production (DVMP) measurements
Summary
The emphasis of the CBWG studies lies on the large number of fixed target proposals for the North Area which comprises two surface halls, EHN1 and EHN2, and an underground cavern, ECN3. The MuonE experiment [4] which intends to measure the hadronic vacuum polarisation as the main contributor to the uncertainty of the gμ-2 measurement. It requires a parallel 150 GeV/c muon beam with maximal intensity of 5x107/s. Phase 1 requires a parallel muon beam of 100-160 GeV/c with intensity in the order of 105-106 μ/s and a space of 20 m. For the muon program of all experiments the case of simultaneous installation and even operation of at least two experiments was studied, for the latter under the assumption that the beam momentum and intensity required will be the same for all experiments under consideration.
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