Abstract
The Search for Hidden Particles (SHiP) experiment proposal at CERN demands a dedicated dipole magnet for its scattering and neutrino detector. This requires a very large volume to be uniformly magnetized at B>1.2 T, with constraints regarding the inner instrumented volume as well as the external region, where no massive structures are allowed and only an extremely low stray field is admitted. In this paper we report the main technical challenges and the relevant design options providing a comprehensive design for the magnet of the SHiP Scattering and Neutrino Detector.
Highlights
In this paper we report the main technical challenges and the relevant design options providing a comprehensive design for the magnet of the Search for Hidden Particles (SHiP) Scattering and Neutrino
The Beam Dump Facility (BDF) where SHiP operates is well described in ref. [3]: the most upstream BDF part is a proton target followed by a 5 m long hadron absorber
The detector system immediately downstream of the muon shield is optimised both for recoil signatures of hidden sector particle scattering and for neutrino physics. It is based on a hybrid detector with a concept similar to what was developed by the OPERA Collaboration [5] with alternating layers of nuclear emulsion films with high-density ν-target plates and electronic trackers
Summary
The design of the SHiP SND magnet follows the need for a significantly large, uniformly magnetized volume, in order to accommodate the ν-target and the spectrometer trackers. In particular the magnet yoke, beside its fundamental magnetic role (increasing efficiency, homogenizing and straightening up the field) and the mechanical one (contrasting the strong magnetic expanding force acting on the coil), is expected to sufficiently shield the field outside the magnet Such a requirement strongly affect the magnet design constraints and goals. At CERN, experimental magnets of comparable or even higher power consumption (e.g. LHCb [7,8,9] is 4.2 MW) were designed resistive to favour a much easier operation In this specific case, the CES will have to be replaced every few weeks and this will require easy human accessibility, certainly more difficult in presence of helium and of a cryogenic infrastructure. Internal volume (detectors + ancillary equipment) overall external size internal volume temperature reference field (internal volume) spatial field homogeneity (internal volume) temporal field stability (internal volume) maximum external stray field
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