Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Higgs Factory Muon Collider Superconducting Magnets and Their
  Protection Against Beam Decay Radiation   Low-energy medium-luminosity Muon Collider (MC) is being studied as a
possible Higgs Factory (HF). Electrons from muon decays will deposit more than
300 kW in superconducting magnets of the HF collider ring. This imposes
significant challenges to superconducting (SC) magnets used in the MC storage
ring (SR) and interaction regions (IR). The magnet designs are proposed which
provide high operating gradient and magnetic field in a large aperture to
accommodate the large size of muon beams due to low \b{eta}* as well as the
cooling system to intercept the large heat deposition from the showers induced
by decay electrons. Specific distribution of heat deposition in the lattice
elements MC SR requires large aperture magnets to accommodate thick high-Z
absorbers to protect the SC coils. Based on the developed MARS15 model and
intense simulations, a sophisticated radiation protection system was designed
for the collider SR and IR to bring the peak power density in the
superconducting coils below the quench limit and reduce the dynamic heat
deposition in the cold mass by a factor of 100. The system consists of tight
tungsten masks in the magnet interconnect regions and elliptical tungsten
liners in magnet aperture optimized for each magnet. It also reduces the
background particle fluxes in the collider detector.

29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci