Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userMuon Acceleration to 750 GeV in the Tevatron Tunnel for a 1.5 TeV mu+ mu- Collider
230
0
0.0
(
0
)
Ask ChatGPT about the research
No Arabic abstract
Muon acceleration from 30 to 750 GeV in 72 orbits using two rings in the 1000m radius Tevatron tunnel is explored. The first ring ramps at 400 Hz and accelerates muons from 30 to 400 GeV in 28 orbits using 14 GV of 1.3 GHz superconducting RF. The ring duplicates the Fermilab 400 GeV main ring FODO lattice, which had a 61m cell length. Muon survival is 80%. The second ring accelerates muons from 400 to 750 GeV in 44 orbits using 8 GV of 1.3 GHz superconducting RF. The 30 T/m main ring quadrupoles are lengthened 87% to 3.3m. The four main ring dipoles in each half cell are replaced by three dipoles which ramp at 550 Hz from -1.8T to +1.8T interleaved with two 8T fixed superconducting dipoles. The ramping and superconducting dipoles oppose each other at 400 GeV and act in unison at 750 GeV. Muon survival is 92%. Two mm copper wire, 0.28mm grain oriented silicon steel laminations, and a low duty cycle mitigate eddy current losses. Low emittance muon bunches allow small aperatures and permit magnets to ramp with a few thousand volts. Little civil construction is required. The tunnel exists.
rate research
Read More
In the framework of the unified compositeness of leptons, quarks and Higgs bosons, the hidden local symmetry hat H_{loc}= SU(2)_Ltimes U(1)_Y with the heavy composite vector bosons, in addition to the SM gauge bosons, is briefly described. Supplementary hypothesis of the vector boson dominance (VBD) of the SM gauge interactions is considered. It is argued that this should produce the universal dominant residual interactions of the SM composite particles, i.e., all of the fermions and Higgs bosons. Restrictions on the universal residual fermion-fermion, fermion-boson and boson-boson interactions due to the VBD are investigated. Manifestations of the residual interactions at the 4 TeV mu+mu- collider are studied. It is shown that at 95% C.L. the unified substructure could be investigated at the collider in the processes mu+mu- to bar ff up to the compositeness scale O(150 TeV), in the processes mu+mu- to ZH, W+W- up to O(100 TeV) and in the process mu+mu- to ZHH up to O(40 TeV), which lie in the naturally preferable Deca-TeV region.
We discuss the technical feasibility, key machine parameters and major challenges of a 14 TeV c.m.e. muon-muon collider in the LHC tunnel. The luminosity of the collider is evaluated for three alternative muon sources - the PS synchrotron, one of a type developed by the US Muon Accelerator Program (MAP) and a low-emittance option based on resonant muon pair production. Project affordability is also discussed.
We investigate the sensitivity of the projected TeV muon collider to the gauged $L^{}_{mu}$-$L^{}_{tau}$ model. Two processes are considered: $Z$-mediated two-body scatterings $mu^+ mu^- to ell^+ ell^-$ with $ell = mu$ or $tau$, and scattering with initial state photon emission, $mu^+ mu^- to gamma Z,~Z to ell overline{ell}$, where $ell$ can be $mu$, $tau$ or $ u_{mu/tau}$. We quantitatively study the sensitivities of these two processes by taking into account possible signals and relevant backgrounds in a muon collider experiment with a center-of-mass energy $sqrt{s} = 3~{rm TeV}$ and a luminosity $L=1~{rm ab^{-1}}$. For two-body scattering one can exclude $Z$ masses $M^{}_{Z} lesssim 100~{rm TeV}$ with $mathcal{O}(1)$ gauge couplings. When $M^{}_{Z} lesssim 1~{rm TeV} <sqrt{s}$, one can exclude $g gtrsim 2times 10^{-2}$. The process with photon emission is more powerful than the two-body scattering if $M^{}_{Z} < sqrt{s}$. For instance, a sensitivity of $g simeq 4 times 10^{-3}$ can be achieved at $M^{}_{Z} = 1~{rm TeV}$. The parameter spaces favored by the $(g-2)^{}_{mu}$ and $B$ anomalies with $M^{}_{Z} > 100~{rm GeV}$ are entirely covered by a muon collider.
The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance Muon Accelerator (LEMMA) concept is presented. The positron beam, stored in a ring with high energy acceptance and low emittance, is extracted and driven to a multi-target system, to produce muon pairs at threshold. This solution alleviates the issues related to the power deposited and the integrated Peak Energy Density Deposition (PEDD) on the targets. Muons produced in the multi-target system will then be accumulated before acceleration and injection in the collider. A multi-target line lattice has been designed to cope with the focusing of both the positron and muon beams. Studies on the number, material and thickness of the targets have been carried out. A general layout of the overall scheme and a description is presented, as well as plans for future R&D.
A low-energy Muon Collider (MC) offers unique opportunities to study the recently found Higgs boson. However, due to a relatively large beam emittance with moderate cooling in this machine, large-aperture high- field superconducting (SC) magnets are required. The magnets need also an adequate margin to operate at a large radiation load from the muon decay showers. General specifications of the SC dipoles and quadrupoles for the 125 GeV c.o.m. Higgs Factory with an average luminosity of ~2x10**31 cm-2s-1 are formulated. Magnet conceptual designs and parameters are reported. The impact of the magnet fringe fields on the beam dynamics as well as the IR and lattice magnet protection from radiation are also reported and discussed.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
