36 research outputs found
Ultra-Fast Hadronic Calorimetry
Calorimeters for particle physics experiments with integration time of a few
ns will substantially improve the capability of the experiment to resolve event
pileup and to reject backgrounds. In this paper the time development of
hadronic showers induced by 30 and 60 GeV positive pions and 120 GeV protons is
studied using Monte Carlo simulation and beam tests with a prototype of a
sampling steel-scintillator hadronic calorimeter. In the beam tests,
scintillator signals induced by hadronic showers in steel are sampled with a
period of 0.2 ns and precisely time-aligned in order to study the average
signal waveform at various locations with respect to the beam particle impact.
Simulations of the same setup are performed using the MARS15 code. Both
simulation and test beam results suggest that energy deposition in steel
calorimeters develop over a time shorter than 2 ns providing opportunity for
ultra-fast calorimetry. Simulation results for an "ideal" calorimeter
consisting exclusively of bulk tungsten or copper are presented to establish
the lower limit of the signal integration window.Comment: 10 pages, 16 figures, accepted for publication in NIM
Muon stopping power and range tables 10 MeV-100 TeV
The mean stopping power for high-energy muons in matter can be described by âdE/dx = a(E) + b(E)E, where a(E) is the electronic stopping power and b(E) is the energy-scaled con-tribution from radiative processesâbremsstrahlung, pair production, and photonuclear interac-tions. a(E) and b(E) are both slowly-varying functions of the muon energy E where radiative effects are important. Tables of these stopping power contributions and continuous-slowing-down-approximation (CSDA) ranges (which neglect multiple scattering and range straggling) are given for a selection of elements, compounds, mixtures, and biological materials for incident kinetic en-ergies in the range 10 MeV to 100 TeV. Tables of the contributions to b(E) are given for the same materials
Radiation Shielding Analysis for the PIP-II Linac at Fermilab
The Proton Improvement Plan-II (PIP-II) [1] has been developed at Fermilab to
provide powerful proton beams to the laboratorys experiments. An 800-MeV
superconducting linear accelerator-a centerpiece of the project-is currently
under construction in Batavia, Illinois (USA). After completion, the
superconducting linac will be the starting point for the 1.2 MW (Phase 1) and
2.4-MW (Phase 2) proton beam that is needed for the Long-Baseline Neutrino
Facility (LBNF) at Fermilab [2]. Due to unavoidable loss of a fraction of the
beam in the accelerator components, a certain level of radiation will be
generated in the accelerator tunnel both during normal operation and at
accidents. This work deals with radiation shielding design for the accelerator
facility
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Radiation damage due to electromagnetic showers
Radiation-induced damage due to atomic displacements is essential to correctly predict the behavior of materials in nuclear reactors and at charged-particle accelerators. Traditionally the damage due to hadrons was of major interest. The recent increased interest in high-energy lepton colliders gave rise to the problem of prediction of radiation damage due to electromagnetic showers in a wide energy range--from a few hundred keV and up to a few hundred GeV. The report describes results of an electron- and positron-induced displacement cross section evaluation. It is based on detailed lepton-nucleus cross sections, realistic nuclear form-factors and a modified Kinchin-Pease damage model. Numerical data on displacement cross sections for various target nuclei is presented
ILCRoot Tracker and Vertex Detector Hits Response to MARS15 Simulated Backgrounds in the Muon Collider
Abstract Results from a simulation of the background for a muon collider, and the hits response of a silicon tracking detector to this backgroundare presented.The backgroundcausedbydecaysofthe750 GeV/ c beam ÎŒ + and ÎŒ â was simulated using the MARS15 program, which included the infrastructure of the beam line elements near the detector and the 10 â nozzles that shield the detector from this background. The ILCRoot framework, along with the Geant4 program, was used to simulate the hits response of the tracker and vertex silicon detectors to the muon-decay background remaining after the shielding nozzles. Results include the hit distributions in these detectors, the fractions of type-specific background particles producing these hits and illustrate the use of timing of the hits to suppress the muon beam background
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Muons and neutrinos at high-energy accelerators
Background levels in detectors and radiation problems at future colliders--whether pp, e{sup +}e{sup {minus}} or {mu}{sup +}{mu}{sup {minus}} are in large part determined by the presence of muons. Neutrinos from muon decay at muon colliders or storage rings are highly collimated and propagate outward within a narrowdisk in which significant radiation doses persist out to very large distances. This paper highlights physics models and Monte Carlo algorithms developed mainly for studying these problems as well as some typical results
Preliminary Report on the Study of Beam-Induced Background Effects at a Muon Collider
Physics at a multi-TeV muon collider needs a change of perspective for the
detector design due to the large amount of background induced by muon beam
decays. Preliminary studies, based on simulated data, on the composition and
the characteristics of the particles originated from the muon decays and
reaching the detectors are presented here. The reconstruction performance of
the physics processes and has been investigated
for the time being without the effect of the machine induced background. A
preliminary study of the environment hazard due to the radiation induced by
neutrino interactions with the matter is presented using the FLUKA simulation
program
Code intercomparison and benchmark for muon fluence and absorbed dose induced by an 18-GeV electron beam after massive iron shielding
In 1974, Nelson, Kase, and Svenson published an experimental investigation on
muon shielding using the SLAC high energy LINAC. They measured muon fluence and
absorbed dose induced by a 18 GeV electron beam hitting a copper/water beam
dump and attenuated in a thick steel shielding. In their paper, they compared
the results with the theoretical mode ls available at the time. In order to
compare their experimental results with present model calculations, we use the
modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the
experimental setup and run simulations. The results will then be compared
between the codes, and with the SLAC data.Comment: 10 pp. Presented paper at the 12th Workshop on Shielding Aspects of
Accelerators, Targets and Irradiation Facilities, SATIF-12, Fermilab, April
28-30, 201
The Case for a Muon Collider Higgs Factory
We propose the construction of a compact Muon Collider Higgs Factory. Such a
machine can produce up to \sim 14,000 at 8\times 10^{31} cm^-2 sec^-1 clean
Higgs events per year, enabling the most precise possible measurement of the
mass, width and Higgs-Yukawa coupling constants.Comment: Supporting letter for the document: "Muon Collider Higgs Factory for
Smowmass 2013", A White Paper submitted to the 2013 U.S. Community Summer
Study of the Division of Particles and Fields of the American Physical
Society, Y. Alexahin, et. al, FERMILAB-CONF-13-245-T (July, 2013