The use of accelerated beams of electrons, protons or ions has furthered the development of nearly every scientific discipline. However, high-energy muon beams of equivalent quality have not yet been ...delivered. Muon beams can be created through the decay of pions produced by the interaction of a proton beam with a target. Such 'tertiary' beams have much lower brightness than those created by accelerating electrons, protons or ions. High-brightness muon beams comparable to those produced by state-of-the-art electron, proton and ion accelerators could facilitate the study of lepton-antilepton collisions at extremely high energies and provide well characterized neutrino beams
. Such muon beams could be realized using ionization cooling, which has been proposed to increase muon-beam brightness
. Here we report the realization of ionization cooling, which was confirmed by the observation of an increased number of low-amplitude muons after passage of the muon beam through an absorber, as well as an increase in the corresponding phase-space density. The simulated performance of the ionization cooling system is consistent with the measured data, validating designs of the ionization cooling channel in which the cooling process is repeated to produce a substantial cooling effect
. The results presented here are an important step towards achieving the muon-beam quality required to search for phenomena at energy scales beyond the reach of the Large Hadron Collider at a facility of equivalent or reduced footprint
.
The DO collaboration is completing production of a 793 000 channel silicon strip tracking system for the DO upgrade. The tracker consists of 768 ladder and wedge assemblies including both single- and ...double-sided detectors. The production process includes burn-in of electronics, mechanical assembly under coordinate measuring machines, wire bonding, repair of bad channels, detector burn-in, laser testing, and final assembly. We describe observed failure modes of the detectors, including microdischarge and lithography defects. We present results of the production and testing process and describe the anticipated performance of the detector. Lessons for future production of large-scale tracking systems are discussed.
Luminosity measurement in the L3 detector at LEP Brock, I.C.; Engler, A.; Ferguson, T. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/1996, Letnik:
381, Številka:
2
Journal Article
Recenzirano
Odprti dostop
One of the limiting factors in the determination of the electroweak parameters from cross section measurements of e
+e
− annihilation close to the Z pole is the precision of the luminosity ...measurement. The luminosity monitor of the L3 detector at LEP and the analysis of its data are described. Using a combination of a BGO calorimeter and a 3-layer silicon tracker, the absolute luminosity has been measured with an experimental precision of 0.08% in 1993 and 0.05% in 1994. The measurement relies on a detailed understanding of small-angle elastic e
+e
− (Bhabha) scattering from the experimental and theoretical point of view, as well as an excellent knowledge of the detector geometry.
The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam at a future ...neutrino factory or muon collider. The emittance is measured from an ensemble of muons assembled from those that pass through the experiment. A pure muon ensemble is selected using a particle-identification system that can reject efficiently both pions and electrons. The position and momentum of each muon are measured using a high-precision scintillating-fibre tracker in a 4 T solenoidal magnetic field. This paper presents the techniques used to reconstruct the phase-space distributions in the upstream tracking detector and reports the first particle-by-particle measurement of the emittance of the MICE Muon Beam as a function of muon-beam momentum.
Performance of the MICE diagnostic system Bogomilov, M.; Tsenov, R.; Vankova-Kirilova, G. ...
Journal of instrumentation,
08/2021, Letnik:
16, Številka:
8
Journal Article
A novel single-particle technique to measure emittance has been developed and used to characterise seventeen different muon beams for the Muon Ionisation Cooling Experiment (MICE). The muon beams, ...whose mean momenta vary from 171 to 281 MeV/
c
, have emittances of approximately 1.2–2.3
π
mm-rad horizontally and 0.6–1.0
π
mm-rad vertically, a horizontal dispersion of 90–190 mm and momentum spreads of about 25 MeV/
c
. There is reasonable agreement between the measured parameters of the beams and the results of simulations. The beams are found to meet the requirements of MICE.
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