The Alpha Magnetic Spectrometer (AMS) is a particle physics experiment for use on the International Space Station (ISS). At the heart of the detector will be a large superconducting magnet cooled to ...a temperature of 1.8 K by 2500 liters of superfluid helium. The magnet and cryogenic system are currently under construction by Space Cryomagnetics Ltd of Culham, England. This paper describes the cryogenic system for the magnet, designed for the unusual challenges of operating a superconducting system in space. Results from experiments demonstrating some of the new techniques and devices developed for the magnet cryogenics are also presented.
A compact Cosmic Ray demonstrator for physics outreach programs Kim, K.S.; Commichau, S.C.; Viertel, G.M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2005, Letnik:
553, Številka:
3
Journal Article
Recenzirano
A compact Cosmic Ray demonstrator for physics outreach programs is described. The detector consists of an array of 121 plastic scintillator blocks (each 11×11×100
mm
3) read out by avalanche photo ...diodes. The data output comprises a large LED display and a standard USB interface for further data processing.
A study of the dimensional stability of the AMS silicon tracker Burger, W.J.; Perrin, E.; Alcaraz, J. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2003, Letnik:
512, Številka:
3
Journal Article
Recenzirano
The Alpha Magnetic Spectrometer (AMS) is designed as an independent module for installation on the International Space Station (ISS) for an operational period of 3 years. The AMS is the first cosmic ...ray spectrometer equipped with a large area silicon tracker
(>5
m
2)
. A preliminary version of the detector was flown on the NASA space shuttle
Discovery during June 2–12, 1998. Results for the dimensional stability of the silicon tracker planes based on the flight data, and the metrology data recorded before and after the flight, are presented.
The Alpha Magnetic Spectrometer (AMS) is a particle physics experiment based on the International Space Station (ISS). At the heart of the detector is a large superconducting magnet, cooled to a ...temperature of 1.8 K by superfluid helium. The magnet and cryogenic system are currently under construction by Space Cryomagnetics Ltd of Culham, England. This paper describes the current status of the design and manufacture of the magnet system-including test results from the fourteen superconducting coils-and outlines the remaining work required to complete the project.
The absolute muon flux between 20 and 3000 GeV is measured with the L3 magnetic muon spectrometer for zenith angles ranging from 0° to 58°. Due to the large exposure of about 150 m2sr d, and the ...excellent momentum resolution of the L3 muon chambers, a precision of 2.3% at 150 GeV in the vertical direction is achieved.
The ratio of positive to negative muons is studied between 20 and 500 GeV, and the average vertical muon charge ratio is found to be 1.285±0.003(stat.)±0.019(syst.).
Solar Orbiter is a Sun-observing mission led by the European Space Agency, addressing the interaction between the Sun and the heliosphere. It will carry ten instruments, among them the X-ray imaging ...spectrometer STIX. STIX will determine the intensity, spectrum, timing, and location of thermal and accelerated electrons near the Sun through their bremsstrahlung X-ray emission. This report gives a brief overview of the STIX scientific goals and covers in more detail the instrument design and challenges.
Experience with the L3 vertex drift chamber at LEP Anderhub, H.; Beissel, F.; Betev, B. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2003, Letnik:
515, Številka:
1
Journal Article
Recenzirano
The vertex drift chamber of the L3 Experiment at LEP, based on the
time expansion principle, was in operation from the start-up of LEP in 1989 until the shutdown of LEP in 2000. The gas mixture used ...was 80% CO
2 and 20% i-C
4H
10 at a pressure of
1200
mbar
. We present the design of the chamber, the infrastructure and the performance during the 11 years of operation. The total radiation received on the anode wires was
∼10
−4
C/
cm
. No degradation of the anode pulse amplitude, wire efficiencies and resolution was observed for the whole running period.
A channel photomultiplier with a scintillator faceplate Grimm, O; Kim, G.N; Lee, M.W ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2003, Letnik:
513, Številka:
3
Journal Article
Recenzirano
A channel photomultiplier has been constructed using a YAP(Ce) scintillator as an entrance window. First results of performance measurements show a significant improvement of the photoelectron yield ...over the same scintillator coupled to conventional borosilicate-glass windows.
Scalar partners of quarks and leptons, predicted in supersymmetric models, are searched for in e+e− collisions at centre-of-mass energies between 192 and 209 GeV at LEP. No evidence for any such ...particle is found in a data sample of 450 pb−1. Upper limits on their production cross sections are set and lower limits on their masses are derived in the framework of the Minimal Supersymmetric Standard Model.
High-precision tracking and charge selection with silicon strip detectors for relativistic ions has been investigated using a
12C beam of
1.5
GeV/u
at GSI with prototype modules developed for the AMS ...tracker. The ionization energy loss is measured and compared to the Landau–Vavilov theory for ions of charge number up to
Z=6. The linearity in
Z
2 is examined. The capability to distinguish different
Z values based on the ionization energy loss is evaluated. The spatial resolution of the silicon strip detectors is investigated for carbon ions. The angular distribution of multiple Coulomb scattering is studied with lead absorbers. The results are compared to the Molière theory and the Gaussian approximation of GEANT calculations.
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