The next generation magnetic spectrometer in space, AMS-100, is designed to have a geometrical acceptance of 100 m 2 sr and to be operated for at least ten years at the Sun–Earth Lagrange Point 2. ...Compared to existing experiments, it will improve the sensitivity for the observation of new phenomena in cosmic rays, and in particular in cosmic antimatter, by at least a factor of 1000. The magnet design is based on high temperature superconductor tapes, which allow the construction of a thin solenoid with a homogeneous magnetic field of 1 Tesla inside. The inner volume is instrumented with a silicon tracker reaching a maximum detectable rigidity of 100 TV and a calorimeter system that is 70 radiation lengths deep, equivalent to four nuclear interaction lengths, which extends the energy reach for cosmic-ray nuclei up to the PeV scale, i.e. beyond the cosmic-ray knee. Covering most of the sky continuously, AMS-100 will detect high-energy gamma-rays in the calorimeter system and by pair conversion in the thin solenoid, reconstructed with excellent angular resolution in the silicon tracker.
The variety of isotopes in cosmic rays allows us to study different aspects of the processes that cosmic rays undergo between the time they are produced and the time of their arrival in the ...heliosphere. In this paper, we present measurements of the isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be), and 10B/11B in the range 0.2-1.4 GeV of kinetic energy per nucleon. The measurements are based on the data collected by the Alpha Magnetic Spectrometer, AMS-01, during the STS-91 flight in 1998 June.
We present prototype modules for a tracking detector consisting of multiple layers of 0.25
mm diameter scintillating fibers that are read out by linear arrays of silicon photomultipliers. The module ...production process is described and measurements of the key properties for both the fibers and the readout devices are shown. Five modules have been subjected to a 12
GeV/
c proton/pion testbeam at CERN. A spatial resolution of
50
μ
m
and light yields exceeding 20 detected photons per minimum ionizing particle have been achieved, at a tracking efficiency of more than 98.5%. Possible techniques for further improvement of the spatial resolution are discussed.
The primary proton spectrum in the kinetic energy range 0.2 to 200 GeV was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS–91 at an altitude of 380 km. The complete ...data set combining three shuttle attitudes and including all known systematic effects is presented.
Leptons in near earth orbit Ambrosi, G.; Ao, L.; Arefiev, A. ...
Physics letters. B,
06/2000, Letnik:
484, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The lepton spectra in the kinetic energy ranges 0.2 to 40 GeV for e
− and 0.2 to 3 GeV for e
+ were measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS–91 at altitudes ...near 380
km. From the origin of the leptons two distinct spectra were observed: a higher energy spectrum and a substantial second spectrum with positrons much more abundant than electrons. Tracing leptons from the second spectra shows that most of these leptons travel for an extended period of time in the geomagnetic field and that the e
+ and e
− originate from two complementary geographic regions.
Performance of the AMS-02 transition radiation detector Doetinchem, Ph.v.; Fopp, S.; Karpinski, W. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2006, Letnik:
558, Številka:
2
Journal Article
Recenzirano
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For cosmic particle spectroscopy on the International Space Station the AMS experiment will be equipped with a Transition Radiation Detector (TRD) to improve particle identification. The TRD has 20 ...layers of fleece radiator with Xe/CO
2 proportional-mode straw-tube chambers. They are supported in a conically shaped octagon structure made of CFC-Al-honeycomb. For low power consumption VA analog multiplexers are used as front-end readout. A 20 layer prototype built from final design components has achieved proton rejections from 100 to 2000 at 90% electron efficiency for proton beam energies up to 250
GeV with cluster counting, likelihood and neural net selection algorithms.
DC–DC conversion powering for the CMS tracker at SLHC Feld, L.; Jussen, R.; Karpinski, W. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2011, Letnik:
628, Številka:
1
Journal Article
Recenzirano
Odprti dostop
A tracker powering scheme based on DC–DC converters close to the detector modules can supply more power through thinner cables. This will allow to satisfy the increased power demands of tracking ...systems at the SLHC. This article describes the development of DC–DC converters for upgrades of the CMS pixel and tracking systems and addresses system integration issues.
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