The Alpha Magnetic Spectrometer (AMS-01) has successfully performed in a precursor flight in June 1998. The experiment is scheduled for a 3-year operation on the International Space Station (ISS) in ...the year 2003. For the ISS flight, the completion of the tracker as well as a major upgrade of the detector (AMS-02) is in progress. In this contribution, we present results from the AMS-01 silicon tracker construction and describe the organization of the assembly for phase 2. Given the large scale of this silicon detector, the involvement of private industries in the construction is addressed.
Accurate measurements of under cutoff proton fluxes in the energy range 0.07–9.1 GeV have been performed with the Alpha Magnetic Spectrometer (AMS) at altitudes of 370–390 km in the geographic ...latitude interval ±51.7°. A clear transition from a Stably Trapped population typical of the Inner Van Allen belts, in the region of the South Atlantic Anomaly (SAA), to a Quasi‐Trapped population in the regions underneath the Van Allen belts outside the SAA is observed. The flux maps as a function of the canonical adiabatic variables L, αo, and energy E are presented and discussed.
Charge determination of nuclei with the AMS-02 silicon tracker Alpat, B.; Ambrosi, G.; Azzarello, Ph ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2005, Letnik:
540, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The silicon tracker of the AMS-02 detector measures the trajectory in three dimensions of electrons, protons and nuclei to high precision in a dipole magnetic field and thus measures their rigidity ...(momentum over charge) and the sign of their charge. In addition, it measures the specific energy loss of charged particles to determine the charge magnitude. Ladders from the AMS-02 tracker have been exposed to ion beams at CERN and GSI to study their response to nuclei from helium up to the iron group. The longest ladder,
72
×
496
mm
2
, verified in the tests contains 12 sensors. Good charge resolution is observed up to iron.
Accurate measurements of electron and positron fluxes in the energy range 0.2–10 GeV have been performed with the Alpha Magnetic Spectrometer (AMS) at altitudes of 320–390 km in the geographic ...latitude interval ±51.7°. We focus on the fluxes measured in the regions nearby the South Atlantic Anomaly, defined by the local magnetic values of the magnetic field B (0.21 ≤ B ≤ 0.26 G) at the altitude of AMS. A clear transition from the Stably Trapped population typical of the Inner Van Allen belts to Quasi‐Trapped population in the regions underneath the Van Allen belts is observed. The high energy observations demonstrate the relatively higher abundance of positrons in the Inner Van Allen belts, for both the Stably Trapped and the Quasi‐Trapped populations. The flux maps as a function of the canonical adiabatic variables L, αo are presented for the interval 0.95 < L < 3, 0° < αo < 90° for electron energies below 10 GeV and positrons energies below 3 GeV. The results are compared with existing data at lower energies.
The design of the high precision microstrip silicon tracker for the Alpha Magnetic Spectrometer experiment (AMS) is presented. We emphasize features of the silicon tracker which make it suitable for ...a space born experiment and for equipping large active areas.
Accurate measurements of under cutoff proton, electron, and positron fluxes in the energy range 0.07 ÷ 9.1 GeV have been performed with the Alpha Magnetic Spectrometer at altitudes of 370 ÷ 390 km in ...the geographic latitude interval ±51.7°. The flux maps as a function of the canonical adiabatic variables L, αo, and energy E are presented and discussed.
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.
Substantial fluxes of protons and leptons with energies below the geomagnetic cutoff have been measured by the AMS experiment at altitudes of 350–390 km, in the latitude interval ±51.7°. The ...production mechanisms of the observed trapped fluxes are investigated in detail by means of the FLUKA Monte Carlo simulation code. All known processes involved in the interaction of the cosmic rays with the atmosphere (detailed descriptions of the magnetic field and the atmospheric density, as well as the electromagnetic and nuclear interaction processes) are included in the simulation. The results are presented and compared with experimental data, indicating good agreement with the observed fluxes. The impact of the secondary proton flux on particle production in atmosphere is briefly discussed.
Diamond devices have now become ubiquitous in the LHC experiments, finding applications in beam background monitoring and luminosity measuring systems. This sensor material is now maturing to the ...point that the large pads in existing diamond detectors are being replaced by highly granular tracking devices, in both pixel and strip configurations, for detector systems that will be used in Run II at the LHC and beyond. The RD42 collaboration has continued to seek out additional diamond manufacturers and quantify the limits of the radiation tolerance of this material. The ATLAS experiment has recently installed, and is now commissioning a fully-fledged pixel tracking detector system based on diamond sensors. Finally, RD42 has recently demonstrated the viability of 3D biased diamond sensors that can be operated at very low voltages with full charge collection. These proceedings describe all of these advances.
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