Download Free Search For Time Dependent Fluctuations In Cosmic Ray Flux With The Ams 01 Detector And Construction Of The Ams 02 Detector Book in PDF and EPUB Free Download. You can read online Search For Time Dependent Fluctuations In Cosmic Ray Flux With The Ams 01 Detector And Construction Of The Ams 02 Detector and write the review.

The soalr activity is known to influence the cosmic-ray flux on earth up to energies of 50 GeV per nucleon. The AMS-01 detector, which was flown on board the NASA Space Shuttle "Discovery" in June 1998, is sensitive to the highest energy range of solar particle events. Systematic flux fluctuations for the main cosmic-ray components (protons, helium nuclei and electrons) have been searched in the energy range accessible to the AMS-01 detector (from 100 Mev per nucleon to 200 GeV per nucleon) for the time interval for which suitable AMS-01 data are available (from June 8 to June 12, 1998). Systematic variations of cosmic-ray flux have been observed in the energy range below the geomagnetic cutoff. The comparison to the geomagnetic activity of the time has shown a correlation between systematic flux decreases and magnetic distrurbances of solar origin.
Antimatter search results of the Alpha Magnetic Spectrometer (AMS) detector are presented. About 108 triggers were collected in the 1998 precursor flight onboard space shuttle Discovery. This ten day mission exposed the detector on a 51.7{sup o} orbit at an altitude around 350km. Identification of charged cosmic rays is achieved by multiple energy loss and time-of-flight measurements. Bending inside the 0.15T magnetic volume yields a measurement of the absolute value of the particle's rigidity. The supplemental knowledge of the sense of traversal identifies the sign of the charge. In the rigidity range 1
The Alpha Magnetic Spectrometer (AMS) is a particle detector installed on the International Space Station; it starts to record data since May 2011. The experiment aims to identify the nature of charged cosmic rays and photons and measure their fluxes in the energy range of GeV to TeV. These measurements enable us to refine the cosmic ray propagation models, to perform indirect research of dark matter and to search for primordial antimatter (anti-helium). In this context, the data of the first years have been utilized to measure the electron flux and lepton flux (electron + positron) in the energy range of 0.5 GeV to 700 GeV. Identification of electrons requires an electrons / protons separation power of the order of 104, which is acquired by combining the information from different sub-detectors of AMS, in particular the electromagnetic calorimeter (ECAL), the tracker and the transition radiation detector (TRD). In this analysis, the numbers of electrons and leptons are estimated by fitting the distribution of the ECAL estimator and are verified using the TRD estimator: 11 million leptons are selected and analyzed. The systematic uncertainties are determined by changing the selection cuts and the fit procedure. The geometric acceptance of the detector and the selection efficiency are estimated thanks to simulated data. The differences observed on the control samples from data allow to correct the simulation. The systematic uncertainty associated to this correction is estimated by varying the control samples. In total, at 100 GeV (resp. 700 GeV), the statistic uncertainty of the lepton flux is 2% (30%) and the systematic uncertainty is 3% (40%). As the flux generally follows a power law as a function of energy, it is important to control the energy calibration. We have controlled in-situ the measurement of energy in the ECAL by comparing the electrons from flight data and from test beams, using in particular the E/p variable where p is momentum measured by the tracker. A second method of absolute calibration at low energy, independent from the tracker, is developed based on the geomagnetic cutoff effect. Two models of geomagnetic cutoff prediction, the Störmer approximation and the IGRF model, have been tested and compared. These two methods allow to control the energy calibration to a precision of 2% and to verify the stability of the ECAL performance with time.
Nothing provided
Une recherche d'antimatière lourde (¦Z¦>2) avec le détecteur AMS-01, embarqué sur la navette spatiale Discovery en juin 1998, est présentée. L'analyse des données n'identifie aucun candidat d'antimatière acceptable parmi un échantillon de 1.65 x 105 noyaux avec 2
Parmi les événements observés, une trentaine sont compatibles avec les photons de haute énergie qui produisent une conversion dans la partie supérieure du détecteur.