A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250  GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena.

/pdf/first-result-from-the-alpha-magnetic-spectrometer-on-the-4uoy9ka4vy.pdf

First result from the Alpha Magnetic Spectrometer on the International Space Station: precision measurement of the positron fraction in primary cosmic rays of 0.5-350 GeV.

The Alpha Magnetic Spectrometer is a precision, large acceptance particle physics detector which was deployed on the International Space Station (ISS) in May 2011. It will be on the ISS for the entire lifetime of the Space Station of about 20 years. To date, the detector has collected over 24 billion cosmic ray events. Among the physics objectives of AMS are the search for an understanding of Dark Matter, Antimatter and the origin of cosmic rays as well as the exploration of new physics phenomena. This report presents an overview of the operations and performance of the AMS experiment on the ISS as well as the progress of the analysis of the data collected over one year of operations in space.

https://ams.nasa.gov/Documents/AMS_Publications/NASA-8Jul2013.pdf

The Alpha Magnetic Spectrometer on the International Space Station

The Alpha Magnetic Spectrometer (AMS-02) is a general purpose high energy particle detector which was successfully deployed on the International Space Station (ISS) on May 19, 2011 to conduct a unique long duration mission of fundamental physics research in space. Among the physics objectives of AMS are the searches for an understanding of Dark Matter, Anti-matter, the origin of cosmic rays and the exploration of new physics phenomena not possible to study with ground based experiments. This paper reviews the layout of the AMS-02 detector, tests and calibrations performed with the detector on the ground, and its performance on the ISS illustrated with data collected during the first year of operations in space.

/pdf/the-alpha-magnetic-spectrometer-on-the-international-space-39gxs1ggib.pdf

A thermal model of the Alpha Magnetic Spectrometer on the International Space Station (ISS) has been developed, and Thermal Desktop ® (with RadCAD ® ) and SINDA/FLUINT software have been used to calculate the effects of the operations of the ISS Main Radiators on AMS temperatures. We find that the ISS Starboard Main Radiator has significant influence on temperatures on the port side of AMS. The simulation results are used in AMS thermal control operations.

/pdf/thermal-conditions-on-the-international-space-station-4dyzv883fh.pdf

Thermal conditions on the International Space Station: Effects of operations of the station Main Radiators on the Alpha Magnetic Spectrometer

The Alpha Magnetic Spectrometer (AMS-02) is a state of the art cosmic ray magnetic detector operating on the International Space Station (ISS) since May 2011, performing a continuous, direct measurement of cosmic ray flux and composition in the rigidity range, 
$$R=pc/Ze$$

, 
$$O(1 \text {GV})-O(1 \text {TV})$$

. The large statistics collected during 9 years of operation, more than 
$$1.5\ 10^{11}$$

 particles, together with the excellent particle identification provided by the instruments, allow for the precise study of the spectra of all cosmic ray species (
$$p, He, Li, Be, B, C, N, O \dots $$

 and 
$$e^-$$

), and begins the exploration of the rare antimatter components (
$$\bar{p}, e^+, \bar{D}, \bar{^3He},\bar{^4He} \dots $$

), which can be used as probes to search for new physics phenomena. We review the results obtained from the data collected so far, the perspectives of the ongoing analyses and of the forthcoming 10 years of data taking on the ISS.

High precision cosmic ray physics with AMS-02 on the International Space Station

/pdf/electromagnetic-calorimeter-for-the-ams-02-experiment-2r1dftoh1s.pdf

Electromagnetic calorimeter for the AMS-02 experiment

The Electromagnetic Calorimeter (ECAL) of the AMS-02 experiment is a lead-scintillanting fibers sampling calorimeter characterized by high granularity that allows to image the longitudinal and lateral showers development, a key issue to provide high electron/hadron discrimination. The light collection system and the FE electronics are designed to let the calorimeter operate over a wide energy range from few GeV up to 1 TeV. A full-scale prototype of the e.m. calorimeter was tested at Cern in October 2001 using electrons and pions beams with energy ranging from 3 to 100 GeV. Effective sampling thickness, linearity and energy resolution were measured.

The AMS-02 electromagnetic calorimeter

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Electromagnetic calorimeter for the AMS-02 experiment

The AMS-02 electromagnetic calorimeter