AMS-02 is a high energy particle detector deployed in May 19, 2011 on board of the International Space Station (ISS) where it is expected to be in operation for the ISS lifetime of at least a decade. ...The main goal of AMS-02 is the detection of cosmic rays and gammas from the GeV to the TeV energy region to search for anti-matter, dark matter and understanding the origin of the cosmic rays. The AMS-02 time of flight (TOF) detector provides the trigger to experiment and allows precise measurements of the cosmic rays velocity and charge magnitude from hydrogen to iron and above. With the data set acquired during the first two and a half years of operation in space, a precise time-dependent calibration for time, velocity and charge measured by the TOF had been developed. The TOF calibration methods are described and the AMS-02 TOF performance in space is presented.
Following the decision to maintain the International Space Station (ISS) on orbit until at least 2020 (possibly until 2028) the AMS collaboration decided to correspondingly extend the lifetime of the ...experiment. Since the limited amount of helium used to cool the superconducting magnet allowed for only a limited run time of the experiment, a change from the superconducting magnet to the permanent magnet used in AMS-01 became necessary. Due to the lower magnetic field, to maintain the resolution the silicon tracker also had to be reconfigured with the installation of a silicon plane on the top of the experiment and a new plane above the electromagnetic calorimeter.
The Alpha Magnetic Spectrometer (AMS) is a high energy physics experiment on the board of the International Space Station (ISS). This paper presents the hardware and software facilities of Science ...Operation Center (SOC) at CERN. Data Production is built around production server - a scalable distributed service which links together a set of different programming modules for science data transformation and reconstruction. The server has the capacity to manage 1000 paralleled job producers, i.e. up to 32K logical processors. Monitoring and management tool with Production GUI is also described.
The Alpha Magnetic Spectrometer (AMS) is a high energy physics experiment installed and operating on board the International Space Station (ISS) since May 2011 and expected to last beyond 2024. The ...details of porting the AMS software to the IBM Blue Gene/Q Architecture are discussed. The performance of the AMS reconstruction and simulation software in that architecture is evaluated and compared to the performance obtained on Intel based architecture.
Computing Strategy of the AMS Experiment Choutko, V.; Egorov, A.; Eline, A. ...
Journal of physics. Conference series,
12/2015, Letnik:
664, Številka:
3
Journal Article
Recenzirano
Odprti dostop
The Alpha Magnetic Spectrometer (AMS) is a high energy physics experiment operating on board of the International Space Station (ISS). The detector was installed on ISS in May 2011 and is expected to ...continuously take cosmic rays data through Year 2024 and beyond. The computing strategy of the AMS experiment is discussed in the paper, including software design, data processing, data reconstruction and simulation, detector performance evaluation, and data production overview. In particular, parallelization of reconstruction and simulation of AMS data is discussed in detail.
The Alpha Magnetic Spectrometer 1 (AMS) has collected over 95 billion cosmic ray events since it was installed on the International Space Station (ISS) on May 19, 2011. The original science data ...collected by the detector are transferred to the Payload Operations Control Centre at CERN, and shared to the Science Operation Centre (SOC). SOC takes responsibilities to process the science data, including the format transformation, flight data reconstruction, and Monte-Carlo 2 (MC) simulation. The data produced by SOC are ready for detector performance evaluation and physics analysis. Different types of science data are processed by different procedures, some of the processing are done on SOC own computing facilities, and others by CERN-managed services, so it is important that all the processing procedures as well as the computing facilities and services are monitored. This paper presents the SOC monitoring tools and the integration with CERN monitoring infrastructure.
The Alpha Magnetic Spectrometer 1 (AMS) has collected over 95 billion cosmic ray events since it was installed on the International Space Station (ISS) on May 19, 2011. To cope with enormous flux of ...events, AMS uses 12 computing centers in Europe, Asia and North America, which have different hardware and software configurations. The centers are participating in data reconstruction, Monte-Carlo (MC) simulation 2/Data and MC production/as well as in physics analysis. Data production management system has been developed to facilitate data and MC production tasks in AMS computing centers, including job acquiring, submitting, monitoring, transferring, and accounting. It was designed to be modularized, light-weighted, and easy-to-be-deployed. The system is based on Deterministic Finite Automaton 3 model, and implemented by script languages, Python and Perl, and the built-in sqlite3 database on Linux operating systems. Different batch management systems, file system storage, and transferring protocols are supported. The details of the integration with Open Science Grid are presented as well.
The Alpha Magnetic Spectrometer (AMS) has collected over 95 billion cosmic ray events since it was installed on the International Space Station (ISS) on May 19, 2011. The AMS science data includes ...original flight data, reconstructed and simulated ones, as well as the metadata of all of them. The total data volume is more than 1000 TB per year of operation in average, and is now over 6200 TB. One of the major responsibilities of AMS Science Operation Centre (SOC) is the management of science data, including: to receive the original data collected by the detector, to store the data of different types/stages in corresponding places, to back data up, and to create/update metadata (index) for all the stored data. The data validation, the metadata design, and the ways to preserve the consistency between the data and the metadata are presented.
The Alpha Magnetic Spectrometer (AMS) is a high energy particle detector aboard the International Space Station. AMS precisely measures the fluxes of all cosmic-ray nuclei with charge from Z=1 to ...Z=28 and beyond. The AMS silicon tracker measures energy deposition of charged particles traversing over nine-layer silicon sensors, from L1 to L9. In this paper, the details of the AMS silicon tracker charge measurement method are presented. The obtained charge resolution of the AMS inner tracker (L2 to L8 combined) is 0.1 charge units for carbon, 0.15 charge units for silicon, and 0.3 charge units for iron nuclei.
Monte Carlo (MC) simulation production plays an important role in physics analysis of the Alpha Magnetic Spectrometer (AMS-02) experiment. To facilitate the metadata retrieving for data analysis ...among millions of database records, we developed a monitoring tool to analyse and visualize the production status and progress. In this paper, we discuss the workflow of the monitoring tool and present its features and technical details.
PDF
