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Chauvin, M., Friis, M., Jackson, M., Kawano, T., Kiss, M., Mikhalev, V., . . . Pearce, M. (2017). Calibration and performance studies of the balloon-borne hard X-ray polarimeter PoGO. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 859, 125-133.
Open this publication in new window or tab >>Calibration and performance studies of the balloon-borne hard X-ray polarimeter PoGO
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2017 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 859, 125-133 p.Article in journal (Refereed) Published
Abstract [en]

Polarimetric observations of celestial sources in the hard X-ray band stand to provide new information on emission mechanisms and source geometries. PoGO+ is a Compton scattering polarimeter (20-150 keV) optimised for the observation of the Crab (pulsar and wind nebula) and Cygnus X-1 (black hole binary), from a stratospheric balloon-borne platform launched from the Esrange Space Centre in summer 2016. Prior to flight, the response of the polarimeter has been studied with polarised and unpolarised X-rays allowing a Geant4-based simulation model to be validated. The expected modulation factor for Crab observations is found to be M-Crab = (41.75 +/- 0.85)%, resulting in an expected Minimum Detectable Polarisation (MDP) of 7.3% for a 7 day flight. This will allow a measurement of the Crab polarisation parameters with at least 5 sigma statistical significance assuming a polarisation fraction similar to 20% - a significant improvement over the PoGOLite Pathfinder mission which flew in 2013 and from which the PoGO+ design is developed.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2017
Keyword
X-ray, Polarisation, Compton scattering, Scientific ballooning, Crab, Cygnus X-1, Monte Carlo simulations
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-219572 (URN)10.1016/j.nima.2017.03.027 (DOI)000402464700018 ()
Note

QC 20171207

Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-07Bibliographically approved
Bruno, A., Adriani, O., Barbarino, G. C., Bazilevskaya, G. A., Bellotti, R., Boezio, M., . . . Zampa, N. (2017). Geomagnetically trapped, albedo and solar energetic particles: Trajectory analysis and flux reconstruction with PAMELA. Advances in Space Research, 60(4), 788-795.
Open this publication in new window or tab >>Geomagnetically trapped, albedo and solar energetic particles: Trajectory analysis and flux reconstruction with PAMELA
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2017 (English)In: Advances in Space Research, ISSN 0273-1177, E-ISSN 1879-1948, Vol. 60, no 4, 788-795 p.Article in journal (Refereed) Published
Abstract [en]

The PAMELA satellite experiment is providing comprehensive observations of the interplanetary and magnetospheric radiation in the near-Earth environment. Thanks to its identification capabilities and the semi-polar orbit, PAMELA is able to precisely measure the energetic spectra and the angular distributions of the different cosmic-ray populations over a wide latitude region, including geomagnetically trapped and albedo particles. Its observations comprise the solar energetic particle events between solar cycles 23 and 24, and the geomagnetic cutoff variations during magnetospheric storms. PAMELA's measurements are supported by an accurate analysis of particle trajectories in the Earth's magnetosphere based on a realistic geomagnetic field modeling, which allows the classification of particle populations of different origin and the investigation of the asymptotic directions of arrival.

Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
Cosmic-rays, Radiation belts, Albedo particles, Geomagnetic cutoff, Solar energetic particles
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-211588 (URN)10.1016/j.asr.2016.06.042 (DOI)000405975700005 ()2-s2.0-85002846984 (Scopus ID)
Funder
Swedish National Space BoardSwedish Research Council
Note

QC 20170815

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2017-08-15Bibliographically approved
Mikhailov, V. V., Adriani, O., Barbarino, G., Bazilevskaya, G. A., Bellotti, R., Boezio, M., . . . Zampa, N. (2017). Sharp increasing of positron to electron fluxes ratio below 2 GV measured by the PAMELA. Journal of Physics, Conference Series, 798(1), Article ID 012019.
Open this publication in new window or tab >>Sharp increasing of positron to electron fluxes ratio below 2 GV measured by the PAMELA
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2017 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 798, no 1, 012019Article in journal (Refereed) Published
Abstract [en]

Magnetic spectrometer PAMELA was launched onboard a satellite Resurs-DK1 into low-Earth polar orbit with altitude 350-600 km to study cosmic ray antiparticle fluxes in a wide energy range from ∼ 100 MeV to hundreds GeV. This paper presents the results of observations of temporal variations of the positron and electron fluxes in the 2006-2015. The ratio of the positron and electron fluxes below 2 GV shows sharp increasing since 2014 due to changing of the polarity of the solar magnetic field.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017
Keyword
Astrophysics, Cosmology, Electrons, Magnetic polarity, Orbits, Positrons, Earth polar orbit, Electron flux, Magnetic spectrometers, Solar magnetic fields, Temporal variation, Wide energy range, Cosmic rays
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-208027 (URN)10.1088/1742-6596/798/1/012019 (DOI)2-s2.0-85016239114 (Scopus ID)
Note

QC 20170602

Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02Bibliographically approved
Galper, A. M., Sparvoli, R., Adriani, O., Barbarino, G., Bazilevskaya, G. A., Bellotti, R., . . . Zampa, N. (2017). The PAMELA experiment: A decade of Cosmic Ray Physics in space. Journal of Physics, Conference Series, 798(1), Article ID 012033.
Open this publication in new window or tab >>The PAMELA experiment: A decade of Cosmic Ray Physics in space
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2017 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 798, no 1, 012033Article in journal (Refereed) Published
Abstract [en]

The PAMELA detector was launched on June 15 th of 2006 on board the Russian Resurs-DK1 satellite and during ten years of continuous data-taking it has observed very interesting features in cosmic rays, especially in the fluxes of protons, helium and electrons. Moreover, PAMELA measurements of cosmic antiproton and positron fluxes and positron-to-all-electron ratio have set strong constraints to the nature of Dark Matter. Measurements of boron, carbon, lithium and beryllium (together with the isotopic fraction) have also shed new light on the elemental composition of the cosmic radiation. Search for signatures of more exotic processes (such as the ones involving Strange Quark Matter) has also been pursued. Furthermore, over the years the instrument has allowed a constant monitoring of the solar activity and a prolonged study of the solar modulation, improving the comprehension of the heliosphere mechanisms. PAMELA has also measured the radiation environment around the Earth, and detected for the first time the presence of an antiproton radiation belt surrounding our planet. In this highlight paper PAMELA main results will be reviewed.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017
Keyword
Astrophysics, Carbon, Cosmology, Earth (planet), High energy physics, Positrons, Radiation belts, Solar energy, Continuous data, Elemental compositions, Heliospheres, Measurements of, Quark matter, Radiation environments, Solar activity, Solar modulation, Cosmic rays
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-208030 (URN)10.1088/1742-6596/798/1/012033 (DOI)2-s2.0-85016270621 (Scopus ID)
Note

QC 20170602

Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02Bibliographically approved
Dong, Y., Pearce, M., Ryde, F., Zhang, S. & et al., . (2016). Experimental verification of the HERD prototype at CERN SPS. In: Proceedings of SPIE: SPACE TELESCOPES AND INSTRUMENTATION 2016: ULTRAVIOLET TO GAMMA RAY: . Paper presented at Conference on Space Telescopes and Instrumentation - Ultraviolet to Gamma Ray, Edinburgh, SCOTLAND, JUN 26-JUL 01, 2016. SPIE - International Society for Optical Engineering.
Open this publication in new window or tab >>Experimental verification of the HERD prototype at CERN SPS
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2016 (English)In: Proceedings of SPIE: SPACE TELESCOPES AND INSTRUMENTATION 2016: ULTRAVIOLET TO GAMMA RAY, SPIE - International Society for Optical Engineering, 2016Conference paper, Published paper (Refereed)
Abstract [en]

The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads of the cosmic light house program onboard China's Space Station, which is planned for operation starting around 2020 for about 10 years. Beam test with a HERD prototype, to verify the HERD specifications and the reading out method of wavelength shifting fiber and image intensified CCD, was taken at CERN SPS in November, 2015. The prototype is composed of an array of 5∗5∗10 LYSO crystals, which is 1/40th of the scale of HERD calorimeter. Experimental results on the performances of the calorimeter are discussed.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2016
Keyword
3d imaging, Calorimeter, Cosmic ray, Dark matter, Gamma ray, ICCD, Shower, WLSF
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:kth:diva-202109 (URN)10.1117/12.2231804 (DOI)000387731500178 ()2-s2.0-85003633069 (Scopus ID)
Conference
Conference on Space Telescopes and Instrumentation - Ultraviolet to Gamma Ray, Edinburgh, SCOTLAND, JUN 26-JUL 01, 2016
Note

QC 20170217

Available from: 2017-02-17 Created: 2017-02-17 Last updated: 2017-02-17Bibliographically approved
Koldobskiy, S. A., Carlsson, P., Pearce, M., Zampa, N. & et al., . (2016). Features of re-entrant albedo deuteron trajectories in near Earth orbit with PAMELA experiment. In: INTERNATIONAL CONFERENCE ON PARTICLE PHYSICS AND ASTROPHYSICS (ICPPA-2015), PTS 1-4: . Paper presented at International Conference on Particle Physics and Astrophysics (ICPPA), Moscow, 2015. Institute of Physics (IOP).
Open this publication in new window or tab >>Features of re-entrant albedo deuteron trajectories in near Earth orbit with PAMELA experiment
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2016 (English)In: INTERNATIONAL CONFERENCE ON PARTICLE PHYSICS AND ASTROPHYSICS (ICPPA-2015), PTS 1-4, Institute of Physics (IOP), 2016Conference paper, Published paper (Refereed)
Abstract [en]

The results of trajectory reconstruction for re-entrant albedo deuteron fluxes obtained in the PAMELA experiment are presented in this work. PAMELA is an international experiment aimed on measurements of cosmic ray particle fluxes in wide energy range. In particular, analysis of PAMELA data gives possibility to identify deuterons. Classification of re-entrant albedo deuterons with energies from 70 to 400 MeV/nucleon depending on theirs reconstructed lifetimes and generation zones is presented here at first time.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016
Series
Journal of Physics Conference Series, 675
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-185740 (URN)10.1088/1742-6596/675/3/032007 (DOI)000372460100073 ()2-s2.0-84964777685 (Scopus ID)
Conference
International Conference on Particle Physics and Astrophysics (ICPPA), Moscow, 2015
Note

QC 20160426

Available from: 2016-04-26 Created: 2016-04-26 Last updated: 2016-11-22Bibliographically approved
Menn, W., Carlsson, P., Pearce, M., Voss, E. E. & et al., . (2016). H, He, Li and Be Isotopes in the PAMELA-Experiment. In: INTERNATIONAL CONFERENCE ON PARTICLE PHYSICS AND ASTROPHYSICS (ICPPA-2015), PTS 1-4: . Paper presented at International Conference on Particle Physics and Astrophysics (ICPPA), Moscow, 2015. Institute of Physics (IOP).
Open this publication in new window or tab >>H, He, Li and Be Isotopes in the PAMELA-Experiment
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2016 (English)In: INTERNATIONAL CONFERENCE ON PARTICLE PHYSICS AND ASTROPHYSICS (ICPPA-2015), PTS 1-4, Institute of Physics (IOP), 2016Conference paper, Published paper (Refereed)
Abstract [en]

On the 15th of June 2006, the PAMELA satellite-borne experiment was launched from the Baikonur cosmodrome and it has been collecting data since July 2006. The apparatus comprises a time-of-flight system, a silicon-microstrip magnetic spectrometer, a silicon-tungsten electromagnetic calorimeter, an anti-coincidence system, a shower tail counter scintillator and a neutron detector. The scientific objectives addressed by the mission are the measurement of the antiprotons and positrons spectra in cosmic rays, the hunt for antinuclei as well as the determination of light nuclei fluxes from hydrogen to oxygen in a wide energy range and with very high statistics. In this paper the identification capability for light nuclei isotopes using two different detector systems (Time-of-Flight and multiple dE/dx measurements in the calorimeter) and preliminary results of the isotopic ratios will be presented.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016
Series
Journal of Physics Conference Series, 675
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-185742 (URN)10.1088/1742-6596/675/3/032001 (DOI)000372460100067 ()2-s2.0-84964706568 (Scopus ID)
Conference
International Conference on Particle Physics and Astrophysics (ICPPA), Moscow, 2015
Note

QC 20160426

Available from: 2016-04-26 Created: 2016-04-26 Last updated: 2016-11-22Bibliographically approved
Adriani, O., Barbarino, G. C., Bazilevskaya, G. A., Bellotti, R., Boezio, M., Bogomolov, E. A., . . . Zampa, N. (2016). MEASUREMENTS OF COSMIC-RAY HYDROGEN AND HELIUM ISOTOPES WITH THE PAMELA EXPERIMENT. Astrophysical Journal, 818(1), Article ID 68.
Open this publication in new window or tab >>MEASUREMENTS OF COSMIC-RAY HYDROGEN AND HELIUM ISOTOPES WITH THE PAMELA EXPERIMENT
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2016 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 818, no 1, 68Article in journal (Refereed) Published
Abstract [en]

The cosmic-ray hydrogen and helium (H-1, H-2, He-3, He-4) isotopic composition has been measured with the satellite-borne experiment PAMELA, which was launched into low-Earth orbit on board the Resurs-DK1 satellite on 2006 June 15. The rare isotopes H-2 and He-3 in cosmic rays are believed to originate mainly from the interaction of high-energy protons and helium with the galactic interstellar medium. The isotopic composition was measured between 100 and 1100 MeV/n for hydrogen and between 100 and 1400 MeV/n for helium isotopes using two different detector systems over the 23rd solar minimum from 2006 July to 2007 December.

Keyword
astroparticle physics, cosmic rays
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-183634 (URN)10.3847/0004-637X/818/1/68 (DOI)000370370800068 ()2-s2.0-84959195031 (Scopus ID)
Funder
Swedish National Space BoardSwedish Research Council
Note

QC 20160319

Available from: 2016-03-19 Created: 2016-03-18 Last updated: 2017-11-30Bibliographically approved
Chauvin, M., Floren, H.-G. -., Jackson, M., Kamae, T., Kawano, T., Kiss, M., . . . Pearce, M. (2016). Observation of polarized hard X-ray emission from the Crab by the PoGOLite Pathfinder. Monthly notices of the Royal Astronomical Society, 456(1), L84-L88.
Open this publication in new window or tab >>Observation of polarized hard X-ray emission from the Crab by the PoGOLite Pathfinder
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2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 456, no 1, L84-L88 p.Article in journal (Refereed) Published
Abstract [en]

We have measured the linear polarization of hard X-ray emission from the Crab in a previously unexplored energy interval, 20-120 keV. The introduction of two new observational parameters, the polarization fraction and angle stands to disentangle geometrical and physical effects, thereby providing information on the pulsar wind geometry and magnetic field environment. Measurements are conducted using the PoGOLite Pathfinder - a balloon-borne polarimeter. Polarization is determined by measuring the azimuthal Compton scattering angle of incident X-rays in an array of plastic scintillators housed in an anticoincidence well. The polarimetric response has been characterized prior to flight using both polarized and unpolarized calibration sources. We address possible systematic effects through observations of a background field. The measured polarization fraction for the integrated Crab light curve is 18.4(-10.6)(+9.8) per cent, corresponding to an upper limit (99 per cent credibility) of 42.4 per cent, for a polarization angle of (149.2 +/- 16.0)degrees.

Place, publisher, year, edition, pages
Oxford University Press, 2016
Keyword
instrumentation: polarimeters, techniques: polarimetric, stars: neutron, pulsars: individual: the Crab pulsar
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-182840 (URN)10.1093/mnrasl/slv177 (DOI)000368010000018 ()2-s2.0-84959175886 (Scopus ID)
Note

QC 20160224

Available from: 2016-02-24 Created: 2016-02-23 Last updated: 2017-11-30Bibliographically approved
Adriani, O., Carlson, P., Pearce, M., Zampa, N. & et. al., . (2016). PAMELA's measurements of geomagnetic cutoff variations during the 14 December 2006 storm. Space Weather: The international journal of research and applications, 14(3), 210-220.
Open this publication in new window or tab >>PAMELA's measurements of geomagnetic cutoff variations during the 14 December 2006 storm
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2016 (English)In: Space Weather: The international journal of research and applications, ISSN 1542-7390, E-ISSN 1542-7390, Vol. 14, no 3, 210-220 p.Article in journal (Refereed) Published
Abstract [en]

Data from the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) satellite experiment were used to measure the geomagnetic cutoff for high-energy ( 80MeV) protons during the 14 December 2006 geomagnetic storm. The variations of the cutoff latitude as a function of rigidity were studied on relatively short timescales, corresponding to spacecraft orbital periods (approximate to 94 min). Estimated cutoff values were compared with those obtained by means of a trajectory-tracing approach based on a dynamical empirical modeling of the Earth's magnetosphere. We found significant variations in the cutoff latitude, with a maximum suppression of approximate to 7 degrees at lowest rigidities during the main phase of the storm. The observed reduction in the geomagnetic shielding and its temporal evolution were related to the changes in the magnetospheric configuration, investigating the role of interplanetary magnetic field, solar wind, and geomagnetic parameters. PAMELA's results represent the first direct measurement of geomagnetic cutoffs for protons with kinetic energies in the sub-GeV and GeV region.

Place, publisher, year, edition, pages
Blackwell Publishing, 2016
Keyword
Geomagnetic Cutoff, Magnetic Storms, Solar Energetic Particles
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-187378 (URN)10.1002/2016SW001364 (DOI)000374698800003 ()2-s2.0-84960369298 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20160523

Available from: 2016-05-23 Created: 2016-05-23 Last updated: 2017-11-30Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7011-7229

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