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Measuring the Galactic Cosmic Ray Flux with the LISA Pathfinder Radiation Monitor
- Source :
- BASE-Bielefeld Academic Search Engine, Astropart.Phys., Astropart.Phys., 2018, 98, pp.28-37. ⟨10.1016/j.astropartphys.2018.01.006⟩, Astroparticle Physics, Recercat. Dipósit de la Recerca de Catalunya, instname, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), Astropart.Phys., 2018, 98, pp.28-37. 〈10.1016/j.astropartphys.2018.01.006〉
- Publication Year :
- 2017
-
Abstract
- © . This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ Test mass charging caused by cosmic rays will be a significant source of acceleration noise for space-based gravitational wave detectors like LISA. Operating between December 2015 and July 2017, the technology demonstration mission LISA Pathfinder included a bespoke monitor to help characterise the relationship between test mass charging and the local radiation environment. The radiation monitor made in situ measurements of the cosmic ray flux while also providing information about its energy spectrum. We describe the monitor and present measurements which show a gradual 40% increase in count rate coinciding with the declining phase of the solar cycle. Modulations of up to 10% were also observed with periods of 13 and 26 days that are associated with co-rotating interaction regions and heliospheric current sheet crossings. These variations in the flux above the monitor detection threshold (¿˜¿70¿MeV) are shown to be coherent with measurements made by the IREM monitor on-board the Earth orbiting INTEGRAL spacecraft. Finally we use the measured deposited energy spectra, in combination with a GEANT4 model, to estimate the galactic cosmic ray differential energy spectrum over the course of the mission.
- Subjects :
- Astrofísica
Pathfinder
Astrophysics::High Energy Astrophysical Phenomena
Flux
FOS: Physical sciences
Cosmic ray
Astrophysics
Radiation
01 natural sciences
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
Charging
GCR
GEANT4
LISA
Radiation Monitor
Astronomy and Astrophysics
0103 physical sciences
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
[ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Physics
Spacecraft
010308 nuclear & particles physics
Gravitational wave
business.industry
Astronomy
Nuclear & Particles Physics
0201 Astronomical And Space Sciences
Física::Astronomia i astrofísica [Àrees temàtiques de la UPC]
Physics::Space Physics
Heliospheric current sheet
business
Astrophysics - Instrumentation and Methods for Astrophysics
Noise (radio)
astro-ph.IM
Subjects
Details
- Language :
- English
- ISSN :
- 09276505
- Database :
- OpenAIRE
- Journal :
- BASE-Bielefeld Academic Search Engine, Astropart.Phys., Astropart.Phys., 2018, 98, pp.28-37. ⟨10.1016/j.astropartphys.2018.01.006⟩, Astroparticle Physics, Recercat. Dipósit de la Recerca de Catalunya, instname, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), Astropart.Phys., 2018, 98, pp.28-37. 〈10.1016/j.astropartphys.2018.01.006〉
- Accession number :
- edsair.doi.dedup.....df1e69e5689a9659940b057d01faeb96