Measuring the galactic cosmic ray flux with the LISA Pathfinder radiation monitor

Armano, M. et al. (2018) Measuring the galactic cosmic ray flux with the LISA Pathfinder radiation monitor. Astroparticle Physics, 98, pp. 28-37. (doi:10.1016/j.astropartphys.2018.01.006)

[img]
Preview
Text
157503.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

6MB

Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ward, Professor Henry and Robertson, Dr David and Korsakova, Dr Natalia and Perreur-Lloyd, Mr Michael and Killow, Dr Christian
Authors: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A.M., Danzmann, K., de Deus Silva, M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Finetti, N., Fitzsimons, E.D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C.J., Lobo, J.A., Lloro, I., Liu, L., Lopez-Zaragoza, J.P., Maarschalkerweerd, R., Mance, D., Meshskar, N., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P.W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D.I., Rivas, F., Russano, G., Slutsky, J., Sopuerta, C.F., Sumner, T., Texier, D., Thorpe, J.I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Weber, W.J., Wissel, L., Wittchen, A., and Zweifel, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astroparticle Physics
Publisher:Elsevier
ISSN:0927-6505
ISSN (Online):1873-2852
Published Online:31 January 2018
Copyright Holders:Copyright © 2018 Elsevier B.V.
First Published:First published in Astroparticle Physics 98: 28-37
Publisher Policy:Reproduced in accordance with the publisher copyright policy
Related URLs:

University Staff: Request a correction | Enlighten Editors: Update this record