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Design of the High Energy Particle instrument for electrons (HEPe)for ERG mission
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

It is known that the Earth’s inner magnetosphere is the region where plasma particles have a wide range of energy from a few eV to 10 MeV. Though abundant in situ satellite measurements have been made in the past decades, the Earth’s inner magnetosphere is still an unclear region in terms of scientific investigation, particularly in the area of space plasma dynamics. However, this region is very important as a natural laboratory where high-energy particle acceleration can be directly measured in the dipolar field configuration, and also for human activities in space including space weather prediction as well. Therefore, a Japanese exploration mission termed Energization and Radiation in Geospace (ERG) was decided to be launched in the coming solar maximum around 2014 to observe the energetic particles with a wide range of energy, electromagnetic field and plasma waves simultaneously. Measurements of the high energy electrons are the key in this mission. A High Energy Particle instrument for electrons (HEPe) will be developed with Solid State Detector (SSD). HEPe has three assemblies with a field of view (FOV) of more than 60° x 10° each, and therefore can fulfill a 4π steradian coverage after one full spin period. The Single-sided Strip Silicon Detector (SSSD) is used so as to give the angular information of the particle with an angular resolution 10° x 10°. In order to cover the energy range from 50 keV to 2 MeV, two sensor heads with different geometry factors but similar structures are designed for each assembly, called HEPe- Low (50 keV – 1 MeV) and HEPe-High (700 keV – 2 MeV) respectively. A 12μm aluminum film plus a thin layer of SSSD is used in HEPe-Low for the discrimination of ion's contamination. A 250μm aluminum foil is used in HEPe-High for the elimination of the lower energy electrons. All the sensor heads are integrated in a cylinder shape and the total size is less than 200mm in diameter.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Earth’s inner magnetosphere, geospace, plasma/particle, detector, electron detector, solid state detector, ERG
Keyword [sv]
URN: urn:nbn:se:ltu:diva-48322ISRN: LTU-PB-EX--10/079--SELocal ID: 5c6b6e98-93d5-45c6-8fcb-62b79ade5d20OAI: diva2:1021663
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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