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Optimising a small satellite for hard X-ray polarisation studies of gamma ray Bursts.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Gamma ray bursts (GRBs) originate from extremely energetic extra-galactic events, and

much is still unknown about them. Whereas the energy and time structure of GRBs

have been studied extensively the past years, only a few polarisation measurements have

been made on their initial, prompt emission. Determining the polarisation of GRBs will

therefore provide a means to test proposed emission models. A small satellite (SPHiNX)

has been proposed to measure the polarisation of X-rays from GRBs.

The performance of the detector is optimised using Monte Carlo simulations of a typical

GRB source, in order to produce a more efficient design. First, the effect on the performance

when varying individual parameters is studied, and then when using several

changes in conjunction for the optimisation. The new design improves the primary gure

of merit, the minimum detectable polarisation (MDP), by

7% over the initial design, and

improves the secondary gure of merit, the effective area, by 22%.

Abstract [sv]

Gammablixtar (GRBs) härrör från extremt energiska skeenden i andra galaxer, och ännu

är mycket okänt kring dem. Emedan energi- och tidsstrukturen hos GRBs har studerats

utförligt under senare år, har endast ett fåtal mätningar genomförts på polarisationen hos

den initiella strålningen. Att fastställa hur polarisationen hos GRBs ser ut är därför ett

sätt att testa föreslagna utstrålningsmodeller. En liten satellit (SPHiNX) har föreslagits

för att mäta polarisationen i röntgenstrålar från GRBs.

Detektorns prestanda opimeras genom att simulera GRB-strålning, så att en effektivare

design kan tas fram. Först undersöks hur de individuella parametrarna påverkar prestandan,

och sedan används sammantagna ändringar för att optimera utseendet. Den

slutgiltiga designen förbättrar det primära godhetstalet, den minsta detekterbara polarisationen

(MDP), med

7% jämfört med den ursprungliga designen, och förbättrar det

sekundära godhetstalen, den effektiva arean, med 22%.

 

Place, publisher, year, edition, pages
2014. , 30 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-149677OAI: oai:DiVA.org:kth-149677DiVA: diva2:740888
Supervisors
Available from: 2014-08-26 Created: 2014-08-26 Last updated: 2014-08-26Bibliographically approved

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