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A Rocket Based Detector for Imaging
Auroral X-Ray Emissions
Anders Groth Helland
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Problembeskrivelse
• Energetisk elektronnedbør
• Øker mengden NO i atmosfæren– IR radiator, energibudsjett– Spiser ozon
• Setter opp store strømmer
• Genererer røntgenstråling
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ESPRIT(Engineering/Scientific Project for
Research and International Teamwork)
• Samarbeidsprosjekt mellom– Pennsylvania State University (PSU) (USA)– Universitetet i Bergen (UiB)– Universitetet i Oslo (UiO)
– Høyskolen i Narvik (HiN)
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Energetisk Elektronnedbør
• Høy solaktivitet → Mye nedbør• Vekselvirker med atmosfæren
– Ionisering
– Elektriske strømmer
– Dissosiering
– Eksitering
– Oppvarming av nøytrale gasser
– Kjemiske endringer
– Bremsestråling
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Røntgenstrålingens vekselvirkninger i atmosfæren
• Fotoelektrisk effekt
• Compton spredning
• Parproduksjon
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• Dominerende prosesser i forskjellige energiområder i luft
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Fjernmåling av røntgen
• Observere store områder
• “Synlig” i dagslys
• Gir diskret elektronenergier
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Metoder
• Ballong
• Rakett
• Satellitt
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Rakett
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Design av røntgenkamera
• Opprinnelig skisse • ESPRIT skisse
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• Opprinnelig skisse • ESPRIT skisse
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Flytskjema
Detectors&
Preamps
Detectors&
Preamps ShaperShaper IDID
ADCADC
BufferBuffer FIFOFIFO
BiasBias
Power Converter
Power Converter
HousekeepingBatteries
HousekeepingBatteries
PCMPCM
TMTM User Interface
(PC)
User Interface
(PC)
EOC
BitClock
BitClock
WordPulse
WordPulse G
ate
Gate
TimerTimer
FramePulse
FramePulse
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Forforsterker
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Bias
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Brakett for kretskort
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Montering
• Brakett • Plassering
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Detektorer• Kadmium Sink Tellurid (CdZnTe) • Pixel størrelse: 10mm x 10mm x 3 mm• Trenger ingen kjøling• God effektivitet fra lave energier til over 100 keV
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Elektronikk• Forforsterker
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Elektronikk• Bias
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Elektronikk• Forsinkelselinjepulsformingsforsterker
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Elektronikk• Triggerkrets
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Elektronikk
• Peak and Hold
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Elektronikk
• Grensesnitt
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Redundans
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Testing av detektor og forforsterker
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Testing av detektor og forforsterker
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Linearitets test
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Kalibrering
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Kalibrering
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Solid State Elektron Detektorer
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PCM
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ESPRIT“Our mission is scientific but our goals are educational”
• Hovedmålet for prosjektet var:– Gi studenter kunnskap om et fullskala internasjonalt
rakettprogram
– Gjøre in situ målinger i den øvre del av mesosfæren, og nedre del av termosfæren
– Gjøre målinger av rakettens oppførsel
– Analysere data
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Eksperimenter
• Penn State (USA)– Plasma Frequency Probe– Langmuir Probe– Magnetometer– Sun Sensor– Photometer Camera og Noctilucent Cloud
Experiment
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Eksperimenter• Universitetet i Bergen
– Røntgenkamera– Solid State Elektron Detektorer– Sol/horisont sensor
• Universitetet i Oslo– Akselerometer eksperiment
• Høyskolen i Narvik– Aerosol eksperiment
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ESPRIT Raketten
• To-trinns Terrier-Improved Orion rakettmotor
• Apogeum : 169045 m
• Nyttelast: 194 kg
• Totalvekt : 1482 kg
• Lengde med motorer: 10 m
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Integrering
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Oppskytningen
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Bakkebaserte instrumenter
• AIRIS
• EISCAT
• Magnetometer
• Radar ALWIN
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Elektronmålinger
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Røntgenmålinger i hver detektor
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Røntgenmålinger i sektorer
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Konklusjon
• Alle detektorer fungerte under rakettflukten
• Alle instrumentene på ESPRIT fungerte
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