PSSC Space Instrument Laboratory
description
Transcript of PSSC Space Instrument Laboratory
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PSSC Space Instrument PSSC Space Instrument Laboratory Laboratory PSSC Space Instrument PSSC Space Instrument Laboratory Laboratory
• Plasma instrument calibration system provides an ion beam of energy range up to 130keV/charge in a clean room
• To develop new space plasma instruments in PSSC
• To offer calibration facility to other institutes’ instruments for upcoming missions. E.g. ERG and SCOPE
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OverviewOverviewOverviewOverview
To obtain the relationship between count rate and particle distribution function, the instrument response to known beam energy and incident angle is measured
beam area (>50 cm2), energy range (~130 keV)
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Ion sourceIon sourceIon sourceIon source• Ionization of neutral gas by
electron impact • Ions are collimated and
accelerated (~10keV) by electrostatic lenses.
Electron gun
Ion trajectory simulationBlue line: Ion trajectory, mass=1,Red, green line: Potential contourRing electrodes: 8000V ~ 0
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Mass spectrometerMass spectrometerMass spectrometerMass spectrometer• Mass separation is done by
a crossed electric field and magnetic field (ExB) in a 90 deg. cylindrical configuration (R=120 mm, gap 6 mm).+V
-VB
Ion trajectory simulationGreen line: Mass 32, Blue line: Mass 28V=+/-21 V, B=0.3T, Initial acceleration: 3kV
• Permanent magnets of 0.1 T and 0.3 T are selected depending on particle mass range.
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Beam expanderBeam expanderBeam expanderBeam expander
• AC voltages (~1 kHz, ~200V) applied to deflectors scan the beam
• Decelerated by mesh electrodes. • Ring electrodes collimate to a
parallel beam.
Ground
2.5kV Beam 3keV
DeflectorAC +/-200V
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Beam acceleratorBeam acceleratorBeam acceleratorBeam accelerator
64 ring shaped electrodes connectedvia resisters are set in the insulated tube to form a uniform field.
Ions are accelerated in an insulated tube by a potential drop (~130kV) between the beam expander and the drift tube.
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Ion trajectory simulationIon trajectory simulationIon trajectory simulationIon trajectory simulation
Ion trajectory simulation
Green line: Mass 32, Blue line: Mass 28
V=+/-21 V, B=0.3T, Initial acceleration: 3kV, Main acceleration 130kV
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Beam profile monitorBeam profile monitorBeam profile monitorBeam profile monitor
A movable 64 channel Faraday cup array (1 mm diameter, 8 mm depth, 2 mm spacing) is installed in front of the main chamber to monitor beam current and profile.
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3 axis turntable3 axis turntable
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System Control DiagramSystem Control DiagramSystem Control DiagramSystem Control Diagram
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SummarySummarySummarySummary
• We have established a laboratory equipped with a UHV vacuum chamber .
• Equipment such as HV power supplies, HV transformer and power-supply controllers are ready for installation.
• All the components of the beam line are manufactured and assembled.
• 3-axis turntable is installed.
Future workFuture work• Integrate and test the control software• Components test• Clean room extension
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Vacuum chamberVacuum chamberVacuum chamberVacuum chamber
• Main experiment chamber– 100 cm diameter x 150 cm – 3 x 10-7 Torr
• 3-axis turntable to control instrument position and beam angle will be placed within.
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System Control DiagramSystem Control DiagramSystem Control DiagramSystem Control Diagram
turntablecontroller
Matsusad
aHVPS
VME bus NIM
amp.
(slot) (slot)
counter discri.
chamberparticle
instrument
turntableI/F
SpellmanHVPS
isolatio
n
ion source
ion beam
WLAN
Faraday
Cup
display
Ion source control window
Faraday-cup window
HV/turntable/data window
PC
LabView US
B
RS422
VME
I/F
GPIB
WLAN
DAC
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Rikkyo Univ. clean roomRikkyo Univ. clean roomRikkyo Univ. clean roomRikkyo Univ. clean room
Class 10000
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Beam profile monitor in Rikkyo’s system– MCP and weadge and
strip anode
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Newly constructed laminar flow clean room