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

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)

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

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.

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

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.

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

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.

3 axis turntable3 axis turntable

System Control DiagramSystem Control DiagramSystem Control DiagramSystem Control Diagram

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

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.

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

Rikkyo Univ. clean roomRikkyo Univ. clean roomRikkyo Univ. clean roomRikkyo Univ. clean room

Class 10000

Beam profile monitor in Rikkyo’s system– MCP and weadge and

strip anode

Newly constructed laminar flow clean room