PSSC Space Instrument 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

OverviewOverview 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 cm 2 ), energy range (~130 keV)

Ion source Ionization of neutral gas by electron impact Ions are collimated and accelerated (~10keV) by electrostatic lenses. Electron gun Ion trajectory simulation Blue line: Ion trajectory, mass=1, Red, green line: Potential contour Ring electrodes: 8000V ~ 0

Mass 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 -V B Ion trajectory simulation Green line: Mass 32, Blue line: Mass 28 V=+/-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 expander AC voltages (~1 kHz, ~200V) applied to deflectors scan the beam Decelerated by mesh electrodes. Ring electrodes collimate to a parallel beam. Ground 2.5kVBeam 3keV Deflector AC +/-200V

Beam accelerator 64 ring shaped electrodes connected via 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 simulation Green line: Mass 32, Blue line: Mass 28 V=+/-21 V, B=0.3T, Initial acceleration: 3kV, Main acceleration 130kV

Beam 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 turntable

System Control Diagram

SummarySummary 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 work Integrate and test the control software Components test Clean room extension

Vacuum chamber Main experiment chamber – 100 cm diameter x 150 cm –3 x Torr 3-axis turntable to control instrument position and beam angle will be placed within.

System Control Diagram turnt able contr oller Mats usad a HVPS VME busNIM amp. (slot) count er discri. chamber particle instrume nt turntable I/F Spell man HVPS isol ati on ion source ion bea m WL AN Farad ay Cup display Ion source control window Faraday- cup window HV/turntabl e/data window PC LabVi ew US B RS4 22 VM E I/F GPI B WL AN DA C

Rikkyo Univ. clean room Class 10000

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

Newly constructed laminar flow clean room