1. MIPA status report (Miniature Ion Precipitation Analyzer)
David McCann, Swedish Institute of Space Physics, Kiruna, Sweden
Prepared for GSST Workshop, Gothenburg

2. MIPA basic features Three major sub-units: 1. Electrostatic deflector
4. deflector high voltage plates
2. Electrostatic analyzer
5. analyzer high voltage plate
11. UV attenuation structure
3. time-of-flight unit
6. time-of-flight cell
7. start surface
8. stop surface
9. start ccem*
10. stop ccem*
* Ceramic Channel Electron Multiplier
Parameter
Value
Energy range
10eV – 15keV
Energy resolution
∆E/E 7%
Viewing angle
9° x 180°
Angular resolution
9° x 22.5°
Mass resolution
6 mass groups
Energy elevation cycle 8s
Geometric factor
0.14 cm2 sr eV

3. Status
A TM (Technological Model) of MIPA is fully integrated and set up for tests.
HV stability tests has been performed without encountering any problems.
A fully functional prototype of the HVPS has been integrated and will be used for calibration tests of the TM.
Layout of the time-of-flight electronics is on-going and will be concluded within the next few weeks.
A fully functional rough prototype has been integrated for use on the TM.
Thermal tests of the CCEM’s have been concluded.
Noise levels do not exceed acceptable levels.

4. MIPA TM Left: i. View of TM set-up in vacuum chamber at IRF.
ii. The box under the sensor will be used for storing
the hvps and time-of-flight electronics boards.
Right:
i. View of TM without sensor cover.

5. HVPS
View of the HVPS.
Dimensions:
~75g
120x60x30 mm

6. TOF electronics
Picture of the time-of-flight electronics board (rough prototype) set up in the vacuum chamber at IRF.
Dimensions (of flight board):
~80g
120x60x15 mm

7. UV trap
Left:
View of the base structure with deflector grid and UV rejection unit integrated.
Right:
Focused view of the UV rejection plates.
The unit comprise 14 blackened aluminum plates. Interplate spacing is ~0.2mm with plates roughly 0.1mm thick

8. Status comments MIPA is well on schedule.
We will be able to conclude tests and calibration of the TM during oct/nov 2005.
As of now, no critical action items are identified.