PLASTIC Operations Status
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Transcript of PLASTIC Operations Status
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PLASTIC Operations Status
Mark Popecki
UNHSTEREO Science Team Meeting, March 2007
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Status of Operations• All commanding is now done from the UNH POC, through the MOC at APL.
– Commanding is real-time, during passes– Most future commands will be sent as time-tag events before a pass
begins. • Exception: HV and table loads/readbacks.
• FM1 and FM2 are in stable states:– 20 kV PAC (acceleration between entrance system and carbon foils)– ~2700V MCP
• Entrance system is in full operation, sweeping:– Deflectors (steer ions from above or below horizontal plane)– ESA (concentric domes)– Small geometrical factor aperture (for high intensity solar wind H+)– Sweeping began January 18 (A) and January 19 (B), 2007.
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Status• Pulse height validity test
– PLASTIC measures:• Time of flight• Energy (pixellated SSDs)• Azimuthal direction (position from resistive anode & discrete anodes)
– Valid event condition:• (2) A non-SSD side pulse height event is valid if it has time-of-flight. Multiple
and absent positions are allowed.• (3) An SSD-side pulse height event is valid if it has time-of-flight, and no multi-
energy measurements.
• Full resolution rate in science mode: RA_Trig – Azimuthal direction rate
– Fastest counter, with average deadtime of ~2 microseconds
– Cadence: • One minute cycle - entrance system voltage sweep • Rate is reported on every deflection step for half of a sweep - 12.8 mS/step
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Planned Changes
• Approve and upload latest version of IDPU software:– Enables commandable starting step for full resolution rates
– Enables auto-latchup recovery
– Updates autonomous procedures for safing and restoration of entrance system for off-pointing and thruster operations
– Adds sequence counters that were missing in some data products
– Updates to Beacon mode software
– Improves monitoring of high voltage ramps
– Change sweeptable for IDPU moment calculations
• Modify the azimuth table to capture events whose positions are just outside the defined solar wind sector.
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Operations History
• PLASTIC startup went well after launch and outgassing period.
• PAC, MCP and SSD supplies operated without incident.
• Fixed ESA voltages were used initially to detect ions with energies >6 keV/e.– Prior to December 2006 SWT meeting
H+
Heavyions
ESA:≤±5kV
Deflectors:≤+3.1kV,≤+6.2kVSmall Aperture Tap
Small Aperture Main
+
-
PAC: ~ 20 kV
C-Foil
MCP: ~2.7kVSSDs: ~98V
Signal Board (ground)
EntranceSystem
Time of FlightHousing
e-
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Operations History
• First attempts at full entrance system operation brought down all high voltages.
– The high voltage control board was getting reset to zero setpoints.
– Testing in flight and on the EM resulted in a procedural workaround.
– All procedural changes moderate voltage increases at the beginning of a sweep:
• ESA voltage is increased in two steps at retrace, instead of one.• Deflector setpoints are explicitly set to zero during the entrance system
high voltage enabling procedure. • The maximum deflector voltage is limited to 2 kV in the first ESA step.
• The PAC was increased from 17kV to 20kV after sweeping was established.
• MCP voltages were adjusted to the present values.
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Azimuthal Determination: Bifurcation in Small Aperture
FM1 20070212 minutes 50-74Apid315_0_127_STA_L1_PLA_20070212_043_V07
79 keV/e 0.20 keV/e
Heavy ions in large aperture
Switch to small aperture
H+
SW
S
±22
de
g
• Azimuthal position with the small aperture is double-peaked
• Pre-launch calibration data was single-peaked.
• Roll test demonstrates that azimuth may be derived from the average position.
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Direction Finding TestSECCHI S/C A Roll: Feb. 20, 2007: 2.5 hours,
Stepped Roll
PLASTIC
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SECCHI S/C A Roll: RA Position, Main Channel
0
5
10
15
20
25
30
35
40
45
50
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (UT, Feb 20 2007/051)
RA Position (ch)
Peak ch Main Sec 0
Mean Peak Main ch Sec 0
FWHM Main ch Sec 0
Start of Roll
End of Roll
Secchi Stepped Roll on A Apid315_0_127_STA_L1_PLA_20070220_051_V08 roll.posstat
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SECCHI S/C A Roll: Deflection, Main Channel
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Dec 30 Jan 9Jan 19
PLASTIC Activities During SWAVES “Noise: Periods
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