presented by a.b. galvin stereo swg noaa boulder, co 22 march 2004 plastic activities
TRANSCRIPT
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PLASTICPLASTIC
Presented by A.B. Galvin
STEREO SWG
NOAA
Boulder, Co
22 March 2004
PLASTIC Activities
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PLASTICPLASTICData Plan Activities
• Data file naming and formatting conventions are being formulated (graduate student available until May 2004)
• VHO, SSC and IMPACT representatives have been contacted
• Expected Beacon Mode Data contribution is unchanged from previous submissions
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PLASTICPLASTICStructural Model
• Fit Check on S/C
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PLASTICPLASTICPLASTIC SUBSYSTEMS
Entrance System
Time of Flight Chamber
Electronics Box
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PLASTICPLASTICTOF Chamber and EBox
Flight Model TOF Chamber, EBox systems are still in fabrication.
Mechanical parts (UNH, MPE, U Kiel):> 1200 machined parts required 94% of parts have been fabricated/platedEM calibration results incorporated into ion optics
Electrical Assembly (UNH, MPE):Continued population of PWBsASIC packaging looking at alternative company
ACTEL programmingAll updates from EM testing completedCurrently checking SWEEP table implementation
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PLASTICPLASTICEntrance System
• Construction contract (Contraves Space) nearing completion
• FM1 & FM2 delivered to University of Bern (Nov 2003 & Jan 2004, respectively)
• Entrance System FM1 & FM2 testing underway at UBern
FM1 Entrance System Testing University of Bern
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PLASTICPLASTICEntrance System Sections
Wide Angle Partition(Suprathermal Ions)
Electrostatic Analyzer (E/Q selection, UV suppression)
Solar Wind Sector:
Proton ChannelMain Channel(Polar Angle Deflectors)
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PLASTICPLASTICEntrance System Characterization
• Analyzer Constants: Main Channel WAP Proton (S-Channel)• Deflection Constants• UV Suppression• Main Gating Capability• HV Capacity
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PLASTICPLASTIC
• UV Suppression verified
• Partial discharge tests successfully completed
• Thermal vacuum and vibration tests successfully completed
• Preliminary ion optics calibrations give expected results
• Cable harness rebuilt
Entrance System FM 1
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PLASTICPLASTICPLASTIC Entrance SystemCASYMS Test Set-Up (UBern)
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PLASTICPLASTICPolar AngleWAP, Main and Proton-Channel
Beta center
( °)
Beta FWHM
( °)
WAP +0.5 3.2
Main Channel
-0.25 1.9
Proton -Channel
+0.37 0.37
WAP beta scan(V_ ESA=181.2V, theta = -120,
E/ q=3keV/ e)
0,0
1000,0
2000,0
3000,0
4000,0
5000,0
6000,0
7000,0
8000,0
-4 -3 -2 -1 0 1 2 3 4
beta (deg)
SS
L c
ps l
ess
backgro
un
d
Main Channel beta scan(V_ ESA=180V, theta = +60)
0,0
1000,0
2000,0
3000,0
4000,0
5000,0
6000,0
7000,0
8000,0
-3 -2 -1 0 1 2 3
beta (deg)
SSL c
ps less
backgro
und
S-Channel 2nd beta scan(V_ ESA=177.4V, V_ SCO-L=-919.9V,
V_ SCI -U=-815.0, theta = +60)
0,0
100,0
200,0
300,0
400,0
500,0
600,0
-0,5 0 0,5 1beta (deg)
SSL c
ps
less
back
gro
und
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PLASTICPLASTICESA Voltage ScanWAP and Main Channel
WAP V_ ESA scan(beta = -0.46, theta = -120)
0,0
1000,0
2000,0
3000,0
4000,0
5000,0
6000,0
7000,0
8000,0
160 165 170 175 180 185 190 195 200
ESA +/ - Voltage
SS
L c
ps less b
g
Main Channel V_ ESA scan(beta = -0.24, theta = +60)
0,0
1000,0
2000,0
3000,0
4000,0
5000,0
6000,0
7000,0
- 195 - 190 - 185 - 180 - 175 - 170 - 165
ESA +/ - Voltage
SSL c
ps less b
g
ESA
Voltage
Voltage 3keV/e(Volts)
Energy Res.(FWHM)
Analyzer constant(eV/e V-1)
Active Area(cm2)
WAP 182 7 % 8.24 0.891
Main Channel
180 6 % 8.33 0.548
SSL
SSLactive
electrodes
kin
electrode
t
n
t
nA
Vq
E
k
Electrodes difference Voltage
Charge per Energy
: Beam Flux (Hz/cm2)
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PLASTICPLASTIC
Energy Voltage for 3keV/e Energy Resolution theta°Tuning (Volts) (Voltage FWHM)
FM1 EQM FM1 EQMelectrode MeasurementMeasurement MeasurementMeasurement Simulations
S- SCO-L -920 -870 N/A 10% 11%Channel SCI-U -815 -815 13,5% 12%
ESA ± 177,4 177 6,2% 5,8% 9,8%
Main ESA ± 180 179,7 N/A 6% 5,8% 6,5% 60Channel
WAP ESA ± 182 182,3 N/A 7% (-120°)6.3% (-120°) 7% -120 6.7% (-30°) -30
Analyzer Constant Active Area
(eV/e V-1) (cm2)FM1 EQM FM1 EQM
electrode MeasurementMeasurement Simulations MeasurementMeasurement Simulations
S- SCO-L 3,26 3,45 3,329 2,15E-03 3,07E-03Channel SCI-U 3,68 3,68 3,803 2,10E-03 4,05E-03
ESA ± 8,46 8,47 8,344 1,51E-03 3,27E-03 6,00E-04estimation
Main ESA ± 8,33 8,35 8,127 0,548 0,715 1,400Channel
WAP ESA ± 8,24 8,23 8,127 0,891 0,944 1,680
Summary of Entrance FM1 ion beam measurements
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PLASTICPLASTICSummary of Entrance FM1 ion beam measurements
Taken for Ar+ beta center beta FWHMbeam 3 keV/e (°) (°)
FM1 EQM FM1 EQMMeasurement Measurement Geometry MeasurementMeasurement Geometry
S- +0.37° +0.47° -0.039 +0.37° 0.4° 0.36° (FM1)Channel (FM1) Simulations
0.0 (EQM) 0.55°Main -0.25° +0.86° N/A 1.9° 1-2 ° 2.9°Channel
WAP 0.5° -0.4° N/A 3.2° 3.5° -5°/+6°
slope (V) duckbill deflection constant(° V-1) (° keV/e V-1)
FM1 EQM FM1 EQMMeasurement Measurement Simulations MeasurementMeasurement Simulations
S- 0,0389 0,0384 - 0,1167 0,1152 0,0981Channel
Main 0,0426 0,0429 - 0,1278 0,127842 0,125Channel
WAP N/A N/A N/A N/A N/A N/A
Note that beam position is known to ~1o
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PLASTICPLASTICIon Beam Test Summary
Analyzer constants according to simulations E/q selection according to simulations Angle selection according to simulations Active Area according to simulations
Entrance System achieves the required values and constants
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PLASTICPLASTICEntrance System Test - Partial Discharge
• All electrodes verified to 130% flight operational level
• Exception ESA-I to 125%
• Entrance System HV operation verified
• Remaining task to verify re-built and mounting cable harness
• All electrodes verified to 130% flight operational level!!
• Entrance System HV operation verified
Flight Model 1
Flight Model 2
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PLASTICPLASTICEntrance System UV Suppression
• Solar UV can generate spurious detector counts.
• Carbon-foil
• MCPs
PLASTIC requires a suppression factor SF ~ 108-109 in order to limit the detector UV noise to ~ 1 count/s
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PLASTICPLASTICUV Suppression
Serration Multiple
Bounce CuS surface
Isotropic scattering
absorption
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PLASTICPLASTICUV Suppression
CalibrationsMefisto laboratory
(University of Bern)9/9/2003 - 27/2/2004UV sourceSSL detector: 3 MCPsvacuum chamber
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PLASTICPLASTICUV calibration results
-angle variationall at = 49°
FM1 count rate higher by 2.1 – 3.0 than EQM count rate. FM2 count rate is approx. the same as EQM count rate.
Beta variation of EQM & FM1 & FM2
0
10
20
30
40
50
60
-5 -4.5 -4 -3.5 -3
Beta
c/s
c/s EQM
c/s FM1
c/s FM2
Alpha variation of EQM & FM1 & FM2
0
200
400
600
800
1000
19 24 29 34 39 44 49
Alpha
c/s
c/s EQM*
c/s FM1
c/s FM2
α-angle variationEQM at β = -3.8°FM1 at β = -4.0°FM2 at β = -4.0°
FM1 count rate higher by 1.6-2.8 than EQM count rate. FM2 count rate is approx. the same as EQM count rate.
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PLASTICPLASTICUV Suppression Summary
• CuS exhibited imperfections - accepted pending PD & UV tests
• Suppression factor 1.3x109 (SFEQM 4x109)
Flight Model 1
Flight Model 2
• High quality CuS coating
• Suppression factor 2.4x109
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PLASTICPLASTICDetectors in the PLASTIC Instrument
Entrance System
Time of FlightSection
MCP detector mounting
SSD detector frame
Signal Board (Anodes)
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PLASTICPLASTICDetectors in the PLASTIC Instrument
Entrance System
Time of FlightSection
MCP detector mounting
SSD detector frame
Signal Board (Anodes)
MCP Detection Plane
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PLASTICPLASTICDetectors in the PLASTIC Instrument
Entrance System
Time of FlightSection
MCP detector mounting
SSD detector frame
Signal Board (Anodes)
SSD Detection Plane
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PLASTICPLASTICDetectors in the PLASTIC Instrument
Entrance System
Time of FlightSection
MCP detector mounting
SSD detector frame
Signal Board (Anodes)
Anode Detection Plane
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PLASTICPLASTICDetector Status
• Large MCPs
• Small MCPs• SWS SSD Detectors (spares due coming month)
• Aux SSD Detectors (spares due coming month)
• Resistive Anode Material
Received: