STEREO SWG May 2005 1

PLASTIC Status Report to the STEREO SWG

2 May 2005 Hamburg Planetarium

UNH: A.B. Galvin (PI), E. Moebius (Lead CoI), L. Kistler, M. Popecki, J. Quinn, M. Lee, C. Farrugia, S. Turco IM

UBern: L. Blush (Lead CoI), P. Bochsler, P. Wurz

U Kiel: R. F. Wimmer-Schweingruber (Lead CoI)

MPE: B. Klecker (Lead CoI)

NASA/GSFC: B. Thompson (Lead CoI)

STEREO A

STEREO A

STEREO B

STEREO B

STEREO SWG May 2005 2

Previous Status SummaryAt the time of the previous SWG (December 2004)

FM1 had completed:Full IntegrationUNH ion gun tests for functionality/performanceIPERVibration

FM1 was midway through performance testing and calibration at the U. Bern. Issue with TOF resolution and minor coding and table changes identified.

FM2 had finished:Entrance System integration, TOF chamber integration

FM2 was midway through reassembly and functional testing (after board coatings) of power supplies and digital electronics

IDPU s/w 2.6 development and testing was ongoing at UNH/UCB

STEREO SWG May 2005 3

Previously Reported IssueNASA requested change of venue for TV/TB tests:Testing was being planned at UBern facility for late January 2005

- To save about 2-3 weeks on the FM1 delivery schedule- To provide additional personnel support (to inhibit US costs and collateral schedule erosion to FM2)- To get early notice of any low temperature issues- UBern was providing TV MGSE support, radioactive sources

Resolution:Testing to take place at GSFC facilities

- Associated schedule erosion to FM1 accepted by Project- UNH fabricated new TV MGSE (facility specific)- FM1 refurbished for “noise reduction” prior to TV- Project shall provide 3 people to supplement PLASTIC personnel support in the TV/TB round-the-clock 3 week test schedule- Project will provide radioactive sources

STEREO SWG May 2005 4

Current Status

STEREO SWG May 2005 5

FM1 Calibration at Bern Dec04-Jan05• Deflection test - tipping instrument to known elevation angles

and sweeping the deflectors on the Main and S channels with at selected energies

• ESA E/Q and Angle response (“fish”) scans at selected energies and species

• MCP efficiency for selected MCP bias, species, energies, PAC

• Energy (SSD) data for selected E/Q and species• Test of ESA and DEFL sweeping in Main Channel• Test of ESA and DEFL sweeping in Proton Channel• Extended operation at -20 kV PAC• Test of Main/Proton Chn switching by Digital Electronics

(w/o IDPU) during sweeping• Limited azimuthal scans• Test of tables (SWEEP, RA, Classification)• Test of ACTEL coding• Quadrant 0 (Solar Wind Sector) fully covered. Quadrant 1,

2, 3 selectively covered• Rate linearity tests• Limited UV test in MEFISTO • Not accomplished: planned IDPU s/w testing with real

beams (S/W NR)

STEREO SWG May 2005 6

Results from FM1 Calibration

0

500

1000

1500

2000

2500

3000

0 10 20 30 40 50 60 70

RA Azimuth (ch, 0:63)

Cou

nts

40.8237.9835.1432.329.4626.2723.7820.5917.0414.210.657.816.031.77-4.26-9.59-13.85-18.11-20.6-25.92-33.38-38.7-46.16-53.97-62.13-68.53

Deg from Ctr SWS

0

5

10

15

20

25

30

35

40

45

50

-45 -35 -25 -15 -5 5 15 25 35 45

Beam Azimuth (deg)

Avera

ge R

A P

osi

tion (

ch)

FM1-041215-1726

0

5

10

15

20

25

30

35

-25 -20 -15 -10 -5 0 5 10 15 20 25

Instrument Elevation (UBe Beta, deg)

Ph

ysic

al D

efl

ecti

on

Ch

. Main Ch Avg Peak

Fitted Values

Main Channel Deflection

0

5

10

15

20

25

30

-20 -15 -10 -5 0 5 10 15

Instrument Elevation Angle (Beta, deg)

Ph

ysic

al D

eflecti

on

Peak c

h

S-Ch Avg Peak

S-ch Fit for -10 to +10 deg

S-Channel Deflection

Solar Wind Sector Flow Angle Measurement:

STEREO L1 requirement:Proton solar wind bulk flow angle determination to within +/- 10o

Polar Angle by electrostatic deflection: -10o to +15o FOV tested Main Chan 1.5o /step Proton Chan 1.3o /step

Azimuthal Angle by Resistive Anode: Full SWS 45o FOV tested 0.5o peak angle determination for FOV +/-(2o-15o). Peak determination better than a couple degrees inside FOV +/- 2o requires PHA.

STEREO SWG May 2005 7

Results from FM1 Calibration

200

210

220

230

240

250

260

270

280

290

300

0 200 400 600 800 1000

Input Rate (kHz)

TO

F Pe

ak

Channel (c

h)

30

32

34

36

38

40

42

44

46

48

50

TO

F Pe

ak

FWH

M (

ch)

Solar Wind Sector intensity measurement:

STEREO L1 requirement:

Proton solar wind density to +/-10 [30]%

High Rate Limits and Linearity:

Required: 625 kHz for a single rate

Measured: PHA data obtained at rates up to 840 kHz.

Resistive anode rate counter exhibits monotonic increase up to 840 kHz.

1

10

100

1000

10000

100000

1000000

0 200 400 600 800 1000

Beam Rate (kHz)

RA

_Tri

g &

Fit

(H

z)

1

10

100

1000

10000

100000

SF

0,

SF

R0

, S

SD

_SW

(H

z)

SFR0 RA_Trig Fit to RA_trig SF0 SSD_SW

STEREO SWG May 2005 8

Results from FM1 CalibrationSolar Wind Sector intensity

measurement:

STEREO L1 requirement:

Proton solar wind density to +/-10 [30]%

Measurement of Efficiency as a function of azimuthal angle

Main Channel Solar Wind Sector Response for Integrated instrument 2keV He+ PAC: 20 kV at -14 deg azim.

STEREO SWG May 2005 9

Results from FM1 Calibration

Channel Electrode Ana.Con. FWHMS-Channel SCO-L 3.19 10.40% 3.23 10.40% 3.25 10.64%

SCI-U 3.59 13.80% 3.68 13.20% 3.64 10.76%ESA 8.35 6.10% 8.46 6.34% 8.47 6.26%

MC ESA 8.26 6.10% 8.24 6.12% 8.26 6.48%WAP ESA 8.32 6.70% 8.25 6.77% 8.29 7.30%

FM1 FM2

-1000

0

1000

2000

3000

4000

5000

6000

7000

180 200 220 240 260 280

beta = -6

beta = -5

beta = -4

beta = -3

beta = -2

beta = -1

beta = 0

beta = 1

beta = 2

beta = 3

beta = 4

Solar Wind Sector E/Q measurement:

STEREO L1 requirement:

Proton solar wind speed to +/-10 [30] %, temperature +/-10 [30]%

Measurement of response over incident E/Q and incident angles

Measured from 300 eV/e to 60,000 eV/e

0

200

400

600

800

1000

1200

6480 6980 7480

60 keV He+ ESA V

Rate

(H

z,

60

keV

)

0

100

200

300

400

500

600

700

2160 2260 2360 2460 2560

20 keV He+ ESA V

Rate

(H

z,

20

keV

)

SF0: 60keV He+

SF0: 20 keV He+

STEREO SWG May 2005 10

Results from FM1 CalibrationSolar Wind Sector Species

measurement:

STEREO L1 requirement:

Species resolution for protons, alphas and selected major charge groups

Requires good E/Q, good Time-of-flight and reasonable E resolution

Species Measured at Bern facility:

H+, He+, He2+, O+, O2+, Ar+, Ar2+, Ar3+, Ar4+, Ar5+, Ar6+

Solid State Detector Energy: Measured 30-420 keV ions (Higher ion energies were not obtainable given E/Q limit and available charge states of beam)Results were nominal

Time-of-Flight:Measured from 10 – 250 nsTime of Flight determination nominal, but resolution was not acceptable. Proton efficiency also suffered.

Further testing at UNH determined that TOF inputs were picking up the 200 kHz syncing of the power supplies (nX50khz EMC Plan requirement). Shielding, filtering, and thresholds have been added to FM1 and FM2.

STEREO SWG May 2005 11

Improvement in TOF Resolution after Noise Reduction

• Noise reduction efforts improved time of flight resolution

• Lower noise allows lower threshold – improved proton efficiency

• Quadrant 0 spectra shown (solar wind sector)

• Data from UNH ion gun – ambient air beam

0

10

20

30

40

50

60

70

80

0 200 400 600 800 1000 1200

Time of Flight (ch)

Co

un

ts

Post-noise refurbishment: Q0, 50keV

Pre-noise refurbishment: Q0, 65 keV

PLA-FM1-050411-1630 post-refurb.PLA-FM1-041121-1444 pre-refurb

|Proton peak

|Water Group

0

5

10

15

20

25

30

2400 2500 2600 2700 2800 2900 3000 3100 3200 3300

MCP V

H+

TO

F F

WH

M (

gaus

sian

) Q

0

0

5

10

15

20

25

30

2400 2500 2600 2700 2800 2900 3000 3100 3200 3300

H+

TO

F F

WH

M (

gaus

sian

)

Q2,

3

Q0

Q2

Q3

15kV PAC, 35 keV air, TAC thresh Rs in external boxes

t ~3ns FWHM in SSD sectiont ~ 2ns FWHM in non-SSD section

STEREO SWG May 2005 12

Then and Now Species Determination

0

500

1000

1500

2000

2500

3000

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2Mass/charge (amu/e)

Fre

quency

0

50

100

150

200

250

300

60 keV H+ Pre-refurb

35 keV H+ Post-refurb.

0

50

100

150

200

250

300

350

400

450

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3

Mass (amu)

Qty

0

10

20

30

40

50

60

70

80

90

100

0.0

0

0.2

0

0.4

0

0.6

0

0.8

0

1.0

0

1.2

0

1.4

0

1.6

0

1.8

0

2.0

0

2.2

0

2.4

0

2.6

0

2.8

0

3.0

0

60 keV H+ Pre-Refurb.

35 keV H+ (air) Post-Refurb.

L1 Species Requirement now met.

STEREO SWG May 2005 13

FM1 Current Status-- All issues identified from performance testing corrected

(noise reduction, actel code changes for science product)-- Passed vibration-- More than 500 hours of trouble free testing in vacuum at operational voltages

STEREO SWG May 2005 14

FM1 Current Status-- All issues identified from performance testing corrected

(noise reduction, actel code changes for science product)-- Passed vibration-- More than 500 hours of trouble free testing in vacuum at operational voltages

Almost made it out the door in late March …

Flight board re-inspection in March 2005 raised QA issues regarding component placement on “SSD C” board. Board is part of the solid state detector electronics. Component placement on original flight boards was primarily motivated by crosstalk and LED response issues.

New boards “SSD C-3” and “SSD-4” built to replace “SSD C-1” (FM1) and “SSD C-2” (FM2) respectively. Components mounted differently. NASA inspectors very helpful. Additional board and flight parts purchased for SSD-4. Three week minimum turn around per board.

STEREO SWG May 2005 15

Replacement Board StatusReplacement board SSD C-3 integrated into FM1 almost two weeks ago.

New C-3 board does not respond properly in the integrated instrument.

Trouble shooting is continuing this week. Requires major disassembly and reassembly activities.

Access to board requires removal of entrance system, power supplies, and electronics box. Retest requires re-assembly.

This process has been done several times in past week. Concern about mechanical fatigue. Designing and fabricating new testing jig to allow more “lifelike” testing outside of instrument.

SSD Electronics

STEREO SWG May 2005 16

Other StatusFM2 has been fully assembled and gone through initial functional testing. -- performance looks good

-- noise reduction looks good-- no sensor problems identified, except for LVC voltage

regulation behavior at low (near zero) temperatures-- LVC returned to UCB for troubleshooting-- FM2 waiting in queue behind FM1 for SSD C board exchange

Project has put into place major resources to assist in the PLASTIC portion of the IMPACT/PLASTIC IDPU. Flight s/w build 2.7 is in “beta testing”. Build 2.8 may be ready to start beta testing later this week. Build 2.8 could potentially be validated by end of May. Build 3.0 (science) may be ready and partially validated by end of June. Can proceed with electrical integration of PLASTIC on the spacecraft with a validated build 2.8.

All testing with IDPU flight s/w thus far is with PLASTIC EM electronics. There may not be an opportunity to fully validate science product section of s/w with actual FM beam calibrations.