GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 1

GLAST Large Area Telescope:GLAST Large Area Telescope:

Tracker, W.B.S 4.1.4

August Status Meeting

Robert Johnsonrjohnson@scipp.ucsc.edu

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 2

Flight-Tower Assembly StatusFlight-Tower Assembly Status

• Tray Panel status:– All flight tray panels are completed

– About half of the tray panels for the 17th tower were also delivered before Plyform went on holiday. The rest are close to completion.

– All bottom trays for 18 towers have been delivered.

• Sidewall status– Completed for 17 towers

• MCM status:– Production is stopped.

– Flight quality MCMs delivered for 17+ towers

– The 18th tower will have to include non-flight (NCR) MCMs but will be only slightly less efficient than the flight towers.

• Tray and tower assembly status:– All 16 flight towers have been assembled

– However, some flight cables are still missing (next slide)

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 3

Tracker Flight-Tower StatusTracker Flight-Tower Status

Tower Assembly Vibe T/V Status

A,B,1-6 Integrated into the Grid

7 Needs a C6 cable installed, then ship

8 1 1 Replace 1 noisy tray, install 3 cables, and repeat both vibe and T/V testing

9 Replace 3 cables and ship

10 At Alenia ready for vibe; replace 3 cables

11 In T/V testing; needs 2 cables replaced

12 Add 1 flight cable after env. testing

13 In T/V testing; needs 2 cables added

14 Has all 8 flight cables; in vibration testing

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 4

Tower 7 and 8 ReworkTower 7 and 8 Rework

• Each of these two towers had one tray with high noise on one side when at elevated temperature.– Both trays were originally in “Tower-0”, so they were two of the

first trays built.– They differ from following trays primarily in that the wire bonds

from MCM to SSDs and bias circuit are encapsulated with silicone.

• The encapsulation was removed from the process because it was catastrophic for heavy trays (hundreds of wire bonds failed during thermal cycles).

• The problem with the thin-converter mid trays is subtle and was not realized until the towers went into T/V testing.

• The symptoms are consistent with intermittent connection of the bias current to the SSD ladders, but up to now direct measurements of the bias current have not confirmed this. Some more tests are in progress on the Tower-7 tray.

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 5

Tower 7 and 8 ReworkTower 7 and 8 Rework

• The bad tray in Tower 7 was replaced, and the tower has by now completed a second round of environmental testing.– It should be ready to ship next week after installing a C6 cable.

• The bad tray in Tower 8 will (probably) be replaced in the next week. If so, the tower will go back into environmental testing after installation of the remaining flight cables.– This will therefore be the last flight tower to be shipped.

– We are hoping to test Tower-15 in parallel with it, in order to have a true flight spare tower.

• Note that two towers already installed in the Grid each have a single Tower-0 tray.– In those cases, however, they are a top tray and bottom tray, which

differ greatly from mid trays in terms of mechanical/thermal response.

– They showed no problems, even in T/V testing.

– If they should develop the same problem in the future, the performance impact would be slight, and the trigger would be unaffected.

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 6

Tracker Flex-Circuit Cable StatusTracker Flex-Circuit Cable Status

I expect to have all of the flight cables by the end of next week.

The cables needed to complete Towers 8, 9, 10 should be carried to Italy this weekend.

Parlex projects 9 additional cables (not shown here) by the end of next week, but they will almost certainly be a week later, at least. Still, they may provide the C3 and C5 cables for Tower 15.

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 7

Tracker Environmental Testing ScheduleTracker Environmental Testing Schedule

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 8

Estimated Tower Ship DatesEstimated Tower Ship Dates

Tower 7 September 9

Tower 8 September 9 if we don’t replace a tray. End of September if we do.

Tower 9 September 9

Tower 10 September 14

Tower 11 September 23

Tower 12 September 23

Tower 13 September 23

Tower 14 September 16

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 9

Cost/Schedule Reports for Cost/Schedule Reports for 4.1.4 Tracker Presentation4.1.4 Tracker Presentation

July 2005 Month EndJuly 2005 Month End

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 10

Level 3 Milestone CountLevel 3 Milestone Count

4.1.4 Tracker

0

2

4

6

8

10

12

14

16

18

FE

B05

MA

R05

AP

R05

MA

Y05

JUN

05

JUL0

5

AU

G05

SE

P05

OC

T05

To

wer

Plan Actual Forecast

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 11

Level 3 Milestone ListLevel 3 Milestone ListWPNO Activity

DescriptionBaselineFinish

-2mVar

-1mVar

DeltaBslnVar

EarlyFinish

4.1.4 Tracker

Flight Tracker Tower A RFI 02/04/05 0 0 0 02/04/05A

Flight Tracker Tower B RFI 03/02/05 4 4 4 02/24/05A

Flight Tracker Tower 1 RFI 03/22/05 -35 -35 -35 05/10/05A

Flight Tracker Tower 2 RFI 04/20/05 -14 -14 -14 05/10/05A

Flight Tracker Tower 3 RFI 05/03/05 -5 -5 -5 05/10/05A

Flight Tracker Tower 4 RFI 05/16/05 -16 -17 -17 06/09/05A

Flight Tracker Tower 5 RFI 06/03/05 -3 -4 -4 06/09/05A

Flight Tracker Tower 6 RFI 06/16/05 -13 -31 -31 08/01/05

Flight Tracker Tower 7 RFI 06/27/05 -8 -48 -48 09/02/05

Flight Tracker Tower 8 RFI 07/06/05 -17 -45 -45 09/08/05

Flight Tracker Tower 9 RFI 07/15/05 -12 -40 -40 09/12/05

Flight Tracker Tower 10 RFI 07/26/05 -15 -35 -35 09/14/05

Flight Tracker Tower 11 RFI 08/04/05 -10 -28 -28 09/14/05

Flight Tracker Tower 12 RFI 08/15/05 -8 -24 -26 09/21/05

Flight Tracker Tower 13 RFI 08/24/05 -9 -19 -19 09/21/05

Flight Tracker Tower 14 RFI 09/02/05 -4 -14 -14 09/23/05

Flight Tracker Tower 15 RFI 09/13/05 -4 -21 -21 10/12/05

2005 2006FEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJUL

© Primavera Systems, Inc.

Run Date 08/19/05 08:47

Data Date 08/01/05

GLAST LAT PROJECTLevel 3 Milestones

Baseline Variance (Organized by Subsystem)

LT-DZ: Baseline VarianceFL-D4: AV: Level 3 Milestones

Report #10Sheet 2

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 12

Cost ReportCost Report

Monthly Contractor Financial Management Report NASA form 533M Report for Month Ending: 31-Jul-05 Approved OMB # 2700-0017/31/2005

Reporting Cost Incurred Estimated Cost Estimated Final UnfilledCategory Cost Orders

During Month Cum. to Date Detail Balance of Contractor Contract OutstandingActual Planned Actual Planned AUG05 SEP05 Contract Estimate Value

4.1.4 TRACKER4.1.4.1 TRACKER MANAGEMENT 102 48 3,898 3,829 36 33 -69 3,898 3,898 04.1.4.2 RELIABILITY & QUALITY ASSURANCE 0 0 4 0 0 0 -4 0 0 04.1.4.3 TRAY SUB-ASSEMBLY 110 17 12,864 13,262 19 17 398 13,298 13,298 784.1.4.4 TOWER STRUCTURE & ASSEMBLY 117 266 3,270 3,856 161 121 587 4,139 4,139 3424.1.4.5 TRACKER TEST & CALIBRATION 38 16 196 233 18 17 37 268 268 04.1.4.7 INSTRUMENT INTEGRATION & TEST (SLAC) 0 6 59 99 0 0 40 99 99 0CAPW[3]Totals: 367 352 20,290 21,279 235 188 989 21,702 21,702 421

GLAST LAT Project Monthly Review, September 1, 2005

4.1.4 Tracker Subsystem R. Johnson 13

FTE Report FTE Report (DOE/NASA-funded only)(DOE/NASA-funded only)

4.1.4 TrackerFTEs

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

PLANNED

ACTUALS