Transcript Section 1.B - Cost/Schedule

GLAST LAT Project
March 24, 2003
GLAST Large Area Telescope:
Gamma-ray Large
Area Space
Telescope
Tracker Subsystem
WBS 4.1.4
1B: Schedule Summary; Critical
Paths; Risks
Thomas Borden
Stanford Linear Accelerator Center
Tracker Subsystem Engineer
[email protected]
1B
Tracker Peer Review, WBS 4.1.4
1
GLAST LAT Project
March 24, 2003
Agenda
• Cost
• Schedule and critical Path
• Risks
1B
Tracker Peer Review, WBS 4.1.4
2
GLAST LAT Project
March 24, 2003
Cost
• Total US Tracker Cost $10,688,475.26 (inflated)
• Significant Collaborator contribution:
– Italy: purchase 5000 SSD’s, Fabricate, assemble and test
Qualification, Flight and Spare towers
– Japan: purchase 6400 SSD’s and support testing of all SSD’s
CarbonFiber Wall
1B
Tracker Peer Review, WBS 4.1.4
3
GLAST LAT Project
March 24, 2003
Schedule
FY 01
FY 02
FY 03
FY 04
FY 05
JU L
A USGEOC
P NTODVE JA
C FE
N MA
B A
RPMA
R JU
Y N
JU LA USGEOC
P NTODVE C
JA FE
N MA
B A
RPMA
R JU
Y N
JU L
A USGEOC
P NTODVE JA
C FE
N B
MA A
RPMA
R JU
Y N
JU L
A USGEOC
P NTODVE JA
C FE
N MA
B A
RPMA
R JU
Y N
JU L
A USGE OC
N
PO TV
+ Key Milestones
PD R
C DR
LA T I&T
Ship LAT
+ Tray Assembly Development
+ Tray Mechanical
+ Electronics Design
+ SSD Product ion
+ Flight Electronics Assembly
+ Flight Trays Sub-Assembly
+ Final Assembly of Flight Trays
+ Qualificat ion Test
+ Flight Tower Assembly
+ Delivery of Flight Towers 15 and 16
Ea rly B a r
LT -R V Summar y Sche du le
13 MA R 0 3 1 4:0 9
41 4 T rac ke r
Ta rge t B ar
Pr ogr es s B ar
© Primavera Systems, Inc.
1B
Tracker Peer Review, WBS 4.1.4
4
GLAST LAT Project
March 24, 2003
Schedule
Tracker Work Flow Summary - QA/B, C1/2 - FM16
LS 4000 50
PW B Pro c & Flex Attac h
(UCSC,S LAC) Q,C-FM 1 6
29 M AY0 3
LS 4000 40
LS 4000 60
AS IC Pro c , T es t & Dic i ng
(UCSC,S LAC) Q,C-FM 1 6
M CM As s y , Tes t &
Bu rn-in (UCS C,SLA C) Q,C-FM 1 6
29 M AY0 3
20 OCT0 3
LS 4000 10
SS D Pro dn & Tes t
(J p n,Ity ,SLA C) Q,C-FM 1 6
LS 4000 20
SS D Lad der As s e m bly
(Ity ) - Q, C-FM 16
03 APR0 3
26 J AN0 4
LS 4000 30
Tra y Pa nel F ab,T es t
(SL AC,Hy tec ,Ity ) Q,C-FM 1 6
LS 4000 70
Tra y As s em bly a nd T es t
(Ity ) - Q, C-FM 16
23 DEC0 3
21 M AY0 4
LS 4000 80
Re adou t Cab le Fa b &
As s y (UCSC) Q,C-FM 1 6
LS 4000 90
To wer A s s em bly (Ity ) Q,C-FM 1 6
20 J UN0 3
LS 4001 00
To wer T es tin g (Ity ) Q,C-FM 1 6
14 J UN0 4
LS 4001 10
M o dule s RF I Q,C-FM 1 6
17 AUG0 4
24 AUG0 4
LS 4000 85
Sid ewal l Fab ric at ion
(SL AC/Hy tec ) Q,C-FM 1 6
12 FEB0 3A
Tracker Work Flow Summary
- Qual Units A & B
03 APR0 0
Sta rt Da te
Fin is h Date
02 NOV0 6
Da ta Da te
01 M AR0 3
Ru n Dat e
18 M AR0 3 09 :19
LA T3
Sh eet 1 of 3
Gamma Ray Large A rea S pace Telescope
Driving relationship
Da te
Re v is io n
Ch ec k e d
Tracker Work Flow Overview
Nondriving relati onship
Critical color
© Primavera Systems, Inc.
1B
Tracker Peer Review, WBS 4.1.4
5
Ap prov e d
GLAST LAT Project
March 24, 2003
Schedule
Tracker Work Flow Summary - Qual Units A & B
LS 4Q00 50
PW B Pro c an d Fle x
Att ac h ( UCSC,SLA C) QA /B
29 M AY0 3
LS 4Q00 40
LS 4Q00 60
AS IC Pro c , T es t & Dic i ng
(UCSC,S LAC) - QA/ B
M CM As s y , Tes t &
Bu rn-in (UCS C,SLA C) QA /B
29 M AY0 3
29 J UL0 3
LS 4Q00 10
SS D Pro dn & Tes t
(J p n,Ity ,SLA C) - QA/B
LS 4Q00 20
SS D Lad der As s e m bly
(Ity ) - QA /B
28 SEP0 1A
13 NOV0 2A
LS 4Q00 30
Tra y Pa nel F ab & Tes t
(SL AC,Hy tec ,Ity ) - QA/B
LS 4Q00 70
Tra y As s em bly a nd T es t
(Ity ) - QA /B
02 APR0 3
17 OCT0 3
LS 4Q00 80
Re adou t Cab le Fa b &
As s y (UCSC) - QA/ B
LS 4Q00 90
To wer A s s em bly (Ity ) QA /B
20 J UN0 3
LS 4Q01 00
To wer T es tin g (Ity ) QA /B
07 NOV0 3
LS 4Q01 10
M o dule s RF I - QA /B
27 J AN0 4
27 J AN0 4
LS 4Q00 85
Sid ewal l Fab ric at ion
(SL AC/Hy tec ) - QA /B
12 FEB0 3A
Tracker Work Flow Summary
- Cal Uni ts 1 & 2
03 APR0 0
Sta rt Da te
Fin is h Date
Da ta Da te
Ru n Dat e
ACT
02 NOV0 6
01 M AR0 3
18 M AR0 3 09 :19
LA T3
Sh eet 2 of 3
Gamma Ray Large A rea S pace Telescope
DES
Driving relationship
Da te
Re v is io n
Ch ec k e d
Tracker Work Flow Overview
Nondriving relati onship
Critical color
© Primavera Systems, Inc.
1B
Tracker Peer Review, WBS 4.1.4
6
Ap prov e d
GLAST LAT Project
March 24, 2003
Schedule
Tracker Work Flow Summary - Cal Uni ts 1 & 2
LS 4C00 50
PW B Pro c an d Fle x
Att ac h ( UCSC,SLA C) C1 /2
29 M AY0 3
LS 4C00 40
LS 4C00 60
AS IC Pro c , T es t & Dic i ng
(UCSC,S LAC) - C1/ 2
M CM As s y , Tes t &
Bu rn-in (UCS C,SLA C) C1 /2
29 M AY0 3
29 J UL0 3
LS 4C00 10
SS D Pro dn & Tes t
(J p n,Ity ,SLA C) - C1/2
LS 4C00 20
SS D Lad der As s e m bly
(Ity ) - C1 /2
02 M AY0 2A
18 APR0 3
LS 4C00 30
Tra y Pa nel F ab & Tes t
(SL AC,Hy tec ,Ity ) - C1/2
LS 4C00 70
Tra y As s em bly a nd T es t
(Ity ) - C1 /2
05 M AY0 3
02 DEC0 3
LS 4C00 80
Re adou t Cab le Fa b &
As s y (UCSC) - C1/ 2
LS 4C00 90
To wer A s s em bly (Ity ) C1 /2
20 J UN0 3
LS 4C01 00
To wer T es tin g (Ity ) - C1/2
19 DEC0 3
LS 4C01 10
M o dule s RF I - C1 /2
01 M AR0 4
08 M AR0 4
LS 4C00 85
Sid ewal l Fab ric at ion
(SL AC/Hy tec ) - C1 /2
12 FEB0 3A
Sta rt Da te
03 APR0 0
Fin is h Date
02 NOV0 6
Da ta Da te
01 M AR0 3
Ru n Dat e
18 M AR0 3 09 :19
LA T3
ACT
Sh eet 3 of 3
Gamma Ray Large A rea S pace Telescope
DES
Driving relationship
Da te
Re v is io n
Ch ec k e d
Tracker Work Flow Overview
Nondriving relati onship
Critical color
© Primavera Systems, Inc.
1B
Tracker Peer Review, WBS 4.1.4
7
Ap prov e d
GLAST LAT Project
March 24, 2003
Milestones
AV
Activity
ID
ND
Activity
Description
AV: Early FloatFloat
Finish -1m
-2m
Baseline
Finish
Early
Finish
FY 03
FY 04
FY 05
FY 06
4.1.4 Tra cke r
4.1 .2 S y s te m E n gine ering
4
2S201070
2
Tracker CDR
05/28/03
-93
01/14/03
05/28/03
4
2S201440
2
Sub System Production
Readiness Review-TRKR
05/28/03
-93
01/14/03
05/28/03
4
2S201190
2
Sub System Qual
Readiness Review-TRKR
11/07/03
-5
10/31/03
11/07/03
4
2S201250
2
Sub System Qual
Review-TRKR
01/27/04
-5
01/20/04
01/27/04
Run Date
03/13/03 09:51
Data Date
03/01/03
© Primavera Systems, Inc.
1B
G LA ST L A T PR OJ EC T
Le ve l 3 M ile sto nes
A V: F loa t
Tracker Peer Review, WBS 4.1.4
LT-L8: A V: Float to Level 3 Mi lestones
FL-L8: Level 3 Milestones
AV : Up Triangle, L3: Down Triangl e
Report #9
Sheet 1
8
GLAST LAT Project
March 24, 2003
Milestones
AV
Activity
ID
ND
Activity
Description
AV: Early FloatFloat
Finish -1m
-2m
Baseline
Finish
Early
Finish
FY 03
FY 04
FY 05
FY 06
4.1 .7 E lec tr onic s
4
1M1000550
7
(9) MCM's from Tracker to
Elec
10/31/02
-29
09/20/02
10/31/02A
4
1M1000910
7
(36) MCM's for EM2 from
Tracker to Elec
07/25/03
-5
07/18/03
07/25/03
Run Date
03/13/03 09:51
Data Date
03/01/03
© Primavera Systems, Inc.
1B
G LA ST L A T PR OJ EC T
Le ve l 3 M ile sto nes
A V: F loa t
Tracker Peer Review, WBS 4.1.4
LT-L8: A V: Float to Level 3 Mi lestones
FL-L8: Level 3 Milestones
AV : Up Triangle, L3: Down Triangl e
Report #9
Sheet 2
9
GLAST LAT Project
March 24, 2003
Milestones
AV
Activity
ID
ND
4
1M1001280
9
4
1M1001430
4
Activity
Description
AV: Early FloatFloat
Finish -1m
-2m
Baseline
Finish
Early
Finish
As-Built dwgs for EM
TKR-TKR to I&T
12/06/02
-1
12/05/02
12/06/02A
9
Delv of TKR EM to SLAC
I&T/MGSE
04/11/03
-80
12/09/02*
03/03/03*
1M1000200
9
Tracker Modules A & BRFI (
for Calibration)
01/27/04
14
02/17/04*
02/17/04*
4
2S201320
9
Sub System-TRKR RFI's
--1st Article
02/17/04
0
02/17/04
02/17/04
4
1M1000220
9
Tracker Modules 1 & 2 RFI (
for Calibration)
03/08/04
5
03/15/04*
03/15/04*
4
1M1000250
9
Flight Tracker Tower 3, 4
RFI
04/05/04
50
06/15/04*
06/15/04*
4
1M1000260
9
Flight Tracker Tower 5, 6
RFI
05/03/04
51
07/15/04*
07/15/04*
4
1M1000270
9
Flight Tracker Tower 7, 8
RFI
06/01/04
41
07/29/04*
07/29/04*
4
1M1000280
9
Flight Tracker Tower 9, 10
RFI
06/14/04
42
08/12/04*
08/12/04*
4
1M1000290
9
Flight Tracker Tower 11, 12
RFI
06/28/04
42
08/26/04*
08/26/04*
4
1M1000300
9
Flight Tracker Tower 13, 14
RFI
07/21/04
36
09/10/04*
09/10/04*
4
1M1000310
9
Flight Tracker Tower 15, 16
RFI
08/24/04
22
09/24/04*
09/24/04*
FY 03
FY 04
FY 05
FY 06
4.1 .9 I& T
Run Date
03/13/03 09:51
Data Date
03/01/03
© Primavera Systems, Inc.
1B
G LA ST L A T PR OJ EC T
Le ve l 3 M ile sto nes
A V: F loa t
Tracker Peer Review, WBS 4.1.4
LT-L8: A V: Float to Level 3 Mi lestones
FL-L8: Level 3 Milestones
AV : Up Triangle, L3: Down Triangl e
Report #9
Sheet 3
10
GLAST LAT Project
March 24, 2003
Milestones
AV
Activity
ID
ND
Activity
Description
AV: Early FloatFloat
Finish -1m
-2m
Baseline
Finish
Early
Finish
08/25/03
10/16/03*
10/16/03*
FY 03
FY 04
FY 05
FY 06
4.1.7 Ele ctro nic s
4.1 .4 Tr ac k e r
7
1M1000920
4
Run Date
EM2 TEM for Qual Towers
A,Bfrom Elec to Tracker
03/13/03 09:51
Data Date
03/01/03
© Primavera Systems, Inc.
1B
37
G LA ST L A T PR OJ EC T
Le ve l 3 M ile sto nes
A V: F loa t
Tracker Peer Review, WBS 4.1.4
LT-L8: A V: Float to Level 3 Mi lestones
FL-L8: Level 3 Milestones
AV : Up Triangle, L3: Down Triangl e
Report #9
Sheet 4
11
GLAST LAT Project
March 24, 2003
Milestones
AV
Activity
ID
ND
Activity
Description
1M1001514
4
EM1 EGSEWS-S/W R2
I&T to TKR
AV: Early FloatFloat
Finish -1m
-2m
Baseline
Finish
Early
Finish
12/13/02
12/05/02
12/13/02A
FY 03
FY 04
FY 05
FY 06
4.1.9 I& T
4.1 .4 Tr ac k e r
9
Run Date
03/13/03 09:51
Data Date
03/01/03
© Primavera Systems, Inc.
1B
-6
G LA ST L A T PR OJ EC T
Le ve l 3 M ile sto nes
A V: F loa t
Tracker Peer Review, WBS 4.1.4
LT-L8: A V: Float to Level 3 Mi lestones
FL-L8: Level 3 Milestones
AV : Up Triangle, L3: Down Triangl e
Report #9
Sheet 5
12
GLAST LAT Project
March 24, 2003
Critical Path
Activity
ID
Early
St art
Early
Finish
Tracker 1st Most Critical Path
4T007000
SSD Lot 15-16 (JAPAN)
03FEB03A
03APR03
4T045200
02DEC03*
26JAN04
27JAN04
02MAR04
03MAR04
23MAR04
24MAR04
09APR04
4T046265
Assemble SSD Ladders Lot
15-16
Assemble ladders to tray lot
15 - 16
Wire bonding Ladders to
tray and test 15 - 16
Incapsulation of Wire bonds
15 - 16
Thermal Test 15 - 16
12APR04
23APR04
4T046275
Final Electrical Test 15 - 16
26APR04
14MAY04
4T046280
Ship to INFN lot 15-16
17MAY04
21MAY04
4T046282
4T052550
IA: Ship Flight Trays lot 15 16 to INFN
Assemble Tower 15 - 16
24MAY04
14JUN04
4T052555
Vibration test 15 - 16
15JUN04
06JUL04
4T052565
Thermal Test 15 - 16
07JUL04
27JUL04
4T052570
Final Electrical Test 15 - 16
28JUL04
17AUG04
4T046250
4T046255
4T046260
Activity
Description
Sta rt Da te
03 APR0 0
Fin is h Date
02 NOV0 6
Da ta Da te
01 M AR0 3
Ru n Dat e
11 M AR0 3 16 :23
© Primavera Systems, Inc.
Rem
%
Dur
2003
2004
2005
FEB
MAR
APR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
A PR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
APR
MAYJUNJULAUG
SEP
21MAY04
Ea rly Ba r
CRIT
Sh eet 1 of 4
Da te
Ta rget B ar
Re v is io n
Ch ec k e d
Pro gres s Ba r
Gamma Ray Large A rea S pace Telescope
Tracker Critical P ath
First Critical Path
1B
Tracker Peer Review, WBS 4.1.4
13
Ap prov e d
GLAST LAT Project
March 24, 2003
Critical Path
Activity
ID
4T052572
Activity
Description
Ship to SLAC 15 - 16
Rem
%
Dur
Early
St art
Early
Finish
18AUG04
24AUG04
4T052575
AV: Deliver Flight Towers 15
-16 to I & T
1M1000310
Flight Tracker Tower 15, 16
RFI
Tracker 2nd Most Critical Path
4T038512
Ready to Fabricate TMCM's
11APR03*
4T038600
11APR03
24APR03
4T038700
Bond Kapton right angle
interconnect
Load SMT parts
25APR03
08MAY03
4T038800
QC hybrid PC boards
09MAY03
04JUN03
4T038900
05JUN03
01JUL03
02JUL03
02JUL03
30JUL03
30JUL03
4T039100
Load IC's and Wire Bond
Hybrid Boards
(PR) Clean, Test, burn-in,
encap Load Bds Lot 1
(REC) Clean, Test, burn-in,
encap Load Bds Lot 1
(PR) Ship lot 1 to Pisa
31JUL03
31JUL03
4T039102
(REC) Ship lot 1 to Pisa
04AUG03
04AUG03
4T045404
Assemble TMCMs to tray lot
A- B
Assemble TMCMs to tray lot
1-2
Assemble TMCMs to tray lot
3-4
Assemble TMCMs to tray lot
5-6
05AUG03
02SEP03
03SEP03
15SEP03
16SEP03
29SEP03
30SEP03
13OCT03
4T039000
4T039002
4T045504
4T045645
4T045745
2003
2004
2005
FEB
MAR
APR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
A PR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
APR
MAYJUNJULAUG
SEP
24AUG04*
24SEP04*
Sheet 2 of 4
Second Critical Path
1B
Tracker Peer Review, WBS 4.1.4
14
GLAST LAT Project
March 24, 2003
Critical Path
Activity
ID
Early
St art
Early
Finish
14OCT03
03NOV03
04NOV03
17DEC03
18DEC03
09JAN04
12JAN04
26JAN04
4T045865
Assemble TMCMs to tray lot
7-8
Assemble ladders to tray lot
7-8
Wire bonding Ladders to
tray and test 7 - 8
Incapsulation of Wire bonds
7-8
Thermal Test 7 - 8
27JAN04
17FEB04
4T045875
Final Electrical Test 7 - 8
18FEB04
02MAR04
4T045880
Ship to INFN lot 7-8
03MAR04
12MAR04
4T045882
4T052150
IA: Ship Flight Trays lot 7 - 8
to INFN
Assemble Tower 7 - 8
15MAR04
02APR04
4T052155
Vibration test 7 - 8
05APR04
23APR04
4T052255
Vibration test 9 - 10
26APR04
07MAY04
4T052355
Vibration test 11 -12
10MAY04
21MAY04
4T052455
Vibration test 13 - 14
24MAY04
07JUN04
03MAR03
02APR03
03MAR03
02APR03
03APR03
05MAY03
4T045845
4T045850
4T045855
4T045860
Activity
Description
Tracker 3rd Most Critical Path
4T014500
Assemble Flight Tray Panel
- Lot A
4T014505
Assemble Flight Tray
Panels Lot -B
4T014510
Assemble Flight Tray
Panels Lot - 1
Rem
%
Dur
2003
2004
2005
FEB
MAR
APR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
A PR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
APR
MAYJUNJULAUG
SEP
12MAR04
Sheet 3 of 4
Third Critical Path
1B
Tracker Peer Review, WBS 4.1.4
15
GLAST LAT Project
March 24, 2003
Critical Path
Activity
ID
4T014515
4T014520
4T014525
4T014530
4T014535
4T014540
4T014545
4T014550
4T014555
4T014560
4T014565
4T014570
4T014575
4T014580
4T046245
Activity
Description
Assemble Flight Tray
Panels Lot - 2
Assemble Flight Tray
Panels Lot - 3
Assemble Flight Tray
Panels Lot - 4
Assemble Flight Tray
Panels Lot - 5
Assemble Flight Tray
Panels Lot - 6
Assemble Flight Tray
Panels Lot - 7
Assemble Flight Tray
Panels Lot - 8
Assemble Flight Tray
Panels Lot - 9
Assemble Flight Tray
Panels Lot - 10
Assemble Flight Tray
Panels Lot - 11
Assemble Flight Tray
Panels Lot - 12
Assemble Flight Tray
Panels Lot - 13
Assemble Flight Tray
Panels Lot - 14
Assemble Flight Tray
Panels Lot - 15
Assemble TMCMs to tray lot
15-16
Rem
%
Dur
Early
St art
Early
Finish
03APR03
05MAY03
06MAY03
06JUN03
06MAY03
06JUN03
09JUN03
10JUL03
09JUN03
10JUL03
11JUL03
12AUG03
11JUL03
12AUG03
13AUG03
15SEP03
13AUG03
15SEP03
16SEP03
16OCT03
16SEP03
16OCT03
17OCT03
18NOV03
17OCT03
18NOV03
19NOV03
23DEC03
02JAN04
15JAN04
2003
2004
2005
FEB
MAR
APR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
A PR
MAYJUN
JULAUG
SEPOCT
N OV
D ECJAN
FEB
MAR
APR
MAYJUNJULAUG
SEP
Sheet 4 of 4
Third Critical Path
1B
Tracker Peer Review, WBS 4.1.4
16
GLAST LAT Project
March 24, 2003
Critical Path
• Critical Path Dates:
– May 1, 2003 – Start tray panel fabrication
– July 30, 2003 – SLAC deliver first lot of TMCM’s to INFN-Pisa
– November 7, 2003 - Qualification Towers Assembled
• Flow from Qual tower and Spare defined by tower testing
1B
Tracker Peer Review, WBS 4.1.4
17
GLAST LAT Project
March 24, 2003
Risks TKR-1
•
•
•
•
•
Risk Description:
– Low Tracker MCM yield. Each MCM holds 26 ICs. The MCMs are tested before encapsulation, to allow
for rework. However, rework is costly, and too much rework could make it impossible to hold the
schedule and budget. We need it to be the exception, rather than the rule, but so far, in the EM run,
rework involving IC replacement was needed on the majority of MCMs.
Risk Mitigation:
– Screening and handling procedures need to be improved according to the plan described here.
Risk Impact Assessment:
– Possible delay in tower assembly and increased labor cost at Teledyne.
Risk Mitigation Implementation Plan:
– 1. (Johnson, Sugizaki) Improve IC screening. The GTRC chips were not screened for the EM, some
features of the GTFE were not screened, and the screening was at only 2 MHz due to technical
problems. These systems will be improved and tested. An inker is being added to the probe station to
remove human error in die sorting. We also may need to reject dice close to the wafer edge. (end
March) 2. (Johnson, Ziegler) Improve IC handling. Detailed procedures are being written. (end March)
3. (Borden) Improve testing of the MCM PWB prior to assembly and again prior to die attach. (Mid
April) 4. (Johnson, Sugizaki) Improve the MCM test software to speed up localization, of a bed IC.
(June 1) 5. Improve IC design (done), especially to remove the G-chip oscillation problem.
Current Status:
– March 19, 2003: the GTRC probe card was built and is working well with updated test vector software.
The GTFE probe card was rebuilt and is working and currently being put through thorough tests. Both
cards work at 20 MHz+. The wafer testing procedure is written and reviewed and in the release
process. The cleanroom has been prepared and inspected. The inker is on order (end March). The new
chips have been tested and the design improvements were successful.
1B
Tracker Peer Review, WBS 4.1.4
18
GLAST LAT Project
March 24, 2003
Risks TKR-2
•
•
•
•
•
Risk Description:
– MCM-SSD CTE mismatch. The Tracker MCMs and the SSDs are connected by wire bonds, which are to
be encapsulated. This interface is not yet tested. Since it goes the full width of a tray, there is a risk of
damage from movement during thermal cycling.
Risk Mitigation:
– The flight MCMs are to be fabricated in Polyimide instead of FR4, to lower the CTE (Aramid was
considered but has other undesirable features). The encapsulation will be Nusil silicone, as in the
ladders, which allows some movement with low stress. The interface needs to be tested on the EM.
Risk Impact Assessment:
– Critical Path Impact
Risk Mitigation Implementation Plan:
– Build a complete functional engineering-model tray by mid April(two MCMs) in addition to the ones in
the mini-tower, and put it through full qualification-level thermal-vacuum testing. (May)
Current Status:
– March 19, 2003: The tray panel is in hand, as are the two MCMs and the ladders. The procedure for
encapsulating these bonds is being tested first on some mechanical/thermal EM trays.
1B
Tracker Peer Review, WBS 4.1.4
19
GLAST LAT Project
March 24, 2003
Risks TKR-3
•
•
•
•
•
Risk Description:
– Tray-panel fabrication start-up. Fabrication of tray panels at Plyform needs to start in early March (i.e.
pre-CDR) unless the rate can be made to exceed current predictions. We have not yet seen a plan
from Italy/Plyform on how to accomplish this, nor have we seen any documentation.
Risk Mitigation:
– SLAC assistance to Pisa in getting documentation and materials in place.
Risk Impact Assessment:
– Critical path impact
Risk Mitigation Implementation Plan:
– Acquire Carbon-Carbon material early from SLAC (done). Procure cores from SLAC (in progress). Tom
Borden travel to Plyform in early February to assist with planning and documentation.
Current Status:
– March 19, 2003: 1. The cores were ordered and already received and shipped to Italy. 2. Tom traveled
to Italy and helped prepared a draft procedure document. 3. We received a detailed schedule from
Pisa for the flight build. It shows that the tray panel fab can start in May instead of March and the
electronics will still be the critical path.
1B
Tracker Peer Review, WBS 4.1.4
20
GLAST LAT Project
March 24, 2003
Risks TKR-4
•
•
•
•
•
Risk Description:
– Procurement of MCM components. MCM production at Teledyne needs to start soon to have MCMs
ready to accept ASICs in late May. The design includes parts that are not yet approved but have 8week lead times (the connectors), parts for which we have been working for a long time for approval
without complete closure (polyfuses), and parts for which we do not have agreement on fabrication
specifications (the PWB and flex). Furthermore, our success rate at SLAC for procuring these items
for the EM was poor. We need Teledyne on contract to help us handle these procurements. The LAT
parts specialist to date has never made any contacts with Teledyne.
Risk Mitigation:
– Increase manpower at SLAC on these procurements. Contract with Teledyne to do all of the parts
receiving.
Risk Impact Assessment:
– Critical path impact.
Risk Mitigation Implementation Plan:
– Have a meeting at Teledyne, including Nick Virmani, as soon as possible to iron out the contract and
specifications to be used for MCM PWB and flex procurements and specifications to be used for MCM
assembly. Action also needs to be taken on the Omnetics nano-connectors to get them approved for
flight.
Current Status:
– March 19, 2003: 1. The meeting at Teledyne was held successfully, clarifying a lot of issues. 2. The
Omnetics connectors were approved and are on order. 3. The polyswitches were approved and are on
order. 4. Final PWB and flex prototypes are in hand and being tested. 5. Jeff Tice and Jerry Clinton at
SLAC are working the procurements and associated specifications. A quote for the PWBs was
requested.
1B
Tracker Peer Review, WBS 4.1.4
21