GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 1
GLAST Large Area Telescope:GLAST Large Area Telescope:
Tracker SubsystemWBS 4.1.4
5C: Silicon Detector Procurement
Hartmut F.-W. SadrozinskiSanta Cruz Institute for Particle PhysicsUniversity of California at Santa CruzTracker Subsystem Scientist
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 2
LAT TKR Silicon Detector Procurement LAT TKR Silicon Detector Procurement
• Applicable LAT documents:– Specifications– LAT-DS-00011 LAT SSD Technical Specifications– LAT-DS-00026 LAT Flight SSD Drawings– LAT-DS-00027 LAT Test Structure Drawings– LAT-CR-00082 LAT SSD Quality and Reliability Assurance– LAT-TD-00085Testing Procedures for the GLAST LAT SSDs– Test Results– LAT-TD-00086LAT Review of SSD RHA Test Results – LAT-TD-00128Results from Heavy Ion Irradiation (SSD)– LAT-QR-01078 Q/A OF THE GLAST LAT SSD: RHA
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 3
TKR Silicon Strip Detectors (SSD)TKR Silicon Strip Detectors (SSD)
GLAST Cut-off
“Skinny” GLAST Cut-of
“Skinny”
• GLAST has driven the 6” wafer technology- Area: 8.95 cm x 8.95 cm- Thickness: 400 um, pitch 228 um- Very aggressive specs
(leakage currents, bad strips, dicing)
- Complete testing by HPK
• Q/A- Every wafer has flight SSD and test
structures (coupons, “cut-offs”)- Cut-off has full length, 8 channel SSD
(“Skinny”) and assorted other detectors
- Flight SSD and “Skinny” are marked with same ID#
- Cut-offs are used for RHA, long-term testing, glueing, wire bonding, etc.
GLAST Flight SSD
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 4
TKR SSD RHA at Hiroshima UniversityTKR SSD RHA at Hiroshima University
• RHA and Production Q/A for one SSD from each shipping lot- The LAT SSD Q/A provisions LAT-CR-00082 define the
irradiations to be performed as part of the procurement process. One irradiation with 60Co per shipping lot has to be performed on coupons made on the same wafers as the flight SSDs, and several critical electrical parameters measured pre- and post-rad.
- It turns out that the radiation monitoring has been carried out on 77 production runs and no problem has been found.
• Procedures- The monitor sensors were irradiated up to a TID of 10
krad(Si), with a dose rate of 3.8 rad(Si)/s. - Of the 77 test sensors, 21 were biased during irradiation at
150 V. After the irradiation, these monitor sensors were kept under 150 V bias at 20 oC until they were electrically characterized for one week after irradiation. The rest of 56 sensors were not biased during irradiation and the one week annealing period.
- Electrical tests performed: leakage current, interstrip capacitance and interstrip isolation
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 5
TKR SSD ProcurementTKR SSD Procurement
• # of SSD for 16 (+2 spare) towers:- 4 SSD/ladder*2*4Ladders/tray*18trays/tower*18towers =
10,368- + spares- + wastage- + prototypes- Total Purchase: 11,535
• Funding:- INFN/ASI 5,000- Japan 6,535
• Prototyping from 1996-2000, use 550 SSD in BTEM/BFEM
GLAST 1996
GLAST 1997
GLAST 1998
GLAST 1999
GLAST 2000
4” 4” 6” 6” 6” 6 x 6 6.4 6.4 6.4 10.7 9.5 9.5 8.95x8.95
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 6
TKR SSD Delivery ProfileTKR SSD Delivery Profile
1000
2000
3000
4000
5000
6000
7000
Jan/1 May/3 Sep/1 Jan/1 May/2 Sep/1 Jan/1
LAT SSD Purchased by LAT and Shipped by HPK
Date
| 2001 | 2002 |2003
6205
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 7
TKR SSD Production & Funding PlanTKR SSD Production & Funding Plan
2000
4000
6000
8000
10000
12000
Dec/31 Jul/2 Dec/31 Jul/2 Jan/1 Jul/2
SSD Tested by HPK and Funded by LAT
TestedPurchased
Date
| 2001 | 2002 | 2003
Sep 2003
INFN
ASI & Japan
Japan
“Tested” = Final Production step at HPK
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 8
2000
4000
6000
8000
1 104
Jan/2 May/3 Sep/2 Jan/1 May/3 Sep/1 Jan/1
LAT SSD Purchased by LAT / Tested & Shipped by HPK
ShippedTestedPurchased
Date
| 2001 | 2002 |2003
TKR SSD Production RealityTKR SSD Production Reality
| 2001 | 2002 |2003
GLAST LAT Project March 24, 2003
5C Tracker Peer Review, WBS 4.1.4 9
TKR SSD Procurement: ConclusionsTKR SSD Procurement: Conclusions
• Quality:- Outstanding
• Production:- ~500 - 700 per month
• Delivery:- 2 weeks after purchase possible
• Testing:- Flight at HPK and INFN Pisa- Irradiated test structures at Hiroshima
U.- “Cut-offs” for testing of assembly steps
• Concern:- Funding by ASI in Summer 2003
