Silicon Status

SI3 STATUS AT PURDUE Oct 11 1999

STATUS OF CLAMSHELL #1

Layer 1 / 2 first clamshell arrived Ithaca 9/8/99

STATUS OF CLAMSHELL #2

3/3 layer 1 mounted and tested
3/5 layer 2 mounted and tested

CLAMSHELL #2 IS ON HOLD PENDING REPLACEMENT PARTS SINCE 9/15/99

1 layer 2 ladder (FL202) has 55 opens no diamond added B56 NL2-25 in process at Purdue (one side is now wire-bonded) is intended as replacement part
1 layer 2 ladder (FL208) has cracked hybrid (about 150 p-side opens, + n-side opens) We are expecting replacement parts for this ladder (B83 East starter and B117/NL2-10 West starter) this week.

STATUS OF LAYER 3

18 ladders (126 wafers x2 L1+L2)
100% diamond disassembled
100% diamond cleaned for layer 3
100% v-beams fabricated and certified
15 (15) ladders complete with diamond
1 (1) ladders complete without diamond (FL314)
2 ladders remain to be built
10 (10)/18 ladders mounted, 10(9) tested
Fraction of all processing complete : 93%
STATUS OF L3 BY LADDER
- FL301 on cone OK (contaminated diamond)
- FL302 on cone OK (contaminated diamond)
- FL303 on cone OK (contaminated diamond)
- FL304 on cone OK (contaminated diamond)
- FL305 on cone OK (contaminated diamond, elevated p-stop current but stable)
- FL306 center contaminated diamond replaced elevated p-stop current but stable, awaits mounting
- FL307 on cone OK (elevated p-stop current but stable)
- FL308 center contaminated diamond replaced, awaits test
- FL309 on cone OK
- FL310 elevated p-stop current but stable, will repeat burn-in before mounting
- FL311 on cone no n-side strip isolation, large unstable p-stop current de-mounted and inspected. Some damage to RC/FE wire-bonds on n-side observed, not known if this occurred during mounting of de-mounting. Not known if this damage is indirectly related to problem with part. Optical inspection of detectors revealed no obvious cause of problem. (Opposite end of this ladder is fine). Will send to Cornell for evaluation.
- FL312 on cone (elevated p-stop current but stable)
- FL313 on cone (elevated p-stop current but stable)
- FL314 returned from Cornell last week. Tested fine. Flipped and pulled R/C FE suspect p-side bond (Kirk 10/8) Part now looking good. (Diamond still needs to be added to this part)
- FL315 elevated p-stop current but stable repeated burn-in over weekend
- FL316 OK awaits mounting
- FL317: not yet made, HL323 and HL407 are ready
- FL318, not yet made HL324 very high n/p currents, removed chipped wafer, glued new wafer to flex will send to Cornell for bonding.

STATUS OF LAYER 4

26 ladders (260 wafers x2 L3)
100% diamond disassembled
90% diamond cleaned for layer 4
10% of diamond was re-cleaned, 3 vees have been built and await test.
25 of 26 v-beams fabricated, 14 of 16 certified
7 (9) ladders complete without diamond
8 (4) ladders complete with diamond
0/26 ladders mounted,
Fraction of all processing complete : 75%

To complete L4 we need to build:

11 (12) Full Ladders (we have HL's for 7 (8)ladders fully processed (this total includes HL554 and HL512)
8HL need to be built ( 6 starters not yet at Purdue)

5 out of 8 wafer chains are ready

3 out of 8 wafer chains had 4^th wafer removed all are fine, will re-build WC's after WC building machine is put back under CMM

Recovery of HL512 (interrupted p-stop bias line) Have wirebonded to end of wafer with long wirebond, parts works well now. Recovery of HL554 (fried, at Cornell, status?)

STATUS OF LAYER 4 BY LADDER

FL401 diamond added Monday awaits test
FL402 needs retest before diamond added
FL403 awaits diamond
FL404 needs retest before diamond added
FL405 needs retest before diamond added
FL406 awaits diamond
FL407 needs retest before diamond added
FL408 diamond added 10/8 awaits test
FL409 damage noticed optically, awaits test
FL410 diamond added part OK for mounting
FL411 diamond added part OK for mounting
FL412 diamond added part OK for mounting
FL413 diamond part 10/6 OK for mounting
FL414 diamond added 10/6 West n/p side currents rising needs burn-in
FL415 built 10/8 , diamond added part awaits test