status10/6.html

SI3 STATUS AT PURDUE Oct 6 1999

STATUS OF CLAMSHELL #1

STATUS OF CLAMSHELL #2

CLAMSHELL #2 IS ON HOLD PENDING

REPLACEMENT PARTS SINCE 9/15/99

1 layer 2 ladder (FL202) has 55 opens we have not added diamond to this yet 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 perhaps next week? (See Fred's e-mail of 10/5, B83 East starter and B117/NL2-10 West starter being assembled at Cornell now)

STATUS OF LAYER 3

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 probably need to de-mount and inspect part but will burn-in tonight in case we get lucky)
FL312 on cone (elevated p-stop current but stable)
FL313 on cone (elevated p-stop current but stable)
FL314 returned from Cornell today will test, Then evaluate ladder flip procedure and R/C FE p-side bond pulling. If comfortable proceed to pull suspect channel identified at Cornell. If not comfortable use part as is (diamond still needs to be added to this part)
FL315 elevated p-stop current but stable will repeat burn-in before mounting
FL316 OK awaits mounting
FL317: not yet made, HL323 and HL407 are ready
FL318, not yet made HL324 very high n/p currents needs replacement wafer part at Cornell, will be shipped this week.

STATUS OF LAYER 4

26 ladders (260 wafers x2 L3)
100% diamond disassembled
90% diamond cleaned for layer 4
10% of diamond is still conductive after cleaning. These parts have been re-cleaned, and were probed yesterday and look good
25 (22) of 26 v-beams fabricated, 14 of 16 (13 of 15) certified
10 (9) ladders complete without diamond
4 (3) ladders complete with diamond
0/26 ladders mounted,
Fraction of all processing complete : 70%

To complete L4 we need to build:

12 (14) Full Ladders (we have HL's for 8 (10)ladders fully processed (this total includes HL554 and HL512)
8HL need to be built ( 6 starters not yet at Purdue)
6 out of 8 wafer chains are ready
2 out of 8 wafer chains have problem with 4th wafer which was removed. Status: part tested fine after removal of problematic 4th wafers in each case: wil re-build WC's after WC building machine is put back under CMM
Discovery that 1 wafer chain had every other wirebond missing on n-side for last wafer. Have removed wafer and will add a new wafer at opposite end next week
Recovery of HL554 (fried, at Cornell, status?)
Recovery of HL512 (interrupted p-stop bias line, crack- now at Purdue part in process

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 awaits diamond
FL409 damage noticed optically, awaits test
FL410 diamond added part OK for mounting
FL411 diamond added part OK for mounting
FL412 diamond added, handling problem caused short between GR and p-stop (hard-short) identified and corrected (nice job by Kirk and Jik) part OK for mounting
FL413 diamond added Monday awaits test
FL414 ladder built this morning- now being inspected before diamond added