M. Gilchriese - April 2001

Disk Sector Status

M. Gilchriese - April 20012

Technical Status• Three prototypes to current dimensions(8-sector disks) except

for tube length made or will be done by next week.

• One with CGL and two with epoxy(AIT EG7658) between Al tube/faceplate.

• So far, sectors made with CGL meet all specs. Epoxy is backup in case we find difficulties during production. Don’t have time to completely qualify sectors with epoxy before PRR.

• Has been little additional testing in last months. – “Loss of coolant” test at room temperature of irradiated sector. Sector

reached 135oC, steady state, held for some minutes and then coolant turned on. Thermal performance still OK.

– Irradiated sector piece exposed for weeks to 100% C3F8 vapor at room temperature. No effect seen in thermal performance.

• All old(FDR) requirements met by baseline design

M. Gilchriese - April 20013

Technical Status(2)• Thermal shock to -35 needs to be done

• This would require new set up(LN2 vapor?), that doesn’t yet exist.

• Also use for thermal cycling?

M. Gilchriese - April 20014

Disk Sector Production Page

M. Gilchriese - April 20015

Status(1)• Requirements(Gil)

– Revised version sent to Marco

– Needs final checking, global changes(eg. fault conditions)

• Interfaces(Eric/Gil)– FDR version “marked up”. Needs new drawings, grounding defined..a

number of changes

• Drawings(Dave, Jon, Eric)– Preliminary set of drawings complete(Dave, Eric, Jon)

– Detailed list of outstanding fabrication and tooling drawings/figures made(Eric/Jon) and in progress. Next complete update by end of May?

– Tolerances and other information(Eric). Will be largely included in revised drawing set.

• Schedule(Gil, Jon, Mike)– Preliminary baseline schedule complete. Next update by mid-June, for

PRR.

M. Gilchriese - April 20016

Status(2)• Component purchases(Jon, Gil)

– Production tubes on order, delivery by June

– Production carbon-carbon plates ordered, first inspection(before heat treatment and CVD) complete(OK), processing progress.

– Foam just ordered

– Miscellaneous materials(adhesives, etc) to be ordered

– Mounting button material still not finally fixed yet. PEEK, C-filled PEEK or C-C.

• Vendor QC/QA– Allcomp visited, plates inspected, travellers with each plate OK

– Allcomp will also make CVDed foam. QC to be worked out but is essentially weight of each piece.

– No other significant vendor QC/QA

M. Gilchriese - April 20017

Status(3)• QC/QA at LBL(Gil, Jon)

– Preliminary ATLAS part number ID made

– Draft individual travellers complete for• aluminum tubes

• faceplates

• assembled sectors

– Will be batch travellers(not each part) for fittings, strain relief pieces, hardpoints

– Detailed QC procedures for each piece/assembly(what to measure) largely exist and have been tried on prototypes but need to be formally documented in “how to” manual.

– Summary QC/QA document for PRR needs to be written, mostly referring to these more detailed procedures, etc.

M. Gilchriese - April 20018

Status(4)• Production personnel

– Primarily Jon and Tom

• Current plan– Start pre-production in July

– Produce enough sectors to populate one disk

– Test

– Go ahead for full production Jan. ‘02