M. Gilchriese

Overview of Production Plan for Pixel Global Support and Disk

Support Rings

M. G. D. Gilchriese

Lawrence Berkeley National Laboratory

February 18, 2002

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Disk section

Barrel Section

Disk Support Rings and Sectors

Global Support and Disk Rings

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Production Overview

• Disk Support Rings and Global Support Frame are U.S. responsibilities.

• Procurement of these items will be done via Lawrence Berkeley National Laboratory(LBNL).

• Documents referenced in ATL-IP-QA-0010(“ATLAS PIXEL DISK SUPPORT RING AND GLOBAL SUPPORT PRODUCTION PLAN “) and included as appendices to ATL-IP-QA-0010 are provided to the production vendors.

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Disk Support Rings• Procurement is divided into three Phases(I, II and

III) and two contracts(I+II and III)– Phase I – produce C-channels that meet specifications– Phase II – produce one pre-production ring– Phase III – fabricate production rings, currently six

• A fixed-price contract for Phase I and Phase II was placed in November 2001 calling for completion of Phase I by March 7, 2002 and completion of Phase II by April 4, 2002.

• We are on schedule to complete Phase II and inspection of the pre-production ring by the end of April, at which point the production contract would be let with the goal of completing fabrication by October 2002.

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Global Support Frame• The procurement of the Global Support Frame is planned to

proceed in two major(possibly overlapping) phases.– Separate contract(or contracts) for the production of tooling

– A contract for composite fabrication and assembly.

– By doing so, we can benefit from the extensive and proven methods used in the construction of prototypes and likely reduce costs.

• Appendix D in ATL-IP-QA-0010(“ATLAS Pixel Detector Global Support Structure Procurement and QC Plan”) has been provided some weeks ago to prospective composite vendors as part of a request for expressions of interest to bid and to advance the procurement process.

• We plan to begin the formal process to obtain bids just after this review.

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Baseline Schedule• Key milestones from our baseline schedule established last Fall

are given below.

• There is a substantial period of trial assembly, including machining of the Frame disk sections for insertion of the Disk Rings. And we had planned for a significant slack, about 7 months.

• W. Miller will present our current estimate of the schedule later.