ATLAS Frame PRR 1 W.O. Miller Feb US ATLAS Pixel Detector Global Supports PRR W.O. Miller, R. Smith, W.K. Miller, R. Baer HYTEC G. Gilchriese, E. Anderssen, N. Hartman, F. Goozen LBNL Objectives: Disk Ring Status Production Readiness of Frame Components

ATLAS Frame PRR 2 W.O. Miller Feb US ATLAS Pixel Detector Nomenclature Center Frame Section (1) End Section (2 ) Internal End Cone (2) (B-Layer and Services not shown) Interior Barrel Layers (3) Disks (6 ) Disk Rings (6) Disk sectors (8)

ATLAS Frame PRR 3 W.O. Miller Feb US ATLAS Pixel Detector Disk Support Ring Ring Ring mount 8-sector disk Sector cooling tubes C-Channels 4 arc segments around the perimeter

ATLAS Frame PRR 4 W.O. Miller Feb US ATLAS Pixel Detector Disk Ring Production Production Activities –Mold Qualification: Phase I Precision compression molded C- Channels –Requires confirmation of cavity dimensions –2 outer and 2 inner C-Channels molded with YSH50/RS-3 cyanate ester resin –4 segments for the outer and 4 segments for the inner –1 st Article Ring Qualification: Phase II Presently inspecting graphite bonding fixture via CMM at LBNL Phase II activity will start in February 2002 Production Progressing as Planned Development Ring Tested in Disk Frame Section Confirmed our approach Mounting approach Mounting precision Repeatability of mounts Frame/mount stiffness

ATLAS Frame PRR 5 W.O. Miller Feb US ATLAS Pixel Detector C-Channel Mold (Segment) Silicone rubber forces the composite to conform to the mold profile—reversed the process from before

ATLAS Frame PRR 6 W.O. Miller Feb US ATLAS Pixel Detector C-Channel Mold Trials Typical Inspection Report for First Article Verification of critical dimensions Radii Toe-in In-grain twist Measurements taken as molded and after trimming Edges to be trimmed Inner and outer radii and arc length

ATLAS Frame PRR 7 W.O. Miller Feb US ATLAS Pixel Detector C-Channel Status Surface texture excellent Wall thickness well controlled Preliminary dimensional measurements look quite good- although this investigation is still proceeding –C-Channel not completely trimmed, ½ moon cut-outs for the ring bushings left off –Desired dimensional control in several areas 50 to 130 microns (2 to 5mils) –Dimensions are to be achieved after trimming one edge (radius) of the channel to the proper radius and two ends to form a 90 degree arc. Effect of mold strains –Part cures at elevated temperature in Al mold –Difference between as molded state and mold dimensions is evident –Difference after trimming the radius is more pronounced –More parts must be made to demonstrate consistency Results to date –Insufficient data to suggest a change in mold radius is necessary –Other dimensional features are quite good

ATLAS Frame PRR 8 W.O. Miller Feb US ATLAS Pixel Detector Global Support Frame PRR

ATLAS Frame PRR 9 W.O. Miller Feb US ATLAS Pixel Detector Global Supports-Readiness Tasks Completed Extensive design studies defining structural approach and material choices Prepared finite element model of complete system Static stiffness Dynamic stiffness (vibration) Torsional stiffness (insertion considerations) Prototyped Structures-(500mm diameter frame) Disk Frame Section End Cone Disk Support Ring and Mounts Conducted Individual Component and Integrated Tests Disk Support Ring with development sectors Disk Support Ring in Frame Section End Cone with Frame Section Completed CDR and FDR on all components Completed Production Drawings and Plans

ATLAS Frame PRR 10 W.O. Miller Feb US ATLAS Pixel Detector Topical Characteristics Global Support Structure –2.85kg composite sandwich structure, fully assembled with detectors and services estimated to be 26.8kg K1392U fiber/EX1515 Byrte Technology resin and graphite fiber honeycomb for maximum frame stiffness –Assembled by joining 3- subassemblies with self indexing features 2-Disk Sections 1-Barrel Section Interfaces Resolved End Cone to Barrel Shells (IVW) External mounts to Pixel Support Tube Space for Services: routing and egress End Plate End cone Disk Outer Frame

ATLAS Frame PRR 11 W.O. Miller Feb US ATLAS Pixel Detector Design Confirmation Studies Objectives –Demonstrate ability to predict microstrains to level necessary for qualifying stable structures –Confirm our predictions of static and dynamic stiffness Typical results –Frame sag ~12microns for 26.8kg –Frame natural freq. ~89Hz –Torsional sag- 3pt supports 61  m –Disk ring stiffness-1N load normal to ring 1.66  m/N

ATLAS Frame PRR 12 W.O. Miller Feb US ATLAS Pixel Detector End Cone Prototype Salient construction points –End Cone for 500mm frame design –P30Carbon-carbon facings, ~0.44mm –XN50/cyanate ester graphite fiber honeycomb, 4mm thick –YSH50 quasi- isotropic laminate for outer supports and inner tabs Static component tests Individually, as well as mounted on frame White paint on short tab for holographic measurements

ATLAS Frame PRR 13 W.O. Miller Feb US ATLAS Pixel Detector LBNL test results with end cone in place –Axial load 1.125inch from end of long tab  m/N HYTEC end cone separately –Axial load 1.125inch from end of long tab-- 16  m/N End Cone/Frame Test Note disk sector support ring Barrel section mounting tabs and dial indicator measuring displacement 12 Sector Frame-500mm dia.

ATLAS Frame PRR 14 W.O. Miller Feb US ATLAS Pixel Detector Now that prototype investigations and final drawings have been completed Frame Procurement Steps Remaining tasks Leading to Release of Procurement Orders are: –Review and incorporate comments from PRR –Finish detail drawing review –Release drawings and post in EDMS –Review letters of interest from prospective vendors Resolve any concerns about LBNL supplied tooling Procurement Orders –Release Request For Quote (RFQ) to composite fabricators –Release RFQ(s) for tooling –Select composite fabricator(s) and tooling vendors Assembly and QC Plans –Work with vendor (s) to produce a coordinated fabrication and assembly plan In process inspection at vendors and LBNL Posting of the final plan documents in EDMS –Complete assembly and inspection at LBNL

ATLAS Frame PRR 15 W.O. Miller Feb US ATLAS Pixel Detector Schedule Disk Support Ring and the Global Support Components Delivery Schedule is doable, but tight