# Presentation: 128341

## Phased Cone Proposal

**Phased Cone Proposal**

- Eric Anderssen, LBNL

## Overview

- These are just ‘Cartoon CAD’ models
- Detail dimensions need to be worked out with West Cone/FGT
- While they are ‘cartoons’ I tried to get the right number of basic parts
- Fasteners other than glue are not included, but will indicate bolted/pinned joints
- Most parts similar to ATLAS Pixel Support Tube
- Could build in short order after dimensions are finalized...
- Should wait to assure IST/ISC/Pixels/FGT do not impose auxiliary constraints
- Neighboring parts cannot lag by more than one CD...

## Cut Apart Current Cones next Summer

- Old East Cone and most of Beams to be reused to support New West Cone
- Old West cone refurbished into New East Cone in Berkeley
- Cut location in Carbon Beam away from Al Insert—details later
- Should probably cut more accurately than indicated...

*Send to Berkeley*

*Keep at Brookhaven*

## Modified East Cone

- View as Temporary Fix—Should be ACAP (as cheap as possible)
- Supports end of New West Cone/FGT
- Replicates Old Beam Pipe Interfaces
- Includes SSD if required
- Only for summer ’08 to ‘09
- Wholly Machined/Bonded Solution
- Tooling to locate Buck Plate while bonding is required...

*Buck Plate aimed for*
*Easy Swap of replacement*

*Some Tooling Required...*

*~1.5m*

## Make a Low Mass ‘Buck Plate’

**Make a Low Mass ‘Buck Plate’**

- Coupling Insert reduces risk of large complex machined plate
- Quicker to modify smaller part if needed...
- Insert can take up mis-match in geometry of current Beam and match to ‘perfect geometry’ of machined plate (bonded)
- Plate includes SVT mounts and all other interfaces of current plate, Machined directly into features
- Mass Approx Equal to current Plate

*Beam*

*Plate*

*Coupling*
*Insert*

*Needs to include*
*Beam Pipe Mount*
*And other interfaces*

## Plate Needs to Make up Cut Lengths

- Lengths just guessed—need FGT/West Cone to do better
- Cut placed just past insert—easier to cut, cleaner bond
- May need to find way to couple to outer skin of Beam
- Not done with current Beam

## Goal—Swap-in Replacement

*Should Be*
*Same Length*

*New East Cone with Cylindrical Shell made from Old West Cone*
*Swap in by matching Bolted Interface to New West Cone...*

*Modification*
*Will Take Up*
*Length...*

*Include SSD interface On Shell*

## Old West Cone Modification--Flanges

**Old West Cone Modification--Flanges**

- Cut Back Length Determined by MFG Radii of new Flanges—also allowance for  Bolt Flange Radii

## Flange on New East Cone

- Auxiliary Goal of Flange Two-Fold
- New Interface to Cone (remove old BP Interface Plate)
- Use Same Tool for large cylinder of IST and Intra-Cone Cylinder (SSD Support Shell)
- Small Taper Angle necessitated larger cut back
- Still only 120mm—easy to make shells shorter/longer with same tool

*Gap or Standoffs for *
*IST Services Needed*

*R220-225*

## Some Cost Benefit Analysis

- Cost of Re-use of (ye) Olde East Cone is a good bet
- Need something to support FGT and BP for Run 9 (10?)
- Minimal Mod, Tooling and Part count to use old Cone and beams
- Likely under $25k parts/tool—just labor to bond at BNL
- IST needs a large Cylinder
- Intra-Cone Cylinder only marginal cost of fabrication if same diameter
- Flange Tooling similar, additional design work minimal
- Cost of Re-Using old West Cone uncertain—it is a Renovation
- Geometry may be uncertain enough to cause refab of tooling
- Risk of Damage during trim to new length—errors/damage may need again more tooling
- Should investigate marginal cost of making New East Cone using West Cone Tooling
- Tooling costed in FGT—only cost of part fab
- Balance against cost/risk of old west cone renovation

## Proposal/Conclusion

- Baseline should be what is outlined here
- Modified East Cone with requirement for bolt-in swap
- Modified West-Cone as new East Structure
- Would like agreement (decision) on this as the approach
- Main requirement here is common bolted interface and quickly reaching length-and diameter interfaces
- Allows Detailed cost studies to proceed
- This Gives FGT and the NWC a clear interface to meet as early as possible
- Simple mechanical interface—lengths and Bolt Circles are easy to track even when they change...
- Keep open the issue of how the New East Cone is implemented
- Proposed baseline has its risks
- New West Cone may be an attractive option over refurbishing Old West Cone
- This should be the ‘backup’ solution—still need to understand what it looks like/costs