NCSX Vacuum Vessel Overview

Paul Goranson

WBS 12 Manager

Vacuum Vessel Manufacturing Study Kickoff meeting

April 29, 2003

P Goranson, 29 Apr 2003 NCSX vacuum vessel

TOPICS NCSX Baseline Design

Status- Impact of PDR Delay

- Models

- Drawings

- PVVS Spec

- VVSA Spec Changes to Baseline

- Vessel Joint Change

- Vessel Contour Change

- Port Changes

- Ribs Removed from Task VVSA Spec Run Through

P Goranson, 29 Apr 2003 NCSX vacuum vessel

National Compact Stellarator Experiment NCSXBaseline Device Assembly

< R0 > = 1.4 m, Btor = 2 T, A = 4.3, Ip < 350 kA

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Vacuum Vessel Sits Inside the NCSX Baseline Coil Set

Vacuum vessel

TF Coil

VacuumVessel

ModularCoil

Coil SupportStructure

Vessel PortExtensions

VesselSupport

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Baseline Vacuum Vessel Assy concept

Shell material Inconel 625

Thickness 9.5 mm

Time constant 5.3 ms

Total wt w/ports ~ 12000 lbs

Bolted joints connect field periods

Traced with He gas lines for heating (to 150C) and cooling

Solomide foam insulation between VV and cold mass

99 separate access ports

Spacers used between field periods to provide fit-up capability

Spacer

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Vessel fabrication concept

Full field period with port stubs

Individualpanels

Half field period(repeats 6 times to form complete shell)

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Field period assembly concept

PortExtension

Vessel is fabricated in field periods Modular coils are rotated over field period, then port extensions are welded on Vessel is as large as possible consistent with these operations

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Port extension / reinforcement concept

1. Weld on port extension and leak check weld

Torus shell

Port extension

2. Cut port extension off and after final torus leak check, cut opening thru torus

Torus shell

Port extension, part 1

3. Prep edges (Supplier) and weld port extension in place with full penetration weld from inside ( PPPL)

Torus shell

Port extension, part 1

Port extension, part 2

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Vacuum Vessel Manufacturing Study is Phased

PVVS 20 degree segment evaluates fabrication

VVSA 120 degree field period follows

P Goranson, 29 Apr 2003 NCSX vacuum vessel

PVVS is simplified segment of VV from 10 to 30 degrees

P Goranson, 29 Apr 2003 NCSX vacuum vessel

Data is provided in Pro-E models, drawings, STEP files and drawings in pdf format

P Goranson, 29 Apr 2003 NCSX vacuum vessel

STATUS - PDR DELAY

MINIMAL IMPACT ON VESSEL Coil changes may cause small changes to

vessel contour (fractional inches) No changes to ports No fabrication cost impact

Vessel models redesigned to be robust New ProE tools in place Fast turn around time

P Goranson, 29 Apr 2003 NCSX vacuum vessel

STATUS - PDR DELAY CONTIN. Schedule not impacted significantly

Continue to do planning, scheduling, costing with current release of specification and drawings

Revised versions of specification and drawings will be provided prior to start of prototype fabrication

Only anticipated changes will be revision to file names and models

Budgetary estimate schedule needs discussion

P Goranson, 29 Apr 2003 NCSX vacuum vessel

STATUS - MODELS

Vessel contour updated Integrated into vessel assy model

P Goranson, 29 Apr 2003 NCSX vacuum vessel

STATUS - DRAWINGS PVVS (20o segment)

Being Revised to Reflect Change in Ribs, Now Optional Feature

Updated Vessel Contour Being Incorporated This Week

VVSA (120o degree field period) Updated Vessel Contour Being Incorporated Next Two

Weeks Vessel Contour Will Be Further Updated As Required

After Design Final Clarification of Tolerances (match up of spacer to vessel)

P Goranson, 29 Apr 2003 NCSX vacuum vessel

STATUS - PVVS(20o) BUILD-TO SPEC

Spec will be revised Incorporate Updated Contour

Present drawings adequate for scheduling and costing

P Goranson, 29 Apr 2003 NCSX vacuum vessel

STATUS - VVSA(120o) BUILD-TO SPEC

Spec comment copy complete Sufficient for estimating, planning

P Goranson, 29 Apr 2003 NCSX vacuum vessel

CHANGES - Field joint is being modified from current design to avoid assembly interference

Vertical assembly flange showing interference with mod coil during assembly operation

Possible solution by tilting assembly flanges 25-30 deg off vertical

25-30 deg

VV interferes with modular coils during assy of three field periods

P Goranson, 29 Apr 2003 NCSX vacuum vessel

CHANGES - Modified Field Joint Does not Hamper Assembly

VV segments assembled VV segments retracted

P Goranson, 29 Apr 2003 NCSX vacuum vessel

JOINT DESIGN IS PRELIMINARY

Decision has not been made on joint design Costing should be based on slanted , bolted

field joint

P Goranson, 29 Apr 2003 NCSX vacuum vessel

CHANGES - Vacuum Vessel Surface Contour Has Evolved

New tools permit definition of stay in, stay out zones

- Prevent interference with Coils

- Maintain distance from plasma

- Maximize plasma

Contour chance is subtle

- Should not affect manufacturing

- Slightly less smooth

P Goranson, 29 Apr 2003 NCSX vacuum vessel

VESSEL CONTOUR CHANGE

CDR Contour Revised Contour

P Goranson, 29 Apr 2003 NCSX vacuum vessel

VESSEL CONTOUR CHANGE

CDR and Revised Contour Superimposed

P Goranson, 29 Apr 2003 NCSX vacuum vessel

VESSEL CONTOUR CHANGE

CDR Contour Revised Contour

P Goranson, 29 Apr 2003 NCSX vacuum vessel

VESSEL CONTOUR CHANGE

CDR and Revised Contour Superimposed

P Goranson, 29 Apr 2003 NCSX vacuum vessel

PORT CHANGES Port P4 modified

- Hour glass shape

- Reoriented

P4

P Goranson, 29 Apr 2003 NCSX vacuum vessel

CHANGES - Ribs Removed From VVSA

Welded ribs will not be utilized

Ribs will be attached as upgrade to vessel by PPPL