IFE Plant Structural Concepts Including

Shielding and Optical Stability Requirements

Thomas Kozub, Charles Gentile, Irving Zatz - PPPL

2

HAPLHAPLOverview

• Conceptual Development of an Integrated IFE Facility Structural Design

• Incorporates Several Interconnected Design Requirements:– Basic Structure for Facility Core– Provide Stable Platform for Optics– Provide Necessary Shielding– Incorporate Methods for Plant Servicing– Meet all Regulatory Requirements

• All Elements are Integrated into an Single Efficient Design

3

HAPLHAPL

Conceptual Structural Design(with current MI core design)

4

HAPLHAPLView with Dome and Outer Wall Removed

5

HAPLHAPLIFE Plant Model Section Views

6

HAPLHAPLGeneric Structural Design

• Major facility dimensions are fixed as determined by optical geometry and shielding requirements

• Any reactor chamber core design that fits within the 40m diameter bio-shield can be accommodated with this design

• Integrated multifunctional use of components to efficiently meet multiple requirements

7

HAPLHAPLFundamental Design

• The basic design is very simple, a combination of spheres and cylinders. The inner most concrete structural component is the spherical “bio-shield” which contains and supports the reaction chamber and all associated components. The bio-shield is contained within a larger structural sphere composed of the interconnected GIMM outer supports struts and connected to the bio-shield through the GIMM shielding units. This spherical GIMM shield support structure is integrated into a series of cylinders carrying the load to the foundation. These cylinders are interlinked with radial arches.

8

HAPLHAPLFundamental Design

• For the tulip magnetic intervention concept, the suggested vessel chamber is a cylinder with hemispherical ends. This geometry will contain all necessary core components while minimizing vacuum volume and will fit completely through the service opening.

9

HAPLHAPLAnalysis Methodology

• Optimize the static structural design to withstand dead loads and mechanical loads.

• Perform a modal and, if necessary, a frequency and transient analysis to determine the structural adequacy of the design subjected to dynamic loads.

• If necessary, optimize the design of GIMM and other relevant components to assure performance will be within the specified displacement and vibration criteria.

• Optimize material utilization and function.

10

HAPLHAPLFEA Model

11

HAPLHAPLOptical Platform Stability

• Design Requirements:– Static support of the GIMM structures to the facility's

foundation.– Structural elements to maintain stability and alignment within

the prescribed tolerances of the optical components.– A GIMM base that provides a mirror surface flatness to a

quarter wavelength.– Elimination of high frequency vibration at GIMM that is

beyond the dynamic tracking response of the steering mirrors.

– Methods for mounting the GIMM within the vacuum beam duct at the several various required orientations.

– Necessary features for the installation, adjustment, servicing and replacement of the GIMM components.

12

HAPLHAPLCurrent GIMM Geometry

3m

GIMM, M1

focusing dielectric, M2

plane dielectric turning mirror, M3

10deg closest location of M3

furthest location of M3

blanketmain containment   (concrete) vacuum duct

22.5m

20m

12.25m10m

24m

33m

14.9m

71cm

81cm

77cm

1.6m

6.0m

60cm

46cm30cm

5.2m

focusing mirror M2

turning mirror M3

GIMM M1

1.39m2.46m 3.05m

4.38m

HAPL GIMM design of 3-31-06

Drawing by Malcolm McGeoch

13

HAPLHAPLGIMM Structural Shielding Block Unit Section

14

HAPLHAPLGIMM Vibration Isolated Base Support

15

HAPLHAPL

GIMM Shield Units form an Integrated Structural Component of the Facility Providing the Dual Functions of Load carrying

structure and shielding

16

HAPLHAPLSources of Vibration

• Reducing the sources of vibration to an minimum is as important as the attenuation of vibration.

• Sources of vibration grouped by strength of coupling to the GIMM:– Sources acting directly on the GIMM.– IFE Process sources acting on the central core

structure.– Facility and other sources dispersed throughout

the plant.

17

HAPLHAPL

Sources of Vibration Acting Directly on the GIMM

• Thermal shock from target detonation– Impulse at rate ~5Hz

• Thermal shock from laser pulse– Impulse at rate ~5Hz

• Flow of GIMM coolant– Continuous source

• Electromagnetic effects– To be determined

18

HAPLHAPL

IFE Process Sources of Vibration Through the Facility Structure

• Target detonation impulse– Ion, radiation and thermal impulse at ~5Hz

• Magnetic Intervention field pulse– Field force response into structure at ~5Hz

19

HAPLHAPLFacility and Other Sources of Vibration

• Rotating machinery: pumps, motors, etc.• Valves operating• Fluid flow through pipes• Transformers and other electrical devices• Elevators, cranes, trucks, doors• External sources through foundation• Atmospheric and Seismic

20

HAPLHAPLPrimary Servicing Design

• Dome incorporates a large crane with a 1500 ton capacity (Typical “ship yard” type)

• Upper level platform for locating large service components of up to 1500 ton each

• Upper four GIMM shield units are removable• Bio-Shield incorporates a 22m removable plug

for vessel access

21

HAPLHAPL

Example illustrations with and withoutremovable core components

22

HAPLHAPL

Major Service Loads(Current MI Design)

• Mirror Shield Unit 1200 ton• Bio-Shield Plug 1100 ton• Vessel Dome 500 ton• Vessel Cylinder 1000 ton• MI Core Components <500 ton each

23

HAPLHAPLConclusions

• This design strategy provides a scalable and flexible approach to meeting the structural requirements of an evolving project.

• This design efficiently incorporates the required shielding materials into the core structure providing increased stability and functionality

• This design rigidly binds together critical components and infrastructure while minimizing the effects vibration.

24

HAPLHAPLFuture work

• Complete static load and vibration mode finite element analysis

• Optimization and volume reduction of structural elements

• GIMM mounting:– Vibration isolator design– Refinement of the GIMM shield units– Cooling methods minimizing vibration– Servicing features and details

• Integrated facility structural details