vacuum science and technology in accelerators l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Vacuum Science and Technology in Accelerators PowerPoint Presentation
Download Presentation
Vacuum Science and Technology in Accelerators

Loading in 2 Seconds...

play fullscreen
1 / 35

Vacuum Science and Technology in Accelerators - PowerPoint PPT Presentation


  • 240 Views
  • Uploaded on

Vacuum Science and Technology in Accelerators. Ron Reid Consultant ASTeC Vacuum Science Group (r.j.reid@dl.ac.uk). Session 7. Components and Construction Techniques. Aims. To examine constructional techniques of particular relevance to vacuum performance.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Vacuum Science and Technology in Accelerators' - Lucy


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
vacuum science and technology in accelerators

Vacuum Science and Technology in Accelerators

Ron Reid

Consultant

ASTeC Vacuum Science Group

(r.j.reid@dl.ac.uk)

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

session 7

Session 7

Components and Construction Techniques

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

slide3
Aims
  • To examine constructional techniques of particular relevance to vacuum performance.
  • To understand why some standard vacuum components are designed in the way that they are.

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

vacuum seals
Vacuum Seals
  • Every accelerator incorporates many demountable vacuum joints. Clearly these have to be reliable.
  • The seal is the most unreliable part of such joints.
  • Seals are made of elastomers or metals.
  • The requirements are that the seal is deformable, elastic and stable.
  • In accelerators, radiation resistance of seal materials can be of importance.

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

elastomers
Elastomers
  • Suitable elastomers include
    • Buna N
    • Neoprene
    • Fluoroelastomer (VitonTM)
    • Silicone
    • PTFE
    • Polyimide (VespelTM, KalrezTM)

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

elastomer seals
Elastomer seals
  • Limited temperature range
    • Buna N, Neoprene ~ 85oC
    • Viton ~ 150oC
    • Polyimide, PTFE ~ 275oC
  • Limited radiation reistance
    • PTFE – poor
    • Viton – moderate
    • Polyimide - reasonable

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

elastomers7
Elastomers

Permeation

Compression set

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

elastomer seal configurations
Elastomer seal configurations

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

metal seals
Metal Seals
  • Copper
  • Gold
  • Aluminium
  • Tin
  • Indium

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

metal seals10
Metal Seals
  • Metal O-rings (usually called wire seals) can be used in the same configurations as elastomer seals (except “L” seals) when higher temperatures are required.
  • In addition, there are three important types of seal
    • “Diamond”
    • Knife-edge
    • HelicoflexTM

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

metal seals11
Metal Seals
  • Diamond seal

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

metal seals12
Metal Seals

HelicoflexTM

Knife edge - ConflatTM

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

knife edge seals
Knife edge seals

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

metal gasket material
Metal Gasket Material
  • “Copper”
    • OFHC
    • OFS (0.1% Silver)
    • Silver plated
  • Helicoflex
    • Many different metal sealing jackets available

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

flanges
Flanges
  • Material as for vessel construction
    • Harder than seal
    • For wire and diamond seals, roughness should be ~ 1μ
    • Lap finish should be parallel to the seal run
  • Knife edge (“ConflatTM”) flanges
    • N hardened aluminium
    • 304 or 316 Stainless steel
    • For highest reliability, 316LN should be used

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

metal stock
Metal Stock

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques
Construction Techniques

Brazing

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques18
Construction Techniques

Welds

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques19
Construction Techniques

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques20
Construction Techniques

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques21
Construction Techniques

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques22
Construction Techniques

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

construction techniques23
Construction Techniques

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components
Components

Windows (Viewports)

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components25
Components

Feedthroughs

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components26
Components

Motions (Rotary)

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components27
Components

Motion (Linear)

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components28
Components

Bellows

Edge welded

Formed

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components29
Components

Shielded Bellows

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components30
Components

Right Angle Valve

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components31
Components

Gate valve

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

components32
Components

RF Shielded Gate Valve

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

lubrication
Lubrication
  • Lubricants may be required for bearing surfaces, especially in UHV where cold welding can occur.
  • Moving surfaces in contact should be designed so that the possibility of galling or scraping is minimised.
  • Lubricants should be chosen so that the vapour pressure is sufficiently low e.g. ptfe greases, FomblinTM oil or, better solid lubricants should be used

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

lubrication34
Lubrication
  • Solid lubricants
    • PTFE
    • Graphite
    • MoS2
    • Implanted Lead
    • WSe2 or WS2

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007

slide35
In an accelerator there can be many moving components – valves, shutters, beam stops, scrapers, septa, beam monitors.
  • These are the components most susceptible to leaks and so must be designed and operated with care.
  • Care has to be taken regarding the generation of particulates. This can only be done by good design.

Vacuum Science and Technology in Accelerators

Cockcroft Institute Lectures - 2007