uhv cleanliness requirements cleaning baking and contamination control
Download
Skip this Video
Download Presentation
UHV Cleanliness Requirements: Cleaning/Baking and Contamination Control

Loading in 2 Seconds...

play fullscreen
1 / 8

UHV Cleanliness Requirements: Cleaning/Baking and Contamination Control - PowerPoint PPT Presentation


  • 429 Views
  • Uploaded on

UHV Cleanliness Requirements: Cleaning/Baking and Contamination Control. Dennis Coyne HAM-SAS Bidder’s Conference @ LIGO Laboratory, Caltech 25 October 2005. Livingston, LA. Hanford, WA. Basic UHV Compatibility Requirements. Cleanliness Requirements:

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 'UHV Cleanliness Requirements: Cleaning/Baking and Contamination Control' - Mercy


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
uhv cleanliness requirements cleaning baking and contamination control
UHV Cleanliness Requirements:Cleaning/Baking and Contamination Control

Dennis Coyne

HAM-SAS Bidder’s Conference

@ LIGO Laboratory, Caltech

25 October 2005

Livingston, LA

Hanford, WA

LIGO R&D

basic uhv compatibility requirements
Basic UHV Compatibility Requirements
  • Cleanliness Requirements:
    • Achieve a Non-Volatile Residue (NVR) level of A/50 or better (per MIL-STD-1246C or IEST-STD-CC1246D) on piece parts before clean assembly
    • Achieve a Particulate Cleanliness Level of 50 or better (per MIL-STD -1246C or IEST-STD-CC1246D) on piece parts before clean assembly
    • Perform clean assembly and all steps through UHV Packaging in a Class 100 Clean Room (per FED-STD-209)
    • Comply with Contamination Control Protocols defined in E048228 (M990034 is also a good guide)
    • Package the Clean Parts per E048227
  • No Virtual Leaks
    • Full Penetration Welds
  • No Cold Welding
    • Stainless fasteners into Aluminum
    • Silver coated Stainless Fasteners into Stainless
    • Oversized pilot and tap for tapped holes

LIGO R&D

ultra high vacuum uhv cleanliness requirements related to manufacturing processes
Ultra-High Vacuum (UHV) Cleanliness Requirements Related to Manufacturing Processes

Notes:

The process sequence depicted here is suggestive, and not meant to be prescriptive.

Loaded GAS Filter, Spring Blades to be Creep Relaxed in Air Bake

LIGO R&D

practical uhv requirements
Practical UHV Requirements
  • Must pre-clean parts before welding and winding
  • Must clean parts multiple times during fabrication
  • Must thoroughly clean parts!
    • “gross” clean with solvents and acids
    • Mechanical clean (scrub) parts especially tapped holes – multiple times, with powered rotary tool – during “gross” and “precision” clean steps
    • “precision” clean with hot, water soluble detergents (steam or hot water spray) – multiple times
    • Never let parts dry with detergent
    • Multiple rinses with Deionized water
  • Must bake parts (air or vacuum) after “precision” cleaning
  • Must maintain parts in a class 100 clean room
    • or keep wrapped in “UHV Foil” and keep in at least a class 10,000 clean area)
    • limit exposure, keep wrapped /covered when possible
  • Must Control Contamination with Good Clean Room Practice
    • All tools must be cleaned, air baked, wrapped & kept in Class 100 areas
    • All personnel must wear full clean room garb, including hair net, face mask and gloves

LIGO R&D

uhv requirement references
UHV Requirement References
  • Particulate Level 50 and NVR Level A/50 per MIL-STD-1246C or IEST-STD-CC1246D
  • Cleaning for UHV Service:
    • Contractor is to certify the cleaning and baking process with representative parts to demonstrate 1246 Level 50-A/50
      • NVR Level to be confirmed via FTIR (Fourier Transform Infrared analysis)
      • Particulate level to be confirmed by particle sizing and counting or equivalent particle area coverage
    • LIGO Lab will independently assess the contractor’s cleaning/baking process with representative parts by RGA (mass spectrometer outgassing analysis) per E960022
    • Guidance: E048225, Process Specification for Ad-LIGO Seismic Isolation System In-Vacuum Mechanical Elements: Fabrication (includes cleaning)
  • Contamination Control:
    • Per E048228, Process Specification for Ad-LIGO Seismic Isolation System In-Vacuum Mechanical Elements: Contamination Control
    • Additional Guidance:
      • M990034, LIGO Contamination Control Plan
      • FED-STD-209, Airborne Particulate Cleanliness Classes in Cleanrooms and Clean Zones
      • ISO-14644, Cleanrooms and controlled environments[ISO-14644 superceeds FED-STD-209]
  • Packaging:
    • Per E048227, Process Specification for Ad-LIGO Seismic Isolation System In-Vacuum Mechanical Elements: UHV Packaging

LIGO R&D

clean room gowning room
Class 100

Clean Room

Class 10,000

Room

HEPA Filter

Gowning Room

“Sticky” Mat

Clean Room & Gowning Room

LIGO R&D

ham chamber clean rooms
HAM Chamber Clean Rooms

“Full” Clean Room Dress

Concrete Floor – Cleaned Routinely, not ideal, but serviceable

LIGO R&D

uhv foil
UHV Foil

Annealed (baked) UHV Aluminum Foil for Wrapping Parts

LIGO R&D

ad