SEM EDS Analysis of Contamination from Ultrasonic 4.07.11 SRF Research Development Rs = G/ Q0 AH ext= NΦ0 K n = 2e 2 V n 2 /mω 2 g d 2 P diss.

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Presentation transcript:

SEM EDS Analysis of Contamination from Ultrasonic SRF Research Development Rs = G/ Q0 AH ext= NΦ0 K n = 2e 2 V n 2 /mω 2 g d 2 P diss = ½ AR s H 2

Sample prep  Samples of unknown particulate were brought to IB3. Particulate was on a ‘clean-room’ wipe.  Particulate transferred to conductive surface using double-sticky carbon tape.  Carbon tape mounted on large copper sample for ease of viewing.

EDS: Energy Dispersive x-ray Spectrometry Primer  Energetic electrons strike a sample and yield a number of by-products including x- rays.  X-rays have characteristic energies/wavelengths that can then be detected.  Recall that energy is related to wavelength:  E=hc/λ or E= 12.4/λ

EDS  X-rays are collected with a liquid nitrogen cooled solid state detector.  Qualitative elemental analysis is done to determine which elements are present and their relative abundance.  Problems: Incorrect sample geometry: needs to be tilted toward detector Contamination- the biggest problem Artifacts: escape peaks from detector- SiLi crystal

SEM Image of Sample 1

EDS Area for Analysis

Analysis Results From Sample 1 Area ElementWeight %Atomic % S Cr Mn Fe Co Ni Tb Ho

Sample 2 Note that Size > 1 mm

Analysis Results from Sample 2 Area ElementWeight %Atomic % Cr Fe Total100

SEM Image of Sample 3

EDS Area of Sample 3 for Analysis

Analysis Results from Sample 3 Area ElementWeight %Atomic % Cr Mn Fe Co Total100.00

Comparison  Two samples of Stainless Steel were obtained from FNAL Cut shop.  One sample was known as SS Type 420 and the other sample was an unidentified SS.

SS Type 420 From FNAL Cut Shop

Analysis Results for SS Type 420 ElementWeight %Atomic % Cr Fe Totals100.00

SS Unknown Sample From Cut Shop

Analysis Results From Unknown ElementWeight %Atomic % Fe100 Note: This sample is not stainless steel.

Additional Test  A strong magnet was used to see if the samples were magnetic.  All samples were magnetic except for the one unknown sample from the cut shop.

Conclusions  Samples from the ultrasonic cleaner are Stainless Steel Series 400. They closely match the known sample Series Type 420.  400 Series SAE Steel Grades are Martensitic and Ferritic steels that contain varying amounts of chromium.  Those grades of SS that do not contain any nickel are magnetic.