Engineering Diffractometer (VULCAN)
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VULCAN Diffractometer at SNS
Click image for a larger version.
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Although the primary use of VULCAN is intended for deformation and residual stress related studies, other uses include
spatial mapping of chemistry, microstructure, and texture.
The desired performance for VULCAN as determined by the user
community is listed below.
- rapid volumetric (3-dimensional) mapping with a sampling
volume of 1 mm3 and a measurement time of minutes
- very high spatial resolution (0.1 mm) in one direction with
a measurement time of minutes
- ~20 well defined reflections for in-situ loading studies
- ability to study kinetic behaviors in sub-second times
- simultaneous characterization capabilities, including dilatometry,
weight, and microstructure
- ancillary equipment such as a furnace and load frame be an
integrated part of the instrument
Instrument Named after the Greek God Vulcan
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Together, these requirements call for a "compound" engineering diffractometer
with a large degree of flexibility for intensity-resolution optimization.
The design philosophy is therefore to deliver a diffractometer with
the highest desirable Q-resolution over a large angular range. For
experiments that do not require such a high resolution, the incident
beam divergence can be relaxed for intensity gain at the sample position. Furnace, load frame, and other auxiliary equipment for in-situ and time-resolved measurements will be an integrated part of the instrument.
Xun-Li
Wang is the SNS instrument
scientist responsible for the
design and construction of
the Engineering Diffractometer.
To find out more about him,
visit his personal website.
The following documents contain more detailed information about the
expected performance and design of the diffractometer:
Science Case For
the Vulcan Diffractometer (PDF 99.1KB)
Summary of the
Breakout Session on Basic Mechanical Properties (PDF 200KB)
Conceptual Design
Report (PDF 201KB)
IDT Meeting Report
(March 7, 2001)
IDT Meeting Report
#1 (Nov. 18-19, 2002), Oak Ridge — T. M. Holden
Instrument
fact sheet (PDF)
The following personnel are currently working on the diffractometer:
George Rennich, Lead Engineer
Harley Skorpenske, Scientific Associate
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