Difference between revisions of "CHESS X-ray measurements 11/2006"

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In November, 2006 we had a one week beam time at CHESS in Cornell University. We measured rocking curves for several diamond crystals there. Some interesting results are shown below.  
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In November, 2006 we had a one week beam time at CHESS in Cornell University. Participating in this run were: CHESS staff scientist Ken Finkelstein and GlueX collaborators Guangliang Yang, Richard Jones, and Franz Klein.  We measured rocking curves for several diamond crystals there. Franz brought with him the target ladder from Hall B, so we had quite a rich variety of samples to examine.
  
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* [[Results for the 20 micron diamond]]
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* HallB-G50 : type IA natural diamond, said to be 53 microns thick, mounted on the Hall B target ladder.  Experimenters from g8 call this diamond "good", hence the name G50.
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* [[Discussion about the X-ray beam divergence]]
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* HallB-B50 : type IIA natural diamond, said to be 40 microns thick, mounted on the Hall B target ladder.  Experimenters from g8 call this diamond "bad", hence the name B50.
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* [[How the crystal curvature affects the rocking curve width]]
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* HallB-20 : type IB synthetic (HPHT) diamond, said to be 18 microns thick, mounted on the Hall B target ladder.
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* twin-50 : type IA natural diamond, said to be 50 microns thick, thought to be a twin crystal, part of the Glasgow collection.
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* badboy-50 : type IIA natural diamond, said to be 50 microns thick, thought to have a large rocking curve width, part of the Glasgow collection.
  
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One of the challenges we faced during the 2006 feasibility measurements at CHESS was how to sufficiently collimate the beam to resolve the rocking curve structure of diamond on the scale of its natural Darwin width.  The following studies were carried out to understand why this was difficult to do given the standard C1 beam line configuration, and how it might be improved for diamond diffraction measurements.
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All data were archived at UConn.  Some interesting results for the 20 micron crystal are shown below.  
  
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* [[Basic formalism for X-ray monochromator resolution]]
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* [[Results for the 20 micron diamond]]
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* [[Monte Carlo simulation of the CHESS C1 beamline]]
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* [[Design of an asymmetric monochromator]]
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The following is a record of the technical notes describing the results of the X-ray measurements of Hall B diamond radiators in the CHESS C1 X-ray beam line in November, 2006.
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#[http://zeus.phys.uconn.edu/halld/diamonds/chess-11-2006/gluex-doc-844.pdf  X-ray monochromator technical note]
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Latest revision as of 12:11, 29 November 2011

In November, 2006 we had a one week beam time at CHESS in Cornell University. Participating in this run were: CHESS staff scientist Ken Finkelstein and GlueX collaborators Guangliang Yang, Richard Jones, and Franz Klein. We measured rocking curves for several diamond crystals there. Franz brought with him the target ladder from Hall B, so we had quite a rich variety of samples to examine.

  • HallB-G50 : type IA natural diamond, said to be 53 microns thick, mounted on the Hall B target ladder. Experimenters from g8 call this diamond "good", hence the name G50.
  • HallB-B50 : type IIA natural diamond, said to be 40 microns thick, mounted on the Hall B target ladder. Experimenters from g8 call this diamond "bad", hence the name B50.
  • HallB-20 : type IB synthetic (HPHT) diamond, said to be 18 microns thick, mounted on the Hall B target ladder.
  • twin-50 : type IA natural diamond, said to be 50 microns thick, thought to be a twin crystal, part of the Glasgow collection.
  • badboy-50 : type IIA natural diamond, said to be 50 microns thick, thought to have a large rocking curve width, part of the Glasgow collection.

All data were archived at UConn. Some interesting results for the 20 micron crystal are shown below.

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