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Laser Subdivision of the Genesis Concentrator Target Sample 60000The Genesis Allocation Committee received a request for ~ 1 square centimeter of the diamond-like-carbon (DLC) concentrator target for the analysis of solar wind nitrogen isotopes. The target consists of a single crystal float zone (FZ) silicon substrate having a thickness on the order of 550 micrometers with a 1.5-3.0 micrometer-thick coating of DLC on the exposed surface. The solar wind is implanted shallowly in the front side DLC. The original target was a circular quadrant with a radius of 3.1 cm; however, the piece did not survive intact when the spacecraft suffered an anomalous landing upon returning to Earth on September 8, 2004. An estimated 75% of the DLC target was recovered in at least 18 fragments. The largest fragment, Genesis sample 60000, has been designated for this allocation and is the first sample to be subdivided using our laser scribing system Laser subdivision has associated risks including thermal diffusion of the implant if heating occurs and unintended breakage during cleavage. A careful detailed study and considerable subdividing practice using non-flight FZ diamond on silicon, DOS, wafers has considerably reduced the risk of unplanned breakage during the cleaving process. In addition, backside scribing reduces the risk of possible thermal excursions affecting the implanted solar wind, implanted shallowly in the front side DLC.
Document ID
20130011251
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Lauer, Howard V., Jr. (Barrios Technology, Inc. Houston, TX, United States)
Burkett, P. J. (Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Rodriquez, M. C. (GeoControl Systems, Inc. Houston, TX, United States)
Nakamura-Messenger, K. (Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Clemett, S. J. (Engineering Research and Consulting, Inc. Houston, TX, United States)
Gonzales, C. P. (Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Allton, J. H. (NASA Johnson Space Center Houston, TX, United States)
McNamara, K. M. (NASA Johnson Space Center Houston, TX, United States)
See, T. H. (Barrios Technology, Inc. Houston, TX, United States)
Date Acquired
August 27, 2013
Publication Date
January 1, 2013
Subject Category
Lasers And Masers
Report/Patent Number
JSC-CN-27946
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 18, 2013
End Date: March 22, 2013
Distribution Limits
Public
Copyright
Public Use Permitted.

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