Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air Force Research Laboratory (AFMC) AFRL/PRS SPONSOR/MONITOR'S Pollux Drive NUMBER(S)Edwards AFB CA 93524-7048 AFRL-PR-ED-TP-2007-381 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited (PA #07318A). ABSTRACTThis work attempts to determine angular dependence curves for sputter rates of a material based on a single experimental measurement. An aluminum cylinder was exposed to a BHT-200 plume, and the resulting erosion profile was measured. This profile was fed into an optimizer, which calculated the angular dependence curve to match the given erosion profile. The calculated profile matched well with the experimental profile; however, neither matched well with previously published results. The likely cause of this discrepancy was the non-uniformity of the ion source used. As a further validation of the optimization routine, the angular dependence curve was input to the COLISEUM plasma modeling code, which generated the same erosion profile as the experimental data. Abstract: This work attempts to determine angular dependence curves for sputter rates of a material based on a single experimental measurement. An aluminum cylinder was exposed to a BHT-200 plume and the resulting erosion profile was measured. This profile was fed into an optimizer, which calculated the angular dependence curve to match the given erosion profile. The calculated profile matched well with the experimental profile, however neither matched well will previously published results. The likely cause of this discrepancy was the non-uniformity of the ion source used. As a further validation of the optimization routine, the angular dependence curve was input to the Coliseum plasma modeling code, which generated the same erosion profile as the experimental data.
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