Summary of Instrument Usage (1999-2003): Overall, we averaged 10.4 beam hours per day (365 day/year basis).  Note that extended maintenance periods occured in 2000 and 2003. External NSF-sponsored users accounted for 6617 hours of analysis time.  This represents about 35% of the total usage over this interval or roughly 110 days per year when expressed in terms of 12 hour days. Internal ion microprobe group members accounted for 9280 hours (49%). Of this, 5583 hours (29%) were devoted to NSF-sponsored projects.  Therefore, NSF’s share of instrument time has been 12200 hours (64%) over the last five years. Total non-NSF usage was 5067 hours or 27% of the total instrument time.  This work was funded by NASA, DoE, NIST, NIH, PRF, and other agencies. Testing and development of new and existing instrumental capabilities and analytical methods was 1791 hours or 9% of the total instrument time.  This category does not include down time required for repairs or routine maintenance which is also an important part of maintaining a facility.

Facility Usage 1999 2000 2001 2002 2003 Total Beam hours 4025 3653 4178 4100 3102 19058 %efficiency 45.9 41.7 47.7 46.8 35.4 43.5 Beam Hours/day 11.0 10.0 11.4 11.2 8.5 10.4 Beam Time (%) Ion Probe Group 43.3 43.2 61.3 42.6 43.4 48.7 External (NSF) 40.6 44.0 20.4 40.2 43.9 34.7 External (Other) 8.7 3.4 5.0 5.5 3.4 7.2 Testing & Development 6.4 9.4 13.2 11.8 9.3 9.4