Log 26

Justin Vandenbroucke

justinv@hep.stanford.edu

Stanford University

This file contains log entries summarizing the results of various small subprojects of SAUND. Each entry begins with a date, a title, and the names of any relevant programs (Labview .vi files or Matlab .m files – if an extension is not given, they are assumed to be .m files).

Note: Higher-resolution versions of the figures are available. If a log has URL dirname/logLL.html, Figure FF of the log should be at URL dirname/FF.jpg.

5/27/04

Trying to get pretty, smooth log-log contours

logGridContours.m

calcFilterValuesRect.m

Figure 1 shows log-log contours (from lattice (rects) 129-134). Figure 2 shows an example of a pressure pulse for one lattice point, and Figure 3 shows a close-up. I believe the roughness in the upper quadrant of Figure 1 is due to the noise in Figures 2 and 3, which is likely due to precision limitations in somewhere in the simulation.

Figure 1

Figure 2

Figure 3

5/28/04

Log-log contours, continued

logGridContours.m

calcFilterValuesRect.m

I created a new lattice (rects 135-140, same coordinates as 129-134), with z discretization of 0.5 m rather than 1 m. This has had no noticeable effect. Smoothing the pressure pulse, however, does. Figure 4 gives the contours from unsmoothed pressure pulses; Figure 5 gives the contours from pressure pulses smoothed by a running average over 10 samples. The location of the contours is shifted slightly and smoothed (10^16 GeV, marked “16”, is changed most).

Figure 4

Figure 5