User name J. Singh
Log entry time 04:31:10 on May26,2004
Entry number 123099
keyword=energy spread, part 1here are somes screens i grabeed at about 0416 within a minute of each other.
fig 1 is the OTR. the x width (rms) has been 0.280 ± 0.010 mm. the runplan spec is ≤ 0.240 mm. in theory, the width in the OTR can be a function of both the intrinsic beam size and the energy spread. therefore it is not obvious if we are in or out of spec.
fig 2 is the SLI. Rob tells me that the spec for this exp is ≤ 60 ppm (6x10^-5). the SLI measures this by taking the ratio of the "wiggles" to the width of the overall "bump." unfortunately, the energy spread numbers are only good when fit is "wiggilicious" (i.e. the "wiggles" in the fit match the "wiggles" in the data). i believe the screenshot in fig 2 shows an instance when the fit is "wiggilicious." here the model data energy spread was about 60 ± 4 ppm (6.0 ± 0.4 x10^-5). this seems to indicate that the energy spread is right at the limit of the spec.
FIGURE 1
FIGURE 2
