Difference between revisions of "FDC Backgrounds"
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[[Image:fdc_rate_v_plane.jpg|frame|center|A plot of the rate within 5 cm of the beam axis as a function of the plane number if the FDC. Planes for which N%3 == 2 are anodes, all other planes are cathodes. The notable increase in rate for the downstream chambers could be due to opening of charged particles in the relatively weaker field.]] | [[Image:fdc_rate_v_plane.jpg|frame|center|A plot of the rate within 5 cm of the beam axis as a function of the plane number if the FDC. Planes for which N%3 == 2 are anodes, all other planes are cathodes. The notable increase in rate for the downstream chambers could be due to opening of charged particles in the relatively weaker field.]] | ||
− | [[Image: | + | [[Image:fdc_anenergy.jpg|frame|center|A double-log plot of the energy of all hits on anode wires in the FDC. The spectrum cuts off at 1 keV due to the GEANT threshold.]] |
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+ | [[Image:fdc_anenergy_int.jpg|frame|center|The integral of the plot above.]] | ||
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+ | [[Image:fdc_caenergy.jpg|frame|center|A double-log plot of the energy of all hits on cathode strips in the FDC. ''This looks buggy or else the units aren't quite as advertised.'']] | ||
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+ | [[Image:fdc_caenergy_int.jpg|frame|center|The integral of the plot above.]] |
Revision as of 14:47, 16 January 2007
Back to Background Rate Studies
Detector Configuration
- Double-Hit Resolution: 250 ns
- Threshold: 1 keV
- Strip Threshold: 5 mV
- Maximum Number of Hits: 100
- Dead Zone Radius: 3.5 cm
Items for Discussion
- These rates seem incredibly high.
- Is the maximum number of hits coded into the simulation sufficient for the FDC? If it is applied at the event level, 100 hits is probably not enough.
- How relevant is the increased background as a function of downstream position of the package?
- Does this need to be considered when optimizing package placement?
- Do/Should the dead regions for each package vary in size depending on downstream location?
Plots
Plots below are out of date!