CDC Backgrounds

Back to Background Rate Studies

Detector Configuration

• Double-Hit Resolution: 250 ns
• Threshold: 1 keV
• Maximum Number of Hits (per Event): 100

Items for Discussion

• Should stereo geometry be so noticeable in background rate? If the noise source is far upstream, then stereo straws will present a large cross section to the noise source than axial straws.

This question is under study, results forthcoming. [rtj]

• There seems to be something wrong with CDC layer 18. Is this just a bug in the geometry or something else?

This was a bug in the hdds geometry, due to a typographical error in the xml source document. The fix has been checked into the central repository. [rtj]

Plots

The average background rate per straw in Hz as a function of ring number in the CDC.

A double-log plot of the energy of all hits in the CDC. The spectrum cuts off at 1 keV due to the GEANT threshold.

The integral of the energy spectrum above. Plotted on the y axis is the fraction of the spectrum above the corresponding x axis cutoff.