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A Tracking Trigger for Lower Energy Threshold

A Tracking Trigger for Lower Energy Threshold. Hank Crawford Carl Pennypacker UCB. To explore the GZK region from its onset and tie more clearly to ground based data. The idea is to maximize use of time and spatial coherence in the shower signal

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A Tracking Trigger for Lower Energy Threshold

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  1. A Tracking Trigger for Lower Energy Threshold Hank Crawford Carl Pennypacker UCB To explore the GZK region from its onset and tie more clearly to ground based data crawford@lbl.gov

  2. The idea is to maximize use of time and spatial coherence in the shower signal Use pixel-level tracks with pixel-threshold=0 Consider EUSO as a digital video camera taking one picture or frame each GTU A shower then leads to a track in frame-time or x,y,GTU space Noise leads to tracks also, but these have many gaps compared to “real” tracks crawford@lbl.gov

  3. Offline we expect to have the hit-count for each pixel in the central macrocell (and in each surrounding macrocell) Our signal to noise will be very large because we can demand that the signal behave correctly How many frames would we have to look at to form an efficient online trigger? crawford@lbl.gov

  4. The signal to noise depends critically on the spot size and the choice of GTU The noise is expected to be ~0.1-0.2 pe/pixel/microsec The signal for 1019eV shower is ~0.8 pe/microsec IF the spot size is < 1 pixel and the GTU is 1 microsec then 15 frames is sufficient to form an efficient trigger that has a very low false rate If the spot is > 1 pixel, then we need to sum over nearest neighbors. The noise grows linearly with the number of pixels in the sum while the signal stays the same size. crawford@lbl.gov

  5. We will model the power consumption required for a tracking trigger based on each microcell. (16 x 16 (frame) x 16 (GTU)) Our goal is to use < 20mW per microcell. If we can make a plausible argument for this low power based on simulations in CMOS FPGAs, Marco has agreed to look seriously at designing this into the DFEE ASIC It may also be that we could dedicate a portion of the focal plane to a higher-power tracking trigger while maintaining the current macrocell-based triggers for the vast majority of the focal plane (see my FARO presentation on “sweet spot” idea) crawford@lbl.gov

  6. A Tracking trigger based on pixel-level tracks in microcells can be a complement to the macrocell triggers to give us a lower energy threshold capability This would allow us to explore the physics of the GZK turn on region Tracking is best if based on single pixels (needs small spot size and short GTU) but can also be based on groups of pixels crawford@lbl.gov

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