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TOF Detector Pretrigger Analysis: Calibration, Coincidence Rates, and Dark Rate Estimation

The Time-of-Flight (TOF) detector provides essential trigger bits through detailed calibration and alignment across 18 azimuthal sectors, each containing 192 bits. With a maximum segmentation of 6 cells per quadrant, the analysis explores the implications of dark rates, cosmic ray triggers, and their coincidences. The study highlights total dark rates ranging from 18.4 kHz to 260 Hz in various configurations, emphasizing the challenges in maximizing segmentation. Issues regarding DAQ connection for trigger systems are also discussed.

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TOF Detector Pretrigger Analysis: Calibration, Coincidence Rates, and Dark Rate Estimation

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  1. TOF-TRD pretrigger • TOF detector can provide trigger bits • Calibration/Alignment Azimuthal sector: 4 TOF quadrants LTM LTM Max segmentation: 4x12 = 48/quadrant 4x48 = 192/azim. sector Total 18x192 = 3456 bits Dark rate each bit 240 Hz 4x 2x 12x 3x • Max segmentation difficult to implement, feasible 2x3=6 cells/quadrant • Total 6x4x18 = 432 bits • Each cell represents TOF area 1.2x0.35 m2 • dark rate of each cell 8x240 Hz ~ 2kHz

  2. Cosmic trigger • Segmentation A: 2 in z, 36 in azimuth (1 bit/quadrant) • Segmentation B: 6 in z, 72 in azimuth (6 bits/quadrant) • Cosmic trigger coincidence 2 bits • Cosmic trigger coincidence 2 bits opposite in z and azimuth  Reverse Single Track (RST) • Dark rate A: dark rate/quadrant: 48x240 Hz ~ 12 kHz • Acc. rate/quadrant = 2tR1R2 = 7.2 Hz (t=25 ns) • any pairs of quadrants (2556)  total dark rate 18.4 kHz • pairs of back to back quadrants (36)  total dark rate 260 Hz • Dark rate B: dark rate per cell ~ 2 kHz • Acc. rate = 2tR1R2 = 0.2 Hz • any pairs of cells (93096)  total dark rate 18.4 kHz • pairs back to back cells (216)  total dark rate 44 Hz (rate A/6)

  3. Cosmic trigger rates • Cosmic ray flux 100 m-2s-1sr-1 ( at q=0o,q= zenith angle) • Angular distribution ~ cos2(q) • Cosmic rays straight line trajectory • Trigger: • any two bits • two bits RST • Of interest for scenarios A,B : • rate • distance to interaction region x rdist . z . zdist y

  4. Cosmic ray trigger Coincidence any two bits: rdist-zdist distribution Segmentation A: Cosmic rate 8 kHz |zdist| < 3.5 m rdist < 4 m Segmentation B: Cosmic rate 8 kHz |zdist| < 3.5m rdist < 4 m

  5. Cosmic ray trigger Coincidence two bits RST: rdist-zdist distribution Segmentation A: Cosmic rate 106 Hz |zdist| < 1.5 m rdist < 0.3 m dark rate 260 Hz Segmentation B: Cosmic rate 20 Hz |zdist| < 0.5 m rdist < 0.15 m dark rate 44 Hz

  6. TOF pretrigger concept Open issue: DAQ connection ?

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