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TOF-TRD pretrigger

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.

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TOF-TRD pretrigger

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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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