ProtoDUNE Trigger Proposal Jonathon Sensenig Josh Klein, Nuno Barros, David Rivera 0
Trigger Generation and Distribution • Triggers come primarily from 3 sub-systems SubSystem Triggers Trigger • Beam Instrumentation (BI) Monitor CRT Data - CRT • Cosmic Ray Tagger (CRT) Streams n - PDS to artDAQ Channel PDS • Trigger Photon Detection System (PDS) - Beam Masks Masks Global and Trigger Instr. n • Trigger calculation divided up likewise. Prescale Beam Instr. • Subsystem triggers can be masked in/out and pre-scaled. n • Final trigger (global trigger) is some combination of the n TimeStamp (or a “masked in” subset) sub-system triggers. • All triggers (sub-system and global) timestamped and recorded. Trigger • Trigger distribution and vetoing handled by the timing EXPERIMENT Timing System system 1
Beam Instrumentation DAQ § (x1) Beam trigger (min. bias, indicating the presence of Computers TOF 1 a beam particle entering the TPC) optical fiber chain § (x2) 1 Signal from each of the threshold Cherenkov detectors § (x2) 1 Signal from each of the ToF measurements § (x3) 1 Signal from each of the 4 tracking Sci-Fi TOF 2 detectors § Possible future additions: Signals from a ToF trigger (e, ! , Κ ,p) § (x4) Info thanks to Karol • *Beam Instrumentation setup subject to change 2
Trigger: Beam Particle • Example of a possible beam trigger where there is a “good particle” in PDS Channels the beamline. CRT Trigger • Assumes the PDS will not be PDS Trigger overwhelmed with light from Beam Trigger SubSystem Triggers cosmics. True? Will need CRT - CRT Trigger simulation. - PDS Channel Masks Global PDS - Beam and Masks Trigger Prescale Instr. Beam Instr. Beam Spill SciFi BI Channels Ckov 1 TOF2 3
CRT Setup • 2 upstream and 1 (but probably 2) downstream CRT panels. • X and Y planes each composed of 2 parallel but shifted modules • Perpendicular X and Y planes to give 25mm xy granularity • X-Y planes AND’ed by the CRT electronics. • CTB receives 1 input per 4 modules (X-Y plane pair) which is 8 inputs per panel. *CRT arrangement from TDR, subject to change 4
Trigger: Cosmic Tagging Calibration • Example of a cosmic trigger where there is a through-going muon. A hit on the front panel followed by light detected by Beam Trigger the PDS and a hit on the back panel. • This is a bit oversimplified and the logic PDS Trigger CRT Trigger use is non-trivial so will have to SubSystem investigate a bit more. Triggers CRT • Good for SCE calibration and electron - CRT - PDS Channel Trigger Global PDS - Beam Mask Mask Trigger lifetime. Instr. Beam Instr. Front Panel 1 Front Panel 2 Signals from CRT Channels AND’ed CRT Layers Back Panel 5
Trigger: Stopping Muons with Michel electrons • Example of a through-going muon and Michel electron. Beam Trigger • Hit on the front panel and no hit on PDS Trigger back panel, i.e., the muon stops in CRT Trigger cryostat. SubSystem Triggers • Again, this is a bit oversimplified and CRT - CRT - PDS Channel Trigger Global the logic use is non-trivial so will PDS - Beam Mask Mask Trigger Instr. Beam have to investigate a bit more. Instr. Front Panel 1 Front Panel 2 Signals from CRT Channels AND’ed CRT Layers Back Panel 6
Summary and Direction • Quite a bit of flexibility in trigger construction, but will need input from physics groups and administration. • Tension between what we want to do from a physics perspective and what we can do with limited beam time. • Trigger proposals will need simulation to verify, discuss with Robert and Dorota on how to accomplish this. • Trigger proposal document being drafted. • Work under progress… feedback welcomed sooner rather than later. 7
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