ProtoDUNE Software Trigger Dev Jon Sensenig, David Last, David - - PowerPoint PPT Presentation

ProtoDUNE Software Trigger Dev

Jon Sensenig, David Last, David Rivera, Philip Rodrigues, Lukas Arnold August 26, 2019

Data Flow

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• Schematic of the current data flow

development in ProtoDUNE.

• Hit-sending BR no longer necessary for

Felix BR hit-finding APAs (due to artDAQ changes). Keep them under consideration but running w/o them now.

Candidate BR

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• Data flow in the Candidate BR
• Candidate BR is for a single APA, (in ProtoDUNE, APA5: trigcand500,

APA6: trigcand600)

Window TPSets into 50us windows (for each link) Serialize TPSets from all links into single time-ordered stream 1. Aggregate and channel sort TPs 2. Find adjacency, using adjacency algorithm to generate TCs

MLT BR

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• MLT pushes it’s artDAQ fragment, initiating the readout from the other BRs.
• “To Felix BR” tells the Felix BR to compress the data in anticipation of a data request.
• Algorithms currently looking for muons that cross both APAs.

Time order TCs streams from different APAs

• Aggregate TCs
• Coincidence or Stitch TCs
• Generate Trigger Decision

with coincidence or stitching algorithm Generate artDAQ fragment

• Candidate Algorithm

○ (1) Receive set of time windowed (50µs) and channel sorted TPs ○ (2) Check for adjacency across channels within time window for an APA (allow hit wire gap <= 4) ○ (3) Returns largest adjacency, includes adjacency endpoint coordinates (channel, time) ○ (4) Generate TC if returned adjacency is >=300 (TC coincidence) or >=100 (TC stitching)

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• Module Level Algorithm (super simple)

○ (1) TC time window coincidence ■ Set adjacency threshold large (>300 adjacent wire hits) at candidate level ■ Compare each TC timestamp to the next ■ If timestamp difference of TC A,B < time window and they’re from different APAs → trigger! ■ (i.e. IF TC_A_apanumber != TC_B_apanumber AND time_difference < 50us → trigger)

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Quick First Look

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(Upstream) 5 ← APA → 6 (Middle)

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Some caveats,

• Very loose matching condition for matching TCs between APAs
• High adjacency can be faked by high activity within a time window (see above)
• Still very useful to have for higher trigger rates (a few Hz)

Quick First Look cont.

• Module Level Algorithm (more robust)

○ (1) TC stitching ■ Set adjacency threshold (>100 adjacent wire hits) at candidate level ■ TCs time ordered and aggregated for a drift using a sliding window ■ Calculate the TC slope in time-channel space (m = Δt / Δchannel) ■ Check the slope, time and channel difference between TCs to see if they form a track ■ If the stitched TCs together result in >=350 hits in each APA → trigger

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Quick First Look

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(Upstream) 5 ← APA → 6 (Middle)

Summary & To-Do

• Physics trigger!
• First look, algorithms working as expected, but need to take a detailed look

at more events.

• Take longer run to gather more statistics, very low rate ~9min per trigger.
• Local updates to the algorithm wrapper (ptmp-tcs) need to be packaged and

released for more general use.

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