The detector read-out in ALICE during Run 3 and 4
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1 The detector read-out in ALICE during Run 3 and 4 CHEP 2016 Conference, San Francisco, October 8-14, 2016 Filippo Costa ALICE O2/CRU for the ALICE collaboration
2 OUTLINE 1 st PART: INTRODUCTION TO ALICE UPGRADE Motivation. Requirements. 2 nd PART : THE DETECTOR READOUT Main difference from the current readout schema. System operation in triggered mode. System operation in continuous mode. 3 rd PART : RESULT and CURRENT STATUS 2
3 INTRODUCTION TO ALICE RUN3 3
4 GOAL: ALICE Upgrade Strategy High precision measurements of rare probes at low p T which cannot be selected with a trigger. Target a recorded Pb-Pb luminosity > 10 nb -1 => 9x10 10 events to gain a factor 100 in statistics over the Run1 + Run2 programme. Significant improvements of vertexing and tracking capabilities DETECTOR: Read-out all Pb-Pb interactions at a maximum rate of 50kHz (i.e. L = 6x10 27 cm -1 s -1 ) upon a minimum bias trigger Read-out all pp and p-pb interaction at a maximum rate of 200 khz. Perform online data reduction based on reconstruction of cluster and tracks Improve vertexing and tracking at low p T => New Inner Tracking System (ITS) TPC continuous readout to keep up with 50 khz interaction rate, to deal with event pile-up and avoid trigger generated dead time. 4
5 ALICE UPGRADE O 2 computing farm: - ~ 100 k CPU cores - ~ 5000 GPUs and ~500 FPGAs - ~ 60 PB of storage 3.6 TByte/s into PC farm O 2 (Online Offline) System Partial calibration and reconstruction online, replacing the original raw data with compressed data Acq rate: Pb-Pb 50 khz pp and p-pb up to 200 khz STORAGE 90 GB/s Complete change in detector readout continuous triggered New DAQ - HLT - OFFLINE systems.
6 Main differences between RUN2 & RUN3 6
7 RUN2 TRIGGER SYSTEM - Trigger connected to the - Triggered readout mode - 1 readout link, DDL (Detector Data Link) CRORC DAQ DATA CRORC RORC 7
8 RUN3 - Trigger connected to the and CRU - Triggered and Continuous readout mode - 2 readout link, DDL and GBT TRIGGER SYSTEM Detector that receives trigger and clock from CRU TPC MCH MID MFT TOF FIT ZDC CRU CRU DAQ CRU: Common Readout Unit CRORC DATA 8
9 The detector readout during RUN3 9
10 TRIGGERED MODE BUSY TRIGGER SYSTEM Upon reception of a trigger signal, each detectors respond and send the corresponding data. BUSY DATA CRU CRU Readout card DAQ 10
11 CONTINUOS MODE DATA is sent regardless the triggers TRIGGER SYSTEM CRU O2 DATA Data are not delimited by physics trigger, but are composed by several data streams CRU CRU 11
12 Heart Beat (HB) issued in continuous & triggered modes to all detectors Continuous read-out HBF and TF rates programmable Typical values: - HB: 1 per orbit, 89.4 µs: ~10 khz - TF: 1 every ~20 ms: ~50 Hz - 1 TF = ~256 HBF (Front-end &) CRU Heart Beat Frames (HBF): data stream delimited by two HBs Time 12
13 Heart Beat (HB) issued in continuous & triggered modes to all detectors Triggered read-out Physics trigger can be sent to upgraded detectors will be sent to non-upgraded detectors HBF and TF rates programmable Typical values: - HB: 1 per orbit, 89.4 µs: ~10 khz - TF: 1 every ~20 ms: ~50 Hz - 1 TF = ~256 HBF (Front-end &) CRU Heart Beat Frames (HBF): data stream delimited by two HBs Trigger data fragments Time 13
14 Heart Beat (HB) issued in continuous & triggered modes to all detectors Triggered read-out Physics trigger can be sent to upgraded detectors will be sent to non-upgraded detectors HBF and TF rates programmable Typical values: - HB: 1 per orbit, 89.4 µs: ~10 khz - TF: 1 every ~20 ms: ~50 Hz - 1 TF = ~256 HBF (Front-end &) CRU Time Heart Beat Frames (HBF): data stream delimited by two HBs Trigger data fragments FLP Sub-Time Frame (STF) in FLP 0: grouping of (~256) consecutive HBFs from one FLP FLP 1 FLP n EPN Time Frame (TF): grouping of all STFs from all FLPs for the same time period from triggered or continuously read out detectors 14
15 Time Frames/Heart Beat Frames HB header Payload (if no hits empty) HB trailer HB header Deleted HBF (no or partial data) HB trailer FLP.. First Level Processor EPN.. Event Processing Node STF.. Sub Time Frame TF.. Time Frame HB.. Heart Beat Trigger HBF.. Heart Beat Frame HB0 HB1 HB2 HB3 HB4 HB5 HB6 HB7 HB8 HB9.. HB255 HB0 HB1 HB2 HB3 HB4 HB5 HB6 HB7 HB8 HB9.. HB255 FLPn FLP2 FLP1 FLP0 EPN EPN 15
16 What happens if CRU buffers get full? HB header Payload (if no hits empty) HB trailer HB header No or partial HBF data HB trailer FLP.. First Level Processor EPN.. Event Processing Node STF.. Sub Time Frame TF.. Time Frame HB.. Heart Beat Trigger HBF.. Heart Beat Frame HB0 HB1 HB2 HB3 HB4 HB5 HB6 HB7 HB8 HB9.. HB255HB0 HB1 HB2 HB3 HB4 HB5 HB6 HB7 HB8 HB9.. HB255 FLPn FLP2 FLP1 FLP0 EPN EPN The main goal is to collect one complete TF or at least one or more HBFs 16
17 What happens if CRU buffers get full? HB header Payload (if no hits empty) HB trailer HB header No or partial HBF data HB trailer FLP.. First Level Processor EPN.. Event Processing Node STF.. Sub Time Frame TF.. Time Frame HB.. Heart Beat Trigger HBF.. Heart Beat Frame HB0 HB1 HB2 HB3 HB4 HB5 HB6 HB7 HB8 HB9.. HB255HB0 HB1 HB2 HB3 HB4 HB5 HB6 HB7 HB8 HB9.. HB255 FLPn FLP2 FLP1 FLP0 EPN EPN 17
18 What happens if CRU buffers get full? CRU will autonomously abort the read-out of corresponding HBF Delete HBF data from buffer Send negative HB acknowledge to CTP Send negative acknowledge to FLP in the HB header/trailer pair Read-out continues Counter and state machine stay consistent In nominal conditions occurrence assumed to be negligible 18
19 What happens if CRU buffers get full? CTP HB Map HB Map HB Map CTP FLP 1 HB trigger/message 3b HBF/trigger acknowledge/ message Readout Links CRU 2 HBF/Trigger Transmitted? 3a HBF Header (Payload) Trailer FLP 4 Delete HBF from buffer 5 Delete HBF from memory 19
20 Current status of the development & RESULTS 20
21 Current status Several detectors have a readout chain using GBT to test their prototype. The readout modes are triggered and continuous Detector number of GBT readout mode TOF 2 triggered ITS 1 triggered FIT 1 triggered MCH 1 triggered MID 1 continuous TPC 2 continuous 21
22 TOF setup 2 GBT links connected to the readout system # 1 # khz DAQ 700 MB/s 22
23 TPC setup Readout system used to collect data in continuous mode and to configure the electronics using the GBT protocol 23
24 QUESTIONS? THANK YOU 24
25 Schedule High-Level Design R&D Design R&D Demonstrators Detailed design R&D Prototyping Development Detailed design R&D Prototyping Development Development Products selection Project organization TDR Products selection Products selection Prototypes Products selection Prototypes Final components Deployment Commissioning Final components Deployment Commissioning Production 25
26 Busy, throttle schema 26
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