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EMCal Jet Trigger Status

tyrell avatar
tyrell
18 diapositives · 317 Views · Aug 21, 2014

The EMCal jet trigger system seeks to improve jet reconstruction and analysis performance in high-energy particle collisions at the LHC. By comparing central Pb+Pb collisions to various reference systems such as p+p and p+A, the study investigates the effects of system size and shape on jet yields. Significantly, the use of the EMCal is noted to enable jet quenching measurements beyond 100 GeV. The system's architecture is tailored for optimal data acquisition and management to boost trigger efficiency and discover insights into cold nuclear matter effects.

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EMCal Jet Trigger Status
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  1. EMCal Jet Trigger Status Hans Muller/CERN Peter Jacobs/LBNL

  2. Jet Trigger enhancement Jet trigger • Compare central Pb+Pb to reference measurements • Pb+Pb peripheral: vary system size and shape • p+A: cold nuclear matter effects • p+p (14 TeV): no nuclear effects, but different energy • p+p (5.5 TeV): ideal reference, but limited statistics All reference systems are required for a complete systematic study Includes acceptance, efficiency, dead time, energy resolution

  3. Jet trigger in p+p Trigger efficiency Jet Patch 0.25x0.25 Jet energy (GeV) • p+p in ALICE: L~ 5x1030/cm2/s ~ 200 kHz • ALICE DAQ limits recording to 200 Hz •  L1 rejection ~2000-4000 for p+p Chris Anson Sharp threshold at required L1 rejection

  4. Jet yields: one LHC year Jet yield in 20 GeV bin Large gains due to jet trigger Large variation in statistical reach for different reference systems

  5. Jet quenching measurement:p+Pb reference • With EMCal: jet trigger+ improved jet reconstruction provides • much greater ET reach • systematically improved response

  6. Jet quenching measurement:Peripheral Pb+Pb reference Without EMCal, significant quenching measurements beyond ~100 GeV are not possible

  7. PHOS / EMCal readout and trigger Charge-Sensitive-Preamplifier ( CSP ) Shaper CERN/Wuhan Altro-chips (10 bit ADC) TPC-like readout backend DAQ and Trigger DATE Monitoring 1 ò I dt = gauss V semi sampling EMcal 10…20 MHz PHOS 2 .. 10 MHz 2 digitization ranges - - HLT step C PHOS t =15 ns r GDC t EMCal tpeak= 200ns RC discharge =100us EMCal L0 L2 DDL (data) PHOS tpeak= 2000ns R p 1V/pC A.) RC highpass B.) dual integrator 100 us GTL LTC V0 A A = 0.015 -15 GeV = 0.005 -5 GeV A1 1 1 ADC PHS-Shaper fc =1.6 kHz A A = 0.25..-250 GeV = 0.08..-80 GeV MEB pipeline TTC (L2) 2 2 C EC-Shaper fc =1.6 MHz GTL Readout Bus f 20dB 2 * 20db 10b High gain 3dB/oct 3dB/oct 3dB/oct L0,L1 Anti-alias A2 CSP Pole –Zero 100 us PWO (PHOS) Tower(EMCal) Ethernet DCS glue dcs siu branchA APD APD Low gain R R - - . . bias PHOS 40 / EMCal 33 Trigger Region Units RCU fibers Xtals 210…400V differtl. cables PHOS M=50 EMCal M=30 TRU A->D individual APD L0 TMU HV bias +HV 400V to CTP TRU JET control L1 2 *2 analog Sums PHOS 112 EMCal 119inputs 3 32 channel APD bias control PHOS+EMCal 3.1-Gbit/s opt. links TMU Level-1 EMCal only • L1 (6 ms): 2x2 tower analog sum  TRU  4x4 tower peak finder • EMCal: 12 FEE/GTL bus  12*32=384 towers/TRU • configure as 16*24 towers Dh x Df~0.22 x 0.34

  8. Cartoon of jet patch trigger Summary TRU Low-latency serial pass-through Low-latency serial pass-through Low-latency serial pass-through …………… TRU ~400 towers TRU ~400 towers TRU ~400 towers TRU ~400 towers TRU ~400 towers TRU ~400 towers Jet patch trigger Max aggregate input bandwidth= 3 Gbit/s latency 1-2 ms < 100 Mbit/s ~100 bits/evt 13K towers ~ 30 TRUs

  9. First TRU card proto ( PHOS) 3 x 3.1 Gbit optical I/O links, 1 V0 optical input EMCal I/O Common PHOS/EMCal 112 ADC’s 12 bit @40 MHz Analog inputs from FEE card RCU bus USB diagn.

  10. L0 timing: simplest algorithm OK Pack and ship every bunch crossing (75 bits/TRU?):

  11. L1 timing: simplest algorithm Just the data transfer takes too long! Simplest approach: no bunch filter at L0 Lumi loss due to pileup  need local L0?  Need to filter at TRU1 based on global L0

  12. Bunch Filter 0.15 Gbit/s 0.15 Gbit/s 0.15 Gbit/s 34 Gbit/s 34 Gbit/s 34 Gbit/s • Initially planned major design effort not required ! -> TMU / SMU cards from TRD can do the job <- • Major step forward for building JET proto within 1 year 9x Level-0 @ 1.2 us

  13. TMU card (Alice TRD detector , KIP Heidelberg )

  14. Bunch filter implementation with TMU and SMU 1 optical Output 3.1 Gbit/s Common LVDS I/O bus Compact PCI bus 64 bit SMU TTC TMU Level-0 trigger: from TTC @ 1200 ns after Bx L0 FiFo Transfer selection: L0 at 1.2 us, max 200 kHz Xilinx Virtex-IV FPGA Input: 11 x 3.1Gbit/s One SMU /DCS card for n TMU cards ( assume n=3) 11 optical inputs ( 1/3rd of TRU) pre-selected bunch packets from TRU

  15. SMU concentrator cards with ALICE DCS ethernet and TTC link ( LHC clock, bunch count, L0,L1)

  16. TMU/SMU crate for EMCal JET SYS empty TMU TMU TMU TMU TMU TMU TMU TMU TMU TMU SMU SMU DCS TTC DCS TTC Need space for 2 Compact PCI crates TRU Jet Trigger out TTC Ethernet 1 Gbit fiber output LVDS communication bus Water-cooled PS Rocket I/O fiber connections SYS empty 99 Gbit fiber inputs from 33 TRU -> 9 TMU

  17. EMCal system overview dcs dcs TMU TMU TMU TMU TMU ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC Time after Bx Comment BW 6000 ns Level-1 yes/No Output L1 40 MHz NRZ V0(10 Multiplicity bits) Patch search of JET over V0-defined threshold TRU 1 GTL branch Level-1-JET 2000 ns Input Max: 1.35 Gbit/s CTP 1 optical R/IO link ( 2 spares) 10 x TMU+ 3 x dcs +1 TRU L0-triggered forwarding of selected packets 1750 ns 3 3 3 x 3 optical R/IO links 1 TMU Output Max: 0.15 Gbit/s dcs 1500 ns L0-packets->out L0 <= 200 kHz TTC LTC 1200 ns (lev-0) level-0 selection 1050 ns DCS, Ethernet Packet synch -> FiFo 1 TMU Input 11 x 3.1 Gbit/s Level-0 3 x Level-1 3 x 11 3 x 11 3 x 11 33 TRU 33 Xmit 10-bunch Packets750bit/250 ns 1 link=32 TRU channels 3 x 3 x 11 optical R/IO links 3.1 Gbit/s digital Bunch sync / reset Trigger-OR 800 ns Level-0 (600 ns) 1 TRU output Max: 9.3 Gbit/s 3 TRU Bunch Thresh: max 2 of 10 TRU 320 ns 3x 3 x Level-1 155 ns 1 TRU Input: 96 x 0.48Gbit/s = 46 Gbit/s analogue->digital 12 bit 12 DAQ +HLT 12 1 TRU input channel = analogue OR of 2x2 towers 22 x RCU 44 branches 22 DDL RCU RCU 12 x 8 Analogue Fast OR (100 ns) 150 ns 9 FEE/GTL branch analogue 396 x FEE 100 ns quad shaper FEE FEE FEE Ne ->CSP Steo Voltage 32 36 FEE/SM 4 g -> Ne conversion 11 Super-Modules 1 Super-Module = 12 x 24 Modules 12 g 24 12672 x APD / CSP / Towers Particle TOF collision o

  18. Jet trigger summary • Estimated cost: ~ SFr 100K-150K • Relaxed schedule relative to other project issues: • jet trigger effective only for ~full device and high lumi • current plans: commission late ’08 • Technical solutions may be in hand now (thanks to TRD) • Participating institutions: CERN (H. Muller), LBNL, Grenoble, Nantes, ORNL,…