Detector parameters and modelling M. Abolins, J.C. Vermeulen Input for modelling: Number of ROLs and ROL mapping onto detector (ROL mapping, together with trigger menu, sequential processing strategy and associated reduction factors, determines LVL2 RoI request rate) Fragment sizes per ROL Detector parameters and modelling, TDAQ week December 2002

Current knowledge of # of ROLs (from Annecy ROD workshop) # of ROLs Detector # of ROLs Frag. size (avg., 10^34) Pixel 120->192? 1300 SCT 92 1600 TRT 256 525 Tilecal 64 1100 LAr 768 1400 MDT 192 800 RPC 32 1000 TGC 16 200 CSC LVL1 55 1500 (not for all) not used by LVL2 Detector parameters and modelling, TDAQ week December 2002

+16 PP ROLs + 1 Central muon trigger ROD = 55 RODs Detector parameters and modelling, TDAQ week December 2002

ROL mapping onto detector is important for subdetectors that provide data to LVL2. No indications, so far, of important changes in the mapping. For the muon barrel trigger chambers the mapping used for the paper model has been updated this year. NB: further optimisation of ROL mapping may be possible (in view of the relatively high LVL2 request rates for some of the ROBs), example (em cal): A few ROBIn’s Receive an RoI Request for as many As 8% of jets while For most it is ~3%. Detector parameters and modelling, TDAQ week December 2002

Fragment sizes From: overview of parameters used for 2001 paper model and of modifications in 2002 model, June 6, 2002 Apart from muon trigger chambers, numbers more or less in line with ROD workshop numbers. The paper model numbers for the inner tracker have been obtained from ATL-COM-DAQ-2002-002 and ATL-COM-DAQ-2002-012 = truncating event fragment Detector parameters and modelling, TDAQ week December 2002

Fragment sizes (cont.) Distributions of fragment sizes tend to have relatively small tails. Example from ATL-COM-DAQ-2002-002 (R. Scholte, Event Fragment Size Distributions for the Inner Detector), for barrel SCT ROBs: Detector parameters and modelling, TDAQ week December 2002

Fragment sizes (cont.) From ATL-COM-DAQ-2002-002: endcap pixels Detector parameters and modelling, TDAQ week December 2002

Fragment sizes (cont.) From ATL-COM-DAQ-2002-012: TRT ROBS with data compression Detector parameters and modelling, TDAQ week December 2002

No dramatic changes in number of ROL’s, ROL mapping and fragment sizes, but fragment sizes may require further study. It would be nice to have also for the calorimeters and for the muon detectors the type of results that are available in ATL-COM-DAQ-2002-002 and ATL-COM-DAQ-2002-012 Further optimisation of ROL mapping may be possible (in view of relatively high LVL2 request rates) NB: For modelling, ideal detectors without holes for services have been assumed until now. It is felt that taking holes into account will not affect the main modelling conclusions, as the rates will decrease somewhat in that case and somewhat more "headroom" will be available in a system designed on the basis of the current assumptions (i.e. "no holes" in the detector). Detector parameters and modelling, TDAQ week December 2002