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The 2 detector options today …. SiD vs TDR [ * ]

The 2 detector options today …. SiD vs TDR [ * ]. TRACKER. SiD TDR. Silicon tracker TPC for TDR. CALORIMETRY. ECAL tungsten-silicon both options HCAL Digital (RPC,GEM,..) Digital / Tile AHCAL. Partly the same people. [ * ] J.Jaros at ALCPG-SLAC04. The 2 options of J.Jaros.

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The 2 detector options today …. SiD vs TDR [ * ]

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  1. The 2 detector options today …. SiD vs TDR[*] TRACKER SiD TDR Silicon trackerTPC for TDR CALORIMETRY ECALtungsten-silicon both options HCAL Digital (RPC,GEM,..) Digital / Tile AHCAL Partly the same people [*]J.Jaros at ALCPG-SLAC04

  2. The 2 options of J.Jaros ECAL Silicon cost TDR Silicon cost SiD ~ 2.6 HCAL

  3. Reducing the external radius of the TPC (reduce the cost of the overall detector) if needed a precise point outside TPC can be added ??  what about the separation charged-neutral ?? See next slides See later Radius, length, size, … What is the reason for 2.50m for the TPC length  Covering at low angle ? but the FTD is doing it with FCH Tracker size What is the reason for the TPC radius of 1.60m  Single track resolution ?  Separability ? What is the reason for 1.70m for the ECAL radius TPC radius + 10cm Charged track - photon separation ECAL size

  4. Strips along RΦ in the barrel Need precise point(s) Just before the ECAL (large radius) ?? Reducing the external radius of the TPC Add alveoli without tungsten ▪ Minimize the thickness/”tracker point” ▪ Minimize the distance to the ECAL ▪ Minimize the inter alignment tracker-ECAL ECAL module Of course It could be a pixels device or a double side det. with strips … if the cooling for the VFE is not needed or if it fits inside the alveoli … Example for the TPC T0 ∆Z≈ Strip Width

  5. Possible scheme of a “tracker” alveoli Silicon Strips Matrix PCB or Kapton IN-OUT VFE + ADC+ MUX The overall thickness fits inside the standard alveoli of the ECAL

  6. Geometry of the calorimeter ECAL-SiD- ALCPG ECAL-TDR- CALICE 1.27m 1.68m Is it so different ? At least , there is a good agreement on the global geometry [*] [*]The calorimeter 8-fold way of Henri Videau

  7. The ECAL internal radius Presentation at LBL 2000 – LC meeting e+e–→ ZH → jets at √s = 500 GeV SD geometry TDR geometry WARNING SD here use B=6T while now people talk of B=5T For SD geometry, there is an average of ~65GeV of photons closer than 2.5 cm versus ~20 GeV for the TDR geometry

  8. What for different physics process The average is here Example here with B=4T, R=170cm at 800 GeV e+e–→ W W at √s = 800 GeV Energy per event for photons closer than 2.5 cm from a charged track At the ECAL entrance Fraction of the photons energy 14% of the sample GeV Distance to closest CH. cm

  9. Variation with the ECAL endcap entrance Internal radius fixed at 1.50 m and B=4T Length of the TPC We define Rm at 2cm SiD Value W W final state at 800 GeV When going to 1 TeV Fraction of photons energy at D<Rm Distance of the ECAL endcap Efficiency of reconstructing photons close to ch. track (D<Rm) is <<100%

  10. Variation with the internal ECAL radius Z endcap at 2.00 m and B=4T We define Rm at 2cm SiD Value W W final state at 1 TeV Fraction of photons energy at D<Rm Internal radius of the ECAL SiD Values Rint=125, Zec=170 and B=5T

  11. Curves ISOCOST(area) versus SiD TESLA TDR 20 layers Length of the ECAL barrel 25 layers Possible Interesting Region 30 layers SiD detector Internal radius of the ECAL

  12. The relevant law is in BR2/Rm For the TDR type of detector (R=170cm and 4T) 14% of the events have more than 50 GeV in the difficult region For the SiD detector (R=125cm and 5T) 32% of the events have more than 50GeV in the difficult region VERY IMPORTANT NUMBERS For the photon(s) reconstruction , the ECAL radius is much more important !!! Impact on the jets to be quantified To reduce the ECAL cost, Playing with the layers number is more efficient and less penalizing for the performances on jet, ,… ?! + the TPC length could also be reduced without a strong effect ? (my guess) Do we goNOWto15-20 layersECAL at R=1.40 -1.50m??

  13. VFE inside DAQ-ADC board Summary of the ECAL change vs TDR ► VFE inside for the ECAL, alveoli thinner , better eff. Molière radius ► For the simulation, I propose to use 30 layers to be consistent with the SiD ECAL Changing the general geometry ► VFE inside for the HCAL (Si-PM, or digital readout for DHCAL) → NO SPACE for fibbers in overlap !!! → NEW distance TPC-ECAL in endcap !!!!  ECAL readout VFE (with ADC?) send each BX to DAQ board (with/without ADC)  DAQ-ADC board digitise, store in digital memory, MUX to optical link ▪ VFE time occupancy is about 1/200 for TESLA ▪ VFE On-Off take about 100 s  1/20 is a reasonable value of the duty cycle Passive cooling would be sufficient R&D in CALICE ECAL with MOU between IN2P3 and MOST to quantify this passive cooling limit

  14. Other open questions • ► Quantitative variation of performances on jet(s) • (and impact on physics program) with TPC size • ► Is there a way to avoid the hole between Forward CAL and ECAL • together with the possibility to open the detector ? • ► The CALOR. endcap geometry must be reviewed • ► ECAL as the track seed for SiD tracker ? • a kind of substitute for the TPC number of points • ► FCH (SET?) in silicon device inserted in ECAL CFi frame ? • ► What is the number of X0 of the endplate and readout electronics ? • what is the distance TPC-ECAL ?

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