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Mozaic trigger system for high transverse momentum physics

Mozaic trigger system for high transverse momentum physics. A.Fulop(ELTE) , G.Vesztergombi (KFKI-RMKI) C HEP Prague March , 200 9. Motivation for new measurements below = 20 GeV. Practically no high or medium P t data between E inc = 24 and 200 GeV

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Mozaic trigger system for high transverse momentum physics

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  1. Mozaic trigger system for high transverse momentum physics A.Fulop(ELTE), G.Vesztergombi (KFKI-RMKI) CHEP Prague March,2009

  2. Motivation for new measurements below = 20 GeV Practically no high or medium Pt data between Einc = 24 and 200 GeV Mysterious transition around 80-90 GeV: convex versus concave spectra Energy threshold for Jet-quenching? Emergence of Cronin-effect in pA interactions is completely unknown energy dependence centrality dependence particle type dependence particle correlations Production of Upsilon (9.5 GeV) particles near the threshold.

  3. Beier (1978) NA49 (CERN) results at 158 FODS (IHEP) at 70 GeV

  4. Special requirements for Y-> e+e- and high pT Extremely high intensity - Pile-up Segmented multi-target - Relaxed vertex precision Straight tracks - High momentum tracks DREAM: 109 interactions/sec

  5. High ( > 5 GeV/c ) momentum  Straight track x,y [cm] Px=Py= 3 GeV/c Pz = 10 GeV/c Px=Py = 1 GeV/c; Pz= 5 GeV/c z [cm]

  6. MAPS vs Hybrid Vertex resolution: dz = 1 mm, dx,dy= 0.05 mm High intensity: radiation hard Practical 4+ 2 + 3 = 9 planes ( 4 Hybrids + 5 strips) Selectivity depends on the availability of TOF information

  7. 3 dimensional scheme k=3 i+1 k=2 i k=1 j j+1 Mosaic cells in plane “k” : M(i,j,k) (i,j) Corridor contains: M(i,j,k), M(i,j+1,k), M(i+1,j,k), M(i+1,j+1,k) k=1,2,3

  8. Silicon planes 4 hybrids 2 + 3 strips (XX,YY,ZZ) a delta * * * * * * * * * s = sqrt(XX*XX+YY*YY) - delta 2 4 Basic planes 6 Sagitta: 10-20 cm track sections are practically straight fractals

  9. New algorithm Matching in #1 and #3 pixel planes in space Separate track matching in xand y for planes 5-9 Parallel processing: CORRIDOR # corNum Basic planes: #2 = (x2,y2,z2) pixel , #4 = (x4,y4,z4) pixel, #6 = (x6,z6) strip Straight tracking in #2 and #4 planes in space => (mx,bx) and (my,by) Approximation: starting direction is given by (mx,my) TUBE definition: x-tube: xi = mx*(zi-z2) +bx +parabol(x6,z6,zi) +/- deltaxi y-tube: yi = my*(zi-z2) +by +/- deltayi

  10. Mozaic DAQ system Two separate systems: PRETRACKING network: Pixel [#2 , #4] + Strip [#6x] TRACK-QUALITY TUBE network: Pixel [ #1, #3] + Strip[#5x, #5y, #6y, #7x, #7y, #8x, #8y, #9x, #9y] In each network parallel CORRIDOR processors: CorID =corNUM Number of CORRIDOR processors: ndx*ndy Data select their routes according to plane number and corNUM In plane „zi” track-hit „xi,yi” calculates its corridor address: corNum = idx*ndy + idy

  11. Corridor processors OLD system: consecutive cycling on all „planes” If only 2 points per plane: number of cycles = 2(4+2*5) = 214 = 16384 NEW system: cycling only on 3 „planes” (for pixels x and y has common cycle) If only 2 points per plane: number of cycles = 2(2+1) = 23 = 8 The PRETRACKING is producing a list containing: corNUM, x1,x3,x5,x7,x8,x9, y1,y3,y5,y6,y7,y8,y9 There is NO PROCESSING TIME in the TRACK-QUALITY TUBE network because It is only an ASSOCIATIVE memory which provides YES/NO. The gain in processing time (if only 2 points per plane): 211 = 2048-fold

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