E: notes on Atlas Luminosity

Luminosity Working Group Activities, M. Shapiro? - Jan 23, 2009 at the Physics Coordination Meeting

Meetings:

- Every first Thursday of the month - presentations
  (except for May Day, meeting moved to May 8)
- Every third Thursday of the month - coordination group

Documentation:

1. TWiki:Luminosity Working Group - used for 
   - general project description
   - plans
   - to do list

2. Hypernews
   - used to answer questions of general interest to the collaboration.

3. Luminosity Group email list in Samba (with archiving)
   for more technical details discussed among the Luminosity Group members
   and other experts.

Major tasks (subgroups):

• machine parameters into COOL:
  Elizabeth, Thilo, Siggy. cc: RH, HvdS
• luminosity from the LHC
  Helmut Burkhart (LHC), ???
• Deadtime corrections:
  Elizabeth, Thilo, Marco
• Online monitoring
• Offline analysis can determine luminosity from cross sections of known SM signatures. Luminosities for other processes obtained relative to known.
  Two physics groups:
  • SM minbias - better at low luminosity
  • SM heavy bosons - better at high luminosity
• methods for combining Luminosity measurements, getting best measurement.
• provenance, reconstruction failures, file losses along the chain of data movements, processing, reprocessing, thinning, slimming, skimming

What machine parameters are available ?  How is it structured ?

How are 'machine parameters' stored by the LHC ?

Are all parameters relevant to ATLAS ?  with uncertainties ?

What tools are available to obtain/transfer this information for ATLAS?

How does the temporal structure of the machine parameters 
map onto ATLAS IOV (in time and/or Run-lumi block) 

Jim Cook has put DCS information into COOL. can similar mechanisms be used
to put LHC machine parameters into COOL?

COOL must store some combination of 
    duration, 
    deadtime, 
    instantaneous luminosity
    delivered luminosity 
by Run/Lumiblock in COOL.
For now, put into TRIGGER/LUMI/LBLEST/
OnlineLumi_del  - 
OnlineLumi_inst - 
LiveFraction    - fraction of duration when L1 accept not inhibited.
    The Lumi task force specifies triggers may be split into a 
        high priority and a low priority set.  
    It is logical that this flag come from Trigger DB -- 
        is it implemented?
    Where would it appear in the trigger configuration xml file ?

Bunch to bunch information will also be required - the level at which it might
    be needed/used in general physics analysis is unknown
    (analysis dependent, depends on variation in bunch density

make sure the BCID of recorded events are distributed as expected, 
    proportional to the bunch population (?) - 
    Look for stream, trigger, priority, prescale dependence.

Run Coordination issues.
  run_type = physics - current data is but is not
  number of simultaneous physics runs

There's nothing in Monte Carlo about luminosity.

Event header has BCID, but nothing else.  
A quick and dirty instantaneous luminosity might be useful.

• June 5, 2008 Luminosity Group meeting -- I missed this meeting, look at the slides.
  • H1 Luminosity: Witold Krasny - Pierre et Marie Curie University - Paris

    Goal: Develop the method, the detector and the trigger system designs to achieve O(1%) absolute normalisation precision, and O(0.1% ) precision of the relative normalisation of event samples taken at various energies and/or using different beam species?

    final state is hadrons separated by a rapidity gap containing a lepton pair.
    cs varies from 10^-3 to 10 nb with 1(GeV/c)/p_t^thr from .2 to 3.
    detector is TRT-C-wheels space.
    Lepton identification efficiencies and acceptances must be determined,
    (time variation must be controlled ) directly from the experimental data!
    
    use: Dalitz pairs, and hadronic resonances
    	      

  • Marco Bruschi - June 5, 2008: Luminosity Measurement from Hera B.
  • Laura Fabbri - Luminosity monitoring using LUCID

    
    mu = cs(inel) * L(BCID) / f(BCID) = # interactions per BCID
    
    Measure the fraction of crossings with pp interactions
    * P(0) = e ^ -mu      = prob of no interaction (zero Counting method)
    * P(1) = mu * e ^ -mu = prob of one interaction (One Counting method)
    
    Direct counting # of pp interactions
    * Counting particles
    * Counting hits
    
    Use LUMAT Simulation
    
    Conclusions:
    * Method sensitive to bunch luminosity and not integrated luminosity
    * very high bunch-luminosity is likely to spoil linearity

• Report from the Luminosity Task Force / Ask, S; Malon, D; Pauly, T; Shapiro, M ATL-GEN-PUB-2006-002
• ATLAS eNews: A new sub-detector for ATLAS (named LUCID) Marco Bruschi; (Universita & INFN, Bologna) - Oct 2007
• ATLAS eNews: Moving Forward - Progress on Forward Detectors Grafstrom, P.; (CERN) 22 Jun 2006
• Luminosity Measurement at the Large Hadron Collider /Caron, B L; Pinfold, J L (dir.) Two novel methods of measuring the luminosity delivered to the ATLAS Experiment at the CERN Large Hadron Collider experiments are presented. [...] 2006 Edmonton, AL : University of Alberta, . - 161 p [CERN-THESIS-2006-024]
• Simulation of Luminosity Monitoring in ATLAS / Ask, S A fast and flexible simulation program has been written and used to study different aspects related to the luminosity monitoring in ATLAS. [...] ATL-LUM-PUB-2006-001; ATL-COM-LUM-2005-002.- Geneva : CERN, 21 Sep 2005 . - 18 p
• Prediction for minimum bias and the underlying event at LHC energies / Moraes, A; Buttar, C; Dawson, I In this report we investigate the models employed by PYTHIA and PHOJET Monte Carlo event generators used to describe soft interactions in hadron-hadron collisions. [...] SN-ATLAS-2006-057; Geneva : CERN, 2005 . - 35 p
• ATLAS Forward Detectors for Measurement of Elastic Scattering and Luminosity / Jenni, Peter et al. ATLAS-TDR-018 ; CERN-LHCC-2008-004. ATLAS-TDR-018 ; CERN-LHCC-2008-004. - Geneva : CERN, 2008.
• ALFA : Absolute Luminosity For ATLAS, a scintillating fibre tracker / Mapelli, A - ATLAS Collaboration. The ATLAS collaboration plans to determine the absolute luminosity of the CERN LHC at Interaction Point 1 by measuring the trajectory of protons elastically scattered at very small angles (µrad). A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement. [...] ATL-SLIDE-2008-013; CERN-ATL-SLIDE-2008-013.- Geneva : CERN, 2007 - 24 p.
• System Design of the ATLAS Absolute Luminosity Monitor / Anghinolfi, Francis (CERN); Blanchot, Georges (CERN); Franz, Silvio (CERN); Iwanski, W (CERN ; INP PAN, Cracow); Lundberg, B (Lund Univ., Lund) 2007
• Run II D0 Bests (Luminosity History)
• Some Luminosity plots versus time
• FNAL BD Store Information Columns # 0 Store # 1 time started set up # 2 time proton load # 3 time pbar load # 4 time HEP # 5 date/ time end store # 6 store length (hours) # 7 how store ended # 8 Comments. # 9 Shot type # 10 MCR CDF initial lum - default (1E30) # 11 MCR D0 initial lum - default (1E30) # 12 MCR avg initial lum - default (1E30) # 13 SDA CDF initial lum (1E30) # 14 SDA D0 initial lum (1E30) # 15 SDA avg initial lum (1E30) # 16 calculated CDF initial lum (1E30) # 17 calculated D0 initial lum (1E30) # 18 delivered lum to CDF for this store (nb-1) # 19 delivered lum to D0 for this store (nb-1) # 20 total delivered lum to CDF in RunII(pb-1) # 21 total delivered lum to D0 in RunII (pb-1) # 22 avg total delivered lum in RunII(pb-1) # 23 CDF lum lifetime (hours) # 24 D0 lum lifetime (hours) # 25 avg lum lifetime (hours) # 26 CDF lum at the end of HEP (1E30) # 27 D0 lum at the end of HEP (1E30) # 28 calculated CDF lum at the end of HEP (1E30) # 29 calculated D0 lum at the end of HEP (1E30) # 30 start RR stash (1E10) # 31 RR unstacking fraction # 32 amount unstacked from RR (1E10) # 33 RR pbars at MI, 8 GeV (1E10) # 34 RR pbars at MI, 150 GeV after coal. (1E09) # 35 SBD pbars at Tev, 150 GeV (1E09) # 36 FBI, pbars at Tev, 150 GeV (1E09) # 37 SBD, pbars at Flattop (1E09) # 38 SBD, pbars at Initiate Collisions (1E09) # 39 SBD pbars at Remove Halo (1E09) # 40 FBI, pbars at Remove Halo (1E09) # 41 SBD pbars/bunch at Remove Halo (1E09) # 42 FBI, pbars/bunch at Remove Halo (1E09) # 43 SBD, pbars at Pause HEP (1E09) # 44 Booster turns # 45 Booster bunches # 46 p Booster intensity (1E09) # 47 p at MI, 8 GeV (1E09) # 48 p at MI, 150 GeV after coal. (1E09) # 49 SBD p at Tev injection (1E09) # 50 FBI, p at Tev injection (1E09) # 51 SBD, protons at Flattop (1E09) # 52 SBD, protons at Initiate Collisions (1E09) # 53 SBD p at Remove Halo (1E09) # 54 FBI, p at Remove Halo (1E09) # 55 SBD p/bunch at Remove Halo (1E09) # 56 FBI, p/bunch at Remove Halo (1E09) # 57 SBD, protons at Pause HEP (1E09) # 58 DC Beam (1E12) # 59 DC Beam Lifetime (hours) # 60 pbar H RR extracted emitt (pi-mm-mrad) # 61 Rec. FW Horizontal Emittance # 62 pbar H emitt, MI 8 GeV (pi-mm-mrad) # 63 pbar H emitt, MI 150 GeV (pi-mm-mrad) # 64 pbar H emitt Tev 150, before ramp (pi-mm-mrad) # 65 pbar H emitt Tev 980, Flattop (pi-mm-mrad) # 66 pbar H emitt, Remove Halo (pi-mm-mrad) # 67 pbar V RR extracted emitt (pi-mm-mrad) # 68 Rec. FW Vertical Emittance # 69 pbar V emitt MI, 8 GeV (pi-mm-mrad) # 70 pbar V emitt, MI 150 GeV (pi-mm-mrad) # 71 pbar V emitt Tev 150, before ramp (pi-mm-mrad) # 72 pbar V emitt Tev 980, Flattop (pi-mm-mrad) # 73 pbar V emitt, Remove Halo (pi-mm-mrad) # 74 pbar avg (H+V)/2 emitt, Remove Halo (pi-mm-mrad) # 75 p H emitt, MI 8 GeV (pi-mm-mrad) # 76 p H emitt, MI 150 GeV (pi-mm-mrad) # 77 p H emitt Tev 150, before ramp (pi-mm-mrad) # 78 p H emitt Tev 980, Flattop (pi-mm-mrad) # 79 p H emitt, Remove Halo (pi-mm-mrad) # 80 p V emitt, MI 8 GeV (pi-mm-mrad) # 81 p V emitt, MI 150 GeV (pi-mm-mrad) # 82 p V emitt Tev 150, before ramp (pi-mm-mrad) # 83 p V emitt Tev 980, Flattop (pi-mm-mrad) # 84 p V emitt, Remove Halo (pi-mm-mrad) # 85 p avg (H+V)/2 emitt, Remove Halo (pi-mm-mrad) # 86 pbar H emitt at Remove Halo from SL (pi-mm-mrad) # 87 pbar H emitt at begin HEP from SL (pi-mm-mrad) # 88 pbar H emitt at end HEP from SL (pi-mm-mrad) # 89 pbar V emitt at Remove Halo from SL (pi-mm-mrad) # 90 pbar V emitt at begin HEP from SL (pi-mm-mrad) # 91 pbar V emitt at end HEP from SL (pi-mm-mrad) # 92 p H emitt at Remove Halo from SL (pi-mm-mrad) # 93 p H emitt at begin HEP from SL (pi-mm-mrad) # 94 p H emitt at end HEP from SL (pi-mm-mrad) # 95 p V emitt at Remove Halo from SL (pi-mm-mrad) # 96 p V emitt at begin HEP from SL (pi-mm-mrad) # 97 p V emitt at end HEP from SL (pi-mm-mrad) # 98 pbar H emitt growth (hours) # 99 pbar V emitt growth (hours) # 100 p H emitt growth (hours) # 101 p V emitt growth (hours) # 102 Hourglass factor at CDF for first HEP set # 103 Hourglass Factor at CDF for Last HEP set # 104 Hourglass factor at D0 for first HEP set # 105 Hourglass factor at D0 for last HEP set # 106 Effective emitt from luminosities at CDF (pi-mm-mrad) # 107 Effective emittances from luminosities at D0 (pi-mm-mrad) # 108 Effective emitt from emittances (pi-mm-mrad) # 109 RR pbar L emitt (eV-s) # 110 MI 8 GeV avg bunch length (ns) # 111 pbar L emitt at MI 8 GeV (eV-s) # 112 pbar L emitt at MI 150 GeV (eV-s) # 113 MI pbar bunch length at MI 150 GeV, before extraction (ns) # 114 Tev pbar bunch length at 150, before ramp (ns) # 115 Tev pbar bunch length at Remove Halo (ns) # 116 MI p bunch length after coalescing (ns) # 117 Tev p bunch length at 150, before helix opened (ns) # 118 Tev p bunch length before ramp (ns) # 119 Tev p bunch length at Remove Halo (ns) # 120 p bunch growth (hours) # 121 pbar bunch growth (hours) # 122 time on helix (minutes) # 123 p lifetime on helix (hours) # 124 pbar lifetime at 150 (hours) # 125 p lifetime, 1st 2 hours into store (hours) # 126 pbar lifetime, 1st 2 hours into store (hours) # 127 avg p and pbar lifetime, 1st 2 hours into store (hours) # 128 p not lum lifetime, 1st 2 hours into store (hours) # 129 pbar not lum lifetime, 1st 2 hours into store (hours) # 130 pbar to MI transfer eff (avg) # 131 pbar to MI transfer eff (sum) # 132 pbar MI accel. eff, RR (avg) # 133 pbar MI accel. eff (sum) # 134 pbar MI coalescing eff, RR (avg) # 135 pbar MI coalescing eff (sum) # 136 pbar Tev inj eff # 137 pbar Tev accel. eff # 138 pbar eff, Tev Remove Halo/Flattop # 139 pbar avg eff at 150 on helix # 140 pbar avg accel. eff, Flattop/Pbar Inj porch # 141 pbar avg eff in squeeze # 142 pbar overall RR->HEP # 143 p Booster to MI transfer eff # 144 p MI accel. eff # 145 p MI coalescing eff (avg) # 146 p MI coalescing eff (sum) # 147 p Tev inj eff # 148 p avg eff at TeV 150 on helix # 149 p Tev accel. eff # 150 p avg eff in Squeeze # 151 p overall Booster->HEP # 152 pbar H Tune at begin HEP # 153 pbar H Chromaticity at begin HEP # 154 pbar V Tune at begin HEP # 155 pbar V Chromaticity at begin HEP # 156 p H Tune at begin HEP # 157 p H Chromaticity at begin HEP # 158 p V Tune at begin HEP # 159 p V Chromaticity at begin HEP # 160 CDF p losses, HEP, max among all sets (Hz) # 161 D0 p losses, HEP, max among all sets (Hz) # 162 CDF p losses, HEP, avg over first 20 sets (Hz) # 163 D0 p losses, HEP, avg over first 20 sets (Hz) # 164 CDF pbar losses, HEP, max among all sets (Hz) # 165 D0 pbar losses, HEP, max among all sets (Hz) # 166 CDF pbar losses, HEP, avg over first 20 sets (Hz) # 167 D0 pbar losses, HEP, avg over first 20 sets (Hz) # 168 D:OUTTMP at first HEP set # 169 L:CBAR at first HEP set # 170 G:DEWPNT at first HEP set # 171 G:HUMID at first HEP set # 172 L0, Simple # 173 Tau, Simple # 174 Chisq, Simple # 175 L0 Modified Exp # 176 TAU Modified Exp # 177 C1 Modified Exp # 178 C2 Modified Exp # 179 Chisq Modified Exp # 180 L0 1/time # 181 TAU 1/time # 182 exponent 1/time # 183 Chisq 1/time # 184 L0 Modified 1/time # 185 TAU Modified 1/time # 186 C1 Modified 1/time # 187 C2 Modified 1/time # 188 Chisq Modified 1/time # 189 start Accum. stack (1E10) # 190 amount unstacked from Accum. (1E10) # 191 pbar H Acc core emitt (pi-mm-mrad) # 192 pbar V Acc core emitt (pi-mm-mrad) # 193 Accum. avg bunch length (ns) # 194 pbar to MI transfer eff, RR (avg) # 195 pbar overall RR+Accum.->HEP # 196 pbar L emitt at MI 8 GeV (eV-s) - Recycler # 197 TeV pbar bunch length at Flattop # 198 TeV p bunch length at Flattop # 199 Alt. Pbar Longitudinal Emittance MI 8 GeV # 200 Alt. P Longitudinal Emittance MI 8 GeV # 201 P Longitudinal Emittance MI 8 GeV # 202 P Longitudinal Emittance MI 150 GeV # 203 Alt. Pbar Longitudinal Emittance MI 150 GeV # 204 Alt. P Longitudinal Emittance MI 150 GeV 6305 07/18/2008 22:53:22 07/18/2008 23:20:48 07/18/2008 23:42:45 07/19/2008 00:27:38 07/19/2008 03:29:33 3.00 Not Completed need rebuild Rec. only 240.42 236.16 238.29 239.05 233.16 236.11 251.20 261.01 1954.05 1915.39 4522.95 4345.46 4434.20 5.48 5.60 5.54 145.67 143.7690 0 0 289.02 .96 278.80 275.03 2746.07 2421.24 2398.43 2398.07 2337.40 2267.34 2218.90 62.98 61.64 0 11.00 7.00 16559.69 14612.50 11183.12 11269.67 11323.48 10442.95 10249.14 9774.24 9573.19 271.51 265.92 0 11.99 20.71 0 1.70 0 0 7.65 7.61 7.58 0 1.60 0 0 4.36 4.28 8.10 7.84 17.53 14.07 16.19 22.02 16.11 6.58 2.04 16.43 14.80 14.59 15.35 11.90 10.57 12.47 8.86 8.28 10.34 20.74 19.66 22.08 18.48 17.55 18.99 -10.89 -10.19 -22.06 -28.56 .60 .57 .58 .55 11.83 12.58 11.59 67.25 1.68 .84 1.92 2.12 2.44 1.51 2.51 2.99 2.84 1.70 -24.34 -27.54 23.88 5.08 23.12 23.48 15.40 19.44 31.04 50.88 .986 .986 .998 .998 .877 .877 .998 .978 .942 1.000 .980 .988 .794 .868 .902 .864 .864 1.025 .930 .969 .992 .578 .5940 .01000 .5900 .00300 .5900 4.82600 .5900 2.26300 2554.69 7883.47 0 0 304.69 1759.52 0 0 73.15 989.01 69.94 84.20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .99 .79 .84 1.48 1.71 1.40 1.43 .78 2.55 2.96 3.95

Provenance (Noun) Where something originated or was nurtured 
         in its early existence;
Scalar - (adj) directionless magnitude; 
         (noun) variable quantity that cannot be resolved into components.
Scaler - electronic pulse counter used to count pulses that occur 
         too rapidly to be recorded individually.
Verses - plural of verse: piece of poetry, metrical text, literacture in metrical form.
Versus - Against; as, John Doe versus Richard Roe; abbreviated to v. or vs.

• LuminosityOnlineSummary ( los)
• TWiki > Atlas Web > DataPreparation > LuminosityOnlineMonitor ( lom)
• TWiki > Atlas Web > DataPreparation > LuminosityOnlineCool ( loc)