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SIGNAL ANDSIGNAL AND BACKGROUNDBACKGROUND
SIMULATION AT THE SIMULATION AT THE RECOMBINATION RECOMBINATION
CHAMBERCHAMBER
Vadim TALANOVVadim TALANOV
CERN and IHEP, ProtvinoCERN and IHEP, Protvino
Joint LHC Machine-Experiments WorkshopJoint LHC Machine-Experiments Workshopon Very Forward Detectorson Very Forward Detectors
CERN January 25 2007CERN January 25 2007
A BIT OF HISTORY…A BIT OF HISTORY…
The start of the studies: need to estimate the The start of the studies: need to estimate the background from the p-p collisions at the IP in the background from the p-p collisions at the IP in the BLMs associated with the RPs in IR1/5BLMs associated with the RPs in IR1/5 For the TOTEM Roman Pots located between TAN and D2For the TOTEM Roman Pots located between TAN and D2
The intermediate sources of the signal and The intermediate sources of the signal and background were found of interest for other background were found of interest for other groupsgroups Primaries from the IP – for the flux of the neutral particlesPrimaries from the IP – for the flux of the neutral particles Cascade simulation results at the TAN – for the background analysis in Cascade simulation results at the TAN – for the background analysis in
the forward detectorsthe forward detectors
STAGES OF CALCULATIONSTAGES OF CALCULATION
Multi-staged scheme of the cascade simulationsMulti-staged scheme of the cascade simulations
DPMJET to get the primaries from the p-p DPMJET to get the primaries from the p-p interactions and to analyze the source terminteractions and to analyze the source term
FLUKA to take the generated sources and FLUKA to take the generated sources and transport the secondary cascades in the layout of transport the secondary cascades in the layout of the LSS down to the TANthe LSS down to the TAN
SOURCE SCORING ZONESSOURCE SCORING ZONES
at TASat TAN
19.05m from IP5
139.8m from IP5
DPMJET SOURCE AT THE IPDPMJET SOURCE AT THE IP
DPMJET version 3.0-4 usedDPMJET version 3.0-4 used
Two sets of sources generatedTwo sets of sources generated 7x7 TeV, horizontal crossing with 285 7x7 TeV, horizontal crossing with 285 µµradrad 450x450 GeV and no crossing450x450 GeV and no crossing
Analyzed with/without cut on |Analyzed with/without cut on |ηη|>7.8|>7.8 0.8924 mrad = 17 mm 0.8924 mrad = 17 mm (TAS half aperture) (TAS half aperture) / 19.05 m/ 19.05 m
PARTICLE FLUX AT THE TASPARTICLE FLUX AT THE TAS
RED: number of particles per 1 p-p event from the IPRED: number of particles per 1 p-p event from the IP BLUE: inside TAS aperture at BLUE: inside TAS aperture at ||ηη|>7.8|>7.8 only only
7 TeV 450 GeV
ENERGY FLUX AT THE TASENERGY FLUX AT THE TAS
RED: energy [GeV] per 1 p-p event from the IPRED: energy [GeV] per 1 p-p event from the IP BLUE: inside TAS aperture at BLUE: inside TAS aperture at ||ηη|>7.8|>7.8 only only
7 TeV 450 GeV
A COMMENT ON DPMJETA COMMENT ON DPMJET
Energy flux with DPMJET3 in the region of |Energy flux with DPMJET3 in the region of |ηη|>7.8 |>7.8 —— ~10.3 TeV/event ~10.3 TeV/event
This value can be directly compared with the one This value can be directly compared with the one from the previous DPMJET versionsfrom the previous DPMJET versions CMS Muon TDR p.398 CMS Muon TDR p.398 —— ~8.9 TeV/event ~8.9 TeV/event CMS Note 2000-051 p.1 CMS Note 2000-051 p.1 —— ~8.5 TeV/event ~8.5 TeV/event
A result of the change in the DPMJET forward A result of the change in the DPMJET forward physics models (?)…physics models (?)…
PARTICLE FLUX AT THE IPPARTICLE FLUX AT THE IP
7 TeV
450 GeV
All particles
γ+π0 n7 TeV 7 TeV
All particlesγ+π0 n
450 GeV 450 GeV
PARTICLE FLUX AT |PARTICLE FLUX AT |ηη|>7.8|>7.8
7 TeV
All particles
γ+π0 n7 TeV 7 TeV
450 GeV
All particles
γ+π0 n450 GeV 450 GeV
5.5 cmat TAN
5.5 cmat TAN
CASCADE SIMULATIONS IN IR5CASCADE SIMULATIONS IN IR5
DPMJET generated events with the cut at DPMJET generated events with the cut at ||ηη|>7.8 |>7.8 used as a primary sourceused as a primary source
FLUKA 2006.3 used for the cascade simulationsFLUKA 2006.3 used for the cascade simulations
Collision optics 6.5 at 7 TeV and 450 GeVCollision optics 6.5 at 7 TeV and 450 GeV
Particle distributions recorded and analyzed at Particle distributions recorded and analyzed at the TAN central area (the TAN central area (±±5.5cm in X,Y)5.5cm in X,Y)
PARTICLE FLUX AT THE TANPARTICLE FLUX AT THE TAN
RED: number of primary (from the IP) particles at the TANRED: number of primary (from the IP) particles at the TAN BLUE: total number of particles per 1 p-p eventBLUE: total number of particles per 1 p-p event
7 TeV 450 GeV
ENERGY FLUX AT THE TANENERGY FLUX AT THE TAN
RED: energy [GeV] of primary (from the IP) particles at the TANRED: energy [GeV] of primary (from the IP) particles at the TAN BLUE: total energy of particles per 1 p-p eventBLUE: total energy of particles per 1 p-p event
7 TeV 450 GeV
AVERAGE ENERGY AT THE TANAVERAGE ENERGY AT THE TAN
RED: average energy [GeV] of primary particles at the TANRED: average energy [GeV] of primary particles at the TAN BLUE: energy of all particles per 1 p-p eventBLUE: energy of all particles per 1 p-p event
7 TeV 450 GeV
COMPARISON OF THE COMPARISON OF THE ESTIMATESESTIMATES
Flux and spectra estimates are cross-checked Flux and spectra estimates are cross-checked with the existing datawith the existing data N.Mokhov (Fermilab, MARS) and H.Menjo (Nagoya University, EPICS)N.Mokhov (Fermilab, MARS) and H.Menjo (Nagoya University, EPICS)
EPICS: nice agreement at 7 TeV (450 GeV in EPICS: nice agreement at 7 TeV (450 GeV in progress)progress) Particle spectra and average energy comparedParticle spectra and average energy compared
MARS: Good agreement on average quantitiesMARS: Good agreement on average quantities Total P[W@10Total P[W@103434(8x10(8x1088 p-p inelastic interaction/s)] = 168 vs. 164 (NM) p-p inelastic interaction/s)] = 168 vs. 164 (NM) Factor ~2 difference in total multiplicity and average energyFactor ~2 difference in total multiplicity and average energy
HADRON FLUX AT THE TANHADRON FLUX AT THE TAN
LEFT: DPMJET-FLUKA, RIGHT: LHC Report 633 hadron (with E>20 MeV) LEFT: DPMJET-FLUKA, RIGHT: LHC Report 633 hadron (with E>20 MeV) flux density at the TANflux density at the TAN
For the rate of 8For the rate of 8101088 p-p inelastic interactions/s in IP5 p-p inelastic interactions/s in IP5
DPMJET+FLUKA2006.3
PARTICLE SPECTRA AT THE PARTICLE SPECTRA AT THE TANTAN
LEFT: DPMJET-FLUKA, RIGHT: LHCf data by H.MenjoLEFT: DPMJET-FLUKA, RIGHT: LHCf data by H.Menjo For the rate of 8For the rate of 8108 p-p inelastic interactions/s in IP5108 p-p inelastic interactions/s in IP5
DPMJET+FLUKA
LHCfdata2x10
3
5x104
50 GeV
106
CONCLUSIONCONCLUSION
DPMJET-FLUKA cascade simulation scheme DPMJET-FLUKA cascade simulation scheme established for the LSSsestablished for the LSSs
Calculations for the particle flux and energy Calculations for the particle flux and energy distribution for the forward detectors in the TAN distribution for the forward detectors in the TAN performed for 7 TeV and 450 GeV operationperformed for 7 TeV and 450 GeV operation
The results checked with the existing data and The results checked with the existing data and found coherentfound coherent
The source files will be available for the analysis The source files will be available for the analysis in the experimental groupsin the experimental groups
BACK-UP SLIDESBACK-UP SLIDES
PARTICLE FLUX AT 450 GEVPARTICLE FLUX AT 450 GEV
PARTICLE FLUX AT 7 TEVPARTICLE FLUX AT 7 TEV
PARTICLE SPECTRA AT THE PARTICLE SPECTRA AT THE TANTAN
7 TeV 450 GeV
COMPARISON WITH MARS (1)COMPARISON WITH MARS (1)
FROM IP <N> <E> (GeV) p 7.8106E-06 1.3928E+03 n 1.8278E-01 2.9556E+03 p+ 3.9053E-05 1.4448E+03 p- 1.2583E-03 2.5358E+03 K+ 3.9053E-05 1.5920E+03 K- 1.8779E-04 2.6675E+03 m+ 0.0000E+00 0.0000E+00 m- 0.0000E+00 0.0000E+00 g 6.4190E+00 7.9219E+01 e+ 2.3936E-01 3.3844E-01 e- 9.6830E-02 1.2591E+00 pbar 1.4059E-04 2.8715E+03 K0L 3.6506E-02 1.2308E+03 K0S 4.8158E-03 2.2434E+03 L 2.2313E-02 3.5788E+03 Lbar 6.3297E-04 1.8356E+03 S- 1.5640E-05 2.3074E+03 nbar 1.2447E-02 1.1503E+03
N.Mokhov TAN WS 10.03.06 p.7
COMPARISON WITH MARS (2)COMPARISON WITH MARS (2)
TOTAL <N> <E> (GeV) p 7.3862E-02 1.5663E+02 n 4.8929E-01 1.1694E+03 p+ 1.8048E-01 2.6559E+01 p- 2.0284E-01 4.9450E+01 K+ 1.3632E-02 2.3149E+01 K- 1.1683E-02 5.7245E+01 m+ 3.3441E-04 6.3382E+00 m- 7.6302E-04 9.9281E+00 g 9.5767E+01 5.4964E+00 e+ 6.1432E+00 1.5946E-01 e- 5.8856E+00 1.8103E-01 pbar 5.2652E-03 1.7274E+02 K0L 4.8855E-02 9.2650E+02 K0S 5.0332E-03 2.1485E+03 L 2.2313E-02 3.5788E+03 Lbar 6.3297E-04 1.8356E+03 S- 1.5640E-05 2.3074E+03 nbar 1.8694E-02 8.2330E+02
N.Mokhov TAN WS 10.03.06 p.7