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ECAP Simulation Status for KM3NeT TDR

This article provides an update on the status of ECAP simulations for the KM3NeT Technical Design Report (TDR) including cable-based design, multi-PMT optical module configurations, and detector physics events. It also discusses the simulation of atmospheric muons using the MUPAGE software.

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ECAP Simulation Status for KM3NeT TDR

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  1. Status of ECAP Simulations for the KM3NeT TDR Rezo Shanidze KM3NeT WP2 meeting Paris, 10-11 December 2008

  2. KM3NeT simulations: from CDR to TDR Path to TDR : Write up for cable-based design New multi-PMT OM design (from NIKHEF) String design (NIKHEF)

  3. Multi-PMT OM in cabled design Multi-PMT OM configurations Reference detector vs. Write-up 1. Glass sphere 6. Cooling 4. Communication Concentrator 3. PMT base 2. PMT • fromNIKHEF (E. de Wolf, E. Heine ) presentations • at KM3NeT WP 3/4/5 meeting, Paris, 15-16/19/2008 5. Optical interface

  4. Write-up for cabled design V3.4 14/10/2008

  5. KM3NeT detector simulations in ECAP ANTARES Software: detector physics events PMT hits reconstruction • genhen • mupage gendet km3 reco Simulations in ECAP after CDR • New PC-farm in ECAP Erlangen • ANTARES/KM3NeT software installation on PC-farm • mupage for atmospheric-m simulations in KM3NeT PC-farm and ANTARES/KM3NeT related software: Ralf Auer and Claudio Kopper

  6. ECAP PC-farm for KM3NeT simulations • ECAP PC-farm with Grid Engine queuing system • Used by all ECAP groups: • ANTARES, KM3NeT, H.E.S.S., Detector development 130 interactive nodes 260 batch nodes common disk Space ~ 25 TB

  7. New detector configuration • CDR reference detector g new detector: • same instrumented volume ( 1km3), total photocathode area, • number of detection units ( n x n = 15x15=225) V= A x LDU, A = (n-1)2xd2 CDR: LDU = 595 m, d = 95 m, 1.05 km3 OMs = 225 x 37 St. = 8325; PMTs =174825 (21x8325) New: LDU= 493 m, D= 105 1.07 km3 OMs = 225 x 25 St. = 5625; PMTs =174375 (31x5625) m g Down-looking PMTS OM with 31x3” PMTs. CDR

  8. Effective Area Detector configuration: s25om31d105 Effective area of s25om31d105 configuration, calculated for the different conditions.

  9. Detector configuration: s25om31d105 Effective Area vs neutrino angle • Next step: • Detailed comparison of • effective area • angular resolution • for CDR reference detector and new configuration.

  10. Simulation of atmospheric muons: MUPAGE • Input: • detector surface and physics information: • detector geometry, depth • Medium: water/ice • zenith angle range [0o,85o] • max distance of m from the • shower axis in a bundle [100m] • Range of muon energy [20,105] GeV • Range bundle multiplicity [0,1000] • Output: • ascii files in table format • Equivalent livetime of simulated run m bundle on a can surface Example from M.Spurio (VLVnT08): R, h ~ 300 / 600 m A=1.4 km2 depth = 2.5 km w.e. Livetime = 1 month Em> 20 GeV , m=[0,100]. 3.6 109 bundles 358 files (2h livetime), 600 GB (ascii) CPU: 360 h (2xIntel Xeon Quad Core, 2.33 GHz)

  11. MUPAGE simulations @ECAP New simulations with v3.1 ( bug in v2.2, G. Carminati ANTARES PAW meeting, Rome, 25-11-2008) Currentevent sample withmupage v 3.1 : 107 events (m-bundles) at 3 different depth: 2500, 3500, 4800 m with same CAN parameters: R ≈1.2 km, h ≈ 0.8 km, A ≈ 10.3 km2 MUPAGE simulations @ ECAP PC-farm ( 10 7 events) atm-m simulation (MUPAGE ) requires large computing resources and large scale simulations could be performed for the selected TDR detector. Livetime = 1 month for KM3NeT ~ 3 x 1010m-bundles /2500 m

  12. MUPAGE data Angular distribution of m-bundles at 3 different depth • Solid angle for • Neutrino observation • W = 2p (1 - cosQ) • is slightly larger for • 4800 m • mupage simulations: • cosQm < -0.087 • For 2.5/3.5/4.8 km • cosQm < • -0.116/-0.127/ -0.178 Detector at: -2500 m -3500 m -4800 m

  13. Expected n, atm-m and 40K rates in KM3NeT • Expected n rate in KM3NeT: few x 10-3 Hz ( 1 n in few minutes ) • Expected atm-m-rate ( > 5 hit, Hz) : 2500 / 500 / 100 • ( > 10 hit, Hz) : 1750 / 360 / 70 • ( > 100 hit, Hz) : 40 / 6 / 1 • Expected 40K hits/10ms : ~ 7000 ( for 4kHz/PMT, 4% of PMTs ) [ 2.4 / 3.5 / 4.8 km] atm-m hit rate for MultiPMT det. at 2500 m calculated with MUPAGE and KM3( 2.5 km ) Mean number of hits ~ 15.5

  14. Reconstruction of atm-m events • Example of atm-m • reconstruction of • mupage (v2.2) events. • No quality cuts ! Reconstruction of m-events: - necessary to estimate the ate of miss-reconstructed atm-m sample. (keep < 10% for n-sample) Reconstruction code in ECAP for KM3NeT: RECO/Aart strategy ( with modifications by S.Kuch )

  15. Summary and outlook • KM3NeT detector simulation is fully operational and running • @ ECAP PC-farm ( thanks to Ralf Auer and Claudio Copper ! ) • Atmospheric m simulations (MUPAGE) are included in the • KM3NeT TDR studies. • ECAP simulations for TDR will be performed for the cabled design • option of the KM3NeT detector. • Most of the tools needed for the analysis of simulated events are • already developed in ECAP ( PhD of Sebastian Kuch). • The results for the KM3NeT TDR simulations should be cross- • checked with other groups.

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