Beam MC activity

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Beam MC activity. A.K.Ichikawa for beam group. For more details, http :// Summary of update in 09a,b,c. 09a
Beam MC activityA.K.Ichikawa for beam groupFor more details, of update in 09a,b,c
  • 09a
  • This is almost equivalent to 07a except some bugs were fixed. Those bugs would not influence the neutrino flux iteslef.
  • 09b
  • Mainly, geometry of baffle, target, 1st horn, dump and MUMON is updated.
  • 09c
  • MUMON structures were included.
  • Energy deposit in the MUMON detector can be stored.
  • Emittance and Twiss parameters can be specified via card.
  • Neutrino tracking is discarded.
  • The density of the dump concrete was changed from 2.2 to 2.3g/cm3.
  • K. MatsuokaComparison among different versionsK. MatsuokaMUMONA few bugs introduced in 2009 were found and fixed. Mainly in horn1.
  • Magnetic field (proportional to 1/r) starts from r=2.7cm
  • Horn1 inner conductor
  • Inner radius = 2.7cm, outer radius=3cm
  • Originally it starts from 3cm
  • Actually, something between them (skin depth > 5mm)
  • For MUMON, a few% effect
  • A.Arigaet. al.Muon flux at muon pitSpring commissioning (1st horn only)Emulsion v.s. MC0kA Data/MC=0.57220kA Data/MC=0.75273kA Data/MC=0.78H.Kubohorn2 and horn3 Geometry updateupdate from conceptual shape to real shape
  • Horn2
  • outer conductor radius : 40 cm -> 49.048 cm
  • B-field region (Z-length) : 200 cm ->195.7 cm
  • Horn3
  • outer conductor radius : 70 cm  65.5 cm
  • B-field region (Z-length) : 250 cm  247.1 cm
  • Muonflux@MUMON decreased by 3%, profile shape is same
  • geometry updateneutrino flux 09bnewless than 5% difference upto 5GeVnm@SKFar/NearParents of muons in muon pit-pions-Horn off1st Horn 273kAAll horns 320kAH.Kubo. K.MatsuokaK. MatsuokaProton information
  • Store primary beam information in a common block and MUMON or neutrino ntuple.
  • libneubeam/
  • integer gipart : Primary generated particle ID
  • real gpos0(3) : Generation point
  • common /gbeam/gipart, gpos0
  • Accumulate POT w/ a flat proton beam.
  • Weight the muon profile w/ an arbitrary proton profile by using gpos0.
  • We do not need to make many MC data sets of various proton beam profile.
  • H.Kubonew ND flux calculation algorithm
  • current filling routine
  • SK : treated as a “point”.
  • generated neutrino is always filled acceptance of SK for each decay is included in “norm”.
  • ND : repeat parent’s decay randomly (uniformly in CM)
  • by N times (default 1,000). only neutrinos which have proper angle are filled.
  • New method : fill ND ntuple just the same method as one of SK.
  • choose a detection point (x, y) randomly in the ND plane
  • calculate weight (acceptance) for this direction
  • using parent 4-momentum
  • same method with SK ntuple.
  • Motivation
  • In the current version, high-energy pions are multiply used. Events are not independent. Simple error couting results in underestimate.
  • Status
  • Coding is almost done. Under check.
  • issues towards Dec.(Jan.) mass production
  • Received requests from ND280 beam group
  • Received a request from Hiro
  • To check new ND280 algorithm, want flux in both old and new algorithm
  • Need to be done
  • final(?) check of new ND algorithm
  • final(?) check of mag. field inside conductor
  • correct ND280 position
  • Optimization of proton beam area
  • two flat area?
  • check of Nicolas commitment and decide which should be stored for mass production version
  • Random seed control?
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