Noise Simulation on RPCs
Andrés Leonardo Cabrera MoraHigh Energy Physics GroupUniversidad de los Andes
¿What we are simulating?
Resistive Plate Chambers
Geometry
• Polyethylene (0.2 mm)• Graphite (0.2 mm)• Bakelite (2 mm)• Gas C2H2F4 (2 mm)• Aluminum (strips)(0.04
mm)• Air• Localized Electric Field
(4.5 kV/mm)
FIRST APROXIMATION
Implementation
• Particles: photons, electrons, positrons, muons and antimuons.
• Processes: Compton Scattering, Photo Electric Effect, Gamma Conversion, Multiple Scattering, Ionization, Bremsstrahlung, Positron Annihilation and Pair Production.
• Results: Histograms, Scatter Plots, Angles Distribution and Distance Distribution.
Conditions on the Simulation
• Incidence of ten millions of muons through a Double RPC (perpendicular, fixed point)
• Localized field in the region of the gas-4.5 kV/mm in the z axis (negative)
• The results show electrons that come from photons in the gas region
RESULTS
Counts
Distance Distribution X (cm)
Electron Distance Distribution
Counts
Energy Distribution (MeV)
Electron Energy Distribution
Angular Distribution
Z (positive)
Cos (Ѳ) = 1 Cos (Ѳ) = -1
Counts
Cos (Ѳ) Distribution
Electron Cos (Ѳ) Distribution
Counts
Φ Distribution (Deg)
Electron Φ Angular Distribution
X (mm)
Y (mm)
Scatter Plot Y vs X
OTHER RESULTS
Positive Electric Field
(4.5 kV/mm en la dirección positiva del eje z)
Negative Electric Field
(4.5 kV/mm en la dirección negativa del eje z)
RPC with Iron
RPC with aluminium
Change in the incidence of particles
• Distribution of energies • Incidence from different angles and points.
Manage of Information• Twiki in english/spanish
http://twiki.org/cgi-bin/view/Sandbox/AndresCabreraSandbox
Conclusions• The incidence of ten millions of muons
produce a 0.09% (9242) of electrons that come from photons.
• Only 0.09% (9) of electrons are produced to more than 10 cm of the point of incidence.
Conclusions
• Only 2.7% (257) electrons are produced to more than 2.4 cm (1.2 cm) of the point of incidence.
Counts
Distance Distribution X (cm)
Electron Distance Distribution