Modeling of Scintillating Fiber Detector in Muon Cooling

Modeling of Scintillating Fiber Detector in Muon Cooling System Summer student meeting September 5, 2007 A. Uuemaa, Novosibirsk State University Supervisor: Andreas Jansson, APC-MCTF Exp Dept.

Muon Collider: goals, advantages, problems § Goals Ø Observation of Higgs, Ø Neutrino factories ~1020 neutrino/year § Advantages Ø Collisions are cleaner and well-define Ø Sizes are smaller § Problems Ø Short lifetime ~2. 2 s Ø Large emittance 2

Cooling and Simulation § To cool short-living muons the Ionization Cooling is needed § Helical 6 -D Cooling Ø Magnetic field is solenoid B 0+ dipole + quad +… Ø System is filled with LHe, includes RF cavities Ø Cools 6 -D (large E means longer path length) 1. Muon cooling simulation is provided by G 4 Beam. Line 1. Simulates magnetic fields configuration 2. Implements “virtual” detectors to track the particles 3

Detection § Muon beam detection is provided by Fiber Profile Monitor Scintillating Fiber Tracker Multi-anode PMT • • • Muon beam goes through the scintillating fibers and produces photons Photons produce electrons in PMT Orientation of fibers can be changed by rotation around Z 4

Personal Task • Write C++ program modeling the real PMT detector • To test this program and write the documentation 5

How the program works § Reads the initial data from G 4 BL output file and configuration files § Simulates the photons production in each fiber Ø Counts muon path length L through the fibers Ø Generates random value (number of photons) distributed with • Poisson with λ = const · L (const = 6. 7 photon/mm) § Simulates the electrons production in PMT Ø Generates random value (number of electrons multiplied in PMT) distributed with • Exponential or Gaussian § Forms the output data Ø Data Table Ø Makes a histogram (spatial muon beam distribution) for each detector 6

Conclusions § Program is written and successfully tested § Future goals: Ø To check different compilers compatibility Ø To write a documentation Ø To simulate the real experiment measurements 7