The Use of Photon ttenuation Coefficents in the Calculation of光子衰减系数计算中的应用.pptVIP

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The Use of Photon ttenuation Coefficents in the Calculation of光子衰减系数计算中的应用.ppt

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The Use of Photon ttenuation Coefficents in the Calculation of光子衰减系数计算中的应用

Project Summary Use radioactive sources to carry out RPC efficiency studies as a function of the background rate. Use 55Fe that emits photons of energy (5.6 keV) so that the # of electron-ion pairs generated is comparable to the # of electrons freed when a minimum ionizing particle (e.g. a muon) passes through the RPC gas gap. Study background rates between 10Hz/cm2 and 2-3kHz/cm2(CMS maximum). Number of sources, distance from RPC, and strength are variable. Use toy Monte Carlo to determine source configuration-sources will be custom made Need mean free path for photons in RPC gas as input to the Monte Carlo Possible Source Configuration Monte Carlo Simulation MC software available to calculate rates for 1 source (Dave Layton) Parameters Absorption length Dimensions of RPC Source strength Source position Use code to optimize number of sources, locations, strengths (ongoing). Absorption Length Calculation The Shortest Path Issues: The specific energy you desire may not be tabulated and you may desire a more time effective route to the solution. Solution: Use NIST XCOM /PhysRefData/Xcom/Text/XCOM.html. a program that uses the above procedure to calculate photon attenuation coefficients(even at rarely tabulated energy values). The total photon attenuation coefficient is defined as the sum of contributions from incoherent(Compton) scattering, coherent (Thompson) scattering, photoelectric absorption, and pair production. The main contribution @5.6keV comes from photoelectric absorption. Mean Free Path in RPC Gas * * Nathan Sparks,ACU/UIUC HEPG Purpose: To determine the rate capability of prototype RPC’s in a PHENIX like environment The Use of Photon Attenuation Coefficients in Calculating the Photon Absorption Length in an RPC Gas Mix Nathan Sparks,ACU/UIUC HEPG Nathan Sparks,ACU/UIUC HEPG Nathan Sparks,ACU/UIUC HEPG Nathan Sparks,ACU/UIUC HEPG Gas mixture: 95% R-134A, 4.5% I-Butane, 0.5% SF6 Long Way …Look up: Photon attenuation coefficients