P.-R. KettleMEG-Review July 20041 MEG Beam Line Studies E5 Z-Branch Collaborative Effort !!! Effort…

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P.-R. KettleMEG-Review July Beam Line Overview Beam Line Objectives Couple ‘Z’-Branch elements in shielding to the detector i.e. COBRACouple ‘Z’-Branch elements in shielding to the detector i.e. COBRA Stop maximum number of μ + in thinnest target with minimal background contaminationStop maximum number of μ + in thinnest target with minimal background contamination  No Iron allowed in vicinity COBRA → Solenoid coupling  28 MeV/c surface μ + beam with high transmission efficiency → Rate  Reject beam e + background e + /μ + ~ 10 →Wien Filter  Small beam spot size at target in COBRA → careful optics + collimator system + solenoid  Thin slanted target min. thickness for  → 37 mg/cm 2 CH 2 Tg at 22  + degrader system → 37 mg/cm 2 CH 2 Tg at 22  + degrader system Beam Line Objectives Couple ‘Z’-Branch elements in shielding to the detector i.e. COBRACouple ‘Z’-Branch elements in shielding to the detector i.e. COBRA Stop maximum number of μ + in thinnest target with minimal background contaminationStop maximum number of μ + in thinnest target with minimal background contamination  No Iron allowed in vicinity COBRA → Solenoid coupling  28 MeV/c surface μ + beam with high transmission efficiency → Rate  Reject beam e + background e + /μ + ~ 10 →Wien Filter  Small beam spot size at target in COBRA → careful optics + collimator system + solenoid  Thin slanted target min. thickness for  → 37 mg/cm 2 CH 2 Tg at 22  + degrader system → 37 mg/cm 2 CH 2 Tg at 22  + degrader system  E5 Area