description
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