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In accelerator physics, rigidity is a concept used to determine the effect of particular magnetic fields on the motion of the charged particles. It is a measure of the momentum of the particle, and it refers to the fact that a higher momentum particle will have a higher resistance to deflection by a magnetic field. It is defined as ''R'' = ''Bρ'' = ''p''/''q'', where ''B'' is the magnetic field, ''ρ'' is the gyroradius of the particle due to this field, ''p'' is the particle momentum, and ''q'' is its charge. It is frequently referred to as simply "''Bρ''".〔 〕 It is important to note that the rigidity is defined by the action of a static magnetic field, whose direction is perpendicular to the velocity vector of the particle. This will cause a force perpendicular both to the velocity vector, and to the field, defining a plane through which the particle moves. The definition of the Lorentz force implies that the particle's motion will be circular in a uniform field, thus giving a constant radius of curvature. If the particle momentum, ''p'', is given in GeV/''c'', then the rigidity, in tesla-metres, is ''Bρ'' = 3.3356''p''/''q''. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rigidity (electromagnetism)」の詳細全文を読む スポンサード リンク
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