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We consider particle acceleration at the scatter-free limit in quasi-planar shock waves propagating in inhomogeneous magnetic fields. It is shown that both non-constant magnetic field intensity and field-line curvature may lead to efficient acceleration of particles at shocks propagating through the structure. Shocks propagating towards increasing magnetic field intensity trap energetic particles, and as the field increases at the shock front the particles, by conserving their magnetic moment µdoi:10.1051/0004-6361:20054754 fatcat:i37fk34wvng6tihv6sf2mkxwbe