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The time structure of the accelerated H- beam of Moscow meson factory is defined by technical features of linear acceleration and inadequate to the demands of a considerable part of the physics program envisaged. A new type of a magnetic ring for ion pulse time structure transformation is proposed. The most essential operating modes are as follows: 1) the compression of every stored pulse up to the hundreds times; 2) slow ejection of every pulse over 10 ms. Multiturn chargechanging H-Â¿ H+ injection will be used for the effective storage. The magnetic ring is an isochronous one (r=-rtr) for the pulse compression mode. Bunch beam structure is maintained without RF bunching system. The beam will be slowly ejected by the modified Piccioni method. The 99% ejection efficiency can be achieved, but the special azimutal distribution of a dispersion function is needed. The main beam dynamics features are shown together with the magnet ring configuration.