Ion pulse compressor and stretcher ring for linear meson factory

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: the compression of every stored pulse up to the hundreds times; slow ejection of every pulse over 10 ms. Multiturn chargechanging H-→H+ injection will be used for the effective storage. The magnetic ring is an isochronous one (ο = ο /SUB tr/ ) 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