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A scheme with two superconducting RF cavities (sc-cavities) is designed toupgrade electron storage rings with odd buckets into multi-length bunches. Inthis paper, Hefei Light Source II (HLS II) is given as an example for oddbuckets. In accordance with 45 buckets, which is multiples of 3, threedifferent length of bunches generated simultaneously is proposed in thepresently applied user optics. The final result is to, without low-alphaoptics, fill HLS II with long bunches of 50 ps length, medium bunches of 23 psand short bunches of 6 ps. Each third buckets can be filled with short bunches,of which the current limit is up to 6.6 mA, more than 60 times the value oflow-alpha mode. Moreover, particles tracking about beam dynamics performed byELEGANT and calculations about beam instabilities are presented in this paper.

A Multi-length Bunches Design for Electron Storage Rings with Odd Buckets