Abstract
Physics opportunity in the charm and tau energy region calls for higher luminosity of the Beijing Electron-Positron Collider (BEPC). The BEPC has experienced continuous improvement since its completion in 1988. BEPCII, as a major upgrading project of the BEPC, aims at enhancing its luminosity of factor 30-100, following the principle of "one machine, two purposes" as adopted in BEPC, so that both high energy physics and synchrotron radiation experiments can be carried out with BEPCII. From the BEPC to BEPCII, the double-ring scheme with multi-bunch e(+)-e(-) collision in the large crossing angle was studied in comparison with the single-ring pretzel scheme. For the dedicated synchrotron radiation operation, artful "bridges" are designed to connect two halves of the outer ring in both the southern and the northern crossing regions. This paper reviews the studies on the BEPC upgrade from pretzel to double-ring structure of BEPCII.
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