Mustapha, B. Erdelyi, B. Ostroumov, P.N. JACoW Geneva, Switzerland 978-3-95450-180-9 10.18429/JACoW-NAPAC2016-TUPOB04 English 483-485 TUPOB04 ion booster injection dipole linac Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-NAPAC2016-TUPOB04 https://jacow.org/napac2016/papers/tupob04.pdf The original design of the JLEIC pre-booster was a 3-GeV figure-8 shaped synchrotron with a circumference of about 240 m. In the current baseline design, the 3-GeV pre-booster was converted into an 8-GeV booster of the same shape and size but using super-ferric magnets with fields up to 3 Tesla. In order to limit the foot-print of the JLEIC ion complex and reduce its total cost, we have designed a more compact and cost-effective octagonal 3-GeV ring about half the size of the original one. At 3 GeV, the figure-8 shape is not required to preserve ion polarization; Siberian snakes with reasonable magnetic fields can be used for spin correction. As the ion collider ring requires an injection energy of at least 8 GeV, we propose to use the existing electron storage ring, which is part of the electron complex, as a large booster for the ions up to 11 GeV. The design optimization of the pre-booster ring will be presented leading to the final octagonal ring design. Preliminary beam simulations will also be presented and discussed.