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Description
The Extended EBIS will be comprised of two closely coupled RhicEBIS superconducting solenoids to provide a longer ion trap for a 40-50% intensity upgrade. The expected intensity at the Extended EBIS exit is 2.6 x 10$^9$ Au$^{32+}$/pulse and approximately 2.1 x 10$^9$ Au$^{32+}$/pulse at the Booster ring entrance. The electron optics of the gun and collector regions remains essentially the same. This is a similar approach as the previous upgrade from the TestEBIS prototype to RhicEBIS, in which the ion trap length was doubled using a longer, single solenoid. As part of the upgrade, an efficient gas injection capability will be installed to provide higher intensities of light ions. A gas injection cell will exist in the upstream solenoid with several stages of differential pumping between the adjacent trap region and the downstream solenoid. Expected intensities, based on present performance and the scaled trap length are: H$^+$~1 x10$^{12}$ ions/pulse and $^4$He$^{2+}$~5 x 10$^{11}$ ions/pulse. The design will include provisions for providing beams of polarized $^3$He$^{2+}$ during a subsequent upgrade.
