Loss Mechanism and Lifetime of Ion Beam in HIRFL-CSRe

Key words: 
• HIRFL-CSRe /
• ion beam /
• beam lifetime

Abstract: The loss mechanism and lifetime of ion beams in collisions with residual gas, internal target and electrons in ecooler in heavy ion cooler storage rings were studied. The partial beam lifetimes resulting from various loss mechanisms and the total beam lifetimes of 50—500 MeV/u¹²C⁶⁺, ³⁶Ar¹⁸⁺, ¹³²Xe⁵⁴⁺ and ²³⁸U⁹²⁺ stored in the experimental ring of the Cooler Storage Ring at the Heavy Ion Research Facility in Lanzhou (HIRFLCSR) were calculated. The calculations indicate that the charge exchange process between ion beams and the internal target, as well as the radiative recombination process with the electrons in ecooler restrict the beam lifetime considerably. For heavy ion beams such as ¹³²Xe⁵⁴⁺ and ²³⁸U⁹²⁺, the radiative recombination is the dominant loss mechanism