LEAR中氧离子的随机冷却和贮存试验

Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology Pub Date : 1989-03-20 DOI:10.1109/PAC.1989.73209

S. Baird, J. Bosser, M. Chanel, C. Hill, D. Kramer, R. Ley, D. Manglunki, D. Mohl, P. Têtu, G. Tranquille

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引用次数: 2

摘要

O/sup 8+/和O/sup 6+/离子在CERN低能反质子环(LEAR)中进行了一次机器实验。目的是获得在良好的冷却环真空中重离子束寿命的一些提示，并测试离子的冷却和堆叠。由于残余气体的多次散射对光束的衰减是影响寿命最重要的因素，因此采用了随机冷却来补偿。测量到的平衡动量扩散小于5*10/sup -4/，从而证明了随机冷却对多电荷离子的效率。在LEAR的真空条件下(2.6*10/sup -12/ torr计读数，剩余气体为90% H/ sub2 /)，测得的光束寿命为O/sup 6+/在7.2 MeV/u时为25分钟，O/sup 8+/在11.5 MeV/u时为600分钟。这些数字为低能离子储存环设定了有利的限制。

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Stochastic cooling and storage tests with oxygen ions in LEAR

O/sup 8+/ and O/sup 6+/ ions were stored in the CERN Low-Energy Antiproton Ring (LEAR) during a machine experiment session. The aim was to obtain some hints on the lifetime of heavy ion beams in a good cooling ring vacuum and to test cooling and stacking of ions. Stochastic cooling was used to compensate the beam decay due to multiple scattering on the residual gas, which is the most important effect on lifetime. An equilibrium momentum spread of less than 5*10/sup -4/ was measured, thus proving the efficiency of stochastic cooling for multiply charged ions. With the vacuum conditions of LEAR (2.6*10/sup -12/ torr gauge reading with a residual gas of 90% H/sub 2/), measured beam lifetimes are 25 min for O/sup 6+/ at 7.2 MeV/u and 600 min for O/sup 8+/ at 11.5 MeV/u. These numbers set favorable limits for low-energy ion storage rings.<>

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来源期刊

Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology

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