Abstract
We recently created a snake depolarizing resonance using an rf solenoid magnet in a ring containing a nearly 100 % Siberian snake. We found that the primary snake rf resonance also had two weaker synchrotron sidebands, which are second-order snake resonances; they were probably caused by the energy-dependent strength of the solenoid snake due to the Lorentz contraction of its longitudinal / Bdl. This was the first observation of an rf synchrotron-sideband depolarizing resonance in the presence
Highlights
In order to accelerate a polarized proton beam at veryhigh-energy facilities, such as RHIC [1], HERA [2], and Fermilab [3], one must overcome many first-order and higher-order spin depolarizing resonances
We found that the primary snake rf resonance had two weaker synchrotron sidebands, which are second-order snake resonances; they were probably caused by the eRnergy-dependent strength of the solenoid snake due to the Lorentz contraction of its longitudinal B ? dl
Even with a full Siberian snake in a ring, an rf magnetic field from either a solenoid or dipole magnet can induce an rf depolarizing resonance [5], which is sometimes called a snake resonance, because it would not exist at its frequency without a Siberian snake
Summary
In order to accelerate a polarized proton beam at veryhigh-energy facilities, such as RHIC [1], HERA [2], and Fermilab [3], one must overcome many first-order and higher-order spin depolarizing resonances. H. Sato KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan (Received 18 February 1999; published 10 June 1999) We recently created a snake depolarizing resonance using an rf solenoid magnet in a ring containing a nearly 100% Siberian snake. We found that the primary snake rf resonance had two weaker synchrotron sidebands, which are second-order snake resonances; they were probably caused by the eRnergy-dependent strength of the solenoid snake due to the Lorentz contraction of its longitudinal B ?
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