Abstract
The main ring (MR) at the Japan Proton Accelerator Research Complex (J-PARC) provides 30 GeV high-intensity protons to the neutrino experimental facility (NU) by fast extraction and to the hadron experimental facility (HD) by slow extraction. A stretcher ring (SR) has been proposed to ensure that the integrated proton number on target from the slow extraction is sufficient. A beam accelerated at 30 GeV in the MR is transferred to the SR and is slowly extracted over several seconds. While the slow-extraction procedure is performed, a beam can be accelerated in the MR and delivered to the NU. The arc sections of the SR consist of superconducting combined-function magnets and separated-function magnets (a hybrid lattice configuration). A 30 GeV beam transfer line from the MR to the SR uses superconducting combined magnets with dipole and quadrupole functions. The transferred beam is injected into an arc section of the SR.
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