Localization of the large-angle foil-scattering beam loss caused by the multiturn charge-exchange injection

Kato, Shinichi; Yamamoto, Kazami; Yoshimoto, Masahiro; Harada, Hiroyuki; Kinsho, Michikazu

doi:10.1103/physrevstab.16.071003

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…The CEI system followed by the collimation system are placed at the 1st straight section. The extracted beam is simultaneously delivered to the MLF and MR. kept to only 7, but similar to other facilities the residual radiation at the injection area caused by the foil scattering beam losses is very high even at a lower beam power [4,8,9,10,11,12]. To further reduce the foil scattering beam losses, recently we have minimized the injection beam size and implemented a smaller size foil.…”

Section: Introductionmentioning

confidence: 89%

High Intensity Beam Operation of J-PARC RCS With Minimum Beam Loss

Saha,

Harada,

Shobuda

et al. 2024

J. Phys.: Conf. Ser.

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The 3-GeV RCS (Rapid Cycling Synchrotron) of J-PARC (Japan Proton Accelerator Research Complex) at present operates at a high intensity beam near to 1 MW beam power. The beam loss and the corresponding residual radiation are key issues for beam intensity ramp up. Based on detail numerical simulations and systematic beam studies the beam loss has been well mitigated to a minimum level. The residual beam loss at 1 MW beam power is mostly due to unavoidable foil scattering of the circulating beam during injection. We have identified almost all major beam loss sources and optimized to minimize the beam loss for achieving a stable operation at 800 kW beam power since April 2022.

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Section: Introductionmentioning

confidence: 89%

High Intensity Beam Operation of J-PARC RCS With Minimum Beam Loss

Saha,

Harada,

Shobuda

et al. 2024

J. Phys.: Conf. Ser.

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“…Thus, an additional collimation system was installed between the foil and the collimators. By this new collimator, the loss caused by foil scattering decreased to <20% [16,17].…”

Section: Distribution Of the Losses Around The Ringmentioning

confidence: 99%

Performance of the beam collimation system in the J-PARC RCS

Yamamoto¹,

Kato

Harada³

et al. 2014

Progress in Nuclear Science and Technology

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The most important issue in a high intensity proton accelerator is to keep the accelerator tunnel in a hands-on-maintenance condition. A collimation system was designed and installed in 3GeV Rapid Cycling Synchrotron (RCS) at the Japan Proton Accelerator Research Complex (J-PARC) to be localized the beam loss point to a restricted area. The experimental results indicated that the RCS collimation system performs well enough such that nearly all the ring components are maintained in good condition. However, as the beam power increased, unexpected losses downstream of the injection foil increased. Therefore, an additional collimator was installed that successfully reduced such unexpected losses.

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“…Third, we installed an additional collimator in the thick shielding wall at the branch in parallel with the recovery work from the earthquake. As a result, the loss caused by foil scattering decreased to <20% [13,14].…”

Section: Loss At the Branch Duct Between The Circulating Beam And Unementioning

confidence: 99%

Beam power and residual dose history of J-PARC RCS

Yamamoto¹,

Hotchi²,

Harada³

et al. 2014

Progress in Nuclear Science and Technology

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A 3 GeV rapid cycling synchrotron (RCS) at J-PARC was commissioned in October 2007. Afterwards, the beam intensity was increased through a beam study, and the RCS has continuously provided a proton beam >100 kW to the neutron target since October 2009. With renewed efforts brought about by beam commissioning, we have reduced losses in the RCS and achieved low-loss operation. We present the history of the operational beam power and the residual dose distributions after operation.

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Localization of the large-angle foil-scattering beam loss caused by the multiturn charge-exchange injection

Cited by 9 publications

References 5 publications

High Intensity Beam Operation of J-PARC RCS With Minimum Beam Loss

High Intensity Beam Operation of J-PARC RCS With Minimum Beam Loss

Performance of the beam collimation system in the J-PARC RCS

Beam power and residual dose history of J-PARC RCS

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