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Title |
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| TUAY01 |
Overview of proton driver studies for neutrino and muon factories
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64 |
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- W. Chou
Fermilab, Batavia, Illinois
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There are a number of proton driver studies around the world: SPL at CERN, an 8 GeV SCRF linac at Fermilab, AGS upgrade at BNL, Proton Driver for the International Scoping Study on Neutrino Factories and Superbeams, FFAG based proton driver in Japan, etc. This talk will give an overview of them and compare their similarities and differences. Common R&D projects and possible inter-laboratory collaborations will be discussed.
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| TUAY02 |
End-to-end beam dynamics for CERN Linac4
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79 |
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- A. M. Lombardi, G. Bellodi, J.-B. Lallement, S. Lanzone, E. Zh. Sargsyan
CERN, Geneva
- M. A. Baylac
LPSC, Grenoble
- R. Duperrier, D. Uriot
CEA, Gif-sur-Yvette
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LINAC 4 is a normal conducting H- linac which aims to intensify the proton flux available for the CERN accelerator complex. This injector is designed to accelerate a 65 mA beam of H- ions up to 160 MeV for injection into the CERN Proton Synchrotron Booster. The acceleration is done in three stages : up to 3 MeV with a Radio Frequency Quadrupole (the IPHI RFQ) operating at at 352 MHz, then continued to 90 MeV with drift-tube structures at 352 MHz (conventional Alvarez and Cell Coupled Drift Tube Linac) and, finally, with a Side Coupled Linac at 700MHz. The accelerator is completed by a chopper line at 3 MeV and a transport and matching line to the PS booster. After the overall layout was determined based on general consideration of beam dynamics and RF, a global optimisation based on end-to-end simulation has refined some design choices. The results and lessons learned from the end-to-end simulations are reported in this paper.
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| TUAY03 |
Design of the Driver Linac for the Rare Isotope Accelerator
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89 |
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- P. N. Ostroumov, J. A. Nolen, K. W. Shepard
ANL, Argonne, Illinois
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The proposed design of the Rare Isotope Accelerator (RIA) driver linac is based on cw fully superconducting 1.4 GV linac capable to accelerate uranium ions up to 400 MeV/u and protons to 1 GeV with 400 kW beam power. Extensive research and development effort has resolved many technical issues related to the construction of the driver linac and other systems of the RIA facility. Particularly, newly developed high-performance SC cavities will provide the required voltage for the driver linac using 300 cavities designed for six different geometrical betas. We are currently looking at alternatives for staging the facility to reduce the initial cost by about a factor of two. A possibility for the first stage includes ~850 MV driver linac to deliver uranium beams at 200 MeV/u and protons at 550 MeV. Thanks to successful tests of the front end systems, 400 kW beams can be obtained with increased intensities of heavy-ion beams from the ECR and higher rf power in the linac even at the first stage of the facility.
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| TUAY04 |
Beam Dynamics Design of the PEFP 100 MeV Linac
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99 |
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- J.-H. Jang, Y.-S. Cho, K. Y. Kim, Y.-H. Kim, H.-J. Kwon
KAERI, Daejon
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The Proton Engineering Frontier Project (PEFP) is constructing a 100 MeV proton linac in order to provide 20 MeV and 100 MeV proton beams. The linac consists of a 50 keV proton injector including an ion source and a low energy beam transport (LEBT), a 3 MeV radio-frequency quadrupole (RFQ), a 20 MeV drift tube linac (DTL), a medium energy beam transport (MEBT), and the higher energy part (20 MeV ~ 100 MeV) of the 100 MeV DTL. The MEBT is located after the 20 MeV DTL to extract 20 MeV proton beams. The 20 MeV part of the linac was completed and is now under beam test. The higher energy part of the PEFP linac was designed to operate with 8% beam duty. This brief report discusses the design of the PEFP 100MeV linac as well as the MEBT.
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| TUAY05 |
Application of the extreme value theory to estimate beam loss in an ion linac, using large scale Monte Carlo simulations
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107 |
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- R. Duperrier, D. Uriot
CEA, Gif-sur-Yvette
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The influence of random perturbations of high intensity accelerator elements on the beam losses is considered. This paper presents the error sensitivity study which has been performed for the SPIRAL2 linac in order to define the tolerances for the construction. The proposed driver aims to accelerate a 5 mA deuteron beam up to 20 A. MeV and a 1 mA ion beam for q/A = 1/3 up to 14.5 A. MeV. It consists in an injector (two ECRs sources + LEBTs with the possibility to inject from several sources + Radio Frequency Quadrupole) followed by a superconducting section based on an array of independently phased cavities where the transverse focalization is performed with warm quadrupoles. The correction scheme and the expected losses are described. The Extreme Value Theory is used to estimate the expected beam losses. The described method couples large scale computations to obtain probability distribution functions. The bootstrap technique is used to provide confidence intervals associated to the beam loss predictions. With such a method, it is possible to measure the risk to loose a few watts in this high power linac (up to 200 kW).
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| TUAY06 |
Stability Issues in Superconducting Radio-Frequency Linear Accelerators
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0 |
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- M. S. Champion
ORNL, Oak Ridge, Tennessee
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Field stability in superconducting radio-frequency (RF) cavities is critical to the performance of linear accelerators. The Spallation Neutron Source (SNS) Linac requires field stability within 1% and 1 deg of amplitude and phase, respectively, whereas the proposed International Linear Collider requires field stability one to two orders of magnitude more stringent. Field stability is affected by many factors including beam loading, Lorentz-force detuning, cryogenic system pressure and temperature stability, high-voltage system stability, thermal drift in electronics and transmission lines, timing and reference system stability, vibration-induced microphonics detuning, component aging, and the stability and robustness of the low-level RF (LLRF) control system itself. The LLRF control system must compensate for all of the sources of instability through a combination of feedback and feedforward techniques. In this paper the author will discuss stability issues drawing on examples from the recently-commissioned SNS Linac. Performance measurements, some completed and some planned, will be presented along with discussion of the techniques employed to provide the required field stability.
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