WEB — WGB - Beam Dynamics in Linacs (06-Oct-21 10:00—11:00)
Paper
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WEBC1
Envelope Instabilities and Their Mitigation in High Intensity Hadron Beams
J. Qiang
LBNL, Berkeley, California, USA
The envelope instabilities driven by space-charge effects in high intensity hadron beams can cause beam emittance growth, size blow up and potential particle loss inside an accelerator. In this talk, we will discuss about the mechanism of the envelope instabilities, the parameters that result in the envelope instabilities, and potential methods to mitigate these instabilities.
H-minus and Light-Ion Linacs Upgrade Plan for Production of Critical Isotopes at BNL
D. Raparia
BNL, Upton, New York, USA
To increase medical isotopes production at BNL, an energy upgrade to existing 200 MeV H⁻ linac and new light ion linac to accelerate light ions (m/q ~ 2.3) is proposed. H⁻ beam from the BLIP beam line will be diverted to existing radiation effect facility (REF) tunnel. The final energy of 600 MeV for H⁻ can be achieved by installing couple cavity linac (CCL) in the REF and Neutral Beam Time of Flight (NBTF) tunnel. The add on accelerator can provide beam of 200 to 600 MeV on the target with the maximum beam power of 120 kW. The Light ion linac tunnel will be built parallel to the NBTF tunnel with the same target building as H⁻ target building. The light ion linac will accelerate light ion (m/q ~ 2.3 ) to 60 MeV/amu with 200 micro-appear of average current.
A. Gatera, J. Belmans, S. Boussa, F. Davin, W. De Cock, V.R.A. De florio, F. Doucet, L. Parez, F. Pompon, A. Ponton, D. Vandeplassche, E. Verhagen
SCK•CEN, Mol, Belgium
Dr. Ben Abdillah, C. Joly, L. Perrot
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
F. Bouly, E. Froidefond, A. Plaçais
LPSC, Grenoble Cedex, France
H. Podlech
IAP, Frankfurt am Main, Germany
J. Tamura
JAEA/J-PARC, Tokai-mura, Japan
C. Zhang
GSI, Darmstadt, Germany
The MYRRHA project at SCK•CEN, Belgium, aims at coupling a 600 MeV proton accelerator to a subcritical fission core operating at a thermal power of 60 MW. The nominal proton beam for this ADS has an intensity of 4 mA and is delivered in a quasi-CW mode. MYRRHA’s linac is designed to be fault tolerant thanks to redundancy implemented in parallel at low energy and serially in the superconducting linac. Phase 1 of the project, named MINERVA, will realise a 100 MeV, 4 mA superconducting linac with the mission of demonstrating the ADS requirements in terms of reliability and of fault tolerance. As part of the reliability optimisation program the integrated prototyping of the MINERVA injector is ongoing at SCK•CEN in Louvain-la-Neuve, Belgium. The injector test stand aims at testing sequentially all the elements composing the front-end of the injector. This contribution will highlight the beam dynamics choices in MINERVA’s injector and their impact on ongoing commissioning activities. *angelique.gatera@sckcen.be
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A.K. Orduz, R. Ferdinand, J.-M. Lagniel, G. Normand
GANIL, Caen, France
D.U. Uriot
CEA-DRF-IRFU, France
Commissioning of the SPIRAL2 linac began as soon as the French Nuclear Safety Authority authorisation was obtained on 8 July 2019, first with the settings of the medium energy line MEBT (between the RFQ and the linac, including the tuning of the bunch selector), then with the linac settings. The settings of the MEBT, linac and high-energy lines (HEBT) to the beam dump and to the Neutron For Science (NFS) experiment room were validated during the two six-month commissioning periods. Stable operation with a 16 kW proton beam (10% of the nominal) has been achieved, showing that the conditions are already met (beam loss control) to be able to operate at maximal power (160 kW proton, 200 kW deuteron). The various stages of commissioning and the results obtained are presented.
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