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WEP2PO033 |
A Test of Stripper Foil Lifetime in PSI's 72 MeV Proton Beam |
radiation, cyclotron, beam-losses, TRIUMF |
338 |
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- R. Dölling, R. Dressler
PSI, Villigen PSI, Switzerland
- L. Calabretta
INFN/LNS, Catania, Italy
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A test of the lifetime of an amorphous carbon foil of ~79 ug/cm2 was performed at PSI in the transfer line between Injector 2 and Ring cyclotron during the regularly beam production. The 72 MeV ~1.7 mA proton beam had a central current density of ~2.8 mA/cm2. Two spots on the foil were irradiated alternatively with in total three fractions of 17, 52 and 119 mAh. Foil thickness was measured before and after irradiation at several positions via the energy loss of alpha-particles from a 241Am source in the foil. We discuss the observed foil damage as well as the experimental setup, the estimation of the beam parameters and practical boundary conditions.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO033
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THA1WE04 |
ESS nBLM: Beam Loss Monitors based on Fast Neutron Detection |
neutron, linac, proton, photon |
404 |
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- T. Papaevangelou
CEA/IRFU, Gif-sur-Yvette, France
- H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, T. Bey, B. Bolzon, N. Chauvin, M. Combet, D. Desforge, M. Desmons, Y. Gauthier, E. Giner-Demange, A. Gomes, F. Gougnaud, F. Harrault, F. J. Iguaz Gutierrez, T.J. Joannem, M. Kebbiri, C. Lahonde-Hamdoun, P. Le Bourlout, Ph. Legou, O. Maillard, A. Marcel, C. Marchand, Y. Mariette, J. Marroncle, V. Nadot, M. Oublaid, G. Perreu, O. Piquet, B. Pottin, Y. Sauce, J. Schwindling, L. Segui, F. Senée, R. Touzery, G. Tsiledakis, O. Tuske, D. Uriot
IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France
- I. Dolenc Kittelmann, R.J. Hall-Wilton, C. Höglund, L. Robinson, T.J. Shea, P. Svensson
ESS, Lund, Sweden
- V. Gressier
IRSN, Saint-Paul-Lez-Durance, France
- K. Nikolopoulos
Birmingham University, Birmingham, United Kingdom
- M. Pomorski
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
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A new type of Beam Loss Monitor (BLM) system is being developed for use in the European Spallation Source (ESS) linac, primarily aiming to cover the low energy part (proton energies between 3-100 MeV). In this region of the linac, typical BLM detectors based on charged particle detection (i.e. Ionization Cham-bers) are not appropriate because the expected particle fields will be dominated by neutrons and photons. Another issue is the photon background due to the RF cavities, which is mainly due to field emission from the electrons from the cavity walls, resulting in brems-strahlung photons. The idea for the ESS neutron sensi-tive BLM system (ESS nBLM) is to use Micromegas detectors specially designed to be sensitive to fast neutrons and insensitive to low energy photons (X and gammas). In addition, the detectors must be insensitive to thermal neutrons, because those neutrons may not be directly correlated to beam losses. The appropriate configuration of the Micromegas operating conditions will allow excellent timing, intrinsic photon back-ground suppression and individual neutron counting, extending thus the dynamic range to very low particle fluxes.
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Slides THA1WE04 [3.267 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-HB2018-THA1WE04
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THA2WE02 |
Application of Machine Learning for the IPM-Based Profile Reconstruction |
electron, network, space-charge, simulation |
410 |
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- M. Sapinski, R. Singh, D.M. Vilsmeier
GSI, Darmstadt, Germany
- J.W. Storey
CERN, Geneva, Switzerland
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One of the most reliable devices to measure the transverse beam profile in hadron machines is Ionization Profile Monitor (IPM). This type of monitor can work in two modes: collecting electrons or ions. Typically, for lower intensity beams, the ions produced by ionization of the rest gas are extracted towards a position-sensitive detector. Ion trajectories follow the external electric field lines, however the field of the beam itself also affects their movement leading to a deformation of the observed beam profile. Correction methods for this case are known. For high brightness beams, IPM configuration in which electrons are measured, is typically used. In such mode, an external magnetic field is often applied in order to confine the transverse movement of electrons. However, for extreme beams, the distortion of the measured beam profile can still be present. The dynamics of electron movement is more complex than in case of ions, therefore the correction of the profile distortion is more difficult. Investigation of this problem using a dedicated simulation tool and machine learning algorithms lead to a beam profile correction methods for electron-collecting IPMs.
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Slides THA2WE02 [7.357 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-HB2018-THA2WE02
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