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Cavenago, M.

Paper Title Page
FR-04 Operational Experience in PIAVE-ALPI Complex 208
 
  • E. Fagotti, G. Bassato, A. Battistella, G. Bisoffi, L. Boscagli, S. Canella, D. Carlucci, M. Cavenago, F. Chiurlotto, M. Comunian, A. Facco, M. De Lazzari, A. Galatà, A. Lombardi, P. Modanese, F. Moisio, A. Pisent, M. Poggi, A.M. Porcellato, P. A. Posocco, C. Roncolato, M. Sattin, F. Scarpa, S. Stark
    INFN/LNL, Legnaro
 
 

PIAVE-ALPI is the INFN-LNL superconducting heavy ion linac, composed by an SRFQ (superconducting RFQ) section and three QWR sections for a total of 80 cavities installed and an equivalent voltage exceeding 70 MV. In the last years the SRFQ and the bulk niobium QWR came into routine operation, the medium energy QWR section was upgraded with a new Nb sputtered coating, ECR source was firstly improved by using water cooled plasma chamber and then replaced with a new one. The operation of the accelerator complex allowed acquiring a strong experience on many operational issues related to ECRIS, superconducting cavities and cryogenics, beam control and manipulation (with the new and higher accelerating gradient). The paper reports about operational experience, the present limitations and the future perspectives of the facility in view of the experimental campaign with the EU detector AGATA and of the use of PIAVE ALPI as RIB post-accelerator for SPES radioactive ion beam facility.

 

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Slides

 
A-06 ITEP Heavy Ion RFQ Output Line Upgrade for Experiments of Reactor Material Investigation under Irradiation 236
 
  • G.N. Kropachev, A. Aleev, A.D. Fertman, R.P. Kuibeda, T.V. Kulevoy, A.A. Nikitin, S.V. Rogozhkin, A.I. Semennikov
    ITEP, Moscow
  • M. Cavenago
    INFN/LNL, Legnaro
 
 

Development of new materials for future energy facilities with higher operating efficiency is a challenging and crucial task. However, full-scale testing of radiation hardness of reactor materials is quite sophisticated and difficult as it requires long session of reactor irradiation; moreover, induced radioactivity considerably complicates further investigation. Ion beam irradiation does not have such a drawback, on the contrary, it has certain advantages. One of them is high speed of defect formation. Therefore, it provides a useful tool for modeling of different radiation damages. Improved understanding of material behavior under high dose irradiation will probably allow to simulate reactor irradiation close to real conditions and to make an adequate estimation of material radiation hardness. Since 2008 in ITEP the ion beam irradiation experiments are under development at the ITEP heavy ion RFQ HIP-1. The main objectives of this work are to study primary damage, cascade formation phenomena, phase stability and self-organization under irradiation. This research is carried out by means of tomographic atom probe and transmission electron microscopy. This linac provides accelerated beams of Cu2+, Fe2+, Cr2+ ions with current up to 10 mA and energy 101 keV/n. The first experiments with ion beam at the linac injector demonstrated promising results. The linac output beam line is now under upgrade. The results of beam extraction line adjustment for experiments with reactor materials are presented. The construction of controllable heated target is presented as well.

 
E-06 High Current Ion Sources, Beam Diagnostics and Emittance Measurement 341
 
  • M. Cavenago, M. Comunian, E. Fagotti, M. Poggi
    INFN/LNL, Legnaro
  • T. Kulevoy, S. Petrenko
    ITEP, Moscow
 
 

Singly charged ion sources can easily surpass the 1 kW beam power, as in TRIPS (H+, 60 mA, 80 kV, now installed at LNL) or in NIO1 (H-, 130 mA distributed into 9 beamlets, 60 kV, a project of RFX and INFN-LNL). Beam diagnostic constitutes an important instrument in the high current source development. Even if calorimetric and optical beam profile monitors become possible, still a phase space plot of the beam will be the most useful tool for validation of extraction simulation and for input of subsequent beam transport optimization. Improvements in extraction beam simulations are briefly reported, and effect of space charge neutralization is discussed. Since preliminary design of the traditional two moving slit beam emittance meter show problems with slit deformations and tolerances and with secondary emission, an Allison scanner was chosen with the advantages: only one movement is needed; data acquisition is serial and signal can have an adequate suppression of secondary electrons. The design of a compact Allison scanner head is discussed in detail, showing: 1) the parameter optimization; 2) the segmented construction of electrodes. Experimental commissioning at lower power seems advisable.