Welcome! to the 22nd International Conference on the Application of Accelerators in Research and Industry (CAARI 2012) August 5 – 10, 2012 Renaissance Worthington Hotel Fort Worth, Texas USA Contact Details Holly Decker Phone: +1-940-565-3256 Conference Secretary Fax: +1-940-565-2227 University of North Texas 1155 Union Circle, # 311427 E-mail: [email protected] Denton, Texas 76203-5017 USA Web: www.caari.com 1 Using this Abstract Book Please, use the “find” field at the top of the pdf document to search for a single abstract or all the abstracts in a particular session. You can also search this entire document for words in the abstracts that relate to your areas of interest. This listing contains information about each presentation including all of the authors and their affiliations. If one wants to find out when Barney Doyle’s talk is to be given, just look up his name in the index at the end of this book: Doyle, Barney L. MON-AT03-1 Then go to the “PRESENTATIONS” listing to find MON (i.e. the Monday presentations) AT03 (the session codes are listed alphabetical, in this case AT is Accelerator Technology) 1 (the first talk of this session) The details in this PRESENTATION listing includes the Presentation Number: #82 The type of presentation: Invited Talk The day and time Session AT01 starts: Monday 1:00 PM The location: The Bur Oak room 2 TABLE OF CONTENTS Page No. Monday Abstracts 5 Tuesday Abstracts 55 Wednesday Abstracts 125 Thursday Abstracts 188 Friday Abstracts 221 Author Index 223 3 ABSTRACTS PLENARY, INVITED, CONTRIBUTED TALKS AND POSTERS In Order by Day of the Week 4 MONDAY 5 MON-AP01-1 #313 - Invited Talk - Monday 1:00 PM - Elm Fork Modeling X-ray Emission due to Charge Exchange Phillip C. Stancil Department of Physics and Astronomy, University of Georgia, Athens GA 30602, United States Since the advent of Cravens' [1] proposal that the observed X-ray emission from comet Hyakutake was due to charge exchange (CX) of highly-charged solar wind ions with cometary neutrals, the CX mechanism has been identified as a possible dominant contributor to the X-ray emission observed in the heliosphere, planetary exospheres, the geocorona, supernova remnants, starburst galaxies, and molecular cooling flows in galaxy clusters. To provide reliable CX-induced X- ray spectra models to simulate these and other astrophysical environments, we have undertaken a project to compute quantum-state-resolved CX cross sections of highly-charged ions colliding with H and He. Here we summarize current results for C(5-6)+, N6+, and O(6-8)+ obtained with the molecular-orbital close coupling (CC), atomic-orbital CC, and classical trajectory Monte Carlo methods. Utilizing the theoretical CX cross sections, cascade models are computed to generate X- ray spectra and compared to available measurements and observations. Comparison is also made to models assuming excitation by thermal electrons to identify diagnostics to distinguish CX-induced and electron-impact-induced X-ray emission. [1] T. E. Cravens, Geophys. Res. Lett. 25, 105 (1997). This work was partially supported by NASA grant NNX09AV46G. Work performed in collaboration with Y. Wu, J. L. Nolte, D. R. Schultz, Y. Hui, M. Rakovic, H. P. Liebermann, and R. J. Buenker. MON-AP01-2 #447 - Invited Talk - Monday 1:00 PM - Elm Fork Fragmentation dynamics of complex molecules and their clusters Patrick Rousseau1, Sylvain Maclot1, Michael Capron1, Rémi Maisonny1, Elie Lattouf1, Alicja Domaracka2, Alain Méry1, Jean-Christophe Poully1, Jimmy Rangama2, Jean-Yves Chesnel1, Ann IS Holm3, Henning Zettergren3, Henrik AB Johansson3, Fabien Seitz3, Stefan Rosen3, Henning Schmidt3, Henrik Cederquist3, Bernd A Huber4, Lamri Adoui1 (1)Université de Caen Basse-Normandie , CIMAP, Bd Henri Becquerel , Caen F-14070 , France (2)CNRS , CIMAP, Bd Henri Becquerel , Caen F-14070 , France (3)Dpt of Physics , Atomic Physics, Stockholm University , Alba Nova University Ctr , Stockholm S-10691, Sweden (4)CEA, CIMAP, Bd Henri Becquerel, Caen F-14070 , France Complex molecular systems such as large molecules, clusters or nano-particles, consist of many atoms and are characterised by a large number of degrees of freedom. Energies well in excess of individual thresholds for fragmentation can be stored for long times and metastable excited states become important. We will concentrate in this talk on the study of the response of such nanoscale systems, i.e. we will study excitation and fragmentation mechanisms induced by highly charged ion (HCI) radiation, reflecting dynamic energy and charge flow processes. We will illustrate these relaxation processes for different molecular systems from Polycyclic Aromatic Hydrocarbons, water or biomolecule targets and their clusters in collision with HCI. We will emphasize that slow HCI provide an efficient way to study the stability of complex systems. Indeed, such ions are known to remove electrons at large impact parameters resulting in a fast and gentle ionisation. Moreover, in a less conventional way, HCI can also be used as a tool to form new bonds and induce the formation of even more complex molecules. 6 MON-AP01-3 #184 - Invited Talk - Monday 1:00 PM - Elm Fork Classical treatment of ionization and electron capture in water by ion impact Clara Illescas Departamento de Química, Universidad Autonoma de Madrid, Cantoblanco Universidad, Madrid 28049, Spain Ion-beam cancer therapy is a valuable alternative to conventional photon radiotherapy. In this field, collisions of water molecules by energetic ions play a very important role to the contribution of the stopping power of ions in biological tissues [1]. Moreover, ionization processes from multielectron and multicenter targets are also relevant in a broad range of disciplines such as fusion research and astrophysics. + 2+ 6+ In this work, we calculate electron production and electron capture total cross sections for H , He and C + H2O collisions in the impact energy range of 10 keV/amu < E < 10 MeV/amu. The basic assumptions of our ion-molecule CTMC (Classical Trajectoy Monte-Carlo) treatment [2] are: (i) the electrons are independent, so each electron is moving in + an effective field created by the nuclei and the remaining electrons; (ii) the interaction of the active electron with the H2O core is described by a three-center model potential, so we explicitly consider the anisotropy of the molecular target; (iii) we apply the IEVM (Independent Event Model) for evaluating the inelastic multielectron probabilities from the monoelectronic ones. In this talk, I will summarize this approach, emphasizing the description of the initial electron densities associated with the molecular orbitals of the H2O molecule and, discuss our results for ionization and electron capture. I will also illustrate the validity of the postcollisional fragmentation mechanism by comparing calculated fragmentation yields with the + available measurements for H + H2O collisions. A stringent test of our CTMC method is provided by the good agreement of the calculated emitted electron spectra with the experimental data that will be shown at the Conference. [1] D. Schardt et al., Rev. Mod. Phys. 82, 383 (2010) [2] Clara Illescas et al., Phys. Rev. A 83, 52704 (2011) MON-AP01-4 #160 - Invited Talk - Monday 1:00 PM - Elm Fork ION IMPACT INDUCED IONIZATION/FRAGMENTATION DYNAMICS OF RARE GAS DIMERS Markus S. Schoeffler1, H.K. Kim1, J. Titze1, F. Trinter1, M. Waitz1, J. Voigtsberger1, H. Sann1, M. Meckel1, C. Stuck1, U. Lenz1, D. Metz1, A. Jung1, M. Odenweller1, N. Neumann1, B. Ulrich1, R. Costa-Fraga1, N. Petridis1, S. Schoessler1, K. Ullmann-Pfleger1, R. Grisenti1, A. Czasch1, O. Jagutzki1, L. Schmidt1, T. Jahnke1, H. Schmidt-Boecking1, J. Bech1, H. Gassert1, H. Merabet2, J. Rangama3, C. L. Zhou3, A. Cassimi3, R. Doerner1 (1)Institut fuer Kernphysik, J. W. Goethe Universitaet Frankfurt, Max-von-Laue-Str. 1, Frankfurt 60438, Germany (2)Department of Mathematics, Statistics and Physic, College of Arts and Sciences, P.O. Box: 2713 , Doha, Qatar (3)CIMAP Caen, GANIL, Bd Henri Becquerel, BP 55027, Caen 14076, France Rare gas atoms can form weakly bound molecules, held together by the van-der-Vaals-force. We investigated the ionization/fragmentation-dynamics of He2 and Ne2 caused by ion impact with a COLTRIMS reaction microscope. Dependent on how electrons are removed from the dimer's atomic sites different decay pathways are open. We focus on the following two: 1.) The direct mechanism, where the projectile ionizes both atoms via 2 separate projectile-atom interactions. The dimer's constitutents have ionization properties similar to those of a single atom. Up to now, large impact parameters b, which dominate ionization are believed not to be an observable that can be measured. For large impact parameters Rutherford scattering leads to momentum transfers, that are smaller than the momenta transferred by the ejected electrons. This makes the impact parameter inaccessible through any momentum transfer measurement between the nuclei. The large internuclear distance of the dimer open a new way to access the impact parameter. The impact parameter dependent ionization probability P(b) will lead to a maximum tilt angle of the molecular axis to the ion beam up to which both atoms can be ionized. Measuring this molecular orientation allows to test the predictions of impact parameter dependence of ionization [1]. 7 2.) In addition to the direct ionization mechanism, where the dimer's atoms are subsequently ionized there is also a second mechanism, which is called the Interatomic Coulombic Decay (ICD). Predicted in 1997 [2] and in photoionization experimentally shown in 2004 [3], ICD probably plays a significant role for radiation damage in living tissue and for ion radiation therapy [4,5]. [1] Titze et al., PRL, 106, 033201, (2011) [2] Cederbaum et al., PRL, 79, 4778, (1997) [3] Jahnke et al., PRL, 93, 163401-1, (2004) [4] Boudaïffa, et al., Science 287, 1658, (2000) [5] H.-K.