Isochronicity Correction in the CR Storage Ring

A challenge for nuclear physics is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for measuring short-lived and very exotic nuclides. However, in a ring designed for maximal acceptance, many factors limit the resolution. One point is a limit in time resolution inversely proportional to the transverse emittance. But most of the time aberrations can be corrected and others become small for large number of turns. We show the relations of the time correction to the corresponding transverse focusing and that the main correction for large emittance corresponds directly to the chromaticity correction for transverse focusing of the beam. With the help of Monte-Carlo simulations for the full acceptance we demonstrate how to correct the revolution times so that in principle resolutions of dm/m=1E-6 can be achieved. In these calculations the influence of magnet inhomogeneities and extended fringe fields are considered and a calibration scheme also for ions with different mass-to-charge ratio is presented.Comment: 6 figures, recised version May 201

Improved final doublet parameters for the ILC 2mrad crossing angle interaction region

In this memo we present new final doublet parameters for the small crossing angle layout of the International Linear Collider. We use NbTi technology for the 500 GeV layout and Nb3 Sn technology for the 1 TeV machine. The charged beam and radiative Bhabha power losses for the new High Luminosity parameter set are also presented

First principles calculations of tetragonal FeX X S, Se, Te Magnetism, hyperfine interaction, and bonding

Magnetic ground states, local crystallographic environment of Fe, and hyperfine interaction parameters in tetragonal FeX X S, Se, Te are investigated by means of density functional theory DFT calculations using augmented plane waves plus local orbitals APW lo method. We use several different mag netic configurations to evaluate the magnetic and electronic properties of this system, as well as the hyperfine interaction parameters at Fe lattice site. The results obtained for the ground state collinear anti ferromagnetic arrangement relatively well reproduce the quadruple splitting and isomer shifts from the available Mössbauer measurements. The Bader s atoms in molecule charge density analysis indicates bonding of closed shell type and a sizable charge transfer from Fe to X . The system properties are sensitive to the structural optimization of the position of the chalcogen atom with respect to the iron plan

The BDSLD task: Summary and deliverables (Overview of EuroTeV results on the optical design of the Linear Collider Beam Delivery System)

This report is the deliverable of the EUROTeV Beam Delivery System Lattice Design (BDSLD) and gives an overview of the published results

Large polarons in dry DNA: temperature and anharmonic effects

We study the influence of temperature on large polarons in DNA molecules. Employing the mean field approximation we derive the slight generalization of the SSH Hamiltonian with temperature dependent parameters. It was found that the degree of the modification of system parameters is very weak at physiologically relevant temperature which indicates that the free acoustic polarons as charge carriers may be responsible for DNA conductivity.1st Euro Mediterranean Meeting on Functionalized Materials (EMM-FM), Sep 06-10, 2011, Sousse, Tunisi

Large polarons in dry DNA: temperature and anharmonic effects

We study the influence of temperature on large polarons in DNA molecules. Employing the mean field approximation we derive the slight generalization of the SSH Hamiltonian with temperature dependent parameters. It was found that the degree of the modification of system parameters is very weak at physiologically relevant temperature which indicates that the free acoustic polarons as charge carriers may be responsible for DNA conductivity