Bunch Extension Monitor for LINAC of SPIRAL2 facility

WEPC20International audienceMeasurements of the bunch longitudinal shape of beam particles are crucial for optimization and control of the LINAC beam parameters and maximization of its integrated luminosity. The non-interceptive bunch extension monitor for LINAC of SPIRAL2 facility is being developed at GANIL. The five bunch extension monitors are to be installed on the entrance of LINAC between superconducting cavities. The principle of monitor operation is based on registration of x-rays induced by ions of accelerator beam and emitted from thin tungsten wire. The monitor consists of two parts: system for wire insertion and positioning and x-ray detector based on microchannel plates. The prototype of detector has been developed and was tested using protons and heavy ions beams

On the new approach to variable separation in the time-dependent Schr\"odinger equation with two space dimensions

We suggest an effective approach to separation of variables in the Schr\"odinger equation with two space variables. Using it we classify inequivalent potentials $V(x_1,x_2)$ such that the corresponding Schr\" odinger equations admit separation of variables. Besides that, we carry out separation of variables in the Schr\" odinger equation with the anisotropic harmonic oscillator potential $V=k_1x_1^2+k_2x_2^2$ and obtain a complete list of coordinate systems providing its separability. Most of these coordinate systems depend essentially on the form of the potential and do not provide separation of variables in the free Schr\" odinger equation ($V=0$).Comment: 21 pages, latex, to appear in the "Journal of Mathematical Physics" (1995

Simulation of optimal control of industrial corporations that produce complex dynamic systems engineering

In the article economic models to improve management efficiency by industrial corporations on the basis of scenario planning, management hierarchies Corporation. The role of business process reengineering in the formation of the integrated structures as a tool for the restructuring of the system of material, financial and information flows, aimed at reforming the organizational structure, optimizing the use of resources, improving the quality of products

Static and dynamic management models production at the entity

Static and dynamic economic-mathematical models for the solution of tasks of information support and optimization of integrated management of engineering procedures at the entity are described. Within these models algorithms of the solution of static and dynamic tasks of information support and complex optimization of management of engineering procedures at the entity are proposed

Production of neutron-rich fragments with neutron number N > Nprojectile in the reaction 48^{48}Ca (60 MeV/nucleon) + Ta

Expérience GANIL, Spectrometre LISEInternational audienceThe goal of the present paper is to attempt to clarify the nuclear reaction mechanism leading to the production of fragments at zero degree with neutron number larger than that in the 48Ca projectile, at about 60 MeV per nucleon. The production cross sections of the extremely neutron-rich Si and P isotopes were measured. Concerning the nuclear reaction mechanism leading to the production of these isotopes, one should probably refer to a particular type of transfer mechanism, which results in low excitation energy for the fragments, rather than to the ‘genuine' fragmentation mechanism. An upper limit of about 0.05 pb was estimated for the production cross section for the 47P isotope for which no count was observed

Towards local electromechanical probing of cellular and biomolecular systems in a liquid environment

Electromechanical coupling is ubiquitous in biological systems with examples ranging from simple piezoelectricity in calcified and connective tissues to voltage-gated ion channels, energy storage in mitochondria, and electromechanical activity in cardiac myocytes and outer hair cell stereocilia. Piezoresponse force microscopy (PFM) has originally emerged as a technique to study electromechanical phenomena in ferroelectric materials, and in recent years, has been employed to study a broad range of non-ferroelectric polar materials, including piezoelectric biomaterials. At the same time, the technique has been extended from ambient to liquid imaging on model ferroelectric systems. Here, we present results on local electromechanical probing of several model cellular and biomolecular systems, including insulin and lysozyme amyloid fibrils, breast adenocarcinoma cells, and bacteriorhodopsin in a liquid environment. The specific features of SPM operation in liquid are delineated and bottlenecks on the route towards nanometer-resolution electromechanical imaging of biological systems are identified.Comment: 37 pages (including refs), 8 figure

A bunch extension monitor for the SPIRAL2 LINAC

MOPD26, PosterInternational audienceMeasurements of the bunch longitudinal shape of beamparticles are crucial for optimization and control ofLINAC beam parameters and maximization of itsintegrated luminosity. The non-interceptive bunchextension monitor for the LINAC of SPIRAL2 facility isbeing developed at GANIL. Five bunch extensionmonitors will be installed at the beginning of the LINACbetween superconducting cavities. The principle ofoperation is based on the registration of x-rays induced byions of accelerator beam interacting with a thin tungstenwire positioned on the beam path. The monitor consists oftwo parts: a system for wire insertion and positioning, andan x-ray detector based on microchannel plates (MCP). Adetector prototype has been developed for three years andwas tested using protons and heavy ions beams. Theinfluence of the cryomodule operation on the diagnosticmeasurement was also studied

Bunch Extension Monitor for LINAC of SPIRAL2 Project

Poster, TUPG59International audienceA semi-interceptivemonitor for bunch shapemeasure-ment has been developed forthe LINAC of SPIRAL2. A Bunch ExtensionMonitor (BEM) is based on the registra-tionof X-rays emitted by the interaction of the beam ions with a thin tungsten wire. Thetime difference between detected X-rays and accelerating RF gives information aboutdistribution of beamparticles along the time axis. Thesemonitors will be installedinside diagnostic boxes on the first five warm sections of the LINAC. The monitorconsists of two parts: X-ray detector and mechanical system for positioning the tungstenwire into the beam. Emitted X-rays are registered by microchannel plates withfast readout. Signal processing is performed with constant fraction discriminatorsand TAC coupled with MCA. Results of bunch shape measurements obtained duringcommissioning of RFQ for SPIRAL2 are presented

SPIRAL2 Bunch Extension Monitor

THIOC01International audienceSuperconducting linacs require beam diagnostics toquantify the time extension of the bunch for a proper beamadaptation. Bunch extension monitor (BEM) shouldprovide measurements with required resolution andminimal disturbance of beam properties, have a broaddynamic range of beam intensity and should be easy to usefor accelerator routine operation. The design of BEMshould take into account operation at the vicinity ofcryomodules and satisfy imposed requirements for this.BEM measures the x-rays resulting of the bunchinteraction with a tungsten wire. Developed prototype ofdetector was successfully tested with ions beams. Test fordetector background conditions at vicinity of cryomodulewas carried out and results are presented