A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Barth, W.A.

Paper Title Page
MOPD26 The FAIR Proton Linac: The First Linac based on Normal Conducting CH-DTL 115
 
  • G. Clemente, W.A. Barth, L. Groening, S.G. Yaramyshev
    GSI, Darmstadt
  • R. M. Brodhage, U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main
 
 

The antiproton program at FAIR requires a dedicated proton linac to be used as injector for the SIS 100 synchroton. This 325 MHz linac will accelerate up to 70 mA proton beam to the injection energy of 70 MeV. This linac will be the first machine based on CH-DTL's, the novel cavity developt by Frankfurt University and GSI. This new cavity is characterized by the lack of internal focusing elements which allows the construction of very compact cavities resulting in a higher shunt impedance when compared to conventional RF structure. The proton linac is based on 6 coupled CH-DTL followed by three standard CH's for a total length of around 25 meters. A complete description of the beam dynamics together with the general status of the project is presented and discussed,

 
MOPD31 Beam Dynamics Simulations for the Laser Proton Injector Transport Line 130
 
  • A. Orzhekhovskaya, W.A. Barth, I. Hofmann, S.G. Yaramyshev
    GSI, Darmstadt
 
 

The DYNAMION code was implemented to perform beam dynamics simulations for the different possible transport lines for a proton beam with an energy of 10 MeV, coming from a high intensity laser ion source. It was intended to check the chromaticity and space charge effects taking into account high order aberrations. The investigations were done for a solenoidal and alternatively for a quadrupole channel applying different beam parameters (as input energy spread, transverse divergency, current) as well as different layouts of the transport line. The beam evolution along the transport, the emittance growth and the beam transmission were analyzed and compared. Finally the influence of an RF buncher, required to match the proton beam to the following accelerating structure, was investigated.

 
TUO2A02 An Effective Space Charge Solver for DYNAMION Code 290
 
  • A. Orzhekhovskaya, W.A. Barth, S.G. Yaramyshev
    GSI, Darmstadt
 
 

An effective analytical and semi-analytical method for internal electrical field calculations was proposed for ellipsoidal shaped beam as well as for a beam of arbitrary longitudinal shape with an elliptical transverse cross section. This method combines acceptable accuracy with a high speed of computation. The existing version of the DYNAMION code uses the particle-particle method to calculate the electrical field, which needs a significant time for computation. A semi-analytical algorithm of electrical field calculation was introduced into DYNAMION code. It allows much faster beam dynamics simulations than the old one (above 5·103 particles). The DYNAMION parameter "macroparticle size" was investigated in connection with the new space charge algorithm. The beam dynamics simulations were performed through the 1st Alvarez tank of the UNILAC using the original and the new method. The RMS emittance growth as a benchmark parameter shows sufficient agreement between both solvers.

 

slides icon

Slides

 
THO1A04 Advanced Beam Dynamics Simulations with the DYNAMION Code for the Upgrade and Optimization of the GSI-UNILAC 556
 
  • S.G. Yaramyshev, W.A. Barth, G. Clemente, L.A. Dahl, L. Groening, S. Mickat, A. Orzhekhovskaya, H. Vormann
    GSI, Darmstadt
  • A. Kolomiets, S. Minaev
    ITEP, Moscow
  • U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main
 
 

With the advanced multi-particle code DYNAMION it is possible to calculate beam dynamics in linear accelerators and transport lines under space charge conditions with high accuracy. Special features as data from the real topology of RFQ electrodes, drift tubes, quadrupole lenses, misalignment and fabrication errors and consideration of field measurements lead to reliable results of the beam dynamics simulations. Recently the DYNAMION code is applied to the upgrade and optimization of the UNILAC as an injector for the Facility for Antiproton and Ion Research at Darmstadt (FAIR). An operation of the FAIR requres for the increase of the beam- intensity and -brilliance coming from the UNILAC (up to factor 5). End-to-end simulations for the whole linac (from ion source output to the synchrotron entrance) allow for the study and optimization of the overall machine performance as well as for calculation of the expected impact of different upgrade measures, proposed to improve beam brilliance. The results of the beam dynamics simulations by means of the DYNAMION code are compared with the recent measurements, obtained after upgrade of the High Current Injector (GSI-UNILAC-HSI) in 2009.

 

slides icon

Slides