scholarly journals Beam losses in heavy ion drivers

2002 ◽  
Vol 20 (4) ◽  
pp. 637-640 ◽  
Author(s):  
E. MUSTAFIN ◽  
O. BOINE-FRANKENHEIM ◽  
I. HOFMANN ◽  
P. SPILLER
Keyword(s):  
Nuclear Research ◽  
Heavy Ion ◽  
Beam Current ◽  
Relativistic Heavy Ion Collider ◽  
European Organization ◽  
Beam Loss ◽  
Secondary Neutron ◽  
Experimental Physics ◽  
Heavy Ion Fusion ◽  
Good Agreement

While beam loss issues have hardly been considered in detail for heavy ion fusion scenarios, recent heavy ion machine developments in different labs (European Organization for Nuclear Research(CERN), Gesellschaft für Schwerionenforschung (GSI), Institute for Theoretical and Experimental Physics (ITEP), Relativistic Heavy-Ion Collider (RHIC)) have shown the great importance of beam current limitations due to ion losses. Two aspects of beam losses in heavy ion accelerators are theoretically considered: (1) secondary neutron production due to lost ions, and (2) vacuum pressure instability due to charge exchange losses. Calculations are compared and found to be in good agreement with measured data. The application to a Heavy-Ion Driven Inertial Fusion (HIDIF) scenario is discussed.

scholarly journals Phase space growth during RF capture in the GSI heavy ion synchrotron SIS-18

2003 ◽  
Vol 21 (1) ◽  
pp. 85-89
Author(s):  
M. KIRK ◽  
H. DAMERAU ◽  
I. HOFMANN ◽  
O. BOINE-FRANKENHEIM ◽  
P. SPILLER ◽  
...  
Keyword(s):  
Phase Space ◽  
Nuclear Research ◽  
Heavy Ion ◽  
Beam Current ◽  
Current Profile ◽  
Momentum Spread ◽  
European Organization ◽  
Frequency Capture ◽  
A Value ◽  
Ion Species

This study reports on the optimization of the radio frequency capture phase during the operational cycle of the SIS-18 synchrotron at Gesellschaft für Schwerionenforschung, Darmstadt, Germany. The ion species studied were 238U+28 and 238U73+ at an injection energy of 11.4 MeV/u. The longitudinal relative momentum spread derived from Schottky spectra of the coasting beam at injection provides a value of |Δp/p0|full-width ∼ 5 × 10−3. Simulation results from the synchrotron tracking code ESME (FermiLab) were compared with beam-current profile measurements obtained from a pickup. To gain further insight, the Tomography program (European Organization for Nuclear Research) has been used to derive the longitudinal phase space development from waterfall plots of the measured beam current profile, which may then be compared against simulation. Possible causes of this nonadiabaticity are discussed and solutions are proposed.

scholarly journals Overview of virtual national laboratory objectives, plans, and projects

2002 ◽  
Vol 20 (3) ◽  
pp. 369-375 ◽  
Author(s):  
B.G. LOGAN ◽  
C.M. CELATA ◽  
J.W. KWAN ◽  
E.P. LEE ◽  
M. LEITNER ◽  
...  
Keyword(s):  
Focal Spot ◽  
National Laboratory ◽  
Heavy Ion ◽  
Beam Current ◽  
Secondary Electrons ◽  
Ion Energy ◽  
Space Potential ◽  
High Beam Current ◽  
Heavy Ion Fusion ◽  
Made In

Significant experimental and theoretical progress has been made in the U.S. heavy ion fusion program on high-current sources, transport, and focusing. Currents over 200 mA have been transported through a matching section and 10 half-lattice periods with electric quadrupoles. An experiment shows control of high-beam current with an aperture, while avoiding secondary electrons. New theory and simulations of the neutralization of intense beam space charge with plasma in various focusing chamber configurations predict that near-emittance-limited beam focal spot sizes can be obtained even with beam perveance (ratio of beam space potential to ion energy) >10× higher than in earlier HIF focusing experiments. Progress in a new focusing experiment with plasma neutralization up to 10−3 perveance, and designs for a next-step experiment to study beam brightness evolution from source to target are described.

scholarly journals Strangeness Enhancement at LHC Energies Using the Thermal Model and EPOSLHC Event Generator

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Mahmoud Hanafy ◽  
Omnia S. A. Qandil ◽  
Asmaa G. Shalaby
Keyword(s):  
Cosmic Ray ◽  
Heavy Ion ◽  
Event Generator ◽  
Relativistic Heavy Ion Collider ◽  
Model Calculations ◽  
High Energies ◽  
Particle Ratios ◽  
Strangeness Enhancement ◽  
The Mean ◽  
Good Agreement

The strangeness enhancement signature of QGP formation at LHC energies is carefully tackled in the present study. Based on HRG, the particle ratios of mainly strange and multistrange particles are studied at energies from lower s ~ 0.001 up to 13 TeV. The strangeness enhancement clearly appeared at more high energies, and the ratios are confronted to the available experimental data. The particle ratios are also studied using the Cosmic Ray Monte Carlo (CRMC) interface model with its two different event generators, namely, EPOS 1.99 and EPOSlhc, which show a good agreement with the model calculations at the whole range of the energy. We utilize them to produce some particles ratios. EPOS 1.99 is used to estimate particle ratios at lower energies from AGS up to the Relativistic Heavy Ion Collider (RHIC) while EPOSlhc is used at LHC energies. The production of kaons and lambda particles is studied in terms of the mean multiplicity in p-p collisions at energies ranging from 4 to 26 GeV. We find that both HRG model and the used event generators, EPOS 1.99 and EPOSlhc, can describe the particle ratios very well. Additionally, the freeze-out parameters are estimated for different collision systems, such as p-p and Pb-Pb, at LHC energies using both models.

scholarly journals Bends and momentum dispersion during final compression in heavy ion fusion drivers

2002 ◽  
Vol 20 (4) ◽  
pp. 581-584 ◽  
Author(s):  
EDWARD P. LEE ◽  
JOHN J. BARNARD
Keyword(s):  
Heavy Ion ◽  
Beam Current ◽  
Beam Radius ◽  
Large Space ◽  
Order Of Magnitude ◽  
Increased Strength ◽  
System Configurations ◽  
Beam Envelope ◽  
Heavy Ion Fusion ◽  
Line Design

Between the accelerator and fusion chamber, the heavy ion beams are subject to a dramatic but vital series of manipulations, some of which are carried out simultaneously and involve large space charge forces. The beams' quality must be maintained at a level sufficient for the fusion application; this general requirement significantly impacts beam line design, especially in the considerations of momentum dispersion. Immediately prior to final focus onto a fusion target, heavy ion driver beams are compressed in length by typically an order of magnitude. This process is simultaneous with bending through large angles to achieve the required target illumination configuration. The large increase in beam current is accommodated by a combination of decreased lattice period, increased beam radius, and increased strength of the beamline quadrupoles. However, the large head-to-tail momentum tilt (up to 5%) needed to compress the pulse results in a very significant dispersion of the pulse centroid from the design axis. General design features are discussed. A principal design goal is to minimize the magnitude of the dispersion while maintaining approximate first order achromaticity through the complete compression/bend system. Configurations of bends and quadrupoles, which achieve this goal while simultaneously maintaining a locally matched beam-envelope, are analyzed.

Beam loss in heavy-ion fusion accelerators due to charge exchange scattering

1993 ◽  
Vol 106 (11) ◽  
pp. 1621-1630 ◽  
Author(s):  
D. Budicin ◽  
I. Hofmann ◽  
M. Conte ◽  
R. Schulze ◽  
F. Melchert ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Heavy Ion ◽  
Beam Loss ◽  
Exchange Scattering ◽  
Heavy Ion Fusion

Heavy-ion fusion reactions by using Yukawa form potential

2018 ◽  
Vol 33 (21) ◽  
pp. 1850120
Author(s):  
A. Avar ◽  
H. Hassanabadi ◽  
S. Hassanabadi
Keyword(s):  
Experimental Data ◽  
Potential Model ◽  
Heavy Ion ◽  
Universal Function ◽  
Fusion Reactions ◽  
Proximity Potential ◽  
Modified Model ◽  
Model Fusion ◽  
Heavy Ion Fusion ◽  
Good Agreement

Our purpose in this paper is to modify the original proximity potential by universal function available in the literature. A potential model with Yukawa proximity potential has been considered according to the modified model fusion reactions of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] which have been discussed in detail. The results have a good agreement with the experimental data.

Sign in / Sign up

Export Citation Format

Share Document