scholarly journals An Evaluation of Energy-loss Straggling Calculation of the LISE++ Code

2020 ◽  
Vol 22 (4) ◽  
pp. 409-414
Author(s):  
Duy Ngoc Nguyen ◽  
Nguyen Nhu Le ◽  
Nguyen Kim Uyen
Keyword(s):  
Experimental Data ◽  
Energy Loss ◽  
Large Range ◽  
Early Stage ◽  
Heavy Ion ◽  
Ion Beams ◽  
Alpha Particles ◽  
Computer Codes ◽  
Energy Reaction

Energy loss straggling was found to be critical in evaluating the energy reaction using heavy-ion beams during the early stage of experiments at accelerator facilities. Despite a significant attempt in simulating this quantity using computer codes such as LISE++ and SRIM, there still exists a discrepancy between experimental data and computed results. In this study, we provide a greatly improved precision of estimations using the LISE++ code by evaluating the energy loss straggling of the alpha particles at 5.486 MeV in Tb, Ta, and Au materials. After comparing with the observables, it was found that the ratio of the energy loss straggling computed by the LISE++ code to that measured in experiments has a fairly large range of 1.5 - 3.0. For this reason, the so-called modified LISE++ calculation is constructed by adding the adjusting parameters into the original estimation to minimize the uncertainty of the straggling prediction. The modified calculation has shown dramatic improvements in computed energy loss straggling, which are almost similar to those obtained in the measurements, of 5.486-MeV alphas in the aforementioned materials with the atomic numbers in a range of Z = 65 – 79.

scholarly journals Energy loss dynamics of intense heavy ion beams interacting with solid targets

2002 ◽  
Vol 20 (3) ◽  
pp. 485-491 ◽  
Author(s):  
D. VARENTSOV ◽  
P. SPILLER ◽  
N.A. TAHIR ◽  
D.H.H. HOFFMANN ◽  
C. CONSTANTIN ◽  
...  
Keyword(s):  
Energy Loss ◽  
Ion Beam ◽  
Theoretical Models ◽  
Heavy Ion ◽  
High Energy ◽  
Ion Beams ◽  
High Energy Density ◽  
Back Surface ◽  
Hydrodynamic Simulations ◽  
Gas Targets

At the Gesellschaft für Schwerionenforschung (GSI, Darmstadt) intense beams of energetic heavy ions have been used to generate high-energy-density (HED) state in matter by impact on solid targets. Recently, we have developed a new method by which we use the same heavy ion beam that heats the target to provide information about the physical state of the interior of the target (Varentsov et al., 2001). This is accomplished by measuring the energy loss dynamics (ELD) of the beam emerging from the back surface of the target. For this purpose, a new time-resolving energy loss spectrometer (scintillating Bragg-peak (SBP) spectrometer) has been developed. In our experiments we have measured energy loss dynamics of intense beams of 238U, 86Kr, 40Ar, and 18O ions during the interaction with solid rare-gas targets, such as solid Ne and solid Xe. We observed continuous reduction in the energy loss during the interaction time due to rapid hydrodynamic response of the ion-beam-heated target matter. These are the first measurements of this kind. Two-dimensional hydrodynamic simulations were carried out using the beam and target parameters of the experiments. The conducted research has established that the ELD measurement technique is an excellent diagnostic method for HED matter. It specifically allows for direct and quantitative comparison with the results of hydrodynamic simulations, providing experimental data for verification of computer codes and underlying theoretical models. The ELD measurements will be used as a standard diagnostics in the future experiments on investigation of the HED matter induced by intense heavy ion beams, such as the HI-HEX (Heavy Ion Heating and EXpansion) EOS studies (Hoffmann et al., 2002).

scholarly journals The dependence of heavy-ion-induced adhesion on energy loss and time

1986 ◽  
Vol 1 (2) ◽  
pp. 231-233 ◽  
Author(s):  
R.G. Stokstad ◽  
P.M. Jacobs ◽  
I. Tserruya ◽  
L. Sapir ◽  
G. Mamane
Keyword(s):  
Energy Loss ◽  
Gold Film ◽  
Peel Test ◽  
Heavy Ion ◽  
Ion Beams ◽  
Stopping Power ◽  
Metallic Films ◽  
Thin Gold Film ◽  
Native Oxides ◽  
Electronic Stopping Power

The ability of heavy-ion beams to enhance the adhesion of thin metallic films to substrates has been studied as a function of projectile species. Measurements of the adhesion enhancement of a thin gold film to substrates of tantalum and silicon (with native oxides) have been made for beams of 12C, 16O, 28Si, 35Cl, and 58Ni at 2.85 MeV/nucleon. The threshold dose required to pass the Scotch tape peel test was found for the Au-Ta system to be D th (cm−2) = 1017 (dE / dx)−3±0.2 where dE/dx is the electronic stopping power (MeV mg−1 cm−2) of the ion in Au. For the Au-Si system, Dth = 6×1018 (dE/dx)−4.1±0.3. The steep dependence of D th on dE/dx found here is in contrast with an earlier measurement for the Au-Ta system by Tombrello et al. The adhesion enhancement was observed to decrease with time after the bombardment in a manner suggesting that diffusion of atoms through the gold film is important. The possible importance of small concentrations of extraneous atoms at the interface is discussed.

Time-resolved energy loss spectroscopy of energetic heavy ion beams generating a dense plasma

2001 ◽  
Vol 174 (1-2) ◽  
pp. 215-221 ◽  
Author(s):  
D. Varentsov ◽  
P. Spiller ◽  
U.N. Funk ◽  
D.H.H. Hoffmann ◽  
A. Kozyreva ◽  
...  
Keyword(s):  
Energy Loss ◽  
Dense Plasma ◽  
Heavy Ion ◽  
Ion Beams ◽  
Time Resolved

Axial Observation of X-Ray Spectra from a Beam-Foil Source

1988 ◽  
Vol 102 ◽  
pp. 339-342
Author(s):  
J.M. Laming ◽  
J.D. Silver ◽  
R. Barnsley ◽  
J. Dunn ◽  
K.D. Evans ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Heavy Ion ◽  
Ion Beams ◽  
Beam Axis ◽  
Doppler Broadening ◽  
X Ray ◽  
Beam Foil

AbstractNew observations of x-ray spectra from foil-excited heavy ion beams are reported. By observing the target in a direction along the beam axis, an improvement in spectral resolution, δλ/λ, by about a factor of two is achieved, due to the reduced Doppler broadening in this geometry.

Diagnostics of metal samples using the results of experimental and theoretical study of positively charged microparticles formed upon sample destruction

2018 ◽  
Vol 84 (10) ◽  
pp. 23-28
Author(s):  
D. A. Golentsov ◽  
A. G. Gulin ◽  
Vladimir A. Likhter ◽  
K. E. Ulybyshev
Keyword(s):  
Experimental Data ◽  
Early Stage ◽  
Experimental Studies ◽  
Material Model ◽  
Total Charge ◽  
Cross Sectional ◽  
Practical Applications ◽  
Mechanical And Electrical Properties ◽  
Order Of Magnitude ◽  
Using Data

Destruction of bodies is accompanied by formation of both large and microscopic fragments. Numerous experiments on the rupture of different samples show that those fragments carry a positive electric charge. his phenomenon is of interest from the viewpoint of its potential application to contactless diagnostics of the early stage of destruction of the elements in various technical devices. However, the lack of understanding the nature of this phenomenon restricts the possibility of its practical applications. Experimental studies were carried out using an apparatus that allowed direct measurements of the total charge of the microparticles formed upon sample rupture and determination of their size and quantity. The results of rupture tests of duralumin and electrical steel showed that the size of microparticles is several tens of microns, the particle charge per particle is on the order of 10–14 C, and their amount can be estimated as the ratio of the cross-sectional area of the sample at the point of discontinuity to the square of the microparticle size. A model of charge formation on the microparticles is developed proceeding from the experimental data and current concept of the electron gas in metals. The model makes it possible to determine the charge of the microparticle using data on the particle size and mechanical and electrical properties of the material. Model estimates of the total charge of particles show order-of-magnitude agreement with the experimental data.

Laser-cooled and trapped atoms as a precision target for heavy ion beams

1996 ◽  
Vol 99 (1) ◽  
pp. 127-133 ◽  
Author(s):  
U. Schünemann ◽  
I. Manek ◽  
R. Grimm ◽  
D. Habs ◽  
D. Schwalm
Keyword(s):  
Heavy Ion ◽  
Ion Beams ◽  
Trapped Atoms

Pseudorapidity distribution of relativistic singly charged particles in heavy-ion collisions at high energy

1999 ◽  
Vol 77 (4) ◽  
pp. 313-318 ◽  
Author(s):  
F -H Liu ◽  
Y A Panebratsev
Keyword(s):  
Experimental Data ◽  
Heavy Ion Collisions ◽  
Charged Particles ◽  
Heavy Ion ◽  
High Energy ◽  
Pseudorapidity Distribution ◽  
Ion Collisions ◽  
Singly Charged

The pseudorapidity distribution of relativistic singly charged particles produced in high-energy heavy-ion collisions is described by the thermalized cylinder picture. The calculated results are in agreement with the experimental data of lead-induced interactions at 158A GeV/c. PACS Nos.:25.75.-q and 25.75.Dw

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