Heavy Ion Range Measurements in SSNTD Materials: A Review

2015 ◽  
Vol 238 ◽  
pp. 174-195
Author(s):  
P.K. Diwan ◽  
Hardev Singh Virk
Keyword(s):  
Solid State ◽  
Heavy Ions ◽  
Reliability And Validity ◽  
Heavy Ion ◽  
Measurement Methods ◽  
Range Measurements ◽  
Measured Range ◽  
Anisotropic Behaviour ◽  
Almost All ◽  
Semi Empirical

Range of heavy ion is one of the important parameters and understanding of this parameter is highly essential in almost all those experiments where heavy ions are used. The present review deals with the range measurements of different heavy ions through solid state nuclear track detectors (SSNTDs) technique. The importance of SSNTD technique as compared to other techniques is highlighted and different methods/models proposed for range measurements are described. An attempt has been made to compile the measured range values for heavy ions from H4to U238in different classes of SSNTD materials viz. polymers, glasses and minerals, from the available literature. An inter-comparison between the measured range values of different laboratories and through different range measurement methods has been made. Further, the reliability and validity of most commonly used theoretical and semi-empirical/empirical range formulations, through comparison with the measured range, are highlighted. Furthermore, the isotropic and anisotropic behaviour in polymers and minerals through range measurements has been described.Contents of Paper

Semi-Empirical LET Descriptions of Heavy Ions Used in the European Component Irradiation Facilities

2010 ◽  
Vol 57 (4) ◽  
pp. 1946-1949 ◽  
Author(s):  
Arto Javanainen ◽  
Wladyslaw Henryk Trzaska ◽  
Reno Harboe-Sørensen ◽  
Ari Virtanen ◽  
Guy Berger ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Semi Empirical ◽  
Irradiation Facilities

scholarly journals UV core dimming in coronal streamer belt and the projection effects

2019 ◽  
Vol 623 ◽  
pp. A95 ◽  
Author(s):  
L. Abbo ◽  
S. Giordano ◽  
L. Ofman
Keyword(s):  
Magnetic Structure ◽  
Heavy Ions ◽  
Solar Minimum ◽  
Heavy Ion ◽  
Spectral Lines ◽  
Slow Solar Wind ◽  
Physical Parameters ◽  
Streamer Belt ◽  
Coronal Streamer ◽  
Tilted Dipole

During solar minimum activity, the coronal structure is dominated by a tilted streamer belt, associated with the sources of the slow solar wind. It is known that some UV coronal spectral observations show a quite evident core dimming in heavy ions emission in quiescent streamers. In this paper, our purpose is to investigate this phenomenon by comparing observed and simulated UV coronal ion spectral line intensities. First, we computed the emissivities and the intensities of HI Lyα and OVI spectral lines starting from the physical parameters of a time-dependent 3D three-fluid MHD model of the coronal streamer belt. The model is applied to a tilted dipole (10°) solar minimum magnetic structure. Next, we compared the results obtained from the model in the extended corona (from 1.5 to 4 R⊙) to the UV spectroscopic data from the Ultraviolet Coronagraph Spectrometer (UVCS) onboard SOHO during the minimum of solar activity (1996). We investigate the line-of-sight integration and projection effects in the UV spectroscopic observations, disentangled by the 3D multifluid model. The results demonstrate that the core dimming in heavy ions is produced by the physical processes included in the model (i.e., combination of the effects of heavy ion gravitational settling, and energy exchange of the preferentially heated heavy ions through the interaction with electrons and protons) but it is visible only in some cases where the magnetic structure is simple, such as a (tilted) dipole.

Energy Loss for Swift Heavy Ions in Different Elemental Absorbers: A Different Approach for Effective Charge Parameterization

2015 ◽  
Vol 238 ◽  
pp. 196-205
Author(s):  
B. Rani ◽  
Kalpana Sharma ◽  
Neetu ◽  
Anupam ◽  
Shyam Kumar ◽  
...  
Keyword(s):  
Experimental Data ◽  
Energy Loss ◽  
Effective Charge ◽  
Heavy Ions ◽  
Close Agreement ◽  
Input Parameter ◽  
Quantum Mechanical ◽  
Swift Heavy Ions ◽  
Calculated Energy ◽  
Semi Empirical

The energy loss for swift heavy ions, covering Z=3-29(~0.2 - 5.0MeV/n), has been calculated in the elemental absorbers like C, Al and Ti. The present calculations are based on Bohr’s approach applicable in both classical and quantum mechanical regimes. The major input parameter, the effective charge, has been calculated in a different way without any empirical/semi-empirical parameterization. The calculated energy loss values have been compared with the available experimental data which results in a close agreement.

scholarly journals Stopping power of heavy ions in strongly coupled plasmas

1995 ◽  
Vol 13 (2) ◽  
pp. 311-319 ◽  
Author(s):  
G. Zwicknagel ◽  
C. Toepffer ◽  
P.-G. Reinhard
Keyword(s):  
Heavy Ions ◽  
Weak Coupling ◽  
Heavy Ion ◽  
Stopping Power ◽  
Electron Cooling ◽  
Strongly Coupled ◽  
Electron Plasmas ◽  
Coupling Behavior ◽  
Ion Storage ◽  
Coupled Plasmas

We investigate the stopping power of heavy ions in strongly coupled electron plasmas by performing molecular dynamics (MD) computer simulations. A comparison with conventional weak coupling theories shows that these fail in describing the stopping power at low ion velocities and strong coupling. Then nonlinear screening effects become important and this causes a change in the dependence of the stopping power on the ion charge Zp at low ion velocities. From the MD simulation, we find the stopping power to behave like ZP1.43 instead of the weak coupling behavior Zp2 ln(const/Zp). Similar results were recently obtained by experiments in connection with electron cooling at heavy ion storage rings.

scholarly journals A modular solid state detector for measuring high energy heavy ion fragmentation near the beam axis

1994 ◽  
Vol 23 (1) ◽  
pp. 65-81 ◽  
Author(s):  
C.J. Zeitlin ◽  
K.A. Frankel ◽  
W. Gong ◽  
L. Heilbronn ◽  
E.J. Lampo ◽  
...  
Keyword(s):  
Solid State ◽  
Heavy Ion ◽  
High Energy ◽  
Beam Axis ◽  
Solid State Detector ◽  
Ion Fragmentation ◽  
State Detector

scholarly journals Heavy Ion Acceleration at J-PARC

2018 ◽  
Vol 171 ◽  
pp. 21002
Author(s):  
Susumu SATO
Keyword(s):  
High Intensity ◽  
Heavy Ions ◽  
Particle Production ◽  
Heavy Ion ◽  
Proton Accelerator ◽  
Chiral Property ◽  
Region I ◽  
Particle Momentum ◽  
Low Mass ◽  
Frontier Studies

J-PARC, the Japan Proton Accelerator Research Complex, is an accelerator, which provides a high-intensity proton beam. Recently as a very attractive project, the acceleration of heavy ions produced by supplementary ion sources, called J-PARC-HI, is seriously contemplated by domestic as well as international communities. The planned facility would accelerate heavy ions up to U92+ with a beam energy 20 AGeV ([see formula in PDF] of 6.2 AGeV). The highlight of the J-PARC-HI project is its very high beam rate up to ~1011 Hz, which will enable the study of very rare events. Taking advantage of this high intensity, J-PARC-HI will carry out frontier studies of new and rare observables in this energy region: (i) nuclear medium modification of chiral property of vector mesons through low-mass di-lepton signal, (ii) QCD critical pointcharacterization through event-by-event fluctuation signals of particle production, (iii) systematic measurements related to the equation of state through collective flow signal or two-particle momentum correlation signal, or (iv) the search of hyper nuclei with multi strangeness including or exceeding S = 3. The current plan of J-PARC-HI aims to carrying out the first experimental measurements in 2025.

scholarly journals Outflowing protons and heavy ions as a source for the sub-keV ring current

2009 ◽  
Vol 27 (2) ◽  
pp. 839-849 ◽  
Author(s):  
T. T. Giang ◽  
M. Hamrin ◽  
M. Yamauchi ◽  
R. Lundin ◽  
H. Nilsson ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Ring Current ◽  
Particle Interaction ◽  
Heavy Ion ◽  
Local Times ◽  
Cluster Data ◽  
Abstract Data ◽  
Low Altitude ◽  
Field Lines ◽  
Different Characteristics

Abstract. Data from the Cluster CIS instrument have been used for studying proton and heavy ion (O+ and He+) characteristics of the sub-keV ring current. Thirteen events with dispersed heavy ions (O+ and He+) were identified out of two years (2001 and 2002) of Cluster data. All events took place during rather geomagnetically quiet periods. Three of those events have been investigated in detail: 21 August 2001, 26 November 2001 and 20 February 2002. These events were chosen from varying magnetic local times (MLT), and they showed different characteristics. In this article, we discuss the potential source for sub-keV ring current ions. We show that: (1) outflows of terrestrial sub-keV ions are supplied to the ring current also during quiet geomagnetic conditions; (2) the composition of the outflow implies an origin that covers an altitude interval from the low-altitude ionosphere to the plasmasphere, and (3) terrestrial ions are moving upward along magnetic field lines, at times forming narrow collimated beams, but frequently also as broad beams. Over time, the ion beams are expected to gradually become isotropised as a result of wave-particle interaction, eventually taking the form of isotropic drifting sub-keV ion signatures. We argue that the sub-keV energy-time dispersed signatures originate from field-aligned terrestrial ion energising and outflow, which may occur at all local times and persist also during quiet times.

scholarly journals Experimental investigation of ion beam transport in laser initiated plasma channels

2002 ◽  
Vol 20 (4) ◽  
pp. 559-563 ◽  
Author(s):  
D. PENACHE ◽  
C. NIEMANN ◽  
A. TAUSCHWITZ ◽  
R. KNOBLOCH ◽  
S. NEFF ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heavy Ions ◽  
Plasma Channel ◽  
Ion Beam ◽  
Heavy Ion ◽  
High Current ◽  
Beam Transport ◽  
Electrode Gap ◽  
Discharge Gap ◽  
The Magnetic Field

The aim of the presented experiments is to study the transport of a heavy ion beam in a high-current plasma channel. The discharge is initiated in NH3 gas at pressures between 2 and 20 mbar by a line-tuned CO2 laser. A stable discharge over the entire electrode gap (0.5 m) was achieved for currents up to 60 kA. Concerning the ion beam transport, the magnetic field distribution inside the plasma channel has to be known. The ion-optical properties of the plasma channel have been investigated using different species of heavy ions (C, Ni, Au, U) with 11.4 MeV/u during six runs at the Gesellschaft für Schwerionenforschungs-UNILAC linear accelerator. The high magnetic field allowed the accomplishment of one complete betatron oscillation along the discharge channel. The results obtained up to now are very promising and suggest that, by scaling the discharge gap to longer distances, the beam transport over several meters is possible with negligible losses.

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