scholarly journals Longitudinal Beam Dynamics for the Heavy-Ion Synchrotron Booster Ring at HIAF

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
D. Y. Yin ◽  
J. Liu ◽  
G. D. Shen ◽  
H. Du ◽  
J. C. Yang ◽  
...  
Keyword(s):  
High Intensity ◽  
Heavy Ion ◽  
High Energy ◽  
Beam Dynamics ◽  
Bunch Length ◽  
Voltage Amplitude ◽  
Energy Fluctuation ◽  
Beam Emittance ◽  
Beam Loss ◽  
Injection Energy

To accelerate high-intensity heavy-ion beams to high energy in the booster ring (BRing) at the High-Intensity Heavy-Ion Accelerator Facility (HIAF) project, we take the typical reference particle 238U35+, which can be accelerated from an injection energy of 17 MeV/u to the maximal extraction energy of 830 MeV/u, as an example to study the basic processes of longitudinal beam dynamics, including beam capture, acceleration, and bunch merging. The voltage amplitude, the synchronous phase, and the frequency program of the RF system during the operational cycle were given, and the beam properties such as bunch length, momentum spread, longitudinal beam emittance, and beam loss were derived, firstly. Then, the beam properties under different voltage amplitude and synchronous phase errors were also studied, and the results were compared with the cases without any errors. Next, the beam properties with the injection energy fluctuation were also studied. The tolerances of the RF errors and injection energy fluctuation were dictated based on the CISP simulations. Finally, the effect of space charge at the low injection energy with different beam intensities on longitudinal emittance and beam loss was evaluated.

scholarly journals Heavy-ion beam focusing with a wall-stabilized plasma lens

1995 ◽  
Vol 13 (2) ◽  
pp. 221-229 ◽  
Author(s):  
A. Tauschwitz ◽  
E. Boggasch ◽  
D.H.H. Hoffmann ◽  
J. Jacoby ◽  
U. Neuner ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Focal Spot ◽  
Ion Beam ◽  
Heavy Ion ◽  
Spot Size ◽  
High Energy ◽  
Experimental Program ◽  
Focal Spot Size ◽  
Beam Emittance ◽  
Beam Focusing

Focusing of heavy-ion beams is an important issue for ion beam-driven inertial confinement fusion. For the experimental program to investigate matter at high energy densities at GSI, the application of a plasma lens has attractive features compared to standard quadrupole lenses. A plasma lens using a wall-stabilized discharge has been systematically investigated and optimized for this purpose. Different lenses were tested in several runs at the GSI linear accelerator UNILAC and at the SIS-synchrotron. A remarkably high accuracy and reproducibility of the focusing were found. The focal spot size was mainly limited by the beam emittance. A summary of experimental results and important limitations of the focal spot size is given.

Rapid Cycling Synchrotrons and Accumulator Rings for High-Intensity Hadron Beams

2013 ◽  
Vol 06 ◽  
pp. 143-169 ◽  
Author(s):  
Jingyu Tang
Keyword(s):  
High Intensity ◽  
Nuclear Physics ◽  
High Energy Physics ◽  
Heavy Ion ◽  
High Energy ◽  
Beam Power ◽  
Accelerator Physics ◽  
Rapid Cycling ◽  
Accelerator Technology ◽  
Energy Physics

Boosted by the needs in high-energy physics and nuclear physics and also multidisciplinary applications, high-intensity proton synchrotrons and accumulator rings have been developed quickly around the world over the last 30 years. New projects and plans are proposed with even higher beam power. The proton beam power has increased from less than 10 kW in the 1970s to about 1 MW level today, and the required beam power in the coming decade is a few MW. This article reviews the achievements in designing and constructing rapid cycling synchrotrons (RCSs) and accumulator rings (ARs) and the future development trends, principally on proton beams but also including heavy ion beams. It presents the evolution of RCS and AR machines, today's design philosophy, relevant accelerator physics, and also state-of-the-art accelerator technology.

scholarly journals High intensity heavy ion beam emittance measurements at the GSI UNILAC

2007 ◽  
Author(s):  
W. Bayer ◽  
W. Barth ◽  
L. Dahl ◽  
P. Forck ◽  
P. Gerhard ◽  
...  
Keyword(s):  
High Intensity ◽  
Ion Beam ◽  
Heavy Ion ◽  
Beam Emittance ◽  
Heavy Ion Beam

Electrical resistivity of high energy density matter generated by high intensity heavy ion beams

2006 ◽  
Vol 133 ◽  
pp. 1089-1091 ◽  
Author(s):  
S. Udrea ◽  
N. Shilkin ◽  
D. Varentsov ◽  
N. A. Tahir ◽  
R. Bock ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Energy Density ◽  
High Intensity ◽  
Heavy Ion ◽  
High Energy ◽  
Ion Beams ◽  
High Energy Density ◽  
Density Matter

Void-Lattice Formation in Natural Fluorite by Electron Irradiation

1976 ◽  
Vol 34 ◽  
pp. 614-615 ◽  
Author(s):  
L.E. Murr
Keyword(s):  
Electron Microscope ◽  
Electron Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Stoichiometric Ratio ◽  
Direct Observations ◽  
Transmission Electron ◽  
Anion Vacancies ◽  
Cation And Anion Vacancies ◽  
Lattice Formation

The production of void lattices in metals as a result of displacement damage associated with high energy and heavy ion bombardment is now well documented. More recently, Murr has shown that a void lattice can be developed in natural (colored) fluorites observed in the transmission electron microscope. These were the first observations of a void lattice in an irradiated nonmetal, and the first, direct observations of color-center aggregates. Clinard, et al. have also recently observed a void lattice (described as a high density of aligned "pores") in neutron irradiated Al2O3 and Y2O3. In this latter work, itwas pointed out that in order that a cavity be formed,a near-stoichiometric ratio of cation and anion vacancies must aggregate. It was reasoned that two other alternatives to explain the pores were cation metal colloids and highpressure anion gas bubbles.Evans has proposed that void lattices result from the presence of a pre-existing impurity lattice, and predicted that the formation of a void lattice should restrict swelling in irradiated materials because it represents a state of saturation.

Electron and ion irradiation-induced dissolution of mechanical twins in the intermetalic U3Si: An in situ HVEM study

1989 ◽  
Vol 47 ◽  
pp. 652-653
Author(s):  
Charles W. Allen ◽  
Robert C. Birtcher
Keyword(s):  
Elevated Temperatures ◽  
Ion Irradiation ◽  
Ion Beam ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Heavy Ion ◽  
High Energy ◽  
Mechanical Twinning ◽  
In Situ Experiments

The uranium silicides, including U3Si, are under study as candidate low enrichment nuclear fuels. Ion beam simulations of the in-reactor behavior of such materials are performed because a similar damage structure can be produced in hours by energetic heavy ions which requires years in actual reactor tests. This contribution treats one aspect of the microstructural behavior of U3Si under high energy electron irradiation and low dose energetic heavy ion irradiation and is based on in situ experiments, performed at the HVEM-Tandem User Facility at Argonne National Laboratory. This Facility interfaces a 2 MV Tandem ion accelerator and a 0.6 MV ion implanter to a 1.2 MeV AEI high voltage electron microscope, which allows a wide variety of in situ ion beam experiments to be performed with simultaneous irradiation and electron microscopy or diffraction.At elevated temperatures, U3Si exhibits the ordered AuCu3 structure. On cooling below 1058 K, the intermetallic transforms, evidently martensitically, to a body-centered tetragonal structure (alternatively, the structure may be described as face-centered tetragonal, which would be fcc except for a 1 pet tetragonal distortion). Mechanical twinning accompanies the transformation; however, diferences between electron diffraction patterns from twinned and non-twinned martensite plates could not be distinguished.

scholarly journals POSSIBILITY OF FORMING A LARGE DCC IN ULTRA-RELATIVISTIC HEAVY-ION COLLISIONS

2000 ◽  
Vol 15 (15) ◽  
pp. 2269-2288
Author(s):  
SANATAN DIGAL ◽  
RAJARSHI RAY ◽  
SUPRATIM SENGUPTA ◽  
AJIT M. SRIVASTAVA
Keyword(s):  
Three Dimensional ◽  
Thermal Fluctuations ◽  
Heavy Ion ◽  
High Energy ◽  
Chiral Condensate ◽  
Relativistic Heavy Ion Collisions ◽  
Maximum Temperature ◽  
Chiral Field ◽  
Heavy Nuclei ◽  
True Vacuum

We demonstrate the possibility of forming a single, large domain of disoriented chiral condensate (DCC) in a heavy-ion collision. In our scenario, rapid initial heating of the parton system provides a driving force for the chiral field, moving it away from the true vacuum and forcing it to go to the opposite point on the vacuum manifold. This converts the entire hot region into a single DCC domain. Subsequent rolling down of the chiral field to its true vacuum will then lead to emission of a large number of (approximately) coherent pions. The requirement of suppression of thermal fluctuations to maintain the (approximate) coherence of such a large DCC domain, favors three-dimensional expansion of the plasma over the longitudinal expansion even at very early stages of evolution. This also constrains the maximum temperature of the system to lie within a window. We roughly estimate this window to be about 200–400 MeV. These results lead us to predict that extremely high energy collisions of very small nuclei (possibly hadrons) are better suited for observing signatures of a large DCC. Another possibility is to focus on peripheral collisions of heavy nuclei.

scholarly journals Elliptic flow of colored glass in high energy heavy ion collisions

2003 ◽  
Vol 554 (1-2) ◽  
pp. 21-27 ◽  
Author(s):  
Alex Krasnitz ◽  
Yasushi Nara ◽  
Raju Venugopalan
Keyword(s):  
Heavy Ion Collisions ◽  
Elliptic Flow ◽  
Heavy Ion ◽  
High Energy ◽  
Colored Glass ◽  
Ion Collisions
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