scholarly journals Hot spot heating process estimate using a laser-accelerated quasi-Maxwellian deuteron beam

2011 ◽  
Vol 30 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Xiaoling Yang ◽  
George H. Miley ◽  
Kirk A. Flippo ◽  
Heinrich Hora
Keyword(s):  
Beam Energy ◽  
Short Pulse ◽  
Hot Spot ◽  
Ion Beam ◽  
Deuteron Beam ◽  
Heating Process ◽  
Energy Calculation ◽  
Ignition Process ◽  
Beam Focusing ◽  
Proton Beam Energy

AbstractThe hot spot heating process by an assumed deuteron beam is evaluated in order to estimate the contribution of the energy produced by the deuteron beam-target fusion to the heating process. The deuteron beam energy versus the number of deuterons is evaluated through the experimentally achieved proton beam energy distribution using the TRIDENT short pulse laser at the Los Alamos National Laboratory (LANL). The corresponding hot spot heating is then calculated using this assumed deuteron beam spectrum. The resulting first order heating dynamics is employed in the expanded “bonus” energy calculation, and a 12.73% extra energy from deuteron beam-target fusion was found with the assumed deuteron spectrum when ρrb = 4.5 g/cm2 is considered, where ρ is the fuel density, and rb is the ion beam focusing radius on the target. The results provide further insight into the contribution of the extra heat produced by deuteron beam-target fusion to the hot spot ignition process. A further analysis of how a converter foil using ultra-high-density cluster materials can help to achieve the yield requirements for ignition is presented.

Generation of Deuteron Beam from the Plasma Focus

2005 ◽  
Vol 107 ◽  
pp. 151-0 ◽  
Author(s):  
Chiow San Wong ◽  
S.L. Yap
Keyword(s):  
Plasma Focus ◽  
Beam Energy ◽  
Ion Beam ◽  
Deuteron Beam ◽  
Discharge Voltage ◽  
Filling Pressure ◽  
Beam Production ◽  
Deuterium Gas ◽  
Time Of Flight Method ◽  
Gas Pressures

The generation of deuteron beam from a 3 kJ Mather type plasma focus is studied. Two simple ion collectors made of copper plates are employed and are placed at the axis of the electrodes to detect the ion beam. The deuteron beam intensity at various deuterium gas pressures is determined together with ion beam energy using the time of flight method. For a series of discharges of the present plasma focus system operated at 15 kV discharge voltage, ion beams of energies ranging from 50 to 200 keV have been measured. The suitable deuterium filling pressure for ion beam production for electrodes lengths of 16 cm, 22 cm and 27 cm are 1 mbar, 0.7 mbar and 0.5 mbar respectively.

scholarly journals Progress in heavy ion target capsule and hohlraum design

2002 ◽  
Vol 20 (3) ◽  
pp. 405-410 ◽  
Author(s):  
DEBRA A. CALLAHAN ◽  
MARK C. HERRMANN ◽  
MAX TABAK
Keyword(s):  
Beam Energy ◽  
Short Pulse ◽  
Ion Beam ◽  
Large Angle ◽  
Heavy Ion ◽  
Beam Power ◽  
Beam Spot ◽  
Short Pulse Laser ◽  
Surface Finishes ◽  
Hybrid Target

Progress in heavy ion target design over the past few years has focused on relaxing the target requirements for the driver and for target fabrication. We have designed a plastic (CH) ablator capsule that is easier to fabricate and fill than the beryllium ablator we previously used. In addition, two-dimensional Rayleigh–Taylor instability calculations indicate that this capsule can tolerate ablator surface finishes up to 10 times rougher than the NIF specification. We have also explored the trade-off between surface roughness and yield as a method for finding the optimum capsule. We have also designed two new hohlraums: a “hybrid” target and a large-angle, distributed radiator target. The hybrid target allows a beam spot radius of almost 5 mm while giving gain of 55 from 6.7 MJ of beam energy in integrated Lasnex calculations. To achieve the required symmetry with the large beam spot, internal shields were used in the target to control the P2 and P4 asymmetry. The large-angle, distributed radiator target is a variation on the distributed radiator target that allows large beam entrance angles (up to 24°). Integrated calculations have produced 340 MJ from 6.2 MJ of beam energy in a design that is not quite optimal, In addition, we have done a simple scaling to understand the peak ion beam power required to compress fuel for fast ignition using a short pulse laser.

Proton Beam Energy Determination Using a Device for Range Measurement of an Accelerated High Energy Ion Beam

2011 ◽  
Vol 59 (2(2)) ◽  
pp. 679-685 ◽  
Author(s):  
Yeun-Soo Park ◽  
Jae-Hong Kim ◽  
Geun-Beom Kim ◽  
Bong-Hwan Hong ◽  
In-Su Jung ◽  
...  
Keyword(s):  
Proton Beam ◽  
Beam Energy ◽  
Ion Beam ◽  
High Energy ◽  
Range Measurement ◽  
Proton Beam Energy ◽  
Energy Determination

SOME EXPERIMENTAL TECHNIQUES AT STORAGE RINGS

2009 ◽  
Vol 18 (02) ◽  
pp. 465-473 ◽  
Author(s):  
◽  
M. HARTMANN
Keyword(s):  
Beam Energy ◽  
Ion Beam ◽  
Deuteron Beam ◽  
Target Thickness ◽  
Experimental Techniques ◽  
High Precision Measurement ◽  
Revolution Frequency ◽  
Polarized Proton ◽  
Order Of Magnitude ◽  
Repeated Passage

Two experimental techniques that have been developed at the COoler SYnchrotron COSY-Jülich are presented: (i) The energy of a stored polarized proton or deuteron beam can be precisely determined by sweeping an rf magnetic dipole or solenoid field over a spin resonance. This perturbation induces a beam depolarization, which is maximal at the spin resonance's frequency. That frequency, together with the beam revolution frequency, determines the beam's kinematic γ factor, which can thus be measured with high accuracy. Therefore, the beam energy can be determined about one order of magnitude more precisely than with conventional methods based on orbit length measurements. The technique has been used at COSY for an experiment aiming at a high-precision measurement the mass of the η meson. (ii) The repeated passage of a coasting ion beam through a thin internal target leads to a beam-energy loss and a shift of its revolution frequency. This shift is proportional to the beam-target overlap and thus allows one to measure the target thickness and hence the luminosity during the corresponding experiment. This effect has been studied quantitatively with a 2.65 GeV proton beam impinging on a hydrogen cluster-jet target at the ANKE spectrometer. After a careful error evaluation the luminosity, could be determined with an accuracy of better than 5%.

Time resolved diagnostic of ion beam energy distribution function for plasma thrusters

1997 ◽  
Author(s):  
Christelle Philippe ◽  
Claude Laure ◽  
Andre Bouchoule ◽  
Christelle Philippe ◽  
Claude Laure ◽  
...  
Keyword(s):  
Distribution Function ◽  
Energy Distribution ◽  
Beam Energy ◽  
Ion Beam ◽  
Energy Distribution Function ◽  
Time Resolved ◽  
Plasma Thrusters

scholarly journals Determination of energy gain time dependent in D+T mixture with calculating total energy deposited of deuteron beam in hot spot

2014 ◽  
Vol 1 (1) ◽  
pp. 7-21
Author(s):  
S. N. Hoseinimotlagh ◽  
M. Jahedi
Keyword(s):  
Laser Pulse ◽  
Inertial Confinement Fusion ◽  
Hot Spot ◽  
Deuteron Beam ◽  
Energy Gain ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Inertial Confinement ◽  
Fusion Reactions ◽  
Coupled Equations

The fast ignition (FI) mechanism, in which a pellet containing the thermonuclear fuel is first compressed by a nanosecond laser pulse, and then  irradiated by an intense "ignition" beam, initiated by a  high power picosecond laser pulse,  is one of the promising approaches to the realization of the inertial confinement fusion (ICF). If the ignition beam is composed of deuterons, an additional energy is delivered to the target, coming from fusion reactions of the beam-target type, directly initiated by particles from the ignition  beam .In this work, we choose the D+T fuel and  at first step we compute the average reactivity in terms of temperature for first time at second step we use the obtained results of step one and calculate the total deposited energy of deuteron beam inside the target fuel at available physical condition then in  third step we introduced the dynamical balance equation of D+T mixture and solve these nonlinear  differential coupled  equations versus time .In forth step we compute the power density and energy gain under physical optimum conditions and at final step we concluded that  maximum  energy deposited  in the target from D+T and D+D reaction are equal to  to19269.39061 keV and 39198.58043 keV respectively.  

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