Effect of tapered magnetic field on expanding laser produced plasma for heavy ion inertial fusion

The ion source performance required for heavy ion inertial fusion (HIF) is beyond that used for current operating particle accelerator facilities. Ion sources are required to provide several tens to hundreds mA of low charge state heavy ions (q/A~100-200), such as Bi1+ to minimize the difficulty of a final focusing system caused by space charge repulsion force.[1] A laser ion source (LIS) is one of a promising candidate of such ion sources..

Effect of tapered magnetic field on expanding laser produced plasma for heavy ion inertial fusion

The ion source performance required for heavy ion inertial fusion (HIF) is beyond that used for current operating particle accelerator facilities. Ion sources are required to provide several tens to hundreds mA of low charge state heavy ions (q/A~100-200), such as Bi1+ to minimize the difficulty of a final focusing system caused by space charge repulsion force.[1] A laser ion source (LIS) is one of a promising candidate of such ion sources..

Operating experience with the laser ion source relevant the HIF application

Since March 2014, a laser ion source (LIS) has been used to provide high brightness low charge state heavy ion beams for regular routine operation of the hadron accelerator complex in Brookhaven National Laboratory (BNL)[1]. The peak current and pulse width of the typical beams from the LIS are several hundreds of microampere and about 200 microseconds, respectively. Of course, these specifications cannot be directly applied to the HIF. However, only by reducing the plasma drift distance to one tenth, the beam current and pulse width will become 1000 times and 1/10 respectively and these values are not far from the HIF’s requirements. Therefore, it would be useful to discuss some operational difficulties and to investigate what should be improved in the existing LIS in BNL toward the HIF application..

Investigation of Plasma Formation with ns Laser by Using Focused Sub-ns Laser Probe

A laser ablation plasma formation process was investigated by shooting another laser beam. The initial plasma was created by a mildly focused nanosecond laser beam and the probe laser, which has about ten times shorter pulse length with tightly focussed condition, was irradiated on it. By analysing high temperature plasma created by the probe laser, we could detect an interaction between the initial low temperature plasma and the probe laser. The interaction caused that the velocity of high temperature plasma generated by the sub-ns laser became smaller and the amount of the highly charged ions decreased. We found that the interaction does not occur during the irradiation of the first half of the ns laser. This fact indicates that the plasma is not produced during the first half of the ns laser

Investigation of Plasma Formation with ns Laser by Using Focused Sub-ns Laser Probe

A laser ablation plasma formation process was investigated by shooting another laser beam. The initial plasma was created by a mildly focused nanosecond laser beam and the probe laser, which has about ten times shorter pulse length with tightly focussed condition, was irradiated on it. By analysing high temperature plasma created by the probe laser, we could detect an interaction between the initial low temperature plasma and the probe laser. The interaction caused that the velocity of high temperature plasma generated by the sub-ns laser became smaller and the amount of the highly charged ions decreased. We found that the interaction does not occur during the irradiation of the first half of the ns laser. This fact indicates that the plasma is not produced during the first half of the ns laser

Ion energy distributions from laser-generated plasmas at two different intensities

Laser-generated non-equilibrium plasmas were analyzed at Brookhaven National Laboratory (NY, USA) and MIFT Messina University (Italy). Two laser intensities of 1012 W/cm2 and 109 W/cm2, have been employed to irradiate Al and Al with Au coating targets in high vacuum conditions. Ion energy distributions were obtained using electrostatic analyzers coupled with ion collectors. Time of flight measurements were performed by changing the laser irradiation conditions. The study was carried out to provide optimum keV ions injection into post acceleration systems. Possible applications will be presented

Ion energy distributions from laser-generated plasmas at two different intensities

Laser-generated non-equilibrium plasmas were analyzed at Brookhaven National Laboratory (NY, USA) and MIFT Messina University (Italy). Two laser intensities of 1012 W/cm2 and 109 W/cm2, have been employed to irradiate Al and Al with Au coating targets in high vacuum conditions. Ion energy distributions were obtained using electrostatic analyzers coupled with ion collectors. Time of flight measurements were performed by changing the laser irradiation conditions. The study was carried out to provide optimum keV ions injection into post acceleration systems. Possible applications will be presented