Oday A. Hussein

Al-Nahrain University · Department of Physics

The effect of choosing the electrostatic quadrupole deflector diameter (D) on the imaging characteristics and efficiency of 90°quadrupole deflector was investigated. The comparison between the electron beam radius at the image plan, time of fight and electron beams kinetic energy was made for electrostatic quadrupole deflector with different diamet...

The impact of adjusting the distance between the object source and the electrostatic quadrupole deflector on the picture produced when charged particles travel through the deflector is investigated in this study. The time of the fight, kinetic energy of the electron beam, and aberration figures were compared for electrostatic quadrupole deflectors...

The effect of changing object source distance from the electrostatic quadrupole deflector (DOSDqd) to the image resulting when charged particles pass through the deflector. The comparison between the aberration figures, kinetic energy of the electron beam and time of fight was made for DOSDqd. The results showed the best time of aberration image sh...

The effect of the radial arrangement of the electrodes of the electrostatic quadrupole lens on the efficiency of the electrostatic quadrupole quadruplet focusing system (EQQFS) was investigated. The optical properties and performance of EQQFS with different geometrical radius were compared, and the result was carried out to the system for point-to-...

The impact of the electrostatic quadrupole deflector diameter (E.Q.D.D) on the image characteristics and efficiency of the 90°quadrupole deflector was explored. For electrostatic quadrupole deflectors (E.Q.D) of various diameters, a comparison of aberration figures, electron beam kinetic energy, and fight time was done. The results revealed that wh...

This study investigates the effect of selection the electric pole radius of the four poles electrostatic doublets lens on the optical property. Also, a comparison between the optical property and performance of two lenses with different electrode radius was made. The results showed that the electric pole diameter of the lens plays main function in...

The simulation and optimization calculations were carried out for an einzel lens consists of three overlap cylindrical electrodes with the same length but with different electrode diameters under point-to-point focusing condition. The effects of the overlap distance (d) between the central and the outer cylindrical electrodes on the optical propert...

The effects of the gap distance between the electrodes and the extraction voltage on the spot, shape and the kinetic energy distribution of the argon ions were studied theoretically for a diode extraction system. The results showed that under specific conditions, a good focusing to ion- beam was found, where the dimensions of the ion spot were redu...

The comparisons between the optical properties of two types of electrostatic quadrupole lenses with the same dimensions and operation conditions are made. The optimum voltages of the electrodes which give the stigmatic image for both focusing planes with are calculated. The calculations are carried out for point-to-point focusing mode. The effects...

The optical properties of an electrostaticquadrupole doublet lens with two different electrode shapes were studied with the aid of computer simulation. The optimal electrode voltages of the electrostaticquadrupolelenses which give the stigmatic image in both planes simultaneously were found for both concave cylindrical electrode shape and plan elec...

Theoretical results are reported on thermal effects along the π- 1047nm and σ- 1053nm polarizations in a cut Nd: YLF rod crystal by using 20W Diode -End-pumped. The crystal length effects on the fraction of absorbed pump radiation converted into heat, radial temperature distribution, and the change in a radial refractive index. The result from this...

Key words The optimization calculations are made to find the optimum properties of combined quadrupole lens consist of electrostatic and magnetic lenses to produce achromatic lens. The modified bell-shaped model is used and the calculation is made by solving the equation of motion and finding the transfer matrices in convergence and divergence plan...

Key words The optimization calculations are made to find the optimum properties of combined quadrupole lens consist of electrostatic and magnetic lenses to produce achromatic lens. The modified bell-shaped model is used and the calculation is made by solving the equation of motion and finding the transfer matrices in convergence and divergence plan...