diffusion associated neoclassical indigenous system of hall assembly danisha diffusion associated neoclassical indigenous system of hall assembly danisha dr a b rajib hazarika phd miamp germany fras lond mwaset a e s lecturer dept of mathematics diphu govt college diphu assam india the present study is related different geometry of the hall thrusters in which i have tried to get better results than the simple hall thrusters available at present with the future next generation device duo triad tokomak collider dttc hub by the using new type of code diffusion associated neoclassical indigenous hall assembly danisha hall thrusters were studied independently in the us and the ussr in the s and ' s however the concept of a hall thruster was only developed into an efficient propulsion device in the former soviet union whereas in the us scientists focused instead on developing girded ion thruster two types of hall thrusters were developed in the soviet union a thruster with wide acceleration zone spd russian spt stationary plasma thruster at design bureau fake b thruster with narrow acceleration zone das in english tal thruster with anode layer at the central research institute for machine building tsniimash soviet and russian spd thrusters the common spd design was largely the work of a i morozov spd engines were operated since they were mainly used for satellite stabilization in north south and in east west directions since then until the late s spd engines completed their mission and some continued to be operated thrust of the first generation of spd engines spd and spd was and mn respectively in spd and spd were introduced their thrust being mn and mn in the post soviet russia high power a few kilowatts spd spd spd t and low power less than w spd were introduced spt has a life time of hrs efficiency of soviet and russian das type engines include d and d soviet built thrusters were introduced to the west in after a team of electric propulsion specialists under the support of the ballistic missile defense organization visited soviet laboratories and experimentally evaluated the spd i e a mm diameter spt thruster over hall thrusters have been flown on soviet russian satellites in the past thirty years they were used mainly for station keeping and small orbital corrections currently hall thruster research design and theoretical modeling are led by experts at nasa glenn research center and the jet propulsion laboratory a considerable amount of development is being conducted in industry such as aerojet and busek co this technology was used on the european lunar mission smart and is used on a number of commercial geostationary satellites what's a hall thruster the hall thruster is a type of plasma based propulsion systems for space vehicles the amount of fuel that must be carried by a satellite depends on the speed with which the thruster can eject it chemical rockets have very limited fuel exhaust speed plasmas can be ejected at much higher speeds therefore less fuel need be carried on board the hall thruster was invented in the late 's until the mid 's it has been developed primarily by the russians during the past years the russian placed in orbit more than hall thrusters however the vast majority of satellites worldwide have relied on chemical thrusters and to a lesser extent arc jet thrusters and ion thrusters a conventional electrostatic ion thruster consists of two grids an anode and a cathode between which a voltage drop occurs positively charged ions accelerate away from the anode toward the cathode grid and through it after the ions get past the cathode electrons are added to the flow neutralizing the output to keep it moving a thrust is exerted on the anode cathode system in a direction opposite to that of the flow unfortunately a positive charge builds up in the space between the grids limiting the ion flow and therefore the magnitude of the thrust that can be attained in a hall thruster electrons injected into a radial magnetic field neutralize the space charge the magnitude of the applied magnetic field is approximately gauss strong enough to trap the electrons by causing them to spiral around the field lines in the coaxial channel the magnetic field and a trapped electron cloud together serve as a virtual cathode the ions too heavy to be affected by the field continue their journey through the virtual cathode the movement of the positive and negative electrical charges through the system results