Patent ID: 7442945
Filing Date: 2008-10-28
Classification: G01K

Abstract:
1. A Faraday assembly of an ion implantation apparatus comprising: a Faraday cup disposed in a vacuum chamber of the apparatus; a driving shaft extending outwardly from the vacuum chamber, the Faraday cup being connected to the driving shaft in the vacuum chamber; main power means disposed outside the vacuum chamber for exerting forces on the driving shaft that move the driving shaft in a first direction in which the driving shaft is extended further into the vacuum chamber and a second direction in which the driving shaft is drawn out of the vacuum chamber, whereby the Faraday cup can be advanced or retreated in the vacuum chamber; and auxiliary power means for exerting a force, independently of the force exerted by the main power means, that acts on the driving shaft in said second direction as the driving shaft is being moved by the main power means in said second direction.