A system includes a collimated beam source within a vacuum chamber, a condensable barrier gas, cooling material, a pump, and isolation chambers cooled by the cooling material to condense the barrier gas. The method further includes eliminating a trench mesh contained within the trench border of the trench circuit element. In a linear race, the linear guide portions 16a and 17a come into contact with adjacent roller retainers 15 respectively. A plunger of the syringe is depressed to inject medication and to deflect the latch members to disengage the catches and release the shield, whereupon the shield automatically advances to the extended position. Each of the at least one vibration reduction unit includes at least one protrusion and at least one groove. Also, an electromagnet is proposed for an electromagnetic drive of an executing device.