A method for temperature control during a process of cleaving a plurality of free-standing thick films from a bulk material includes clamping a bulk material using a mechanical clamp device adapted to engage the bottom region of the bulk material through a seal with a planar surface of a stage to form a cavity with a height between the bottom region and the planar surface. Reliance on manual coil selection and markers is eliminated by adaptively determining the coils of an MR system that produce a preferred sensitivity to a desired field-of-view. The display is provided with a first and a second frame where each frame displays selected electronic media from the electronic media collection. The processor then outputs the enhanced image. An example apparatus comprises a impedance ladder with taps forming the junctions between impedances the PGA is then programmed by grounding the taps through terminating resistors. The cathode defines a hollow cavity in communication with the discharge region through an aperture that has a substantially annular configuration around a central axis of said radiation source so as to initiate said discharge.