Beam steering plate

This design also utilized two sets of beam steering plates. One set, labeled D1 and D2 in Fig. 12.9, constitute a pair of deflection plates employed to remove Ar+ from the extracted ion packets. A 230-V pulse of variable duration delayed from the repeller pulse eliminated more than 99% of these ions and prevented detector saturation. 

Yan F, Rose JL. Guided wave phased array beam steering in composite plates. In SPIE 2007 smart structures and NDE symposium, San Diego, CA 2007. p. 15. 

Fig. 39. Schematic showing the basics of cell projection. The desired beam shape is selected by steering the electron beam through the appropriate pattern in the aperture plate. By using a rectangular aperture the system can operate like a conventional direct-write e-beam tool, so any shape of pattern can be...

Fig. 1.33. Setup used by Smalley and coworkers to inject cluster ions into an ICR cell. The cluster beam is steered and focused by deflection plates and two Einzel lenses. Before entering the ICR cell, the cluster ions are decelerated. The inset shows the principle of an ICR mass spectrometer. Ions are excited by an rf-pulse to propagate in circular orbits. The image currents induced in the electrode plates are amplified and analyzed through computer-based Fourier transformation. The magnetic field in this scheme is perpendicular to the drawing plane. The schemes have been adopted from [71,177,178]...

Figure 14. Schematic diagram of the CO metastable TOF experimental apparatus is shown. The molecular beam (MB) containing 10% ketene in neon or helium can be placed at any acute angle (0,ab) relative to the flight path, and it is collimated by an electroformed skimmer (not shown). The photolysis laser is an unpolarized excimer (XeCl or XeF), and the probe laser is a pulse dye amplification system whose polarization can be made either parallel (sPR, ) or perpendicular (e ) to the flight path. The metastables pass through a 1-cm orifice and deflector plates and grids (both not shown), and they strike a heated Ni surface. Electrons produced from the Ni surface by the metastables are steered by a plate set at —1500 V onto a stack of 3 MCPs the resulting pulses are then amplified, discriminated against noise from dark current, and counted by a multichannel scaler.

FIGURE 11 The integration of a MEMS lenslet array with a VCSEL array to enable steering of the VCSEL output beams. Each MEMS lenslet can be independently moved in the X and Y directions by a micromachined element fabricated in a plate mounted in the path of the VCSEL beams. 

The ion optics, shown in Figure 6.1, are positioned between the skimmer cone and mass separation device and consist of one or more electrostatically controlled lens components, maintained at a vacuum of approximately 10 torr with a turbo-molecular pump. They are not traditional optics that we associate with ICP emission or atomic absorption, but are made up of a series of metallic plates, barrels, or cylinders, which have a voltage placed on them. The function of the ion optic system is to take ions from the hostile environment of the plasma at atmospheric pressure via the interface cones and steer them into the mass analyzer, which is under high vacuum. The nonionic species such as particulates, neutral species, and photons are prevented from reaching the detector by using some kind of physical barrier, positioning the mass analyzer off axis relative to the ion beam, or electrostatically bending the ions by 90° into the mass analyzer. 

The requirements for medical ultrasonic imaging transducers are met with 1-3 PZT-rod/polymer-matrix piezoelectric composites. The composites provide high electromechanical coupling and low impedance properties superior to those of the conventional piezoceramics and piezopolymers. Also composite plates can be formed into complex shapes for beam focusing and steering. 

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