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collimator definition

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1 : a device of radiation-absorbent material intended for defining the direction and angular divergence of the radiation beam. [ASTM E1316-94] 2 : a piece of hardware placed between the sputtering cathode and the wafer during physical vapor deposition that filters out low-angled sputtered material and thus enhances step coverage into contacts and vias on the wafer surface.

See also:

Collision Theory definition
combination bands definition
complex definition
class definition
Clubbing definition