Provided is a field emission apparatus including a pipe-shaped emitter holder comprising an electrically conductive material and a first internal space communicated in a first direction, and an emitter electrode having one or more yarns each having a structure extending in the first direction in which a plurality of CNTs that extend in the first direction are aggregated, and the emitter electrode is inserted in the first internal space while extending in the first direction.

A charged particle beam source that may include an emitter that has a tip for emitting charged particles; a socket; electrodes; a filament that is connected to the electrodes and to the emitter; electrodes for providing electrical signals to the filament; a support element that is connected to the emitter; and a support structure that comprises one or more interfaces for contacting only a part of the support element while supporting the support element.

A charged particle beam source that may include an emitter that has a tip for emitting charged particles; a socket; electrodes; a filament that is connected to the electrodes and to the emitter; electrodes for providing electrical signals to the filament; a support element that is connected to the emitter; and a support structure that comprises one or more interfaces for contacting only a part of the support element while supporting the support element.

A charged particle beam source, such as for use in an electron microscope, can include a mounting member defining a first opening at a free end of the mounting member and a bore extending from the first opening into the mounting member along a longitudinal axis of the mounting member. A second opening can be defined in a side wall of the mounting member and can extend between an outer surface of the mounting member and the bore, the second opening being spaced apart from the first opening along the longitudinal axis of the mounting member. An emitter member can be received in the bore and aligned along the longitudinal axis of the mounting member. A fixative material can be received in the bore and in the second opening to retain the emitter member in the bore.

A system and method for injecting a medication, the system comprising an injection syringe comprising a sensor, an indicator light, and/or a digital meter. The sensor can be a blood vessel sensor, such as, a blood pressure sensor, a pressure sensor, and/or a RAMAN spectroscopy tool. The method can comprise, obtaining the syringe filled with a fluid, inserting the needle, checking the indicator, and based on the indicator, dispensing the fluid.

A charged particle beam source, such as for use in an electron microscope, can include an electrically conductive support member coupled to a base, a mounting member coupled to the support member and defining a bore, and an emitter member received in the bore and retained by a fixative material layer flowed around the emitter member in the bore.

A charged particle beam source, such as for use in an electron microscope, can include an electrically conductive support member coupled to a base, a mounting member coupled to the support member and defining a bore, and an emitter member received in the bore and retained by a fixative material layer flowed around the emitter member in the bore.

A charged particle beam source that may include an emitter that has a tip for emitting charged particles; a socket; electrodes; a filament that is connected to the electrodes and to the emitter; electrodes for providing electrical signals to the filament; a support element that is connected to the emitter; and a support structure that comprises one or more interfaces for contacting only a part of the support element while supporting the support element.

A charged particle beam source that may include an emitter that has a tip for emitting charged particles; a socket; electrodes; a filament that is connected to the electrodes and to the emitter; electrodes for providing electrical signals to the filament; a support element that is connected to the emitter; and a support structure that comprises one or more interfaces for contacting only a part of the support element while supporting the support element.

Provided is a field emission apparatus including a pipe-shaped emitter holder comprising an electrically conductive material and a first internal space communicated in a first direction, and an emitter electrode having one or more yarns each having a structure extending in the first direction in which a plurality of CNTs that extend in the first direction are aggregated, and the emitter electrode is inserted in the first internal space while extending in the first direction.