Download Vacuum Electronics: Components and Devices by Joseph A. Eichmeier, Manfred Thumm PDF

By Joseph A. Eichmeier, Manfred Thumm

Nineteen specialists from the electronics undefined, examine institutes and universities have joined forces to arrange this booklet. It does not anything lower than supply an entire review of the electrophysical basics, the current cutting-edge and functions, in addition to the long run customers of microwave tubes and structures. The e-book does a similar for optoelectronics vacuum units, electron and ion beam units, gentle and X-ray emitters, particle accelerators and vacuum interrupters.

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Faillon et al. the cavity is the sum of all the charges induced by the electrons in the gap at time t. This can be expressed mathematically by stating that I2 (t) is the integral of Ib (z, t) from L1 to L1 + d2 . 37) with G0 = I0 /V0 and D2 = ωd2 /v0 . The voltage V2 induced in this second cavity (between the ends of gap d2 ) is given further in the Sect. 1. Behaviour of the Second Cavity The coupling coefficients, for instance M2 , are always <1 and express the fact that the field E2 = −V2 ejωt /d2 experienced by an electron is a function of time and changes during the traveling of this electron through the gap.

Collector Current Limitation by Space Charge Effects Assume the beam of Fig. 32 approaching a collector entrance iris at a reduced potential, as shown in Fig. 33. The question arises about the limited beam current Ilimit which can pass without reflections into the collector tunnel at a depressed collector potential VC . Note: VC is measured with respect to the cathode potential. 63) below, the maximum current depends on the ratio of the collector tunnel radius to the beam radius b/a pressed to avoid reflection of parts of the beam for a given beam current and the ratio of the collector entrance radius b to the beam radius a (Fig.

At that condition the phase velocity is equal to the moving electron density bunch vbunch which is forming in the decelerating phase of the RF wave. It is the velocity of the slow space charge wave on the electron beam moving backwards with the velocity −vsc or, looking from outside, with the velocity ve − vsc . 42) vp = ve − vsc = vbunch is the fundamental synchronism condition of a TWT. The understanding of this interaction and RF amplification process can be enlightened by the following everyday observation.

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