SU999179A2

SU999179A2 - Microtron

Info

Publication number: SU999179A2
Application number: SU813335855A
Authority: SU
Inventors: Игорь Всеволодович Алексеев; Александр Анатольевич Вишневский; Владимир Иванович Голубев; Виктор Петрович Степанчук
Priority date: 1981-09-09
Filing date: 1981-09-09
Publication date: 1983-02-23

Description

(54) МИКРОТРОН(54) MICROTRON

1one

Изобретение относитс к ускорительг ной технике и может быть использованопри разработке микротронов.The invention relates to an accelerator technique and can be used in the development of microtrons.

По основному авт. св. № 898628 известен микротрон, содержащий магнит и резонатор, с общей медианной плоскостью и отверстием дл инжекиии в резонаторе , а также расположенный вне резонатора инжектор-группирователь, ось которого ориентирована перпендикул рно JQ медианной плоскости микротрона, а микроттрон снабжен парой отклон ющих электродов , расположенных в месте пересечени указанных оси и плоскости напротив отверсти дл инжекдни в резонаторе, is при этом средн плоскость отклон юших электродов совмещена со взаимно перпендикул рными ос ми инжектора-группиро- вател и отверсти дл инжекции в резонаторе f 11 .V 20According to the main author. St. No. 898628 is known a microtron containing a magnet and a resonator, with a common median plane and a hole for injection in the resonator, as well as an injector-grouper located outside the resonator, the axis of which is oriented perpendicular to JQ of the median plane of the microtron, and the microtron has a pair of deflecting electrodes located in the intersection of the indicated axes and the plane opposite the hole for the injector in the resonator, is at the same time the median plane of the deviating electrodes is aligned with the mutually perpendicular axes of the injector-group ers pyro- and openings for injection into the cavity 11 f .V 20

В этом микротроне могут быть реализованы все известные режимы ускорени , однако дл получени достаточно высоких токов ускоренного пучка инжекторгруппирователь должен формировать электронный поток с плотност ми тока в дес тки и сотни ампер с квадратного сантиметра . При этом термокатод - источник ускор емых электронов - работает в форсированном режиме и имеет неудовлечуворительный низкий срок службы.In this microtron, all known acceleration modes can be realized; however, to obtain sufficiently high currents of the accelerated beam, the injector group must generate an electron flow with current densities of tens and hundreds of amperes per square centimeter. In this case, the thermal cathode, the source of accelerated electrons, works in the forced mode and has an unsatisfactory low service life.

Целью изобретени 5шл етс увеличение срока службы катода инжектора-группировател .The aim of the invention is to increase the service life of the cathode of the injector-grouper.

Указанна цель достигаетс тем, что в микротрон введена планка из вещества с коэффициентом вторично-электронной эмиссии на прострел больше единицы, расположенна в плоскости внутренней поверхности стенки резонатора и закрывающа отверстие дл инжекпии.This goal is achieved by inserting a strap of a substance with a secondary electron emission coefficient per chamber more than one into the microtron, located in the plane of the inner surface of the resonator wall and closing the injection hole.

На чертеже изображен микротрон, разрез в медианной плоскости.The drawing shows a microtron, cut in the median plane.

Claims

The microroe contains a resonator 1 with an injection hole 2, an injection group 3, for example, a klystron type, a system 4 of deflecting electrodes and a film 5 of a substance with a secondary electron emission coefficient per chamber greater than one, located in the plane limited by the cavity cavity 1, perpendicular to the opening of the TEC) 2 and its full crack. In addition, the drawing shows the trajectories of the electron beam 6 formed by the injector grouping 3, the trajectories of the accelerated electrons 7, as well as the direction of the leading magnetic field of the microtron B. The device works as follows. The injector-grinder 3 forms a density-modulated electron beam 6, which, under the action of crossed electric fields of the system 4 of deflecting electrodes and the driving magnetic field of the microtron, drifts along the axis direction U of the resonator 1 and bombards the film 5 of the substance with the secondary emission coefficient on chamber GV 1. As a result, the electron flux multiplies by (U times, i.e., the current amplitude of the injected electrons increases by the same time. Since the secondary electron emission process can to assume that the current of the injected electrons is dependent on the time of the microwave field of the microtron as inertia-free with the period of the microwave field repeats the same dependence of the current of the 5 electrons bombarding the film 6. Thus, while maintaining the starting current of the accelerated electrons, the current amplitude of the bombarding current of the square will be 5 electrons 6 need to be reduced approximately by (Y times, that for fixed transverse dimensions of the beam 6 is equivalent to a corresponding decrease in the current collector density from the cathode of the injector grouping. This, in turn, will reduce the operating temperature of the cathode and increase its service life, and this opens up the possibility of increasing the non-breakdown time of the microtron without replacing the cathode of the injector-grouper 3. In addition, reducing the current density in the electron beam 6 formed by the injector - by the grouper 3, facilitates the grouping of electrons by density, since the effect of spatial charge decreases, which leads to an additional improvement of the accelerator characteristics. The invention formula Mikrotron on author. St. M 898628, characterized in that, in order to increase the life of the cathode of the injector-buncher, a film of a substance with a secondary electron emission coefficient per chamber greater than one is inserted into it, located in the plane of the inner surface of the resonator wall and closing the injection hole. Sources of information taken into account in the examination 1 "USSR Author's Certificate No. 898628, cl. H 05 H 7/00, 1980.