US 8,148,923 B2Granted

Method for accelerating electrons in a linear accelerator and an accelerating structure for carrying out said method

AssigneesObschestvo S Ogranichennoi Otvetstvennostyu 'Nauka I Tekhnologii, Federalnoe Gosudarstvennoe Uchrezhdenie 'Federalnoe Agentstvo PO Pravovoi Zaschite Resultatov Intellektualnoi Deyatelnosti Voennogo, Spetsialnogo I Dvoinogo Naznachenia'Pri Ministertve Yustitsii Rossiyskoy Federatsii, Nauchno-Issledovatelski Institut Yadernoi Fiziki Imeni D.V. Skobeltsina Moskovskogo Gosudarstennogo Universiteta Imeni M.V. Lomonosova

InventorsAndrei Sergeevich Alimov, Boris Sarkisovich Ishkhanov, Nikolai Ivanovich Pakhomov, Viktor Petrovich Sakharov, Vasily Ivanovich Shvedunov

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Abstract

Low-injection energy electrons are accelerated in a continuous standing wave linear accelerator. Electron flow is supplied directly from a low-energy electron source to subsequent sequential accelerating units interconnected via connection cells. By grouping electrons in the first bunch resonator at a determined gap voltage, increasing the electron energy in a booster resonator and accelerating the electron energy in the accelerating unit, the optimal phase of particles with respect to the electromagnetic field is ensured. The length of each accelerating structure segment, which is located between centers of the adjacent cells, is based on the equality between the relation of the length of each following segment to the length of the previous segment and the relation of the average electron speed in the previous segment to the average electron speed in the following segment.

Method for accelerating electrons in linear accelerator and an accelerating structure for carrying out of the said method, including successive electrons grouping and their acceleration in high-frequency electromagnetic field formed in accelerating units, where the following operations are performed:

electrons supply directly from the source of low-energy electrons into accelerating units communicated via connection cells;
where Ug is the optimal voltage
electrons grouping using the first of accelerating units representing bunch resonator at the voltage Ug on its gap selected from the formula:
U
g
U
0
≈
7.36
π
⁡
(
4
⁢
n
-
1
)
where U0 is the voltage of electron source, n=1, 2, 3, . . . .
where Lg is the distance between gap centers
Where βo is the initial relative velocity of low energy electrons
increasing of electrons energy in the second of accelerating units representing booster resonator, so that their relative velocity becomes β≧0.4+0.5;
meantime, optimal grouping is provided as per the velocity of electron stream at the input of bunch resonator, and wavelength of high-frequency electromagnetic field is defined by selecting the distance Lg between the centers of bunch resonator and booster resonator based on the following relation:
L
g
β
0
=
4
⁢
n
-
1
2
⁢
λ
,
⁢
where
⁢
⁢
β
0
=
v
0
/
c
Where ν0 is velocity of electron stream at the input into bunch resonator,
c is light velocity,
λ is microwave field wavelength in free space,
n=1, 2, 3 . . . ;
and
increase of electron energy up to required values in the units following after the second accelerating unit;
meantime, ensuring of optimal particles phase with respect to electromagnetic field in, at least, accelerating units, to which non-relativistic electrons enter with kinetic energy less than a rest energy equal to 0.511 MeV electron energies, by selecting the length Li length of accelerating segment of the accelerating structure, which is located between the centers of adjacent connection units and comprising the said accelerating structure, provided that the length of each following segment in accelerating structure located between the centers of adjacent connection units and comprising the said structure, relates to that in previous segment, as average electron velocity in the previous segment relates to that in the following segment.

52 more elements

Abstract

Claims5