SU654058A1 - Method of setting phases and amplitudes of accelerating fields a multiresonating acceleretor of charged particles - Google Patents

Description

one

The invention relates to accelerator technology and can be used in the design of multiresonator accelerators of heavy particles.

The known method of setting the phases and amplitudes of accelerating fields in a multiresonator accelerator of charged particles, based on measuring the dependence of the field drop in the resonator caused by the beam on the phase of the accelerating field, followed by adjusting the amplitude of the field 1j.

In this way, the dependence of the decay of the field in the resonator caused by the beam on the phase of the accelerating field is investigated and a phase is selected, the floor of which coincides with its calculated value. After that, the amplitude of the field is set so that the time of flight of protons through the resonator is equal to its calculated value. The amplitude and phase setting procedure is then repeated many times until the desired convergence is obtained.

However, this method has low accuracy, due to the low sensitivity of the field decay to changes in amplitude and phase in the vicinity of VLX and large values.

Closest to the proposed method of setting the phases and amplitudes of the accelerating fields in a multiresonator charged particle accelerator, based on the excitation of resonators by RF oscillators and adjusting the amplitude of the field in each of the resonators until the change in the transit time of particles with a calculated value of 2.

In this way the installation phase and

Claims (1)

The 5 amplitudes of the field in each subsequent cavity are made after the completion of a similar installation in all previous resonators. At the same time, the time of flight of particles through the tunable and psg-following resonator is measured both when the generator is turned on and off, and as a result of the measurement processing, an amplitude of 3 fields is selected at which the value of the time-of-flight caused by switching on the generator for the tuned resonator . However, this method reveals the ambiguity of the installation of phases and amplitudes, which is especially strong at high particle energies and short resonator lengths. The purpose of the invention is to provide one installation value. This is achieved by means that, before adjusting the amplitude of the field in each of the resonators, a beam of particles is passed through a tuned resonator with the RF generator turned off, the phase of the field excited by the beam in the resonator is recorded with respect to the selected reference signal, after which the RF generator is switched on and its phase until the phase of the total field of the beam and the RF generator shifts relative to the field of the field when the RF generator is turned off by the calculated size. dlagaemogo method. The installation contains phase detector 1, phase shifter 2 first sensor 3 harmonics of the beam current, tunable resonator 4, second sensor 5 harmonics of the beam current, phase detector 6, terminal stage 7 of the RF generator, phase shifters 8.9 and key 1O. According to the proposed method, the following operations are carried out for setting the phase and amplitude of the accelerating field. Initially, the final stage 7 of the generator is turned off, and a small intensity beam is passed through the tuned accelerating resonator 4. Phase shifters 8 and 2 are set so that the output signals of the phase detectors 1 and 6 are equal to a predetermined value (for example, zero). After that, the phase shifter 8 is adjusted in the direction of lag, and the phase shifter 2 is adjusted in the direction of phase advance by an angle corresponding to the calculated change in the time of flight of particles through the resonator 4 when the field with the correctly set phase is switched on. In this case, the key 10 is still in the open state. This is where manual operations end and the rest proceeds automatically. After switching on the final stage of the generator 7 and the intense beam, the phase shifter 9 (connected 8 to the output of the phase detector 6) automatically sets the required phase of the accelerating field in the resonator 4, achieving a zero error signal from the output of the detector 6 to the phase shifter 9. Then close the switch . 10 and the phase shifter in the final stage of the generator automatically set the nominal amplitude of the accelerating field, achieving a zero error signal from the output of the detector 1 to the phase shifter in the generator. The proposed method ensures the unambiguity of the installation of phases and amplitudes in each of the resonators, is easily applicable to setting accelerators for high energies and small resonator lengths, allows the use of simple automation systems and eliminates the need to periodically check the installation of the phases and amplitudes of the accelerating fields of the resonators, since after installation it is also possible to maintain the phases and amplitudes near the optimal values found. Claims The method of setting the phases and amplitudes of the accelerating fields in a multiresonator charged particle accelerator, based on the excitation of resonators by RF generators and adjusting the amplitude of the field in each of the resonators until the change in the transit time of the particles with the calculated value coincides, and that, in order to ensure the uniqueness of the installation, before adjusting the amplitude of the field in each of the resonators, a beam of particles is passed through a tuned resonator with the RF generator turned off, the phase of the excitation Beam field in the resonator with respect to the selected reference signal, after which the RF generator is turned on and its phase is changed until the phase of the total field of the beam and the RF generator shifts relative to the field phase when the RF generator is turned off by the calculated value. Sources of information taken into account in the examination of icuirtis C.W-operation about NAL LiPas at energies mev, ProceedwgS oi -tVie -1970 Proton Liner aceterator Conferense, NAl., Spt, 28oce, v, gvatoNia ,, Noe, p 2- 17-. 2.cv-andaE.t K.Ri5 uep5opliz.l, 5i6e-conpEed Linacturn-on problem, Uos-M-avnoc Seientiiic boborcnto s, o, p .-) O.