NSTU NETI student receives the Russian Academy of Sciences medal and prize in nuclear physics

Kristina Grishina, NSTU NETI student, received the medal of the Russian Academy of Sciences with the prize for young scientists and students in the 2019 contest in nuclear physics for her work at the mega-science installation, the shared research center "SKIF synchrotron radiation source", a 4+ generation of synchrotron radiation source with an energy of 3 GeV, which requires an injection system for particles acceleration to the energy of 200 MeV.

NSTU NETI student receives the Russian Academy of Sciences medal and prize in nuclear physics

NSTU NETI student receives the Russian Academy of Scienniversity NETI postgraduate, Physical Engineering Faculty, and senior laboratory assistant at BINP SB RAS. The injector of the future Siberian ring photon source is an electronic high-frequency gun, a beam grouping system and regular accelerating sections. It is in this last element of the injection system (the accelerating structure) that the main acceleration to 200 MeV energy will occur.<br>
<br>

BINP SB RAS experts have developed a stand to determine precisely what energy the accelerating structures will be able to accumulate and what parameters they should have. All the necessary measurements were taken at this stand. The investigated element of the injection system is a three-meter diaphragm-type waveguide with an electromagnetic field inside, which is suitable for beam acceleration.

"Our stand has been assembled on the basis of the structure that remained after the development of VEPP-5 BINP SB RAS injection complex," says Kristina Grishina. "The parameters of the accelerating structure "old" version (its phase and group velocity, coupling coefficient, etc.) were measured a long time ago. We started measuring these parameters to clarify whether using such structures in the SKIF synchrotron radiation source injection system will give the necessary level of acceleration. We also needed to understand how to modify them, if necessary".

The main data were obtained at the measuring stand created at the BINP SB RAS, which includes a stepper motor to stretch the disturbing body, a controller for the stepper motor, an S-parameter analyzer and a cable track.

"When forming necessary beam parameters, we can always have some drift in energy, so it can be less or more than the specified parameters", adds Kristina Grishina. "Doing this work we have established how the error in the phase incursion affects the beam formation drift, and the reason of the error is the different radius of the accelerating structure cells. That is, because of the different radius of the cells, we lose the energy of the beam". According to Grishina, it is impossible to make all the cells (about 400) identical. "But we can correct the radius of each cell by adjusting the frequency. Special platforms will compress the cell, deforming its geometry, thus changing the frequency", explains Kristina.

The measurements have shown that the accelerating structures of the injection system will be able to achieve the energy level that meets the project parameters.

"Now we have the data about the energy we can really obtain," says Alexey Levichev. "The project of accelerating structures has been approved for production and is already being manufactured." The scientist also noted that a part of the work on the accelerating structure parameters measuring was carried out by NSTU NETI student. This work is very important in the view of staff training for SKIF synchrotron radiation source and other ambitious projects. "We need young specialists who will be able to participate in the manufacture, launch and operation of the fourth generation SR source," adds Alexey Levichev.

Back to news list