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Description
A high-voltage negative ion based neutral beam injector is under construction at the Budker Institute of Nuclear Physics [1]. It consists of the negative ion source, of the low-energy beam transport section (LEBT) to purify the beam before the acceleration, of the multi-electrode single-aperture beam accelerator and of the plasma neutralizer and beam magnetic separator with beam energy recuperators. The test stand for study of the main injector components, consisting of ion source and LEBT, installed at the HV platform and of accelerator section with HEBT was physically launched in 2019. A negative ion beam production and transport through LEBT to the input of the accelerator tube was studied before [2]. In the first half of 2020 the initial beam acceleration to energy up to 180 keV and the accelerated beam transport through the HEBT section with the quadrupole lenses were tested. The parameters of the transported beam were measured by the secondary emission detectors, installed at different points of the beam line and by the beam calorimeter, installed at the beam line exit in 10 m from the source. The power load to the acceleration tube electrodes was measures. The efficiency of the beam transport vs various source and LEBT parameters will be presented and discussed.
[1]. A.A. Ivanov, G. Abdrashitov, V. Anashin, et.al., Rev. Sci. Instrum., 85, 02B102 (2014);
[2]. A. A. Ivanov, Yu. Belchenko, P. Deichuli, A. Sanin, and O. Sotnikov. AIP Conf. Proc., 1771, 030012 (2016).
