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Abstract Among the peripheral instabilities observed at the Globus-M2 tokamak, two types of edge localized modes (ELMs) are brought into focus: ELMs synchronized and desynchronized with the sawtooth oscillations. The desynchronized ELMs appear in regimes that are characterized by high values of pressure in the pedestal, pped ≥ 3 kPa, and they are observed in discharges with the toroidal magnetic field BT > 0.6 T and plasma current IP > 0.3 MA. The desynchronized ELMs belong to the type-III/V with the dominating effect of the peeling mode. The synchronized ELMs were observed in a wider range of discharge parameters, including at BT < 0.6 T and IP < 0.3 MA. Calculations of the stability of the peeling-ballooning (PB) mode showed that at pedestal width ψnorm = 0.09 and pped > 3.5 kPa, destabilization of PB modes is possible without additional influence. Experimental data shows that the microtearing mode plays a dominant role in the pedestal. The microtearing mode does not allow the pedestal at Globus-M2 tokamak to reach the state of the unstable kinetic ballooning mode (KBM), which explains the low predictive power of the EPED model at this tokamak.

Abstract NBI-assisted plasma heating with one or two injectors of fast neutral atoms was studied at the Globus-M2 spherical tokamak at the toroidal magnetic fields of 0.8–0.9 T and plasma currents of 0.35–0.4 MA. Measurements of the spatial temperature and electron density distributions, performed using the Thomson scattering diagnostics, showed a twofold increase in heating of plasma electrons during the injection of neutral particles with energies of up to 45 keV at the beam power of 0.75 MW, as compared to the ohmic heating regime. Switching on the second additional beam with the particle energy of up to 30 keV and power of up to 0.5 MW resulted in obtaining the hot ion mode in the range of mean plasma densities of (1.6–10) × 1019 m−3. According to the data of active spectroscopy and neutral particle analyzer diagnostics, in the hot zone, the ion temperature reached 4 keV at the plasma density of 8 × 1019 m−3, which is more than 2.5 times higher than the electron temperature.

AIM: to estimate the outcomes after fistula laser coagulation for transsphincteric anal fistulas.PATIENTS AND METHODS: a prospective randomized single-center study included 42 patients with transsphincteric anal fistulas, 36 (85.7%) of them had a follow-up > 3 months. Nineteen patients were randomized to the group of laser thermocoagulation of the fistula track (diode laser 1560 nm) combined with ligation of intersphincteric fistula track (LC + LIFT). Seventeen patients were randomized to the group of laser thermocoagulation of the fistula combined with closure of internal fistula opening by advancement flap (LC + AF). Mean follow-up period was 6.5 months. Perioperatively (before surgery, 1 and 2 months after surgery), patients underwent ultrasound to assess fistula healing and early detection of recurrence.RESULTS: no intraoperative and early postoperative complications occurred. In the LC + LIFT group, healing rate was 89,5% (17/19 patients), in the LC + AF group — 64.7% (11/17patients). Endorectal ultrasound confirmed healing or early recurrence. No significant factors affecting recurrence rate were identified in both groups.CONCLUSION: treatment of transsphincteric anal fistulas by LC + LIFT showed better results compared with LC + AF technique. However, further recruitment of patients into study groups is required with evaluation of late results.

Families of dependences of the parameters of magnetic induction, permeability, susceptibility, and magnetization for cylindrical steel samples on the field strength H and the ratio of their length to diameter L/D are obtained. It is shown that the dependences of these parameters on L/D reach self-similarity regions (thereby proving the correspondence to the magnetic properties of the material) at different H-dependent L/D values, in contrast to the existing opinion. It is also shown that the range of L/D samples used in practice is characterized by an exponential relationship between their demagnetizing factor and L/D.

Rectal fistula – one of the most common coloproctological diseases. Annually, thousands of patients with anal fistula have had treated around the world. Treatment of this disease is an actual problem in coloproctology nowadays due to the high frequency of recurrence and anal incontinency. The chronic persistent perianal suppuration and multiple surgical interventions the main predictor of emergence of the anal incontinence, which could be achieve almost 50 %, according the literature data. The risk of emergence the anal incontinence is particularly high in the treatment of complex fistulas. Therefore, the problem of complex rectal fistulas treating remains an actual task in the clinical practice of a coloproctologist.

The article presents the results of studying the transfer of heat and particles in the Globus-M2 spherical tokamak in discharges with neutral injection at the current ramp up. An atomic beam was injected into the tokamak plasma at a fixed toroidal magnetic field of 0.7 T. The plasma current on the plateau was varied in the range 0.2–0.3 MA. Based on the electron temperature and concentration spatial distributions measured by the Thomson scattering method, the transport of heat and particles in plasma was simulated using the ASTRA code. The energy confinement time of the plasma was determined, as well as estimates of the coefficients of thermal diffusivity and diffusion was made.

Two algorithms for calculating the neutron yield of the Globus-M2 tokamak are considered for the case of anisotropic ion velocity distribution functions. Such calculations are necessary for estimating the neutron flux produced as a result of the interaction between fast particles (deuterons) arising from the injection of a high-energy atomic beam. The first algorithm comprises the calculation of the six-dimensional integral in the velocity space, and the second uses the expansion of the ion distribution function in Legendre polynomials, which allows one to reduce the dimension of integration. The results obtained using these algorithms are compared, and the advantages and disadvantages of both algorithms are discussed.

In this Letter, results of measurements of radiation losses Prad and effective ion charge Zeff in the conditions of magnetic field up to 0.7 T and plasma current up to 300 kA for a wide range of electron density first obtained on the Globus-M2 tokamak are presented. The analysis of the results shows the decrease in the radiation losses share of the input power on the Globus-M2 tokamak as compared with the same parameter for the Globus-M facility. A large dip at the center of the Prad power profiles is revealed. A decrease in the Zeff values is observed with an increase in electron density.

The clinical efficacy and safety of the use of percutaneous techniques in the treatment of kidney stones in 72 servicemen were studied. All percutaneous operations were performed by one operating team. It was found that percutaneous urolithiasis surgery was effective in 88.9% of people. Stone free rate was achieved in 83,8% of military personnel undergoing standard percutaneous nephrolitholapaxy and in 94.3% of patients undergoing minipercutaneous nephrolitholapaxy. With stones larger than 2 cm, the effect was observed in 81.8% of cases with standard surgery and in 96% of patients with mini-percutaneous approach. Percutaneous interventions in military personnel with stones larger than 2 cm were effective in 84,6% of patients with standard surgery and in 90% with mini-percutaneous access. Complications according to the Clavien-Dindo classification were found in 29,1% of servicemen: in 20,8% of cases of standard nephrolitholapaxy and in 8,3% of minipercutaneous nephrolitholapaxy. The bulk of the complications were Grade III 20,8%. Grade III IV were determined less frequently in 8,3% of cases. Urosepsis (Grade IV b) and death (Grade V) were not observed in our study. Duration of labor losses for conscripted servicemen were about 17 days, for contract servicemen when performing standard nephrolitholapaxy 12,8 days, for military personnel with minipercutaneous nephrolitholapaxy 11,2 days. The dismissal rate among conscripts was 18,2%. There were no contractual servicemen who were dismissed from the ranks of the Armed Forces of the Russian Federation, however, 14,7% of servicemen who underwent a standard operation and 11,1% of patients who underwent mini-percutaneous nephrolitholapaxy after surgery needed sick leave for a period of 15 days. In general, percutaneous techniques are common and effective methods of surgical treatment for military personnel suffering from urolithiasis. Mini-percutaneous approach for nephrolitholapaxy is safer than the standard approach, but it is less effective for coral calculi. Percutaneous methods for removing kidney stones are associated with a low rate of dismissal and short recovery times for military personnel.

On the spherical tokamak Globus-M2 in discharges with toroidal magnetic field of 0.7 T by means of magnetic probes and a number of other diagnostics during neutral beam injection at the current ramp up stage, magnetic field oscillations in the range of 100–300 kHz having their frequency increasing in time, had been observed. Eigenmodes with wavenumbers n = 1–3 and m = 2–4 were being registered. These oscillations were identified as Alfven cascades. By means of multi-channel fluctuation reflectometer, observed eigenmodes were found to be localized near the magnetic shear reversal radius. Application of MHD-spectroscopy technique allowed us to determine safety factor temporal evolution and experimental values are in well agreement with modelling results, provided by ASTRA transport code.

Background. The only radical curative treatment for rectal fistulae is surgery. The choice of surgery requires precise characterisation of the fistulous tract. The most common instrumental methods for rectal fistula diagnosis are transrectal ultrasonography (TRUS) and magnetic resonance imaging (MRI).Objectives. Comparative assessment of the diagnostic power of 3D TRUS and MRI techniques in revealing cryptogenic anal fistulae with respect to intraoperative examination.Methods. The study enrolled 92 patients with rectal fistulae aged 27 to 66 years. Fistulous opening was external in 47 (51.1%) and obliterated in 45 (48.9%) patients. The average patient age was 42.7 ± 15.9 years. Surgery for acute paraproctitis 14 to 32 days prior to examination was in history of 58 (63.1%) patients. All patients had preoperative subsequent 3D TRUS and MRI compared with intraoperative examination results.Results. The rate of correct fistulous tract type diagnosis verified with intraoperative revision was 96.7% (89/92) with 3D TRUS and 82.6% (76/92) with MRI (p = 0.0027). The error rate of 3D TRUS estimation of external sphincter involvement was 1.1% (1/92), sensitivity 96.6%, specificity 93.5%, overall accuracy 94.5%. The MRI error rate was 21.7% (20/92), with a statistically significant difference for sensitivity and overall accuracy (p < 0.0001). The rate of correct estimation of internal fistulous localisation in “anorectal clock” was 97.8% (90/92) with 3D TRUS and 90% (81/90) with MRI (p = 0.0342). Internal fistula was not detected with MRI in 2/92 (2.2%) cases, which explains the deviation. Intraoperative revision identified total 113 abscesses. The rate or correct abscess estimation was 97.3% (110/113) with 3D TRUS and 74.7% (71/95) with MRI. MRI failed to detect abscess in 18/113 (15.9%) cases (p < 0.0001).Conclusion. 3D transrectal ultrasonography is statistically superior over magnetic resonance imaging in estimating internal fistula localisation in “anorectal clock”, fistulous type, as well as the fistulous tract location relative to external sphincteric tissue in patients with transsphincteric anal fistulae. Estimation of pararectal and intramural abscesses was also significantly different.

The objective of the study was to compare the results of two methods of thermo-obliteration of the fistula track by diode laser or monopolar electrocoagulation in patients with trans- and suprasphincteric anal fistulas. Methods and materials . 52 patients (men - 40, women - 12) were included in the study. 29 patients underwent laser coagulation (Laser group) and 23 patients underwent monopolar electrocoagulation (ME group) of fistula track combined with closure of internal fistula opening. Mean age of patients in Laser group was (46±13) years, in ME group - (41±12) years. In the Laser group, 11 (38 %) patients had suprasphincteric fistulae, and 18 (62 %) had transsphincteric fistulae passing through a superficial or deep portion of the external anal sphincter. In the ME group, 9 (39.1 %) patients had an suprasphincteric fistula and 14 (60.9 %) had a transsphincteric fistulae. The minimal period for assessing the healing rate was 2 months after surgery. Results. The average follow-up period after Laser was (9.5±3.0) (5-18) months, after ME - (12.2±7.3) (2-22) months. Primary healing of fistula in 2 months after surgery was 19/29 (65.5 %; 10 transsphincteric and 9 suprasphincteric fistulas) in the Laser group versus 7/23 (30.4 %; 5 transsphincteric and 1 suprasphincteric fistulas) in the ME group (p

Introduction. In modern scientific literature it is becoming increasingly popular to study Quality of Life (QoL) index as an integral indicator of the entire therapeutic complex. QoL along with physical examination, laboratory and instrumental tests allows a doctor to fully assess patient’s condition. That is why the QoL researches has been recently become more and more widespread in the scientific papers. Aim. The aim of this study was to determine applicability of the Wisconsin Stone Quality of Life Questionnaire (WISQOL) and the SF-36 General Questionnaire for evaluating treatment outcomes and postoperative follow-up in patients with ureterolithiasis. Materials and methods. 123 patients with diagnosed urolithiasis (ureteral stone) were included in the study. Clinical efficacy of the shock wave lithotripsy (SWL) and contact (laser) ureterolithotripsy (CLT) was assessed after 1 week, 1 and 3 months using stone free rate (SFR). To analyze clinical factors influencing patients QoL, differences in the WISQOL and SF-36 total scores and scores before and after treatment were compared. At the third step, the dynamics of QoL indicators at different stages of treatment was analyzed. Results. The SFR at 1 week, 1 and 3 months after SWL and CLT were 47,1%, 58,8%, 72,5% and 6,4%, 84,7, 93,1% respectively. Gender, age, stone size and the Stone Free Rate achieved during treatment had a significant effect on QoL (p

Relevance. In 2013, the Wisconsin Stone Quality of Life Questionnaire (WISQoL) was developed a specific tool for assessing the quality of life (QoL) in patients with urolithiasis. Aim. To determine the possibility of using the WISQoL and SF-36 questionnaires to study the treatment results of patients with kidney stones. Materials and methods. The study included 218 patients with nephrolithiasis. Patients were divided into 2 groups: the first the size of the stone up to 10 mm and the second from 11 to 20 mm. At the first stage, the efficacy of treatment patients by the extracorporeal shock wave lithotripsy (ESWL) and percutaneous nephrolitholapaxy (PNL) 1 week, 1 and 3 months after surgery was compared. Questionnaires were used to study factors affecting the QOL of patients, including: gender, age, number, density and size of stones, hydronephrosis, stone free rate (SFR), type of surgery. At the next stage, the dynamics of changes in scores for the domains of questionnaires at different stages of treatment was evaluated. Results. The efficacy of treating kidney stones up to 1 cm in size after 3 months with ESWL was 86,1% and PNL 94,4 %, while stones up to 20 mm using ESWL 73,4% and percutaneous techniques 90,6%. Gender, age, stone size, SFR affected the QoL of patients with nephrolithiasis, while the number and density of stones, the presence of hydronephrosis and the type of operation were not significant. Patients 1 week after PNL had lower QoL scores in the domains of social impact and impact on vitalyty of WISQoL and mental heals of SF-36. After 1 month, these changes were determined only in the social impact domain and completely regressed by the 3rd month. Conclusion. SFR after ESWL and PNL in the first group is comparable, in the second group, percutaneous operations were 17,2% more effective. Male gender, age up to 40 years, stone size more than 1 cm, and also not reached SFR negatively affects patients with nephrolithiasis. Compared with ESWL and PNL is accompanied by the worst dynamics of QOL scores only 1 week after the operation; upon further observation, negative changes are leveled.

Globus-M2—a new 1-Tesla spherical tokamak—was recently launched. The main features and research directions of this machine in scope of fusion–fission reactor development are described. Main results of the first experimental campaign with toroidal magnetic field up to 0.73 T and plasma current up to 0.33 MA are discussed. Significant improvement of the discharge parameters as compared to Globus-M was achieved. Plasma total stored energy higher than 7 kJ was obtained. Energy confinement time increase was consistent with predictions by spherical tokamak scalings. Toroidal Alfven eigenmode-induced losses decrease with increase of plasma current and toroidal magnetic field. For the first time, LHCD with the toroidal wave slowing-down was successfully used at a spherical tokamak.

Investigation of the 7H-system in the experiment conducted at the fragment separator ACCULINNA-2 in the 8He(2H,3He)7H reaction requires to detect the recoil 3He ions with energy down to 6 MeV. For this purpose two $$\Delta E{\text{—}}E$$ particle telescopes are used, with each telescope having in front a thin (20-μm) Si strip detector ($$\Delta E{\text{—}}SSD$$). The maps of thickness heterogeneity of the thin detectors were determined by measuring the energy losses of the 226Ra α-particles. The adopted thickness normalization method provides a good identification of the 3He nuclei being recorded in the presence of a high 4He background. Two approaches were used for calculating the energy losses of the identified 3He and 4He reaction ejectiles and reconstructing their energy values available at the exit from the deuterium target. The developed techniques were applied for the 7H missing-mass reconstruction.

Congenital heart defects (CHDs) are recognized as the most common type of congenital pathology. The frequency of CHDs reaches 2.4–14.2 % per 1 000 newborns. Ebstein’s anomaly is a rare and complex pathology that can be manifested clinically at any age. Drug treatment is ineffective in patients with this pathology. Preference in this case should be given to surgical treatment. Cardiac surgeons must know basic methods of correction of this pathology, their advantages, and disadvantages. The literature review shows the evolution of Ebstein’s anomaly surgical correction techniques from the middle of the XX century to the present moment. The description of the main tricuspid valve repair techniques, which had an impact on the development of Ebstein’s anomaly surgery, is given. The volume of flap tissue that can be separated from the wall of the right ventricle is the key to successful valve repair. A case of tricuspid valve repair and replacement is given. “Cone” reconstruction is the most promising modern technique. There is also a need in new techniques and modification of the existing ones. The works aimed at their improvement and elimination of imperfections are promising.

This clinical case demonstrated surgical management for a rare case of vascular ring associated with an elongated and kinked aortic arch and a right descending aorta in a ten-year-old male using an extra-anatomic bypass grafting method and dividing the vascular ring. Computer tomography performed at six-month follow-up showed a favorable surgical outcome.

An analysis has been made of field experimental dependences of the magnetic susceptibility of low-concentration colloids with different values of concentration of the dispersed phase of particles (magnetite). An attempt has been made to generalize them to a single dependence in coordinates in which the ordinate is the concentration-rated susceptibility and thus to determine the magnetic susceptibility of individual particles. It has been shown that the obtained results significantly exceed maximum permissible ones. Furthermore, there is contradiction in them (in using data for one and the same colloid, but with a different concentration of the dispersed phase). This is due to the formation of chains and aggregates of particles. Thus, to determine the magnetic susceptibility of dispersed phase particles, it is necessary to use "hard" dispersed samples, in particular, two-fraction powder samples (with addition of a passive fraction), which ensures the fixation of the dispersed phase particles. Examples have been given of concentration dependences of the magnetic susceptibility of powder samples (with a dispersed phase of magnetite particles), and also of ferro-impurity particles of sugar sand and farina. These dependences having characteristic linear portions make it possible to obtain data on the magnetic susceptibility of individual ferroparticles.

A new readout system for strip semiconductor detectors has been developed based on a dedicated IDE1140 chip. The system consists of 64 spectrometric channels that provide readout of signals from detector strips. The source of the trigger signal can be either an external signal or a detector that measures the passage of an ionizing particle through the strips. The amplitude of the signal from this detector can also be used for particle spectrometry. The control and signal-readout unit for the IDE1140 chip has been designed on an EP3C16Q240 field-programmable gate array and is used for processing, storage, and transfer of acquired data. The main characteristics of the system are presented: the integral nonlinearity is

Differential cross sections for elastic $p\text{\ensuremath{-}}^{6}\mathrm{He}$ and $p\text{\ensuremath{-}}^{8}\mathrm{He}$ scattering, measured in inverse kinematics at high momentum transfer up to the first diffraction minimum and at projectile energies around 700 MeV/u at GSI Darmstadt, are analyzed applying the sum-of-Gaussians (SOG) method based on the Glauber multiple-scattering theory. The rms point matter radii of $^{6}\mathrm{He}$ and $^{8}\mathrm{He}$ are deduced to be 2.29(6) fm and 2.53(7) fm, respectively, in close agreement with those from former analyses using phenomenological parametrizations for describing the matter distributions. With the aid of the measurement at high momentum transfer, the overall radial density distributions of $^{6}\mathrm{He}$ and $^{8}\mathrm{He}$ are precisely deduced using the SOG method, in particular at small radii. A pronounced core rearrangement by adding the valence neutrons to an $\ensuremath{\alpha}$-like core to form $^{6}\mathrm{He}$ and $^{8}\mathrm{He}$ is elucidated, and briefly discussed.

The development of the physicochemical basis for applications of nanoradiosensitizers for targeted treatment of tumors is one of the crucial issues of modern radiotherapy. Ceramic nanoparticles (NPs) composed of heavy metal oxides are considered as prospective sensitizers, particularly for X-ray treatment. This study reports a novel approach for experimental simulations of the radiosensitizing effect of NPs in biomimetic systems based on the quantification of radicals produced from organic components in concentrated aqueous organic solutions using the spin-trapping technique with electron paramagnetic resonance detection. This approach was first applied to X-ray irradiation (45 kVp) of aqueous methanol solutions systems containing different concentrations of hafnium oxide nanoparticles with an average diameter of ca. 84 nm (up to 1.8 wp). It was found that the amount of radicals produced from methanol at the same exposition time increased linearly with the increasing content of HfO2 NPs. The effect can be...

Studies of radioactive ions (RIs) are the most thriving field of low-energy nuclear physics. In this paper, the concept and the scientific agenda of the prospective accelerator and storage ring facility for RI beam (RIB) research are proposed for a large-scale international project based at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research. The motivation for the new facility is discussed and its characteristics are briefly presented and shown to be comparable to those of advanced world centers, the so-called “RIB factories”. In the project, the emphasis is made on studies with short-lived RIBs in storage rings. A unique feature of the project is the possibility of studying electron–RI interactions in a collider experiment to determine the fundamental properties of nuclear matter, in particular, electromagnetic form factors of exotic nuclei.

Nanostructured drugs are being approved for clinical use, although there is a serious deficit of systematic studies of these materials. Data on toxicity of nanoparticles (NPs) can vary due to different methods of preparation, size, and shape. We investigated the toxicity against cultured human cells, the acute toxicity in mice, and the influence on conjugative transfer of antibiotic resistance genes of clinically relevant NPs such as TiO

The actual tasks of 3D-reconstruction of the industrial-urban environment and navigation models are considered by solving the identification of textured linear objects in the process of movement according to the onboard complex and technical vision system consisting of a mutually adjusted 3D laser sensor and a video camera with a common viewing area. For a complete solution of the navigation task (determination of three linear and three angular coordinates of the control object), it is necessary to select and identify at least three mutually non-parallel flat objects in the process of moving in a sequence of point clouds formed by a 3D laser sensor. In the case of the allocation of less than three flat objects (for example, in environments subjected to destruction), the navigation problem is not fully solved (not all coordinates are determined unambiguously, and some coordinates are related by linear or non-linear dependencies). In these cases, it is proposed to additionally use the texture of the selected flat objects formed by the video camera. In the paper is given the analysis of the features of the solution of the navigation problem is carried out depending on the number of allocated and identifiable textured linear objects in the current integrated images and algorithms for solving the navigation problem are evaluated for selecting and identifying the process of movement of one textured linear object and of two textured non-parallel linear objects. It is shown that in the first case, the use of texture makes it possible to reduce the solution of the navigational problem to a three-dimensional one, and in the second case to a one-dimensional optimization problem (finding the global optimum of a functional three and one variable, respectively). The proposed algorithms for processing complexed images provide a complete solution to the navigation task even if less than three linear objects are selected, which significantly increases the reliability of solving the navigation task and building an environmental model even in industrial-urban environments that have been destroyed, and therefore, the reliability and survivability of the ground ones and airborne robotic tools in autonomous modes of movement. The results of the corresponding software and hardware solutions in real industrial-urban environments, confirmed the accuracy and effectiveness of the proposed algorithms.

The results of experiments and simulations of the transport of heat and particles in the Globus-M spherical tokamak are presented. Investigations were carried out in the ohmic mode in hydrogen and deuterium plasma. It is shown that in the phase of current growth under the same initial conditions, as long as the condition is met at which the minimum of the safety factor exceeds unity, two scenarios of discharge development are possible: with an electron temperature dive or with an electron density peak. After the safety factor reaches the value of 1, the differences are no longer observed. Modeling of transport processes using the ASTRA code showed that the dive of the electron temperature and density is a consequence of the decrease in the transport of heat and particles in the plasma core (i.e., the presence of internal transport barriers).

The article presents research on neutral beam current drive in Globus-M compact spherical tokamak. The experiments were performed in the plasma current range of 0.17–0.20 MA with a 0.4- or 0.5‑T toroidal magnetic field. The injection impact parameter was 33 cm. The variable parameters included compositions of plasma and the heating beam (hydrogen, deuterium), plasma density, and vertical displacement of the plasma column. The simultaneous increase in the plasma current and drop in the loop voltage were used to determine the neutral beam current drive. The injection of a hydrogen/deuterium beam into deuterium or hydrogen plasma resulted in a significant and reproducible drop in the loop voltage (up to 0.5 V). In order to process the obtained data, the authors developed an ASTRA code-based model, which allows one to calculate the neutral beam-driven current and bootstrap current. The share of noninductive currents as a function of plasma density during the injection of a hydrogen beam (28 keV, 0.5 MW) into the deuterium plasma was calculated. The authors analyze the results of experiments on off-axis beam injection achieved by vertical displacement of the plasma column and the effect of increasing the toroidal magnetic field on the consumption of the poloidal magnetic flux in discharges with atomic beam injection.

Experimental coordinate characteristics of magnetic field induction and its gradient are obtained between pole pieces of Faraday balance electromagnetic system. Pole pieces have spheric form that is preferable by possibility of obtaining area with a stable gradient as a working area for specimen’s positioning. Alternative characteristics which are obtained by modeling at the program COMSOL Multiphysics are shown using the same values of supply current and distance between pole pieces as at the experiment. It is shown that together with qualitative commonality of model and experimental characteristics difference of its data at the working area are up to 11 % (by induction), 24 % (by gradient), hereby testify about probable error of conclusive result which is up to 35 %, and up to 5 % by coordinate of gradient extremum. Questions about determining correction factor are discussed (normalizing factor for model characteristic); at its proved value equals 0,86 (e.g. at starting exclude of 14 % «systematic» error, probably obtained at the case of using results after modeling) a differences of mentioned data are up to 4, 5, 5% accordingly.