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GOLEM is a limiter tokamak with circular poloidal cross-section and with an iron transformer core. It has 18 diagnostic ports and it is equipped with basic controls and diagnostics. Main parameters are as follows:

It is a device with full remote control capability and being operated mainly for an educational purpose.

The experiment is composed from the following principal parts (see Fig. [fig:EngSetupL1]):

Circuit for generation of a toroidal magnetic field consisting of a capacitor bank (\(C_B = 24.3\) mF) charged up to \(U_{C_B}=2\) kV, which is triggered by PC controlled thyristor into a set of 28 magnetic field coils to generate a toroidal magnetic field up to \(B_t\approx 0.8\) T.
Circuit for generation of a toroidal electric field for ohmic current drive and heating (\(C_{CD} = 10.8\) mF , \(U_{C_{CD}} \le 400\) V). Discharge of capacitor bank is triggered by PC controlled thyristors into primary winding of the transformer. The time delay with respect to the magnetic field \(\tau_{CD}\)) can be independently selected.
Circuit for generation of a toroidal electric field for breakdown (\(C_{BD} = 10.8\) mF , \(U_{C_{BD}} \le 400\) V). Discharge of capacitor bank is triggered by PC controlled thyristors into primary winding of the transformer. The time delay with respect to the magnetic field \(\tau_{BD}\)) can be independently selected.
Pre-ionization of the working gas is performed by an electron gun.
Gas handling system (again computer controlled) to control the pressure of the working gas (hydrogen) in the vessel in the range of \(p_{H_2}\) \(\approx\) 10 - 200 mPa.
Vacuum system, which allows reaching the background pressure \(\approx 0.5\) mPa.