| Term | Definition |
|---|---|
| OD | outside diameter |
| ohmic heating | OH, heating resulting from the resistance a medium offers to the flow of electric current. In a plasma subjected to ohmic heating, ions are heated almost entirely by the transfer of energy from the hotter electrons. |
| ohmic heating system | OH system, resistive heating in a tokamak by use of an induction coil. |
| operating margins | Each parameter describing an operating system has a nominal value and a limiting one at which operation would cease or otherwise be deficient. The differences between the nominal parameter values prevailing and the limiting ones are referred to as “operating margins” |
| operating parameter | An algebraic magnitude characterizing the plant or a component operating state,e.g., temperature (t), fusion power (P), electrical current (I) and magnetic field (B). |
| operating point | A point in n-dimensional space, where each dimension measures the value of a key operating parameter, identified with a particular type of operation. |
| operating space | The set of valid operating points in n-dimensional operating parameter space. |
| operating state | When the plant or component is in operation. The plant is in operating state during the entire pulse length. |
| operating time | The sum of pulse lengths achieved within a certain calendar time at normal and abnormal operation. |
| operation availability | See “availability” |
| operational domain | see “operating space” |
| operational limits and conditions |
A set of rules establishing ITER parameter limits, the functional capability and the performance level of its equipment and personnel for safe operation. |
| operational reliability | The probability that a system will perform as specified when used in the manner and for the purpose intended. |
| outboard | A region located further away from the tokamak vertical centreline than the object referred to. |
| overturning moment | Toroidal field coil moment (in a tokamak) about the device radius from out of plane forces arising from vertical fields and from the plasma field. |
To add a definition, correct an existing one or to request a definition.