| Term | Definition |
|---|---|
| q-value | A magnetohydrodynamic safety factor describing the number of times field lines need to pass round the major circumference of the plasma before they close around the minor circumference; q=(R/a)(BT/BP) |
| QA | quality assurance |
| QC | quality control |
| QM | quality management |
| quality assurance | QA, all those planned and systematic actions necessary to provide assurance when a facility, structure, system or component will perform satisfactorily and safely in service. The prevention of defects. |
| quality control | QC, all actions necessary to verify conformance to requirements, and to control nonconformities or deficiencies. Quality Control is an inspection function, the detection and control of deficiencies. |
| quench | See quench time. Also, the procedure by which a superconducting magnet starts behaving as a normal conductor with resistive heating, usually due to a source of local heating or poor coolant flow. The magnet quench is handled by a discharge system to remove the magnetic energy as fast as is prudent. |
| quench time | Usually, the time needed to extinguish the plasma current. |
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