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The vacuum vessel is subdivided into four (4) sectors or quadrants, corresponding to the 4-fold symmetry of the machine (each sector being essentially identical). The enumeration of the sectors or quadrants (A through D) is shown in the top view of the machine. | The [[TJ-II:Vacuum system|vacuum vessel]] is subdivided into four (4) sectors or quadrants, corresponding to the 4-fold symmetry of the machine (each sector being essentially identical). The enumeration of the sectors or quadrants (A through D) is shown in the top view of the machine. | ||
Each sector is subdivided into eight segments. | Each sector is subdivided into eight segments. | ||
Each segment has two or three viewports, labelled 'TOP', 'BOTTOM', or 'SIDE'. | Each segment has two or three viewports, labelled 'TOP', 'BOTTOM', or 'SIDE'. |