TFTR (Tokamak Fusion Test Reactor) neutral beam injected power measurement

Technical Report · Mon May 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/6135324· OSTI ID:6135324

Kamperschroer, J H; Grisham, L R; Dudek, L E; Gammel, G M; Johnson, G A; Kugel, H W; Lagin, L; O'Connor, T E; Shah, P A; Sichta, P

Energy flow within TFTR neutral beamlines is measured with a waterfall calorimetry system capable of simultaneously measuring the energy deposited within four heating beamlines (three ion sources each), or of measuring the energy deposited in a separate neutral beam test stand. Of the energy extracted from the ion source in the well instrumented test stand, 99.5 +- 3.5% can be accounted for. When the ion deflection magnet is energized, however, 6.5% of the extracted energy is lost. This loss is attributed to a spray of devious particles onto unmonitored surfaces. A 30% discrepancy is also observed between energy measurements on the internal beamline calorimeter and energy measurements on a calorimeter located in the test stand target chamber. Particle reflection from the flat plate calorimeter in the target chamber, which the incident beam strikes at a near-grazing angle of 12/degree/, is the primary loss of this energy. A slight improvement in energy accountability is observed as the beam pulse length is increased. This improvement is attributed to systematic error in the sensitivity of the energy measurement to small fluctuations on the supply water temperature. An overall accuracy of 15% is estimated for the total power injected into TFTR. Contributions to this error are uncertainties in the beam neutralization efficiency, reionization and beam scrape-off in the drift duct, and fluctuations in the temperature of the supply water. 28 refs., 9 figs., 1 tab.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6135324
• Report Number(s): PPPL-2621; ON: DE89013350
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
BEAM INJECTION
BEAM INJECTION HEATING
BEAMS
CALORIMETRY
CAMAC SYSTEM
DATA ACQUISITION SYSTEMS
DEUTERON BEAMS
ENERGY LOSSES
HEATING
ION BEAMS
ION SOURCES
LOSSES
NEUTRAL ATOM BEAM INJECTION
PLASMA HEATING
POWER LOSSES
TEMPERATURE MEASUREMENT
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
WAVE FORMS