Author: D. W. JohnsonPublisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
Radiation Shielding for TFTR DT Diagnostics
Author: D. W. JohnsonRadiation Shielding for TFTR DT Diagnostics
Author: D. W. JohnsonReview of Diagnostic Methods for TFTR D-T Radiation Shielding and Neutronics Studies
Author: H. W. KugelPublisher:
ISBN:
Category : Radiation
Languages : en
Pages : 13
Book Description
Review of Diagnostic Methods for TFTR D-T Radiation Shielding and Neutronics Studies
Author: H. W. KugelPublisher:
ISBN:
Category : Radiation
Languages : en
Pages : 13
Book Description
Measurements of TFTR D-T Radiation Shielding Efficiency
Author: H. W. KugelPublisher:
ISBN:
Category : Radiation
Languages : en
Pages : 24
Book Description
D-T Radiation Effects on TFTR Diagnostics
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
For a 50%-50% deuterium-tritium plasma, the neutron production is 80× higher and the total energy release is 200× higher than the same plasma composed only of deuterium. With this increase in radiation, diagnostics which see only negligible amounts of noise during DD operation may find themselves overwhelmed during DT. The neutrons are not only more numerous, but have 6× as much energy, which causes the calculated 2.4× increase in the gamma flux per neutron near TFTR. We report here the effects of this increased radiation on the TFTR diagnostic set. The most noticeable effects are luminescence and transmission losses in fiber optic signal cables. In addition, a plastic fiber near the torus became unusably opaque after a few DT discharges. Silicon detectors show signs of neutron interactions as well as gamma response, and microchannel electron multipliers show an increased background due to the gamma flux. Bolometers show n and [gamma] heating, and the Thomson scattering intensifier gate spark gap was unreliable until the gas pressure was adjusted. All of these effects were anticipated, and in some cases shielding or compensation techniques were used. Compensation fibers work satisfactorily at these radiation levels, and the rapid fall-off of the radiation as one moves away from the machine makes relocation of fibers and other sensitive components very useful. Conventional shielding designs worked when streaming through signal penetrations was properly dealt with. In coming DT campaigns and the generation of new tokamaks, such problems will be more severe. JET anticipates higher dose levels per shot during DT; TPX has 1000 s pulses and ITER presents a particularly difficult challenge. We shall discuss the implications of our results for diagnostics on these machines.
Measurements of TFTR D-T Radiation Shielding Efficiency
Author: H. W. KugelPublisher:
ISBN:
Category : Radiation
Languages : en
Pages : 24
Book Description
D-T Radiation Effects on TFTR Diagnostics
Author: Alan T. RamseyPublisher:
ISBN:
Category : Fiber optics
Languages : en
Pages : 16
Book Description
X-ray Diagnostics for TFTR.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A short description of the x-ray diagnostic preparation for the TFTR tokamak is given. The x-ray equipment consists of the limiter x-ray monitoring system, the soft x-ray pulse-height-analysis-system, the soft x-ray imaging system and the x-ray crystal spectrometer. Particular attention is given to the radiation protection of the x-ray systems from the neutron environment.
Author: