Optical design study of an infrared visible viewing system for Wendelstein 7-X divertor observation and control.

For the Wendelstein 7-X stellarator, which will allow quasicontinuous operation (tau < or = 30 min) with 10 MW of electron cyclotron radiation heating power, a conceptual design study for an IR/visible viewing system (IVVS) has been elaborated. Ten such systems, as part of the machine protection system, will be required for real time monitoring of all ten discrete, water cooled divertor modules with high spatial (< 10 mm) resolution, in order to prevent local overheating of the target tiles, which could easily lead to their destruction. On the physics side, the systems will be used for divertor symmetry investigations by studying the power load distribution on all targets modules and by observing the island divertor plasmas in the light of H alpha, C II, and C III using the visible imaging section of the systems.

Heredo-ataxia in a large Dutch pedigree. M.R.I. findings.

One segment of a large Dutch pedigree with heredo-ataxia is presented. The clinical and genetic features of the disease, together with the M.R.

An unusual CT-scan appearance in multiple sclerosis.

Case report on a woman aged 28 years with acute multiple sclerosis. At presentation the symptoms were few and mild: frontal headache with occasional vomiting, slight speech-difficulties, increased sleepiness and slight disorientation with confusion. CT scanning revealed multiple, ring-forming hypodense lesions throughout both cerebral hemispheres suggestive of metastases.

Automatic detection and localization of epileptic foci.

A new method of automatic EEG analysis (ASD or automatic non-stationarity detection) derived from a parametric EEG model (autoregressive filter model) and based on inverse filtering, has been applied to scalp and subdural EEGs of epileptic patients. By this method it was possible to detect the occurrence of transient non-stationarities such as paroxysmal patterns of activity (spikes, spike-and-waves) characteristic of inter-ictal EEGs. The ASD has been implemented in a general purpose digital computer.

Sequential frequency analysis: a method to quantify event related EEG changes.

A hybrid method of frequency analysis is described by means of which EEG changes related to stimulus-response tasks have been studied. Frequency analysis was carried out using a bank of 20 analog filters by means of which quantitative spectral data were obtained as a function of time. Storing, averaging and statistical analysis of these time-varying spectral data were performed, using a general purpose computer (PDP 11-20).