Implementation of high-resolution spectroscopy for ion (and electron) temperature measurements of the divertor plasma in the Tokamak à configuration variable.

High resolution spectroscopy on the Tokamak à Configuration Variable (TCV) divertor plasma provided Doppler broadening measurements to infer the ion and neutral temperature of injected helium gas. This paper presents the Divertor Spectroscopy System's (DSS) access to He II ion temperature measurements over a broad range, ≈0.5-15 eV, with an uncertainty of <10% for most of the studied plasma discharges. TCV's shaping flexibility was employed to validate these measurements against Thomson scattering across the DSS lines of sight. In detachment-related experiments, Ti(He II) ≃ Te, making this diagnostic a reliable thermometer along the divertor leg plasma over the wide range of magnetic equilibria and divertor configurations achievable in TCV. A detailed description of the diagnostic hardware, data analysis, and sources of uncertainty is presented.

Development of an 11-channel multi wavelength imaging diagnostic for divertor plasmas in MAST Upgrade.

Divertor detachment and alternative divertor magnetic geometries are predicted to be promising approaches to handle the power exhaust of future fusion devices. In order to understand the detachment process caused by volumetric losses in alternative divertor magnetic geometries, a Multi-Wavelength Imaging (MWI) diagnostic has recently been designed and built for the Mega Amp Spherical Tokamak Upgrade. The MWI diagnostic will simultaneously capture 11 spectrally filtered images of the visible light emitted from divertor plasmas and provide crucial knowledge for the interpretation of observations and modeling efforts. This paper presents the optical design, mechanical design, hardware, and test results of an 11-channel MWI system with a field of view of 40°. The optical design shows better than 5 mm FWHM spatial resolution at the plasma on all 11 channels across the whole field of view. The spread of angle of incidence on the surface of each filter is also analyzed to inform the bandwidth specification of the interference filters. The results of the initial laboratory tests demonstrate that a spatial resolution of better than 5 mm FWHM is achieved for all 11 channels, meeting the specifications required for accurate tomography.

Real-time feedback control of the impurity emission front in tokamak divertor plasmas.

In magnetic confinement thermonuclear fusion the exhaust of heat and particles from the core remains a major challenge. Heat and particles leaving the core are transported via open magnetic field lines to a region of the reactor wall, called the divertor. Unabated, the heat and particle fluxes may become intolerable and damage the divertor. Controlled 'plasma detachment', a regime characterized by both a large reduction in plasma pressure and temperature at the divertor target, is required to reduce fluxes onto the divertor. Here we report a systematic approach towards achieving this critical need through feedback control of impurity emission front locations and its experimental demonstration. Our approach comprises a combination of real-time plasma diagnostic utilization, dynamic characterization of the plasma in proximity to the divertor, and efficient, reliable offline feedback controller design.

MANTIS: A real-time quantitative multispectral imaging system for fusion plasmas.

This work presents a novel, real-time capable, 10-channel Multispectral Advanced Narrowband Tokamak Imaging System installed on the TCV tokamak, MANTIS. Software and hardware requirements are presented together with the complete system architecture. The image quality of the system is assessed with emphasis on effects resulting from the narrowband interference filters. Some filters are found to create internal reflection images that are correlated with the filters' reflection coefficient. This was measured for selected filters where significant absorption (up to 65% within ∼70 nm of the filter center) was measured. The majority of this was attributed to the filter's design, and several filters' performance is compared. Tailored real-time algorithms exploiting the system's capabilities are presented together with benchmarks comparing polling and event based synchronization. The real-time performance is demonstrated with a density ramp discharge performed on TCV. The behavior of spectral lines' emission from different plasma species and their interpretation are qualitatively described.

Gastric duplication cyst.

BACKGROUND/AIM: The aim of this study is to evaluate the diagnostic and therapeutic difficulties of gastric duplication cysts. METHODS: A 38-year-old female patient presented with dyspepsia and repeated episodes of epigastric pain. She was operated with the diagnosis of pancreatic pseudocyst according to her US and CT scans, and found to have a gastric duplication cyst. A cyst about 80x80 mm, localized on the posterior wall of the corpus of the stomach close to the fundus, was dissected from the surrounding tissues and partially from the gastric wall. The cyst did not have muscle layer on the common wall with the stomach, so the cystic mucosa was stripped away from the gastric muscle layer. The gastric lumen was not entered. RESULTS: Although gastric duplication cysts do not have specific symptoms and signs, CT, MR and endoscopic ultrasonography may help the preoperative diagnosis, but the diagnosis is usually confirmed at laparotomy. Needle aspiration may cause complications. CONCLUSION: Because of the complications that may occur after needle aspiration and malignant potential of the tissue, the treatment of these cysts is surgical.

Management of a patient with hepatic-thoracic-pelvic and omental hydatid cysts and post-operative bilio-cutaneous fistula: a case report.

In humans, most hydatid cysts occur in the liver and 75% of these are single. Our patient was a 31 year-old male. His magnetic resonance imaging (MR) showed one cyst (15 x 20 cm) in the right lobe and three cysts (5 x 6 cm, 8 x 6 cm, and 5 x 5 cm) in the left lobe of the liver, two cysts (4 x 5 cm and 5 x 5 cm) on the greater omentum, and two cysts (15 x 10 and 10 x 10 cm) in the pelvis. The abdomen was entered first by a bilateral subcostal incision and then by a Phennenstiel incision. Partial cystectomy + capitonnage was done on the liver cysts; the cysts on the omentum were excised, and the pelvic cysts were enucleated. The cyst in the right lobe of the liver was in communication with a thoracic cyst. An air leak developed from the thoracic cyst which had underwater drainage and bile drainage from the drain in the cavity of the right lobe cyst. Sphincterotomy was done on the seventh post-operative day by endoscopic retrograde cholangiopancreatography (ERCP). No significant effect on mean bile output from the fistula occurred. Octreotide therapy was initiated, but due to abdominal pain and gas bloating the patient felt and could not tolerate, it was stopped on the fourth day; besides, it had no decreasing effect on bile output during the 4 days. Because air and bile leak continued and he had bile stained sputum, he was operated on on post-operative day 18. By right thoracotomy, the cavity and the leaking branches were closed. By right subcostal incision, cholecystectomy and T-tube drainage of the choledochus were done. On post-operative day 30, he was sent home with the T-tube and the drain in the cavity. After 3 months post-operatively, a second T-tube cholangiography was done, and a narrowing in the distal right hepatic duct and a minimal narrowing in the distal left hepatic duct were exposed. Balloon dilatation was done by way of a T-tube. Bile drainage ceased. There was no collection in the cavity in follow-up CT scanning, so the drain in the cavity, and the drainage catheter in the right hepatic duct were extracted. Evaluation of the biliary ductal system is important in bilio-cutaneous fistulas, and balloon dilatation is very effective in fistulas due to narrowing of the ducts.

Transhiatal esophagectomy for esophageal carcinoma in Turkey: with special reference to respiratory function.

Esophagectomy without opening the thoracic cavity--transhiatal esophagectomy--(THE) were performed in 47 patients with malignant tumors localized at various levels of the esophagus. Pulmonary function studies were performed in all patients and they are categorized as low, moderate, or high risk for probable postoperative pulmonary complications according to the risk category system. Nine of these patients were classified as high risk, seven as moderate risk, and the rest as low risk. In all patients but four, reconstruction was accomplished by using their stomachs as a substitute. In the remaining patient, intestinal continuity was established by a left and right colonic interposition. Three patients were lost in the early postoperative period. Two patients categorized as low risk died from pulmonary thromboembolism and cardiac failure, respectively. One patient categorized in the high risk group died of coronary thrombosis. Postoperative complications included transient hoarseness due to recurrent laryngeal nerve paresis in one patient, right pleural effusion in one patient, pneumothorax in two patients, and thrombophlebitis in one patient. In the high risk patient group, there were no pulmonary complications. This clinical study demonstrated the protective effect of THE in patients with serious pulmonary problems.

[Neoplastic transformation of a cyst in the thyroglossal tract. Apropos of a case]. / Cancérisation d'un kyste du tractus thyréoglosse. A propos d'un cas.

Cancers of the thyroglossal tract are very rare. Seventy-four patients with a cyst of the thyroglossal tract were operated in our hospital between 1978 and 1991. A papillary carcinoma was discovered on histological examination in one case. This cancer was treated by Sistrunk's operation. The patient had no sign of recurrence one five years after the operation. This paper presents the case report of this unusual cancer of which fewer than 100 similar cases have been reported in the literature.