Conceptual design and performance predictions for 2D beam emission spectroscopy turbulence measurements at Wendelstein 7-X.

A conceptual design for a 2D beam emission spectroscopy diagnostic system to measure ion gyro-scale plasma turbulence at Wendeslstein 7-X is described. The conceptual design identifies field-aligned viewing geometries and ports for cross-field turbulence measurements in the neutral beam volume. A 2D sightline grid covers the outer plasma region, and the grid configuration provides sufficient k-space coverage in radial and poloidal directions for ion temperature gradient and trapped-electron mode turbulence measurements. Emission intensity estimates, optical transmission losses, and detector noise levels indicate that the measurements will be sensitive to plasma density fluctuations as small as δn/n ≈ 0.5% with a bandwidth of 1 MHz. Implementation challenges include a small beam emission Doppler shift due to nearly radial heating beams and reduced optical throughput due to collection aperture limitations.

Correction and verification of x-ray imaging crystal spectrometer analysis on Wendelstein 7-X through x-ray ray tracing.

X-ray ray tracing is used to develop ion-temperature corrections for the analysis of the X-ray Imaging Crystal Spectrometer (XICS) used at Wendelstein 7-X (W7-X) and perform verification on the analysis methods. The XICS is a powerful diagnostic able to measure ion-temperature, electron-temperature, plasma flow, and impurity charge state densities. While these systems are relatively simple in design, accurate characterization of the instrumental response and validation of analysis techniques are difficult to perform experimentally due to the requirement of extended x-ray sources. For this reason, a ray tracing model has been developed that allows characterization of the spectrometer and verification of the analysis methods while fully considering the real geometry of the XICS system and W7-X plasma. Through the use of ray tracing, several important corrections have been found that must be accounted for in order to accurately reconstruct the ion-temperature profiles. The sources of these corrections are described along with their effect on the analyzed profiles. The implemented corrections stem from three effects: (1) effect of sub-pixel intensity distribution during de-curving and spatial binning, (2) effect of sub-pixel intensity distribution during forward model evaluation and generation of residuals, and (3) effect of defocus and spherical aberrations on the instrumental response. Possible improvements to the forward model and analysis procedures are explored, along with a discussion of trade-offs in terms of computational complexity. Finally, the accuracy of the tomographic inversion technique in stellarator geometry is investigated, providing for the first time a verification exercise for inversion accuracy in stellarator geometry and a complete XICS analysis tool-chain.

Phased array Doppler reflectometry at Wendelstein 7-X.

A passive phased array Doppler reflectometry system has recently been installed in the Wendelstein-7X stellarator. In contrast to conventional Doppler reflectometry systems, the microwave beam can be steered on short time scales in the measurement plane perpendicular to the magnetic field in the range of ±25° without mechanical steering components. This paper characterizes the design and properties of the phased array antenna system and presents the first measurement results from the latest OP1.2a campaign.

[Infiltration of the superior vena cava in NSCLC: results of surgical intervention]. / Ergebnisse des chirurgischen Vorgehens bei NSCLC und Infiltration der Vena cava superior.

The benefits of surgical therapy of locally advanced non-small cell lung cancer (NSCLC) with infiltration of the superior vena cava (SVC) remains controversial. Here we describe our therapeutic approach and results of our intervention.A retrospective analysis of 22 patients with NSCLC who underwent SVC replacement (n = 17) or reconstruction (n = 5) between 1998 and 2013 was performed. Pneumonectomy was necessary in 16 patients, lobectomy in 8. Preoperative chemotherapy was administered to 3 patients, 16 received postoperative radiation treatment. The clinical course and survival were analyzed.Major postoperative morbidities were found in 13 patients. Graft thrombosis did not occur. Thirty-day mortality was 7 % in pneumonectomy patients and 0 % following lobectomy. Local recurrence was found in 4.5 %, distant metastases developed in 54.5 % of the patients (p = 0.0008). One- and five-year survival probabilities for all patients were 63.6 and 27.9 %. Five-year survival probability was 33 % for patients with SVC reconstruction and 25 % for patients with SVC replacement (p = 0.22). Five-year survival rates after pneumonectomy and lobectomy were 21.4 % and 37.5 %, respectively (p = 0.18).Radical resection involving the SVC in carefully selected patients with NSCLC results in excellent local tumor control. Due to the high rate of distant metastases, application of induction and adjuvant chemotherapy should be carefully assessed.

Status of the diagnostics development for the first operation phase of the stellarator Wendelstein 7-X.

An overview of the diagnostics which are essential for the first operational phase of Wendelstein 7-X and the set of diagnostics expected to be ready for operation at this time are presented. The ongoing investigations of how to cope with high levels of stray Electron Cyclotron Resonance Heating (ECRH) radiation in the ultraviolet (UV)/visible/infrared (IR) optical diagnostics are described.

Intramedullary gliofibroma: MR, ultrasound, and pathologic correlation.

We describe the clinical, MR, ultrasound, and pathologic findings of an intramedullary gliofibroma. This uncommon primitive tumor is thought to be of mixed glial and mesenchymal origin. Although the majority of tumors described to date have been histologically benign, clinical course has been quite variable. On MRI, the tumor we report was isointense to adjacent spinal cord on T1-weighted imaging and became hyperintense on proton and T2-weighted imaging. Enhancement with gadolinium diethylenetriamine pentaacetic acid was mild and slightly heterogeneous. Intraoperative ultrasound demonstrated widening of the lower thoracic cord. Echo pattern was generally similar to that of adjacent cord. The major differential diagnostic considerations include astrocytoma and ependymoma.

Feasibility of obtaining family consent for teaching cricothyrotomy on the newly dead in the emergency department.

STUDY OBJECTIVE: To determine whether family members of recently deceased emergency department patients would consent to the performance of a cricothyrotomy on the deceased for educational purposes. DESIGN: Prospective study. SETTING: Suburban tertiary care teaching hospital. PARTICIPANTS: Family members of 51 patients older than 18 years who were pronounced dead in the ED from atraumatic causes. INTERVENTIONS: Family members were approached by an attending physician for consent to perform a cricothyrotomy as a learning opportunity for physicians on their recently deceased family members. If consent was given, the procedure was performed by an emergency medicine resident physician under the attending physician's supervision. RESULTS: Of 51 deaths, 20 families (39%) consented to postmortem cricothyrotomy, 23 families (45%) refused consent, and 8 families (16%) were too distraught to be approached for consent. All 20 families that consented to the procedure were white, with little representation from other ethnic groups. CONCLUSION: Although there are difficulties in obtaining consent to perform invasive procedures on the recently deceased in the ED for educational purposes, our study demonstrates that many families will consent to such procedures if adequate information and explanation are provided. The results of this study may not be applicable to institutions serving patients with different cultural and ethnic backgrounds.