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T Munsat

Publications and source records attributed to T Munsat.

14 recordsLinked to original sources
PubMed2006

Observation of high-field-side crash and heat transfer during sawtooth oscillation in magnetically confined plasmas.

High resolution (temporal and spatial), two-dimensional images of electron temperature fluctuations during sawtooth oscillations were employed to study the crash process and heat transfer in magnetically confined toroidal plasmas. The combination of kink and local pressure driven instabilities leads to a small poloidally localized puncture in the magnetic surface at both the low and the high field sides of the poloidal plane. This observation closely resembles the "fingering event" of the ballooning mode model with the high- mode only predicted at the low field side.

Journal Article↗
PubMed2006

Comparison study of 2D images of temperature fluctuations during sawtooth oscillation with theoretical models.

High temporal and spatial resolution two-dimensional (2D) images of electron temperature fluctuations were employed to study the sawtooth oscillation in the Toroidal Experiment for Technically Oriented Research tokamak plasmas. The 2D images are directly compared with the expected 2D patterns of the plasma pressure (or electron temperature) from various theoretical models. The observed experimental 2D images are only partially in agreement with the expected patterns from each model: The image of the initial reconnection process is similar to that of the ballooning mode model. The intermediate and final stages of the reconnection process resemble those of the full reconnection model. The time evolution of the images of the hot spot or island is partially consistent to those from the full reconnection model but is not consistent with those from the quasi-interchange model.

Journal Article↗
PubMed2003

Controlled optimization of mode conversion from electron Bernstein waves to extraordinary mode in magnetized plasma.

In the CDX-U spherical torus, agreement between radiation temperature and Thomson scattering electron temperature profiles indicates approximately 100% conversion of thermally emitted electron Bernstein waves to the X mode. This has been achieved by controlling the electron density scale length (L(n)) in the conversion region with a local limiter outside the last closed flux surface, shortening L(n) to the theoretically required value for optimal conversion. From symmetry of the conversion process, prospects for efficient coupling in heating and current drive scenarios are strongly supported.

Journal Article↗
PubMed1998

An analysis of extended survival in patients with amyotrophic lateral sclerosis treated with riluzole.

BACKGROUND: In an attempt to better understand and define the progression of amyotrophic lateral sclerosis (ALS), we developed a classification of 5 discrete health states that reflect patients' activities of daily living. These health states were used to determine whether patients with ALS who are treated with riluzole differed from those treated with placebo. SETTING: Clinics for patients with ALS. DESIGN: Placebo-controlled trial of riluzole treatment in 959 patients with ALS. INTERVENTIONS: Treatment with riluzole or placebo. MAIN DEPENDENT MEASURES: A Cox model was used to assess whether, from the initial randomization to the end of an 18-month follow-up, there was a difference in the times of transition into subsequent health states between patients treated with riluzole and those treated with placebo. RESULTS: Our analysis showed a significant difference in the time to transit between the riluzole and the placebo groups in less severely affected cases, ie, state 2 and state A (the milder states) of ALS. CONCLUSION: Patients receiving riluzole remained in the milder health states longer (P<.05).

Amyotrophic Lateral Sclerosis↗
PubMedDate not supplied

Inflammatory myopathy in oculopharyngeal dystrophy.

A 75-year-old French-Canadian woman with familial oculopharyngeal dystrophy demonstrated histopathologic alterations similar to those of idiopathic polymyositis. A second biopsy obtained 15 months later was more consistent with previously reported cases. It is suggested that certain patients with oculopharyngeal dystrophy may pass through an initial phase of secondary muscle inflammation similar to that seen in some other heritable myopathies.

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