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What’s the most difficult question you’ve been asked as a maintenance instructor?
Blye Widmar
"Where are the prints?!"
This was the final question in an onslaught of verbal feedback, comments, and critiques I received from my students back in 2019. I had two years of instructor experience and was teaching a class that had been meticulously rehearsed in preparation for an accreditation visit. I knew the training material well and transferred that knowledge effectively enough for all the students to pass the class. As we wrapped up, I asked the students how they felt about my first big system-level class, and they did not hold back.
“Why was the exam from memory when we don’t work from memory in the plant?” “Why didn’t we refer to the vendor documents?” “Why didn’t we practice more on the mock-up?” And so on.
T. Watanabe, S. Masuzaki, Y. Nakamura, LHD Experimental Group, H. Hojo (20R02)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 147-149
Technical Paper | Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST07-A1336
Articles are hosted by Taylor and Francis Online.
Open field line region plays the key role for steady state operation of the Large Helical Device (LHD) and greatly contributes to the high-performance plasma confinement in the LHD. Chaotic field line region, produced by high magnetic shear and nonaxisymmetry of the magnetic field, is present in open field line re gion outside the last closed flux surface (LCFS) of the LHD. The chaotic field line layer can sustain ambient plasma due to the long connection length of lines of force, presence of the embedded magnetic islands and mirror confinement effect of helical ripple nature of the magnetic field. This ambient plasma plays a role of an impregnable barrier for the core plasma, which suppresses both the MHD instabilities and the cooling of the core plasma due to charge exchange processes. Slow and small periodic sweeping of magnetic axis po sition can control the deconcentration of divertor heat flux in the LHD.
