東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Measurements of impurity concentrati...

Boyle, Dennis Patrick.

Linked to FindBook

Google Book

Amazon

博客來

Measurements of impurity concentrations and transport in the Lithium Tokamak Experiment.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Measurements of impurity concentrations and transport in the Lithium Tokamak Experiment./
Author:	Boyle, Dennis Patrick.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	142 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
Subject:	Plasma physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167489
ISBN:	9781369218381

Measurements of impurity concentrations and transport in the Lithium Tokamak Experiment.
Boyle, Dennis Patrick.

Measurements of impurity concentrations and transport in the Lithium Tokamak Experiment. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 142 p.

Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.

Thesis (Ph.D.)--Princeton University, 2016.

This thesis presents new measurements of core impurity concentrations and transport in plasmas with lithium coatings on all-metal plasma facing components (PFCs) in the Lithium Tokamak Experiment (LTX). LTX is a modest-sized spherical tokamak uniquely capable of operating with large area solid and/or liquid lithium coatings essentially surrounding the entire plasma (as opposed to just the divertor or limiter region in other devices).

ISBN: 9781369218381Subjects--Topical Terms:

3175417
Plasma physics.

Measurements of impurity concentrations and transport in the Lithium Tokamak Experiment.
LDR:03198nmm a2200313 4500 001 2122491
005 20170922124921.5
008 180830s2016 ||||||||||||||||| ||eng d
020 $a 9781369218381
035 $a (MiAaPQ)AAI10167489
035 $a AAI10167489
040 $a MiAaPQ $c MiAaPQ
100 1 $a Boyle, Dennis Patrick. $3 3284461
245 1 0 $a Measurements of impurity concentrations and transport in the Lithium Tokamak Experiment.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 142 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
500 $a Advisers: Robert Kaita; Richard Majeski.
502 $a Thesis (Ph.D.)--Princeton University, 2016.
520 $a This thesis presents new measurements of core impurity concentrations and transport in plasmas with lithium coatings on all-metal plasma facing components (PFCs) in the Lithium Tokamak Experiment (LTX). LTX is a modest-sized spherical tokamak uniquely capable of operating with large area solid and/or liquid lithium coatings essentially surrounding the entire plasma (as opposed to just the divertor or limiter region in other devices).
520 $a Lithium (Li) wall-coatings have improved plasma performance and confinement in several tokamaks with carbon (C) PFCs, including the National Spherical Torus Experiment (NSTX). In NSTX, contamination of the core plasma with Li impurities was very low (<0.1%) despite extensive divertor coatings. Low Li levels in NSTX were found to be largely due to neoclassical forces from the high level of C impurities. Studying impurity levels and transport with Li coatings on stainless steel surfaces in LTX is relevant to future devices (including future enhancements to NSTX-Upgrade) with all-metal PFCs.
520 $a The new measurements in this thesis were enabled by a refurbished Thomson scattering system and improved impurity spectroscopy, primarily using a novel visible spectrometer monitoring several Li, C, and oxygen (O) emission lines. A simple model was used to account for impurities in unmeasured charge states, assuming constant density in the plasma core and constant concentration in the edge. In discharges with solid Li coatings, volume averaged impurity concentrations were low but non-negligible, with~2-4% Li, ~0.6-2% C, ~0.4-0.7% O, and Z eff<1.2.
520 $a Transport was assessed using the TRANSP, NCLASS, and MIST codes. Collisions with the main H ions dominated the neoclassical impurity transport, unlike in NSTX, where collisions with C dominated. Furthermore, neoclassical transport coefficients calculated with NCLASS were similar across all impurity species and differed no more than a factor of two, in contrast to NSTX where they differed by an order of magnitude. However, time-independent simulations with MIST indicated that unlike NSTX, neoclassical theory did not fully capture the impurity transport and anomalous transport likely played a significant role in determining impurity profiles.
590 $a School code: 0181.
650 4 $a Plasma physics. $3 3175417
690 $a 0759
710 2 $a Princeton University. $b Plasma Physics. $3 2097745
773 0 $t Dissertation Abstracts International $g 78-04B(E).
790 $a 0181
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167489