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Experiments and simulations of a lar...

Hidaka, Yoshiteru.

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Experiments and simulations of a large area ECR source as an electric propulsion neutralizer.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Experiments and simulations of a large area ECR source as an electric propulsion neutralizer./
Author:	Hidaka, Yoshiteru.
Description:	219 p.
Notes:	Advisers: Ronald M. Gilgenbach; Yue Ying Lau.
Contained By:	Dissertation Abstracts International67-02B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3208466
ISBN:	9780542569128

Experiments and simulations of a large area ECR source as an electric propulsion neutralizer.
Hidaka, Yoshiteru.

Experiments and simulations of a large area ECR source as an electric propulsion neutralizer. - 219 p.

Advisers: Ronald M. Gilgenbach; Yue Ying Lau.

Thesis (Ph.D.)--University of Michigan, 2006.

The windowed electron cyclotron resonance (ECR) source, invented by Getty, was modified into a windowless ECR source to investigate the potential use of this device as an electron source for the neutralizer of an ion thruster system. This plasma source utilizes linear arrays of permanent magnets placed at the end of a large S-band microwave horn. These magnets are held inside a grill with alternating rows of open spaces and aluminum cross bars. The metal bars are cross-polarized so that microwave radiation transmits through the grill with low reflection.

ISBN: 9780542569128Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Experiments and simulations of a large area ECR source as an electric propulsion neutralizer.
LDR:03528nam 2200361 a 45 001 973906
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008 110928s2006 eng d
020 $a 9780542569128
035 $a (UMI)AAI3208466
035 $a AAI3208466
040 $a UMI $c UMI
100 1 $a Hidaka, Yoshiteru. $3 1297850
245 1 0 $a Experiments and simulations of a large area ECR source as an electric propulsion neutralizer.
300 $a 219 p.
500 $a Advisers: Ronald M. Gilgenbach; Yue Ying Lau.
500 $a Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 1129.
502 $a Thesis (Ph.D.)--University of Michigan, 2006.
520 $a The windowed electron cyclotron resonance (ECR) source, invented by Getty, was modified into a windowless ECR source to investigate the potential use of this device as an electron source for the neutralizer of an ion thruster system. This plasma source utilizes linear arrays of permanent magnets placed at the end of a large S-band microwave horn. These magnets are held inside a grill with alternating rows of open spaces and aluminum cross bars. The metal bars are cross-polarized so that microwave radiation transmits through the grill with low reflection.
520 $a The peak electron density and electron temperature measured 1 cm from the grill surface were 5 x 1010 cm-3 and 10 eV, respectively, for 200 W input microwave power and 1 mTorr argon gas pressure. At the axial distance of 25 cm from the grill surface, these values were 1 x 1010 cm-3 and 4 eV, respectively.
520 $a The extracted electron current with pulsed bias increased with collector areas and with input microwave powers, as expected, though the increase was not linear. Unexpectedly, however, the current increased as the distance of the collector from the resonance zone was increased.
520 $a With microwave circuit optimization, the pulsed electron current achieved 0.77 A with a 30-V bias voltage applied to a graphite collector (7.3 cm x 10.7 cm, located 28.3 cm from the grill surface), 200 W input microwave power, and 1 mTorr argon gas pressure. For DC extraction with the same settings, an electron current of 0.51 A was extracted.
520 $a The 2D simulations using the MAGIC computer code demonstrated electrons gain energy only near the ECR zone (875 gauss contour). The effectiveness of the steel pole pieces designed for the windowless Getty source was also confirmed. The curvature in either electric or magnetic field profile was verified as a necessary condition for ECR to take place. Electron trajectory plots using the TriComp computer code showed electron trapping by the magnetic mirrors.
520 $a Both experiments and simulations indicated that electron cross-field diffusion near the grill surface was weak due to the strong magnetic field. However, the experiments suggested that the diffusion far from the grill is significant due to the weak magnetic field there, where more electron current can be extracted. Hence, a large portion of electrons in regions far from the grill might be supplied by electrons streaming along the edge field lines, instead of electrons diffusing across the center field lines.
590 $a School code: 0127.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Engineering, Nuclear. $3 1043651
690 $a 0538
690 $a 0544
690 $a 0552
710 2 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 67-02B.
790 $a 0127
790 1 0 $a Gilgenbach, Ronald M., $e advisor
790 1 0 $a Lau, Yue Ying, $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3208466