Development of a permanent magnet alternative for a solenoidal ion source

被引：7

作者：

Martens, J. ^{[1
]}

Fahy, A. ^{[1
]}

Barr, M. ^{[1
]}

Jardine, A. ^{[2
]}

Allison, W. ^{[2
]}

Dastoor, P. C. ^{[1
]}

机构：

[1] Univ Newcastle, Ctr Organ Elect, Callaghan, NSW 2308, Australia

[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2014年 / 340卷

关键词：

Electron impact ionizer; Permanent magnet; Neutral species detection; DESIGN;

D O I：

10.1016/j.nimb.2014.07.033

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The most sensitive desktop-sized ionizer utilising electron bombardment is currently the solenoidal ion source. We present an alternate design for such an ion source whereby the solenoidal windings of the electromagnet are replaced by a shaped cylindrical permanent magnet in order to reduce the complexity and running costs of the instrument. Through finite element modelling of the magnetic field in COMSOL and experimental measurements on a small-scale prototype magnet stack, we demonstrate the required shape of the permanent magnet in order to generate the needed field, and the necessity of soft iron collars to smooth fluctuations along the central axis. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：85 / 89

页数：5

共 11 条

[1]

Alderwick A., 2009, THESIS U CAMBRIDGE

[2] Simulation and analysis of solenoidal ion sources [J].

Alderwick, A. R. ;

Jardine, A. P. ;

Hedgeland, H. ;

MacLaren, D. A. ;

Allison, W. ;

Ellis, J. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2008, 79 (12)

[3]

Chisnall D., 2012, THESIS U CAMBRIDGE

[4] Design and performance of a highly efficient mass spectrometer for molecular beams [J].

DeKieviet, M ;

Dubbers, D ;

Klein, M ;

Pieles, U ;

Schmidt, C .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2000, 71 (05) :2015-2018

[5] The assessment of field ionization detectors for molecular beam use [J].

Doak, RB .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (29) :S2863-S2878

[6] Hexapole magnet system for thermal energy 3He atom manipulation [J].

Jardine, AP ;

Fouquet, P ;

Ellis, J ;

Allison, W .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2001, 72 (10) :3834-3841

[7] Model for calculating J(H) curves of Ni coated Nd-Fe-B magnets [J].

Katter, M. ;

Uestuener, K. ;

Blank, R. .

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL, 2006, 13 :87-91

[8] Imaging with neutral atoms - a new matter-wave microscope [J].

Koch, M. ;

Rehbein, S. ;

Schmahl, G. ;

Reisinger, T. ;

Bracco, G. ;

Ernst, W. E. ;

Holst, B. .

JOURNAL OF MICROSCOPY, 2008, 229 (01) :1-5

[9] Adjustable, short focal length permanent-magnet quadrupole based electron beam final focus system [J].

Lim, JK ;

Frigola, P ;

Travish, G ;

Rosenzweig, JB ;

Anderson, SG ;

Brown, WJ ;

Jacob, JS ;

Robbins, CL ;

Tremaine, AM .

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS, 2005, 8 (07) :1-17

[10] Focusing elements and design considerations for a scanning helium microscope (SHeM) [J].

Maclaren, DA ;

Holst, B ;

Riley, DJ ;

Allison, W .

SURFACE REVIEW AND LETTERS, 2003, 10 (2-3) :249-255

← 1 2 →