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Title: Beam Extraction from Laser Driven Multi-Charged Ion Source

Abstract

A newly proposed type of multicharged ion source offers the possibility of an economically advantageous high-charge-state fusion driver. Multiphoton absorption in an intense uniform laser focus can give multiple charge states of high purity, simplifying or eliminating the need for charge-state separation downstream. Very large currents (hundreds of amperes) can be extracted from this type of source. Several arrangements are possible. For example, the laser plasma could be tailored for storage in a magnetic bucket, with beam extracted from the bucket. A different approach, described in this report, is direct beam extraction from the expanding laser plasma. They discuss extraction and focusing for the particular case of a 4.1-MV beam of Xe{sup 16+} ions. The maximum duration of the beam pulse is limited by the total charge in the plasma, while the practical pulse length is determined by the range of plasma radii over which good beam optics can be achieved. The extraction electrode contains a solenoid for beam focusing. The design studies were carried out first with an envelope code and then with a self-consistent particle code. Results from the initial model showed that hundreds of amperes could be extracted, but that most of this current missed the solenoidmore » entrance or was intercepted by the wall and that only a few amperes were able to pass through. They conclude with an improved design which increases the surviving beam to more than 70 amperes.« less

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15007298
Report Number(s):
UCRL-JC-143538
TRN: US200415%%78
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 7th International Conference on Ion Sources, Taormina (IT), 09/07/1997--09/13/1997; Other Information: PBD: 19 Mar 2001
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; BATTERY CHARGE STATE; BEAM EXTRACTION; BEAM OPTICS; CHARGE STATES; DESIGN; ELECTRODES; FOCUSING; ION SOURCES; LASERS; MULTICHARGED IONS; PLASMA; SOLENOIDS; STORAGE

Citation Formats

Anderson, O A, and Logan, B G. Beam Extraction from Laser Driven Multi-Charged Ion Source. United States: N. p., 2001. Web.
Anderson, O A, & Logan, B G. Beam Extraction from Laser Driven Multi-Charged Ion Source. United States.
Anderson, O A, and Logan, B G. Mon . "Beam Extraction from Laser Driven Multi-Charged Ion Source". United States. https://www.osti.gov/servlets/purl/15007298.
@article{osti_15007298,
title = {Beam Extraction from Laser Driven Multi-Charged Ion Source},
author = {Anderson, O A and Logan, B G},
abstractNote = {A newly proposed type of multicharged ion source offers the possibility of an economically advantageous high-charge-state fusion driver. Multiphoton absorption in an intense uniform laser focus can give multiple charge states of high purity, simplifying or eliminating the need for charge-state separation downstream. Very large currents (hundreds of amperes) can be extracted from this type of source. Several arrangements are possible. For example, the laser plasma could be tailored for storage in a magnetic bucket, with beam extracted from the bucket. A different approach, described in this report, is direct beam extraction from the expanding laser plasma. They discuss extraction and focusing for the particular case of a 4.1-MV beam of Xe{sup 16+} ions. The maximum duration of the beam pulse is limited by the total charge in the plasma, while the practical pulse length is determined by the range of plasma radii over which good beam optics can be achieved. The extraction electrode contains a solenoid for beam focusing. The design studies were carried out first with an envelope code and then with a self-consistent particle code. Results from the initial model showed that hundreds of amperes could be extracted, but that most of this current missed the solenoid entrance or was intercepted by the wall and that only a few amperes were able to pass through. They conclude with an improved design which increases the surviving beam to more than 70 amperes.},
doi = {},
url = {https://www.osti.gov/biblio/15007298}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {3}
}

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