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

Angular-momentum-dominated electron ...

Sun, Yin-E.

Linked to FindBook

Google Book

Amazon

博客來

Angular-momentum-dominated electron beams and flat-beam generation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Angular-momentum-dominated electron beams and flat-beam generation./
Author:	Sun, Yin-E.
Description:	162 p.
Notes:	Adviser: Kwang-Je Kim.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Physics, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168400
ISBN:	9780542044816

Angular-momentum-dominated electron beams and flat-beam generation.
Sun, Yin-E.

Angular-momentum-dominated electron beams and flat-beam generation. - 162 p.

Adviser: Kwang-Je Kim.

Thesis (Ph.D.)--The University of Chicago, 2005.

Finally, factors that might spoil the smaller transverse emittance such as beamline misalignments and dispersions caused by magnetic elements are discussed. The limit of the emittance measurement system, such as camera resolution, is also studied.

ISBN: 9780542044816Subjects--Topical Terms:

1018488
Physics, General.

Angular-momentum-dominated electron beams and flat-beam generation.
LDR:03166nam 2200313 a 45 001 969781
005 20110920
008 110921s2005 eng d
020 $a 9780542044816
035 $a (UnM)AAI3168400
035 $a AAI3168400
040 $a UnM $c UnM
100 1 $a Sun, Yin-E. $3 1293839
245 1 0 $a Angular-momentum-dominated electron beams and flat-beam generation.
300 $a 162 p.
500 $a Adviser: Kwang-Je Kim.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1509.
502 $a Thesis (Ph.D.)--The University of Chicago, 2005.
520 $a Finally, factors that might spoil the smaller transverse emittance such as beamline misalignments and dispersions caused by magnetic elements are discussed. The limit of the emittance measurement system, such as camera resolution, is also studied.
520 $a In the absence of external forces, if the dynamics within an electron beam is dominated by its angular momentum rather than other effects such as random thermal motion or self Coulomb-repulsive force (i.e., space-charge force), the beam is said to be angular-momentum-dominated. Such a beam can be directly applied to the field of electron-cooling of heavy ions; or it can be manipulated into an electron beam with large transverse emittance ratio, i.e., a flat beam. A flat beam is of interest for high-energy electron-positron colliders or accelerator-based light sources.
520 $a An angular-momentum-dominated beam is generated at the Fermilab/NICADD photoinjector Laboratory (FNPL) and is accelerated to an energy of 16 MeV. The properties of such a beam is investigated systematically in experiment. The experimental results are in very good agreement with analytical expectations and simulation results. This lays a good foundation for the transformation of an angular-momentum-dominated beam into a flat beam.
520 $a The round-to-flat beam transformer is composed of three skew quadrupoles. Based on a good knowledge of the angular-momentum-dominated beam, the quadrupoles are set to the proper strengths in order to apply a total torque which removes the angular momentum, resulting in a flat beam. For bunch charge around 0.5 nC, an emittance ratio of 100 +/- 5 was measured, with the smaller normalized root-mean-square emittance around 0.4 mm-mrad.
520 $a Effects limiting the flat-beam emittance ratio are investigated, such as the chromatic effects in the round-to-flat beam transformer, asymmetry in the initial angular-momentum-dominated beam, and space-charge effects. The most important limiting factor turns out to be the uncorrelated emittance growth caused by space charge when the beam energy is low, for example, in the rf gun area. As a result of such emittance growth prior to the round-to-flat beam transformer, the emittance ratio achievable in simulation decreases from orders of thousands to hundreds.
590 $a School code: 0330.
650 4 $a Physics, General. $3 1018488
690 $a 0605
710 2 0 $a The University of Chicago. $3 1017389
773 0 $t Dissertation Abstracts International $g 66-03B.
790 $a 0330
790 1 0 $a Kim, Kwang-Je, $e advisor
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168400