skip to main content

Title: Suppression and control of leakage field in electromagnetic helical microwiggler

Shortening the period of electromagnetic wiggler introduces both the radical increase of the leakage field and the decrease of the field in the gap region. The leakage field is severer problem in planar electromagnetic wiggler than in helical wiggler. Hence, in order to develop a short period electromagnetic wiggler, we have adopted {open_quotes}three poles per period{close_quotes} type electromagnetic helical microwiggler. In this work, we inserted the permanent magnet (PM) blocks with specific magnetized directions in the space between magnetic poles, for suppressing the leakage field flowing out from a pole face to the neighboring pole face. These PM-blocks must have higher intrinsic coersive force than saturation field of pole material. The gap field due to each pole is adjustable by controlling the leakage fields, that is, controlling the position of each iron screw set in each retainer fixing the PM-blocks. At present time, a test wiggler with period 7.8mm, periodical number 10 and gap length 4.6mm has been manufactured. Because the ratio of PM-block aperture to gap length is important parameter to suppress the leakage field, the parameter has been surveyed experimentally for PM-blocks with several dimensions of aperture. The field strength of 3-5kG (K=0.2-0.4) would be expected in themore » wiggler.« less
Authors:
 [1] ;  [2] ;  [3]
  1. Kansai Univ., Osaka (Japan)
  2. Osaka Sangyo Univ. (Japan)
  3. Institute for Laser Technology, Osaka (Japan) [and others
Publication Date:
OSTI Identifier:
238650
Report Number(s):
BNL--61982-Absts.; CONF-9508156--Absts.
ON: DE96002729; TRN: 96:013139
Resource Type:
Conference
Resource Relation:
Conference: 17. international free electron laser conference, New York, NY (United States), 21-25 Aug 1995; Other Information: PBD: [1995]; Related Information: Is Part Of 17th international free electron laser conference and 2nd international FEL users` workshop. Program and abstracts; PB: 300 p.
Research Org:
Brookhaven National Lab., Upton, NY (United States)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; FREE ELECTRON LASERS; WIGGLER MAGNETS; ELECTROMAGNETIC FIELDS; PERMANENT MAGNETS; CONTROL