Keyword: coupling
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S10TS06 Modular Pulse Sequencing in a Tokamak System plasma, experiment, electron, timing 364
 
  • A.C. Chew, S. Lee, S.H. Saw
    Plasma Research Laboratory, University of Malaya, Kuala Lumpur, Malaysia
  
  Pulse tech­nique ap­plied in the tim­ing and se­quenc­ing of the var­i­ous part of the MUT toka­mak sys­tem are dis­cussed. The mod­u­lar ar­chi­tec­ture of the pulse gen­er­at­ing de­vice high­lights the ver­sa­tile ap­pli­ca­tion of the sim­ple phys­i­cal con­cepts in pre­cise and com­pli­cated re­search ex­per­i­ment. In ex­per­i­men­tal stud­ies of pulse plasma de­vices, tim­ing and se­quenc­ing of the var­i­ous events are an im­por­tant part of the ex­per­i­ment and re­quires care­ful con­sid­er­a­tions. This is achieved in the MUT (Uni­ver­sity of Malaya Toka­mak) toka­mak sys­tem by em­ploy­ing mod­u­lar ar­chi­tec­ture in­volv­ing var­i­ous mod­ules of pulse gen­er­at­ing de­vices.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S10TS06  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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S11LLC10 High Accuracy Measurement of Magnetic Field in Pulse Magnetic Elements operation, polarization, controls, power-supply 406
 
  • V. Kargaltsev, E.A. Kuper
    BINP SB RAS, Novosibirsk, Russia
  
  A CAMAC mod­ule in­tended for mea­sure­ments of in­stant mag­netic field using coil sen­sor is de­scribed. It is four chan­nel in­te­grat­ing ADC with cur­rent input in which sig­nal in­te­gra­tion time is con­trolled ex­ter­nally and may be op­ti­mized for a given sig­nal. Orig­i­nal tech­ni­cal so­lu­tion al­low­ing to elim­i­nate in­flu­ence of the in­te­gra­tor ca­pac­ity and switches in­sta­bil­ity on over­all ac­cu­racy is de­scribed. The large ac­cel­er­a­tor fa­cil­i­ties in­clude a great num­ber of mag­netic el­e­ments in­ter­act­ing with a beam for a short pe­riod rang­ing from 0.01 ms to 10 ms. For ex­am­ple, this class of el­e­ments in­cludes all the mag­netic com­po­nents of chan­nels for par­ti­cle trans­porta­tion. In ad­di­tion, most of these el­e­ments are op­er­at­ing rarely - once in 1 - 10000 s. For these el­e­ments the most op­ti­mal is the use of a pulse power sup­ply that re­duces the elec­tric power con­sump­tion and which is most im­por­tant, it solves the prob­lem of heat re­moval. Though, the pulse power sup­ply poses some prob­lems in pro­vid­ing the ac­cu­racy of mag­netic field and its mea­sure­ments.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC10  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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S18BPA01 Operational Decoupling in the SSC Collider lattice, betatron, quadrupole, collider 576
 
  • G. Bourianoff
    SSCL, Dallas, TX, USA
  
  This paper will sum­ma­rize a re­cent study of the ef­fects and cor­rec­tion of lin­ear cou­pling in the Su­per­con­duct­ing Super Col­lider (SSC) lat­tice. There are sev­eral as­pects of the SSC lat­tice that make di­rect ex­trap­o­la­tion of tech­niques used on ex­ist­ing ma­chines un­re­li­able. The most ob­vi­ous as­pect of the SSC which de­parts from pre­vi­ous ex­pe­ri­ence is the small dy­namic aper­ture which lies well within the beampipe. A sec­ond as­pect is the ex­is­tence of long arcs with low su­per­pe­ri­od­ic­ity which allow var­i­ous sources of skew quadru­pole to ac­cu­mu­late to large, and, per­haps, non­lin­ear val­ues. A third as­pect is the rel­a­tively large value of sys­tem­atic skew quadru­pole error in the main dipoles. This re­sults from asym­met­ric place­ment of the cold mass in the cryo­stat Cou­pling must be con­sid­ered harm­ful if it leads to ir­re­versible emit­tance blow-up, a de­crease in the dy­namic aper­ture, or in­op­er­abil­ity of the ma­chine. These neg­a­tive ef­fects are gen­er­ally re­lated to cou­pling terms that ac­cu­mu­late to large and, hence, non­lin­ear val­ues prior to cor­rec­tion. The harm­ful ef­fects can also be caused by the lin­early cou­pled or­bits in­ter­act­ing with high-or­der mul­ti­pole fields that exist in the other mag­nets. The er­rors that lead to lin­ear cou­pling are well known. They are sys­tem­atic and ran­dom skew quadru­pole error fields in the other mag­netic el­e­ments, an­gu­lar align­ment er­rors in the quadrupoles and feed­down from the sex­tu­pole fields as­so­ci­ated with chro­matic­ity cor­rec­tion, and per­sis­tent cur­rent fields in the dipoles. A study of the rel­a­tive im­por­tance of the var­i­ous cou­pling terms for a sim­pli­fied SSC lat­tice has been done by Richard Tal­man.
Operated by the Universities Research Association, Inc., for the U.S. Department of Energy under Contract No. DE-AC35-89ER40486. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S18BPA01  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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