Keyword: polarization
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TUOPMA04 Apple II Insertion Devices Made at MAXIV undulator, MMI, alignment, operation 6
 
  • A. Thiel, M. Ebbeni, H. Tarawneh
    MAX IV Laboratory, Lund University, Lund, Sweden
  
  At pre­sent five Apple II in­ser­tion de­vices were made and in­stalled at MAX IV, three of them in the 1.5GeV-ring, and two in the 3GeV-ring. The as­sem­bly of the last one of a total num­ber of six Apple II un­du­la­tors made at MAX IV is cur­rently going on. The un­du­la­tors have pe­riod lengths of 48mm (two de­vices), 53mm, 58mm, 84mm and 95.2mm. The op­er­a­tional gap range of the 3GeV de­vices is be­tween 11mm and 150mm, the range of the 1.5GeV de­vices is 14mm to 150mm. Struc­tural analy­sis was ap­plied to as­sure a min­i­mum de­flec­tion of the main frame and the mag­net array gird­ers. The main frame is made of nodu­lar cast iron, while the gird­ers are made of alu­minium alloy. In order to op­ti­mize the mag­netic tun­ing the po­si­tion of the mag­net keep­ers can be ad­justed by wedges. The un­du­la­tors were fidu­cial­ized be­fore the in­stal­la­tion in the ring tun­nel and were aligned in the straight sec­tion using their mag­netic cen­tre as ref­er­ence. All MAX IV made un­du­la­tors have three feet with ver­ti­cal ad­just­ment and sep­a­rate hor­i­zon­tal ad­justers. This paper de­scribes the de­sign, as­sem­bly, shim­ming and in­stal­la­tion of the MAX IV Apple II de­vices in more de­tail.  
slides icon Slides TUOPMA04 [12.328 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUOPMA04  
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TUPH42 A Novel Attempt to Develop a Linear Polarization Adjustable Undulator Based on Magnetic Force Compensation Technology undulator, radiation, FEL, SRF 140
 
  • W. Zhang, Y. Zhu
    SINAP, Shanghai, People's Republic of China
  
  A lin­ear po­lar­iza­tion ad­justable un­du­la­tor is pro­posed in this paper. This un­du­la­tor can reach 1.5T mag­netic peak field with a pe­riod length 68mm and mag­net length 4m. By adding two re­pul­sive mag­net ar­rays be­side cen­ter array the mag­netic force be­tween gird­ers can be re­duced from 70kN to near zero. Such an ap­proach can re­sult in a sig­nif­i­cant re­duc­tion of the un­du­la­tor vol­ume, sim­pli­fi­ca­tion of the strong back de­sign and fab­ri­ca­tion. By means of ro­tat­ing through the cen­ter of un­du­la­tor we can achieve mag­netic field from ver­ti­cal ori­en­ta­tion to hor­i­zon­tal ori­en­ta­tion. The lin­ear po­lar­iza­tion of ra­di­a­tion can be ad­justed be­tween zero and 90 de­gree  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH42  
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THPH05 An Improved Polarisation Analyser for the I16 Beamline at Diamond detector, vacuum, scattering, factory 346
 
  • M.H. Burt, S.P. Collins, S. Green, I. Horswell, J. Li, G. Nisbet, R. Pocock, J. Spiers, K.G. Wilkinson
    DLS, Oxfordshire, United Kingdom
  
  The pro­ject to up­grade the I16 po­lar­i­sa­tion analyser was nec­es­sary to in­crease its func­tion­al­ity and to in­tro­duce a more ro­bust con­struc­tion. The re­quire­ment that the analyser was to be mounted on a dif­frac­tome­ter meant the con­struc­tion needed to be as light­weight and as com­pact as pos­si­ble. This pro­vided op­por­tu­ni­ties to ex­plore new col­lab­o­ra­tive ways of work­ing with both in-house and ex­ter­nal sup­pli­ers. The paper de­scribes the ap­proach taken to de­velop light­weight alu­minium vac­uum cham­bers work­ing with a com­pany spe­cial­is­ing in ad­di­tive layer man­u­fac­tur­ing. In ad­di­tion, the de­sign of light­weight and com­pact slit as­sem­blies are de­tailed; these were de­vel­oped in col­lab­o­ra­tion with a sup­plier of dri­ven lin­ear stages. A novel re­quire­ment for the analyser is to have a de­tec­tor mounted on a ro­ta­tion axis in vac­uum. The re­sults of work­ing with the in-house de­tec­tor group to de­velop a de­sign to with all the nec­es­sary ther­mal and elec­tri­cal con­nec­tions are de­scribed. The paper also de­scribes fur­ther use of ad­di­tive layer man­u­fac­tur­ing to pro­duce pro­to­types that al­lows the de­sign of a cable man­age­ment sys­tem to be op­ti­mised where pre­vi­ously using 3d CAD mod­els had proved un­sat­is­fac­tory.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH05  
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