Author: Dikshit, B.
Paper Title Page
MOPAB318 Beam Characterization of Five Electrode ECR Ion Source 980
 
  • H.M. Kewlani, S. Gharat, S. Krishnagopal, J.V. Mathew, S.V.L.S. Rao
    BARC, Mumbai, India
  • B. Dikshit, H.M. Kewlani, S. Krishnagopal
    Homi Bhbha National Institute (HBNI), DAE, Mumbai, India
  
  A five elec­trode ECR Ion Source (ECRIS) was de­vel­oped for the Low En­ergy High-In­ten­sity Pro­ton Ac­cel­er­a­tor (LEHIPA) at BARC. The ECRIS is op­er­ated at the en­ergy of 50 keV with a beam cur­rent of 20 mA. The ECRIS char­ac­ter­i­za­tion is done for the beam cur­rent, beam emit­tance, and pro­ton frac­tion in con­tin­u­ous and pulse beam op­er­a­tion. The pulsed beam op­er­a­tion of the ion source start­ing from 500 µs to 200 ms of pulse on time with a rep­e­ti­tion rate of 1 to 10 Hz. The trans­verse beam emit­tance mea­sure­ment is done by using an Al­li­son scan­ner. The beam emit­tance char­ac­ter­i­za­tion ex­per­i­ments are con­ducted by vary­ing ap­plied mi­crowave power to the plasma, op­er­at­ing gas pres­sure of plasma and puller volt­age. The mea­sured beam emit­tance is in the range of 0.3 pi.​mm. mrad to 0.4 pi.​mm. mrad for 50 keV beam. In this paper beam emit­tance ex­per­i­ment setup and re­sults are dis­cussed.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB318  
About • paper received ※ 19 May 2021       paper accepted ※ 10 June 2021       issue date ※ 16 August 2021  
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MOPAB321 Schlieren Imaging for Flow Visualisation of Gas Jet in Vacuum for Accelerator Applications 989
 
  • S. Rosily, B. Dikshit, S. Krishnagopal
    Homi Bhbha National Institute (HBNI), DAE, Mumbai, India
  • S. Krishnagopal, S. Rosily
    BARC, Mumbai, India
  
  Schlieren imag­ing was ex­plored for flow vi­su­al­is­ing of a gas jet in vac­uum for beam pro­file mon­i­tor ap­pli­ca­tion. In su­per­sonic gas jet based beam pro­file mon­i­tors, the high den­sity jet flows through var­i­ous dif­fer­en­tially pumped skim­mer stages be­fore being shaped into a sheet. Schlieren imag­ing is a well known tech­nique used in aero­dy­namic stud­ies to vi­su­alise gas flow. This tech­nique is ex­plained in the paper along with a gist of other flow vi­su­al­i­sa­tion tech­niques. An Z-type schlieren imag­ing setup used to view the high den­sity flow fea­tures of a pulsed su­per­sonic gas jet in­side vac­uum is de­scribed in de­tail. Flow around a Pitot probe in su­per­sonic flow was sim­u­lated and the re­sul­tant den­sity pro­file ob­tained was com­pared with the image ob­tained using schlieren imag­ing. The flow fea­tures in­clud­ing a de­tached shock around the tip of the probe was ob­serv­able at medium and high vac­uum after pro­cess­ing the image. Image pro­cess­ing al­go­rithms and tools use­ful for this ap­pli­ca­tion are also dis­cussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB321  
About • paper received ※ 20 May 2021       paper accepted ※ 26 May 2021       issue date ※ 29 August 2021  
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