Author: Tympel, V.
Paper Title Page
TUP034 Axial Cryogenic Current Comparator (CCC) for FAIR 259
 
  • L. Crescimbeni, D.M. Haider, A. Reiter, M. Schwickert, T. Sieber, T. Stöhlker
    GSI, Darmstadt, Germany
  • D.M. Haider
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Schmelz, R. Stolz, V. Zakosarenko
    IPHT, Jena, Germany
  • F. Schmid, V. Tympel
    FSU Jena, Jena, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • T. Stöhlker, V. Tympel
    HIJ, Jena, Germany
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  
  Funding: Work supported by the BMBF under contract No. 05P21SJRB1.
The Cryo­genic Cur­rent Com­para­tor (CCC) is a su­per­con­duct­ing de­vice based on an ul­tra­sen­si­tive SQUID (fT range). Mea­sur­ing the beam¿s az­imuthal mag­netic field, it pro­vides a cal­i­brated non-de­struc­tive mea­sure­ment of beam cur­rent with a res­o­lu­tion of 10 nA or bet­ter, in­de­pen­dent from ion species and with­out te­dious cal­i­bra­tions pro­ce­dure. The non-in­ter­cep­tive ab­solute in­ten­sity mea­sure­ment of weak ion beams (< 1 µA) is es­sen­tial in heavy ion stor­age rings and in trans­fer lines at FAIR. With stan­dard di­ag­nos­tics, this mea­sure­ment is chal­leng­ing for bunched beams and vir­tu­ally im­pos­si­ble for coast­ing beams. To im­prove the per­for­mance of the de­tec­tor sev­eral up­grades are under study and de­vel­op­ment: One is the in­ves­ti­ga­tion of a new type of CCC using an al­ter­na­tive mag­netic shield geom­e­try. The so-called ‘axial¿ geom­e­try will allow for much higher mag­netic shield­ing fac­tor, an in­creased pick-up area, and a lower low fre­quen­cies noise com­po­nent. Fur­ther im­prove­ments and op­ti­miza­tions of the de­tec­tor will be pre­sented. The CCC will be tested on the beam­line at the end of 2023 al­low­ing to de­fine the best pos­si­ble ver­sion for FAIR. 		 
poster icon Poster TUP034 [3.877 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP034  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP036 Cryogenic Current Comparators as Low Intensity Diagnostics for Ion Beams 268
 
  • T. Sieber, L. Crescimbeni, D.M. Haider, M. Schwickert, T. Stöhlker
    GSI, Darmstadt, Germany
  • D.M. Haider, N. Marsic
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Schmelz, R. Stolz, V. Zakosarenko
    IPHT, Jena, Germany
  • F. Schmid
    FSU Jena, Jena, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • T. Stöhlker, V. Tympel
    HIJ, Jena, Germany
  • J. Tan
    CERN, Meyrin, Switzerland
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  
  The Cryo­genic Cur­rent Com­para­tor (CCC) is a SQUID based su­per­con­duct­ing de­vice for in­ten­sity mea­sure­ment, firstly pro­posed as a beam di­ag­nos­tics in­stru­ment in the 90s at GSI. After prove of prin­ci­ple the CCC was in­tro­duced into other fa­cil­i­ties, at­test­ing great po­ten­tial for high res­o­lu­tion mea­sure­ments but at the same time con­sid­er­able me­chan­i­cal and cryo­gen­ics chal­lenges and costs. In the course of plan­nings for FAIR the CCC has been re­vi­tal­ized. Sys­tem­atic in­ves­ti­ga­tions started, in­volv­ing com­mer­cially avail­able SQUID sys­tems, which led to im­prove­ments of de­tec­tor and cryo­stat. The de­vel­op­ments re­sulted in nA spill mea­sure­ments at GSI (2014) fol­lowed by the in­stal­la­tion of a CCC in CERN An­tipro­ton De­cel­er­a­tor (AD), which has in the mean­time be­come a key in­stru­ment. Since then op­ti­miza­tion of the de­vice is on­go­ing, with re­spect to var­i­ous op­er­at­ing con­di­tions, sys­tem ro­bust­ness, cur­rent res­o­lu­tion and last but not least sys­tem costs. Al­ter­na­tive CCC ver­sions with im­proved mag­netic shield­ing have been de­vel­oped as well as ¿Dual Core‘ ver­sions for back­ground noise re­duc­tion. We give an overview of CCC op­ti­miza­tion and de­vel­op­ment steps, with focus on ap­pli­ca­tions at GSI and FAIR.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP036  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 21 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)