Critical Current Measurements of the Main LHC Superconducting Cables

Verweij, Arjan; Ghosh, A.

doi:10.1109/tasc.2007.898000

“…At the Facility for the Research on Superconducting Cables (FReSCa) of CERN, 36 the cable test station has been upgraded by introducing a cryo-transformer developed a few years ago and newly equipped with a fully digital control system, based on the fast digital integrator, and relying on its high resolution and stability. The current circulating in the secondary of the transformer and in the sample is measured by means of two toroidal Rogowski coils (Table V).…”

Section: Current Measurements At Cryogenic Temperaturementioning

confidence: 99%

Performance of a fast digital integrator in on-field magnetic measurements for particle accelerators

Arpaïa

¹

,

Bottura

²

,

Fiscarelli

³

et al. 2012

Review of Scientific Instruments

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The fast digital integrator has been conceived to face most demanding magnet test requirements with a resolution of 10 ppm, a signal-to-noise ratio of 105 dB at 20 kHz, a time resolution of 50 ns, an offset of 10 ppm, and on-line processing. In this paper, the on-field achievements of the fast digital integrator are assessed by a specific measurement campaign at the European Organization for Nuclear Research (CERN). At first, the architecture and the metrological specifications of the instrument are reported. Then, the recent on-field achievements of (i) ±10 ppm of uncertainty in the measurement of the main field for superconducting magnets characterization, (ii) ±0.02% of field uncertainty in quality assessment of small-aperture permanent magnets, and (iii) ±0.15% of drift, in an excitation current measurement of 600 s under cryogenic conditions, are presented and discussed.Published in Review of Scientific Instruments (2012) Geneva, Switzerland CERN-ATS-2012-019February 2012 Abstract REVIEW OF SCIENTIFIC INSTRUMENTS 83, 024702 (2012) Performance of a fast digital integrator in on-field magnetic measurements for particle accelerators The fast digital integrator has been conceived to face most demanding magnet test requirements with a resolution of 10 ppm, a signal-to-noise ratio of 105 dB at 20 kHz, a time resolution of 50 ns, an offset of 10 ppm, and on-line processing. In this paper, the on-field achievements of the fast digital integrator are assessed by a specific measurement campaign at the European Organization for Nuclear Research (CERN). At first, the architecture and the metrological specifications of the instrument are reported. Then, the recent on-field achievements of (i) ±10 ppm of uncertainty in the measurement of the main field for superconducting magnets characterization, (ii) ±0.02 % of field uncertainty in quality assessment of small-aperture permanent magnets, and (iii) ±0.15 % of drift, in an excitation current measurement of 600 s under cryogenic conditions, are presented and discussed.

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“…17). The specifications on critical current have been met, and average values ∼10% larger than specification have been obtained [45].…”

Section: Production and Quality Control On Components And Assemblymentioning

confidence: 99%

The Development of Superconducting Magnets for Use in Particle Accelerators: From the Tevatron to the LHC

Tollestrup

¹

,

Todesco

²

2008

Rev. Accl. Sci. Tech.

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Superconducting magnets have played a key role in advancing the energy reach of proton synchrotrons and enabling them to play a major role in defining the Standard Model. The problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of this technology. The LHC is being prepared to answer the many questions beyond the Standard Model and in itself is at the cutting edge of technology. A description of its magnets and their properties is given to illustrate the advances that have been made in the use of superconducting magnets over the past 30 years. EZIO TODESCO CERN, Accelerator Technology Department Geneva, 1211 SwitzerlandSuperconducting magnets have played a key role in advancing the energy reach of proton synchrotrons and enabling them to play a major role in defining the Standard Model. The problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of this technology. The LHC is being prepared to answer the many questions beyond the Standard Model and in itself is at the cutting edge of technology. A description of its magnets and their properties is given to illustrate the advances that have been made in the use of superconducting magnets over the past 30 years.

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“…Using this cable, the fields reachable in a cosθ dipole are shown in Fig. 36: a coil width of [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] mm can provide short sample fields in the range of 14-16 T.…”

Section: Outlook On Future Accelerator Magnetsmentioning

confidence: 99%

The Development of Superconducting Magnets for Use in Particle Accelerators: From the Tevatron to the LHC

Tollestrup¹,

Todesco²

2008

Reviews of Accelerator Science and Technology

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Superconducting magnets have played a key role in advancing the energy reach of proton synchrotrons and enabling them to play a major role in defining the Standard Model. The problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of this technology. The LHC is being prepared to answer the many questions beyond the Standard Model and in itself is at the cutting edge of technology. A description of its magnets and their properties is given to illustrate the advances that have been made in the use of superconducting magnets over the past 30 years. EZIO TODESCO CERN, Accelerator Technology Department Geneva, 1211 SwitzerlandSuperconducting magnets have played a key role in advancing the energy reach of proton synchrotrons and enabling them to play a major role in defining the Standard Model. The problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of this technology. The LHC is being prepared to answer the many questions beyond the Standard Model and in itself is at the cutting edge of technology. A description of its magnets and their properties is given to illustrate the advances that have been made in the use of superconducting magnets over the past 30 years.

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Critical Current Measurements of the Main LHC Superconducting Cables

Cited by 12 publications

References 8 publications

Performance of a fast digital integrator in on-field magnetic measurements for particle accelerators

Performance of a fast digital integrator in on-field magnetic measurements for particle accelerators

The Development of Superconducting Magnets for Use in Particle Accelerators: From the Tevatron to the LHC

The Development of Superconducting Magnets for Use in Particle Accelerators: From the Tevatron to the LHC

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