Performance of HQ02, an Optimized Version of the 120 mm &lt;formula formulatype="inline"&gt;&lt;tex Notation="TeX"&gt; $\hbox{Nb}_{3}\hbox{Sn}$&lt;/tex&gt;&lt;/formula&gt; LARP Quadrupole

Chlachidze, G.; Ambrosio, G.; Anerella, M.; Borgnolutti, F.; Bossert, R.; Caspi, S.; Cheng, D.; Dietderich, D.R.; Félice, H.; Ferracin, P.; Ghosh, A.; Godeke, A.; Hafalia, A.R.; Marchevsky, M.; Orris, D.; Roy, P.K.; Sabbi, G.; Salmi, Tiina; Schmalzle, J.; Sylvester, C.; Tartaglia, M.; Tompkins, J.; Wanderer, P.; Wang, X. R.; Zlobin, A.V.

doi:10.1109/tasc.2013.2285885

Cited by 20 publications

(5 citation statements)

References 11 publications

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“…When the AE experiments were conducted, the magnet had already undergone training up to short sample limit at 4.2 K [18], and was further trained at 1.9 K (test HQ02b) [19]. A clear AE precursor to quenching was observed in every current ramp.…”

Section: 1training and Ae In The Hq02b Quadrupolementioning

confidence: 99%

Acoustic emission during quench training of superconducting accelerator magnets

et al. 2015

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Section: 1training and Ae In The Hq02b Quadrupolementioning

confidence: 99%

Acoustic emission during quench training of superconducting accelerator magnets

et al. 2015

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“…Fig. 2 shows the current I 1 measured during such tests, compared to discharges obtained by triggering conventional quench heaters attached to the outer layer of the coil (OL QH) [8] or both to its inner and outer layers (IL+OL QH). One can conclude that this 0.8 m long magnet can be discharged significantly faster by CLIQ.…”

Section: B Comparison To Conventional Quench Heatersmentioning

confidence: 99%

Protecting a Full-Scale <inline-formula> <tex-math notation="TeX">$\hbox{Nb}_{3}\hbox{Sn}$</tex-math></inline-formula> Magnet With CLIQ, the New Coupling-Loss-Induced Quench System

Ravaioli

Bajas

Datskov

et al. 2015

IEEE Trans. Appl. Supercond.

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A new protection system for superconducting magnets called coupling-loss induced quench system (CLIQ) has been recently developed at CERN. Recent tests on Nb-Ti coils have shown that CLIQ is a valid, efficient, and promising method for the protection of high-magnetic-field superconducting magnets. However, the protection of new-generation Nb 3 Sn accelerator magnets is even more challenging due to the much higher stored energy per unit volume and to the significantly larger enthalpy needed to initiate and propagate a normal zone in such coils. Now, the CLIQ system is tested for the first time on a Nb 3 Sn magnet in the CERN magnet test facility in order to investigate its performance in practice, thereby validating the method for this type of superconducting magnets as well. Furthermore, we successfully reproduced the electrothermal transients during a CLIQ discharge. Finally, the implementation of various CLIQ-based protection schemes for the full-scale Nb 3 Sn quadrupole magnet for the LHC high luminosity upgrade is discussed. The impact of key system parameters on CLIQ performance and the advantages and drawbacks of using multiple CLIQ units on a single magnet are discussed.

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“…Typical values recently measured on the Nb 3 Sn model magnets for the High Luminosity LHC [78] are in the range 10 to 30 ms at 80% of the short-sample current for the 12 T quadrupole magnet [79] and 11 T dipole [80,81], in good agreement with simulation predictions [71,72]. However, the quench-heater delay refers to the very start of the induced normal zone, whereas the time margin refers to the transfer to the normal state of the entire winding pack, and the difference between these two values is significant.…”

Section: Quench Heatersmentioning

confidence: 99%

“…One 28.2 mF, 500 V CLIQ unit is connected to the midpoint of a 120 mm aperture Nb 3 Sn quadrupole model magnet developed by the US LARP collaboration for the high luminosity LHC [79,[90][91][92][93][94]. At t=0 the magnet is at the nominal current of I 0 =14.6 kA.…”

Section: Electrical Circuitmentioning

confidence: 99%

“…However, the value Similar tests are performed at different initial currents ranging from 3 to 14.6 kA, triggering CLIQ at t=0 and the energy extraction system at t=3 ms. The magnet currents measured are shown in figure 5.8, and compared to discharges obtained by triggering conventional quench heaters attached to the outer layer of the coil (OL QH) [79], or both to its inner and outer layers (IL+OL QH). One can conclude that this 0.8 m long magnet can be discharged significantly faster by CLIQ.…”

Section: Case 1: Nb 3 Sn Quadrupole Model Magnetmentioning

confidence: 99%

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CLIQ : a new quench protection technology for superconducting magnets

Ravaioli

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Performance of HQ02, an Optimized Version of the 120 mm <formula formulatype="inline"><tex Notation="TeX"> $\hbox{Nb}_{3}\hbox{Sn}$</tex></formula> LARP Quadrupole

Cited by 20 publications

References 11 publications

Acoustic emission during quench training of superconducting accelerator magnets

Acoustic emission during quench training of superconducting accelerator magnets

Protecting a Full-Scale <inline-formula> <tex-math notation="TeX">$\hbox{Nb}_{3}\hbox{Sn}$</tex-math></inline-formula> Magnet With CLIQ, the New Coupling-Loss-Induced Quench System

CLIQ : a new quench protection technology for superconducting magnets

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