Upgrade of the Arc Interconnection Verification System for the Large Hadron Collider

Bednarski, M; Jurkiewicz, P.; Ludwin, Jaromir; Wojas, Damian; Bednarek, Mateusz; D'Angelo, G.

doi:10.23919/mixdes.2019.8787158

Cited by 2 publications

(3 citation statements)

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“…individual magnets, or their instrumentation such as voltage taps and quench heaters. Each test can be composed of several to few hundreds automatically performed resistance measurements using equipment described in [3], [4], [5], [6], [7], and [9].  Complex impedance measurementsperformed on complete superconducting circuits or individual magnets, at frequencies from 1 Hz to 100 kHz and stimulus current below 1 A peak.…”

Section: Tests Required For Elqamentioning

confidence: 99%

“…2) Upgrade of the automatic measurement system for validation of the interconnections between superconducting magnets [7]. This system is used whenever an LHC magnet is replaced and about 70 pairs of superconducting bus bars have to be reconnected.…”

Section: Preparation For Ls2 (2015 -2018)mentioning

confidence: 99%

“…The results of failed electrical tests of all types of measurement campaigns were examined, and when needed additional measurements were performed. For instance in case of insulation failure detected during high voltage test described in [10] it was necessary to perform measurements of the breakdown signal propagation time in bus bars of affected circuits, during repeated high voltage insulation test, in order to localize the fault. Small number of tests may be failed due to external conditions, such as electromagnetic, thermal, or mechanical disturbance during high precision resistance measurement, resulting in abnormal readout, which is then detected by automatic validation procedure.…”

Section: Identified Non-conformitiesmentioning

confidence: 99%

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Preparation and Execution of the Electrical Quality Assurance Program On the LHC Superconducting Circuits During the Second Long Shutdown

Ludwin

Bednarek

Bednarski

et al. 2021

IEEE Trans. Appl. Supercond.

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The electrical quality assurance (ELQA) of the superconducting circuits of CERN's Large Hadron Collider (LHC) during its second Long Shutdown (LS2) requires the execution of vast measurement campaigns. Each of 1658 electrical circuits as well as the instrumentation of each of the 1746 individual cryo-assemblies housing magnets, bus-bars and other components of the superconducting circuits, has to undergo a series of tests. At the beginning of the shutdown the tests are performed before and after the warmup from cryogenic temperatures. The same tests are repeated at the end of the shutdown, this time before and after the cool-down. As part of the dipole bypass diode insulation consolidation project and due to the replacement of a few non-conform magnets, additional electrical tests and measurements had to be performed throughout the shutdown period. With each measurement, electrical parameters like resistance, complex impedance, and the quality of the insulation are verified and stored for future reference. Due to the many thousands of measurements to be performed, multiple automated mobile test benches had to be developed for the different test types along with dedicated database and analysis software applications for the documentation and follow-up of the test results and the non-conformities observed. In this contribution we describe the collaborative effort between CERN and the Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences in Krakow during the three yearlong preparation process and experiences related to the execution of the ELQA activities during LS2 of the LHC.

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Section: Tests Required For Elqamentioning

confidence: 99%

Section: Preparation For Ls2 (2015 -2018)mentioning

confidence: 99%

Section: Identified Non-conformitiesmentioning

confidence: 99%

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Preparation and Execution of the Electrical Quality Assurance Program On the LHC Superconducting Circuits During the Second Long Shutdown

Ludwin

Bednarek

Bednarski

et al. 2021

IEEE Trans. Appl. Supercond.

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New Measurement Techniques Used for the Electrical Quality Assurance of HL-LHC Superconducting Magnets

Ludwin,

Bednarek,

Da Rosa

2024

IEEE Trans. Appl. Supercond.

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In preparation of the Large Hadron Collider (LHC) upgrade to High Luminosity LHC (HL-LHC), a number of new Nb3Sn magnets, including short model and prototype magnets, had to be electrically qualified. The process included a number of well-established Electrical Quality Assurance (ELQA) tests, such as electrical continuity checks of the magnet instrumentation, high-voltage (HV) insulation tests of the magnet and quench heater circuits, and impedance measurements. In certain cases, in order to fully understand the observed effects, we needed to introduce new measurement techniques, in particular both an impedance measurement at specific frequency and a HV insulation test of the quench heaters during high-current quenches of the magnet. Furthermore, in order to localize possible insulation faults, we performed HV insulation tests using an additional multichannel acquisition system with high sampling rate. In this contribution we present in detail the used measurement techniques, explain the safety aspects, and discuss the results and possible further work.

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Upgrade of the Arc Interconnection Verification System for the Large Hadron Collider

Cited by 2 publications

References 0 publications

Preparation and Execution of the Electrical Quality Assurance Program On the LHC Superconducting Circuits During the Second Long Shutdown

Preparation and Execution of the Electrical Quality Assurance Program On the LHC Superconducting Circuits During the Second Long Shutdown

New Measurement Techniques Used for the Electrical Quality Assurance of HL-LHC Superconducting Magnets

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