Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade

Ghoshal, Probir K.; Bachimanchi, Ramakrishna; Fair, Ruben; Gelhaar, David; Kumar, O. Rajesh; Philip, Sarin; Todd, Mark

doi:10.1109/tasc.2017.2759280

Cited by 6 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All other coil failure modes see lower temperature excursions than that experienced for the single coil quench case. The 0.124 Ω dump resistor extracts >50% of the stored energy with a maximum terminal voltage < 500 V (± 250 V with the dump resistor having a center tap configuration) [5,[7][8]. The current decay in the event of a quench, or a fast dump is enhanced by the growing normal zone which increases the coil resistance.…”

Section: Magnet Protectionmentioning

confidence: 99%

“…A more detailed description of the magnetic and structural design is covered in [5]. JLab designed the magnet, including all electromagnetic, electro-mechanical, thermal, vacuum, cryogenics, I&C, and magnet protection sub-systems [6][7][8][9]. Manufacturing process design, coil winding, and potting of the CCM assemblies were performed by Fermilab (FNAL) [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Commissioning Validation of CLAS-12 Torus Magnet Protection and Cryogenic Safety System

Ghoshal

Biallas

Fair

et al. 2018

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

This paper provides an overview of a test to confirm how the electromagnetic loss and energy balance in the CLAS12 Torus magnet system affects the cryogenics system in the event of a fast dump or quench. The test was a part of the commissioning activities within Hall B for the 12 GeV Accelerator Upgrade project at Jefferson Lab in November 2016. The test, as carried out, validated the design of the torus magnet protection and cryogenic safety systems. This magnet is unique in that it comprises 6 superconducting coils which are individually conduction-cooled by helium, thereby providing an element of thermal and mechanical decoupling between the coils. As such its behavior under a fast dump condition (and even a quench) is markedly different from that of more conventional bath-cooled superconducting magnets.

show abstract

Section: Magnet Protectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Commissioning Validation of CLAS-12 Torus Magnet Protection and Cryogenic Safety System

Ghoshal

Biallas

Fair

et al. 2018

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Salient MPS and energy dump specifications are given in Table XIX. The power supply is designed to react to a quench, which is detected by a set of hard-wired quench detector electronic units, and automatically switch power off to the magnet [28]. The hardwired quench detection subsystem acts directly to open the dump switch as part of the primary protection system.…”

Section: Superconducting Magnet DC Power Supplymentioning

confidence: 99%

“…The magnet Quench Protection System (QPS) was developed for both magnets based on the analysis of several quench scenarios and is comprised by primary and secondary subsystems [28].…”

Section: Magnet Quench Protection and Control Electronicsmentioning

confidence: 99%

The CLAS12 superconducting magnets

Fair¹,

Baltzell²,

Bachimanchi³

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

“…Instead of a bridge circuit, it is also possible to compensate the inductive component with differential amplifiers [134]. However, this requires a more complicated design with increased reliance on electronics.…”

Section: Detection Methodsmentioning

confidence: 99%

Conduction-cooled ReBCO coils for the wind converter: from laboratory to field test

Bergen

View full text Add to dashboard Cite

Practical high-current applications of low-temperature superconductors (LTS) include magnetic resonance imaging, nuclear magnetic resonance and large magnet systems for high-energy physics and nuclear fusion. Higher magnetic fields and higher operating temperatures require a changeover to high-temperature superconductors (HTS) such as ReBCO. These ceramic materials have a critical temperature T c above the normal boiling point of nitrogen, which in principle allows them to be cooled by liquid nitrogen instead of liquid helium. Using liquid nitrogen instead of liquid helium can simplify the design of the cooling system for the superconducting application. A disadvantage of such a 'wet' magnet is the limited operating temperature range and the requirement of periodic refills which is problematic in the case of non-continuous supply of the cryogenic liquid. Use of cryocoolers, on the other hand, allows the superconducting magnet to be conduction-cooled also to intermediate temperatures. Gifford-McMahon type crycoolers are most commonly used today due to their relatively low cost and high reliability. The

show abstract

Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade

Cited by 6 publications

References 5 publications

Commissioning Validation of CLAS-12 Torus Magnet Protection and Cryogenic Safety System

Commissioning Validation of CLAS-12 Torus Magnet Protection and Cryogenic Safety System

The CLAS12 superconducting magnets

Conduction-cooled ReBCO coils for the wind converter: from laboratory to field test

Contact Info

Product

Resources

About