Development of the Joints for ITER Central Solenoid

Martovetsky, N.; Kenney, S.J.; Miller, J.R.

doi:10.1109/tasc.2010.2100344

Cited by 11 publications

(10 citation statements)

References 3 publications

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“…The details of the racetrack configuration and test procedure in the JTA are described in detail in [1], [2]. Figure 2 shows a racetrack during fabrication, prior to copper sleeve compaction over the joint.…”

Section: Sample Preparationmentioning

confidence: 99%

“…HE pancake-to-pancake joint was developed [1] and qualified [2] by the US ITER Project Office (USIPO). The brief assembly procedure is as follows: The cable is made of superconducting and copper strands coated with chromium (Cr), about 1.5 µm thick.…”

Section: Introductionmentioning

confidence: 99%

“…The fabrication process of the sintered joint is given in detail in [1], [2], and the schematic of the joining subcables is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Chrome Coating on Resistance of Sintered Joint for ITER Central Solenoid

Martovetsky

Irick

2014

IEEE Trans. Appl. Supercond.

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Abstract-The ITER Central Solenoid has 36 interpancake joints. The joints are required to have resistance below 4 nOhm at 45 kA at 4.5 K. The US ITER Project Office developed and qualified a sintered joint for the interpancake joints that consistently showed exceptionally low DC resistance of 0.13 nOhm at up to 80 kA in the self-field of about 1.5 T. To provide a good current distribution in the joint, we removed chrome plating from the strands in this area.We built and tested four samples of the sintered joints before 2012. Such a low resistance prompted an investigation of the possibility of leaving the chromium on the strands during the joint preparation and still staying well below allowable resistance. Although removal of the chrome plating is not a very labor-intensive or time-consuming operation, it requires handling of harmful fumes and produces a solution containing hexavalent Cr, which is a hazardous substance. Elimination of the Cr removal step is a simplification of the fabrication process and therefore is a desirable act. We built two identical racetrack samples of the sintered joint and tested them in our joint test apparatus. One sample had Cr removed from the strands, the other had Cr intact.This paper provides a description of the test samples, fabrication steps, and results of the DC resistance measurements. 

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Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Chrome Coating on Resistance of Sintered Joint for ITER Central Solenoid

Martovetsky

Irick

2014

IEEE Trans. Appl. Supercond.

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“…Then the copper sleeve is compacted over the cable with a commercial crimper to the desired dimension that provides a void fraction in the cable area of 20%, excluding the central hole. Such compaction was demonstrated [2] to provide low interstrand resistance. The tube is strong enough to withstand the compacting pressure; the spring would have collapsed or damaged the strands at the points of contact, as had happened in the past.…”

Section: Compaction Of the Terminationsmentioning

confidence: 99%

“…Thus, a total of four bus joints were tested. Electrical resistance of the racetrack in a Joint Test Apparatus (JTA) that was built by the US ITER in 2009 [2] was measured in order to measure the electrical resistance of the joints for the ITER CS and was used for development and qualification of the CS interpancake joints [1,2]. The JTA is a superconducting transformer in which the primary winding induces a current in the racetrack containing the joints.…”

Section: Measurements Of the Joint Resistancementioning

confidence: 99%

Development of the bus joint for the ITER Central Solenoid

Martovetsky¹,

Irick²,

Kenney³

2013

Fusion Engineering and Design

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A B S TRACTThe terminations of the Central Solenoid (CS) modules are connected to the bus extensions by joints located outside the CS in the gap between the CS and Torodial Field (TF) assemblies. These joints have very strict space limitations. Low resistance is a common requirement for all ITER joints. In addition, the CS bus joints will experience and must be designed to withstand significant variation in the magnetic field of several tenths of a Tesla per second during initiation of plasma. The joint resistance is specified to be less than 4 nOhm.The joints also have to be soldered in the field and designed with the possibility to be installed and dismantled in order to allow cold testing in the cold test facility. We have developed coaxial joints that meet these requirements and have demonstrated the feasibility to fabricate and assemble them in the vertical configuration. We introduced a coupling cylinder with superconducting strands soldered to the surface of the cable that can be installed in the ITER assembly hall and at the Cold Test Facility. This cylinder serves as a transition area between the CS module and the bus extension.We made two racetrack samples and tested four bus joints in our Joint Test Apparatus. Resistance of the bus joints was measured by a decay method and by a microvoltmeter; the value of the current was measured by the Hall probes. This measurement method was verified in the previous tests. The resistance of the joints varied insignificantly from 1.5 to 2 nOhm.One of the challenges associated with a soldered joint is the inability to use corrosive chemicals that are difficult to clean. This paper describes our development work on cable preparation, chrome removal, compaction, soldering, and final assembly and presents the test results.

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Qualification activities of the spliced joint for CFETR

Lü

Shen

et al. 2022

Annals of Nuclear Energy

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Development of the Joints for ITER Central Solenoid

Cited by 11 publications

References 3 publications

Effect of Chrome Coating on Resistance of Sintered Joint for ITER Central Solenoid

Effect of Chrome Coating on Resistance of Sintered Joint for ITER Central Solenoid

Development of the bus joint for the ITER Central Solenoid

Qualification activities of the spliced joint for CFETR

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