Applying Superconducting Magnet Technology for High-Efficiency Klystrons in Particle Accelerator RF Systems

Self Cite

A wind-and-react MgB2 solenoid magnet for klystrons has been developed. While the current normal-conducting (Cu) magnet consumes 20 kW per magnet, this MgB2 magnet consumes less than 3 kW in refrigerator power. The conduction-cooled half coil of the magnet is 337 mm in inner diameter; the winding pack, 19.4 mm wide × 136.6 mm high, uses 2.7 km of 10 filament circular conductor, which is insulated with glass 0.83 mm in diameter, and is reacted after being wound onto a stainless steel bobbin. The coil has Cu plates of 0.2 mm in thickness between each coil layer and on the inner and outer sides. The magnet has two coils and produces 0.8 T in the center and its stored energy is 11.8 kJ. Together with the above-mentioned coil structure, these coils can consume stored energy in itself at quench without a special quench protection system. A performance test of the magnet was successful.

Section: Introductionmentioning

confidence: 99%

Development of Prototype MGB₂ Superconducting Solenoid Magnet for High-Efficiency Klystron Applications

Watanabe

Calatroni

Koga

et al. 2020

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“…For klystron use, we need DC solenoid magnets for focusing the electron beam. The power efficiency of the magnet is important because in an design option of the Compact Linear Collider 380 GeV (CLIC-380 GeV), the number of klystron magnets reaches 4,000-5,000 [8]. The power consumption of a typical copper magnet for klystron applications is 20 kW for cooling the Joule heat of the magnet [9], and in the case of a Nb-Ti superconducting magnet without liquid helium, the AC plug power is 6 kW, as shown in a previous study [10].…”

mentioning

confidence: 99%

Performance of MgB₂ Superconductor Developed for High-Efficiency Klystron Applications

Tanaka

Suzuki

Kodama

et al. 2020

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An 8-km long MgB2 wire for a prototype klystron magnet was made and evaluated. The wire was made by a typical in situ method; it has 10 filaments and 0.67 mm in outer diameter. The homogeneity of Ic of this wire was evaluated by several methods. Deviation of Ic values in short sample wires was very small. In addition, the current sharing temperature of the MgB2 magnet (made of two reels of wire 2.9 km long each) agreed well with the estimated value of the Ic-B-T properties in short sample wires. Based on the obtained results, it can be said that the Ic properties of the entire wire length are quite uniform.

“…Applying MgB 2 technology to HL-LHC corrector magnets was also promoted by G. Volpini [12], and a sextupole corrector prototype was recently successfully tested at INFN-LASA [13]. Further developments are ongoing on solenoids for highefficiency klystrons [14], undulators [15], and beam transport magnets [16], [17], as well as on liquid hydrogen cooling [18].…”

mentioning

confidence: 99%

Proof-of-Principle of an Energy-Efficient, Iron-Dominated Electromagnet for Physics Experiments

Devred,

Ballarino,

Bourcey

et al. 2024

A number of physics experiments call for the use of iron-dominated, normal-conducting electromagnets to produce moderate fields (2 T range) in a large gap or over a large volume. Although robust and reliable, these magnets require significant electrical power, in the MW range, and can thus be costly to operate, especially in DC mode. We report on the design and test of a superconducting, proof-of-principle demonstrator that makes use of technological developments carried out for the High Luminosity upgrade of the Large Hadron Collider at CERN (HL-LHC). The demonstrator includes a superconducting coil, wound from a MgB 2 cable, and mounted inside an iron yoke with a 62 mm gap. As a first phase, the demonstrator was successfully tested in liquid helium at 4.5 K, generating a magnetic flux density of 1.95 T at a current of 5 kA. In a second phase, currently under preparation, the demonstrator will be tested in gaseous helium at 20 K. The design concepts of the demonstrator can be scaled up to large, iron-dominated electromagnets.