• Title/Summary/Keyword: triplet superconductivity

Search Result 14, Processing Time 0.035 seconds

Control the length of beam trajectory with a quadruple triplet for heavy ion accelerator

  • Wei, Shaoqing;Zhang, Zhan;Lee, Sangjin;Kim, Do Gyun;Kim, Jang Youl
    • Progress in Superconductivity and Cryogenics
    • /
    • v.18 no.4
    • /
    • pp.40-43
    • /
    • 2016

  • Beam trajectory is needed to be controlled in heavy ion accelerator system. Quadruple magnets are widely used in heavy ion accelerator for focusing the transporting particles. A quadruple triplet system which consists of three consecutive quadrupoles, Q1, Q2 and Q3, is used to control beam trajectory at a focused position. Q1 and Q3 have symmetry with respect to Q2. The beam trajectory in magnet system is affected by higher order fields existed in real fields. For quadrupoles, the representation simulation of beam trajectory was carried out to study the beam trajectory and to estimate an effect of higher order field in triplet system. SCALA program was used to simulate the beam trajectory in $Opera^{TM}$. SCALA can analyze a large number of beam trajectories at the same time by adjusting the size of finite element of the emitter. With $Opera^{TM}$ and $Matlab^{TM}$ programs, the position of focused beam spot in quadruple triplet system can be increased or decreased using evolution strategy (ES) method, therefore the length of triplet system can be controlled. Finally, the quadruple triplet system with the appropriate length and expected beam spot range was suggested in this paper.

  • https://doi.org/10.9714/psac.2016.18.4.040 인용 PDF KSCI

Design of an Air-Core HTS quadruple triplet for a heavy ion accelerator

  • Zhang, Zhan;Wei, Shaoqing;Lee, Sangjin
    • Progress in Superconductivity and Cryogenics
    • /
    • v.18 no.4
    • /
    • pp.35-39
    • /
    • 2016

  • In recent years, high-temperature superconductor (HTS) Quadruple Triplets are being developed for heavy ion accelerators, because the HTS magnets are suitable to withstand radiation and high heat loads in the hot cell of accelerators. Generally, an iron yoke, which costs a mass of material, was employed to enhance the magnetic field when a quadrupole magnet was designed. The type of the magnet is called iron-dominated magnet, because the total magnetic field was mainly induced by the iron. However, in the HTS superconductor iron-dominated magnets, the coil-induced field also can have a certain proportion. Therefore, the air-core HTS quadrupole magnets can be considered instead of the iron-core HTS quadrupole magnet to be employed to save the iron material. This study presents the design of an air-core HTS quadruple triplet which consists three by air-core HTS quadruple magnet and compare the design result with that of an iron-core HTS quadruple triplet. First, the characteristics of an air-core HTS quadrupole magnet were analyzed to select the magnet system for the magnetic field uniformity impairment. Then, the field uniformity was improved(< 0.1%) exactly using evolution strategy (ES) method for each iron-core HTS quadrupole magnet and the air-core HTS quadruple triplet was established. Finally, the designed air-core triplet was compared with the iron-core HTS quadruple triplet, and the results of beam trajectories were presented with both the HTS quadruple triplet systems to show that the air-core triplet can be employed instead of the iron-core HTS triplet. The design of the air-core quadruple triplet was suggested for a heavy ion accelerator.

  • https://doi.org/10.9714/psac.2016.18.4.035 인용 PDF KSCI

Miniature J-T Refrigerator Using Triplet Heat Exchanger (Triplet 열교환기를 사용하는 소형 J-T 냉동기)

  • Hwang, G.;Jeong, S.
    • Progress in Superconductivity and Cryogenics
    • /
    • v.11 no.1
    • /
    • pp.60-63
    • /
    • 2009

  • Most J-T (Joule-Thomson) refrigerators use a Giaque-Hampson type heat exchanger due to its excellent thermal performance and compactness. The cryoprobe (cryosurgical probe) treating prostate cancer usually has a dimension of 17 gauge (1.6 mm diameter), so it does not have enough space to bear a Giaque-Hampson type heat exchanger. In this paper, the triplet heat exchanger is adopted as the heat exchanger of cryoprobe, and the performance is investigated with an experimental test. The result shows that the triplet heat exchanger can be substituted for Giaque-Hampson type heat exchanger in the application of cryosurgery.

  • https://doi.org/10.9714/psac.2009.11.1.060 인용 PDF KSCI

Stability of Triplet NbTi Cable-In-Conduit Conductor (NbTi 관내 3연선 도체의 안정성)

  • Jang, H.M.;Oh, S.S.;Ha, D.W.;Ha, H.S.;Bae, J.H.;Kim, S.C.;Ryu, K.S.;Wang, Q.L.
    • Proceedings of the KIEE Conference
    • /
    • 1998.07a
    • /
    • pp.82-84
    • /
    • 1998

  • The normal zone propagation velocity and minimum quench energy (MQE) of cable-in-conduit conductors (CICC) has been investigated at the different background magnetic fields and supercritical helium pressures. The sample CICC of 2 m in length was fabricated with triplet NbTi/Cu strands inserting into a round stainless-steel tube. The heat pulse disturbance with duration time about 400 ms was acted on the center region of the CICC to quench the strands. The normal zone propagation velocity increased with operating current of the CICC. The measured velocity with respect to operation current could be fitted with numerical results.

  • PDF