Characterization of Prototype Superconducting Magnetic Quadrupolesfor the High Current Transport Experiment

Lund, Steven M. ; Sabbi, GianLuca ; Seidl, Peter

Lawrence Berkeley National Laboratory

关键词: Lawrence Livermore National Laboratory;    Excitation;    Economics;    Specifications;    Quadrupoles;   

DOI  :  10.2172/860234
RP-ID  :  LBNL--58937
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  860234

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来源: UNT Digital Library

【 摘 要 】

Later phases of the High Current Transport Experiment (HCX) at LBNL will employ superconducting magnetic quadrupole lenses to focus an intense, heavy-ion beam over approximately 50 lattice periods (100 quadrupoles). Here they present a characterization of a baseline quadrupole design suitable for transporting a single, low-energy ({approx} 2 MeV), high-current ({approx} 800 mA) heavy-ion (K{sup +}) beam that will be provided from an existing injector and beam matching section. For optimal performance in this application, a compact quadrupole magnet providing high focusing strength and high field quality is required. The reference parameters that they have chosen take into account magnet development work by AML, LLNL, and MIT and result in a transport lattice well matched to programmatic needs with a lattice period of approximately 50 cm. The goal of this note is to introduce a common framework where the magnetic performance of different designs can be compared. In that regard, they try to avoid the details of an earlier parameter note [1] where provisions for tweaks in magnet excitation, cryostat assembly, etc. were discussed in fairly general terms. This note is not intended to be a final specification for the HCX quadrupoles to be constructed or to be the sole basis on which competing magnet designs will be compared. Other aspects such as prototype test results, economic considerations, and attractiveness within the context of ultimate applications in multi-beam drivers for heavy-ion fusion (i.e, compatibility with magnet arrays, etc.) will all factor in the selection of the appropriate design option. This note is organized as follows. Magnet characterizations including geometric and conductor parameters are given in Sec II. Performance parameters to be reported that quantify the magnet properties are outlined in Sec III. Supporting information is included in appendices. A reference coordinate system to be employed in field calculations is defined in Appendix A. Detailed descriptions of the methods to be used to calculate the integrated field gradient and field errors of the magnet are given in Appendix B. Finally, in Appendix C, the magnet operating point is defined.