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• W2062569981 abstract "LARGE SUPERCONDUCTING DETECTOR MAGNETS WITH ULTRA THIN COILS FOR USE IN HIGH ENERGY ACCELERATORS MiD STORAGE RINGS. H. A, Green Lawrence Bemeley Laboratory llo1.versity of California Beme1ey, california MASlIR This paper describes the development of a ni!W class of large superconducting soleiwid magJ!l!ts. High energy physics on colJ,iding beam machines sometimes require the use of thin coH' solenoid magnets. ,The development of these ,magnets bas proceeded with the substitution of li'ght materials for heavy materials and by ,inCrea9ing the current density in the coils. The Lawrence Beme1ey Laboratory bas developed a 1:adtca1 approach to the pEOblem by ba'ldng the co11 operate at very high cur1:ent, densities. This approach and its implications are described in detail. Introduction Recent'developments in colliding beam physics have prompted the development of thin superconductiog solenoid magnets for use ia these experiments. The development of thin m3g0ets can be traced starting with PLUTO, the fi1:st superconducting magnet which was used to do colliding beam physics. The evolution of thin coil technology can be trsced by comparing PLUTO (which is not a thin superconducting magnet) with three other superconductiog magnets which have been built OT are being built for colliding beam experiments. All tbree of these magnets are 'designed to be thin to some degtee. A comparative' study of the four magnets illustrstes the trend of thin supercooducting co11 development over tbe last two D1: three years. first, Doe sees tbe substitution of lighter materials for heavier msterials in the CERN magnet. Then ooe sees the abandoDlll!nt of cryogeoic stsbility wben the batb cryostat is replaced witb tbe tubular cooling system in the CELLO magnet. F1oslly, tbe conductive bore tube concept is introduced in order to make a radical improvement in the ,protection' of thin solenoid magnets against burnout. This is the basis of the TPC magnet design proposed by the Lawrence Berkeley Laboratory (LBL). Over half of this pap'er will be devoted to the LBL magnet 'technique. Since the LBL tecb- nique is a radical departure from conventioosl technique, this paper will present tbe theory of the conductive bore tube and discuss the resulta of experiments on LBL test coils. Three test c.oils· have been c.onstruc.ted at LBL. Two of these coUs, each with a diameter of one meter. have been fully tested and the results are presented herein. Preliminsry tests on the third test 'magnet, which bas a diameter of two meters, are described. The results' of these tests show the viability of the LBL two-phase tubular cooling system and the conductive bore tube for diverting the magnetic current from the superconducting coil. The LBL technique ia applicable to magnets in a variety of sizes. The radiation thickness attainable is a function of diameter and central induction. Thia relaticoship is sbown in this pape::. In addition, one can apply light sUperconductors and conductive bore tubes. This can, in principle, result in reduction of the radiation thickness of solenoids whicb bave a diam- eter below a certain value. t a The development of thin solenoid technology The 'development of thin nagnet technology can be traced by comparing four colliding beam detector solenoids which have been built or are about to te built. The first of these magnets is PLUTO. This magnet, which makes no effort to bj! thin, was built in 1971 using tbe conductor and stabilization technology used in the large bubble cbsmber(l). The second magnet, ISR, built by Horpurgoat' CERN' in 1976, Bub Q !ltuted a cryt;>genica11y stabilized allllll1J1um conductor for th~ ciJpperc< iductor normally used l ). The vacuum ve,.sela and cryostat vessels are also msde of aluminum; The third step iil this progression is the msgnet, proposed for the CELLO elCPertment by !;aclsy and',Karlsrube using ilitrinaically stable aluminum conductor which operates 'at current densitieS' of 1.4 x 108 &-2(3). The fourth step 1n the progress10n is represented by the magni!t proposed for the time projectiOn cblllltJer (TPC) experiment by the Lawrence Beme1ey Laboratol.y(4). This magDet, uses superconductor at very high matrix current densities (about 109 Am- 2 h' - The msgriet uses a tVo-pbase tubular COOling system. The ,four magnets ':e clllllpsred in Table 1. The PLUTO magnet bas the largest central inductiOn 'and ~est free wI ,. ,The TPC magnet has both the,largest free volume and stored eaergy. The ISR '!liagnet bas the alliallest stored energy end i t has a central induction of 1.S T lik'l the CELLO ana' TPC magnets. The thiekeBt magnet from a radiation standpOint is' the PLUTO magnet. The,' thinnest magnet ia the TPC magnet. * Work performed urier tbe auspices of U.S. Energy Research and Develo~,,,!l'S ~~ois~st1oi? .. ' UI.:j ~ ,(Ial l 110. 1 ,ur ,U'.I~' t..U" @default.
• W2062569981 created "2016-06-24" @default.
• W2062569981 creator A5011301769 @default.
• W2062569981 date "1977-08-01" @default.
• W2062569981 modified "2023-09-25" @default.
• W2062569981 title "LARGE SUPERCONDUCTING DETECTOR MAGNETS WITH ULTRA THIN COILS FOR USE IN HIGH ENERGY ACCELERATORS AND STORAGE RINGS" @default.
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