Longitudinal compression oC a tailored-vciocity, intcmc neutralized ion heam hns been demonstmtcd. The compression tnlm plnec in a 1-2 m driit seetion Blled with plam~n to provide spacedierge neutduntioo. An induction cell produces a head-to-tnil velocity ramp that longitudinally compresses theneutrdized beam, enhancingthe b-peak current hyafndor of 50 audprodudag a pulse duration OC about 3 us. T h i s m m e m e n t hns been confirmed indopmdsntly with two darercot diagnostic eystems. The simultaneous l m v e r a e nnd longihdinal compression oI an ion heam is reguired t o achieve the high intensities necrssnry to create high energy density matter and fusion conditions. A recent driver study for inertial fusion, for Longitudinal compression of space-chargedominated beams has been studied extensively intheory and simulations [ll-E]. The compression is initiated by imposing a linear head-to-tail velocity tilt to a driitiig beam. Longitudinal space-&urge forces limit the beam compression ratio, the ratio oI the initial to i i nmal current, to about ten in most applications. iments on NDCX. To provjde the head-ta-tail velocity tilt, aninduction module withvariablewltagewaveronn is placed immedintely downstream of the last quadrupole mnpet. This is IoUmved hy a neutralized drii section which consists of a one -meter-long plasma column produced hy an AI cathodic cm: [ZO]. A diagnostic hmc is located at the downstream end of the plwarna column Thebeampmducedfromthesourcehasa5 paflat-top. The inductiontit voltage 'c~rves' out a -300 115 segment ofthe flat-top which compresseslongitudinallyas it driits through the plasma column. The final compressed beam is m e w e d in the dormetrenm diagnostic box.The induction cell consists oi 14 independently-driven magnetic cores in a preastnizad gas @Fa) region that is separated Erom the vnouum by a conventional high voltage insulator. The rvnveforms applied t o the 14 coria inductively add at the acceleration gap. Each core is driveu by a thyratronawitched modulator. Because the modulntor for each core can be designed to produce different waveiorms and can be triggered independently, a variety or wavdorms CM bs produced nt the acceleration gap using the 14 discrete building bloclw.The plasma column is formed hy two pulsed a u m i n u m cathodic arc sources loceted at the d m s t r e a m ond. Each source is equipped with a 45O open-arcutechm

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The Heavy-Ion Fusion Sciences Virtual National Laboratory is pursuing an approach to target heating experiments in the Warm Dense Matter regime, using space-

A b s W t -A superconducting magnet usssmbly Bar Been built for rm ECR (Electron Cyclotron Resonarm$ Ion sowce at the 88~inch cyclohoti at LBL'. Three 34-cm ID solenoids provide axhl plasma cotijintw" and U sexfupole ussembly in the solenoid bore provides radial stabill@. Two large solenoid8 are spaced SO em. npwi with a smaller opposing solenoid bedween. The sexlupole ussembly is 92 cm long with winding inner diameter of 20 cm. and outer diameter of 27.2 em. Tfis design goat is fo achieve afield on axis of 4 T und 3 T a t the mirrors with 0.4 T behvees and a sexfapole field of 2.0 T at IS-cm diumeter iti the confinement volume. Emfr solenoid uses rectrsngrrlar conductor wtth mpper/'SC ratio of 4; flie three coils are wet-wound on a one-piece aluminlrm bobbin with aluminum bnndti!g for rudiui suppord. The sexapole uses rectangular conductor with copper/SC ratio of 3. EacR of the 6 eoik is wet-wound with filled epoxy ori a metal pole; the ends of the pole are ahminum and the central 34-cm h lron to augment the sextupokfldd. The a& coils me assembled on a 2O-cni4lD stainless steel hrbe with a I.4-cm thick 30.0.cm OD aluminum tribe over the assembly for striictural support. Thin metal bludders are exparrded adtnut!ially behveen each coil axially ab the ends to pre-load the assembly, The sexhrpob assembbflts inside lire solenoid bobtin, wlikb provMes support for the magnetic forces. The magnet exceeds design requirements with ni inim um training.

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