MOCOCK —  New Development & Status   (23-Aug-10   14:00—15:50)
Chair: T. Nakagawa, RIKEN Nishina Center, Wako, Japan

Paper	Title	Page
MOCOCK01	PK-ISIS: a New Superconducting ECR Ion Source at Pantechnik	26
	A.C.C. Villari, C. Bieth, W. Bougy, B.N. Brionne, X. Donzel, G. Gaubert, R. Leroy, A. Sineau, O. Tasset, C. Vallerand PANTECHNIK, BAYEUX, France T. Thuillier LPSC, Grenoble, France
	The new ECR ion source PK-ISIS was re­cent­ly com­mis­sioned at Pan­tech­nik. Three su­per­con­duct­ing coils gen­er­ate the axial mag­net­ic field con­fig­u­ra­tion while the ra­di­al mag­net­ic field is done with mul­ti-lay­er per­ma­nent mag­nets. Spe­cial care was de­vot­ed in the de­sign of the hexap­o­lar struc­ture, al­low­ing a max­i­mum mag­net­ic field of 1.32 T at the wall of the 82 mm di­am­e­ter plas­ma cham­ber. The three su­per­con­duct­ing coils using Low Tem­per­a­ture Su­per­con­duct­ing wires are cooled by a sin­gle dou­ble stage cryo-cool­er (4.2 K). Cryo­gen-free tech­nol­o­gy is used, pro­vid­ing re­li­a­bil­i­ty, easy main­te­nance at low cost. The max­i­mum in­stalled RF power (18.0 GHz) is of 2 kW. Metal­lic beams can be pro­duced with an oven (Tmax = 1400 °C) in­stalled with an angle of 5° with re­spect to the source axis or a sput­ter­ing sys­tem, mount­ed in the axis of the source. The beam ex­trac­tion sys­tem is con­sti­tut­ed of three elec­trodes in ac­cel-de­cel con­fig­u­ra­tion. De­scrip­tion of the source and re­sults of the mag­net­ic mea­sure­ments will be given. Per­for­mances of the source in terms of beam in­ten­si­ties and charge states dis­tri­bu­tion will be pre­sent­ed.
	Slides MOCOCK01 [3.226 MB]
MOCOCK02	3D Simulation Studies and Optimization of Magnetic Holes of HTS-ECRIS for Improving the Extraction Efficiency and Intensities of Highly Charged Ions	27
	G. Rodrigues, R.N. Dutt, D. Kanjilal, P.S. Lakshmy, Y. Mathur, U.K. Rao, A. Roy IUAC, New Delhi, India R. Baskaran IGCAR, Channai, India
	3D sim­u­la­tion stud­ies using RADIA code have been per­formed to op­ti­mise the mag­net­ic holes in high tem­per­a­ture su­per­con­duct­ing elec­tron cy­clotron res­o­nance (HTS-ECRIS) ion source for im­prov­ing the ex­trac­tion ef­fi­cien­cy and in­ten­si­ties of high­ly charged ions. The mag­net­ic field im­prove­ments using sim­ple tech­niques like op­ti­mi­sa­tion of iron re­gions is found to be eco­nom­i­cal. The ex­trac­tion ef­fi­cien­cy can be in­creased three-fold in the case of a hexapole mag­net de­pend­ing on the level of the uni­for­mi­ty of the fields in the high and low re­gions. This tech­nique fur­ther min­imis­es lo­cal­ized heat­ing of the plas­ma cham­ber walls which can im­prove the vac­u­um con­di­tions in an ECR ion source. For su­per­con­duct­ing sources where the x-ray heat load poses se­vere prob­lems dur­ing op­er­a­tion, such a re­duc­tion of heat­ing load is of great sig­nif­i­cance. The typ­i­cal tri­an­gu­lar pat­tern of the plas­ma im­pact ob­served on the plas­ma elec­trode of HTS ECRIS at var­i­ous tun­ing con­di­tions are re­pro­duced by the sim­u­la­tions. De­tails of the sim­u­la­tions and ex­per­i­men­tal re­sults will be pre­sent­ed.
	Slides MOCOCK02 [2.925 MB]
MOCOCK03	Design Study of a Higher Magnetic Field SC ECRIS at IMP	30
	D. Xie, W. Lu, X.Z. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	De­vel­op­ment of ECR ion source has demon­strat­ed that, as the em­pir­i­cal scal­ing laws sum­ma­rized, high­er mag­net­ic field with high­er op­er­a­tion fre­quen­cies will great­ly im­prove the source per­for­mance. Based on the great suc­cess of SE­CRAL, a high­er mag­net­ic field SC ECRIS is planned to meet the new ac­cel­er­a­tor de­mands at IMP. How­ev­er, there are many prac­ti­cal is­sues in the de­sign and con­struc­tion of a high­er field SC ECRIS that need to be ad­dressed. In this paper we will pre­sent and dis­cuss the de­sign fea­tures of the high­er field SC ECR with a max­i­mum axial field of 7.0 T and a ra­di­al field of 3.5 T at the plas­ma cham­ber inner sur­face, and op­er­at­ing fre­quen­cy up to 50 GHz.
	Slides MOCOCK03 [1.825 MB]
MOCOCK04	Measurement of the Sixty GHz ECR Ion Source using Megawatt Magnets - SEISM Magnetic Field Map	33
	M. Marie-Jeanne, J. Jacob, T. Lamy, L. Latrasse LPSC, Grenoble Cedex, France F. Debray, J. Matera, R. Pfister, C. Trophime GHMFL, Grenoble, France
	LPSC has de­vel­oped a pro­to­type of 60GHz Elec­tron Cy­clotron Res­o­nance (ECR) Ion Source called SEISM. The first 60GHz mag­net­ic struc­ture is based on a cusp ge­om­e­try, using re­sis­tive poly­he­lix coils de­signed in col­lab­o­ra­tion with the In­tense Mag­net­ic Fields Na­tion­al Lab­o­ra­to­ry (LNCMI). A ded­i­cat­ed test bench he­lices coils in their tanks, elec­tri­cal, and water cool­ing en­vi­ron­ment was built to study the me­chan­ics, ther­mal be­haviour and mag­net­ic field char­ac­ter­is­tics ob­tained at var­i­ous cur­rent lev­els. Dur­ing the last months, mea­sure­ments were per­formed for sev­er­al mag­net­ic con­fig­u­ra­tions, with up to 7000A ap­plied on the in­jec­tion/ex­trac­tion coils set. The mag­net­ic field achieved at 13000A is ex­pect­ed to allow 28GHz ECR con­di­tion. How­ev­er, cav­i­ta­tion is­sues that ap­peared around 7000A are to be solved be­fore car­ry­ing on with the tests. This con­tri­bu­tion will re­call some of the cru­cial steps in the pro­to­type fab­ri­ca­tion, and show pre­lim­i­nary re­sults from the mea­sure­ments at 7000A. Pos­si­ble ex­pla­na­tions for the dis­crep­an­cies ob­served be­tween the re­sults and the sim­u­la­tion will be given.
	Slides MOCOCK04 [3.243 MB]
MOCOCK05	Multigan®: a New Multicharged Ion Source Based on Axisymetric Magnetic Structure	37
	L. Maunoury, P. Delahaye, M. Dubois, P. Jardin, P. Lehérissier, M. Michel, J.Y. Pacquet GANIL, Caen, France S. Biri ATOMKI, Debrecen, Hungary X. Donzel, G. Gaubert, R. Leroy, A.C.C. Villari PANTECHNIK, BAYEUX, France C. Pierret CIMAP, Caen, France
	Stan­dard ECR ion sources have ra­di­al mag­net­ic field cre­at­ed by a mul­ti-pole, e.g. hexapole or high­er order, which fills all space in the cen­ter of the source struc­ture. Based on the Mono­gan® ECRIS [1] con­cept, a new mul­ti­charged ECR ions source has been de­signed with a large open­ing space in the cen­ter of the source struc­ture. This par­tic­u­lar de­sign al­lows, in a first ap­proach, di­rect ra­di­al con­tact with the ECR plas­ma, al­low­ing po­si­tion­ing of probes and tar­gets for ra­dioac­tive beam pro­duc­tion very close to the plas­ma re­gion. Sec­ond­ly, the ab­sence of a mul­ti-pole al­lows con­sid­er­ing ex­treme­ly high mag­net­ic fields with sig­nif­i­cant­ly small­er struc­tural con­straints. This source is com­bin­ing the ad­van­tages of the ax­isy­met­ric mag­net­ic fea­ture of Mono­gan® with high­er fre­quen­cies. This paper will de­scribe the mag­net­ic struc­ture cal­cu­la­tion as well as the me­chan­i­cal de­sign and stress­es of a full per­ma­nent mag­net ion source using this con­cept. This source will be the first pro­to­type of such an ECR ion source. Fi­nal­ly, using Trap­Cad code [2], an es­ti­ma­tion of the elec­tron­ic en­er­gy dis­tri­bu­tion has been cal­cu­lat­ed and thus, the per­for­mance of the source has been de­duced. The beam for­ma­tion and ex­trac­tion were also rough­ly cal­cu­lat­ed tak­ing into ac­count mag­net­ic and elec­tric fields. [1] P. Jardin et al., Review of Scientific Instruments, 73, 789 (2002). [2] L. Maunoury et al., Plasma Sources Science and Technology , 18, 015019 (2009).
	Slides MOCOCK05 [5.532 MB]