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Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, 2003 1 CW input of RI A new prototype of super buncher for RI ~ 100 % efficiency No energy dispersion.

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Presentation on theme: "Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, 2003 1 CW input of RI A new prototype of super buncher for RI ~ 100 % efficiency No energy dispersion."— Presentation transcript:

1 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, CW input of RI A new prototype of super buncher for RI ~ 100 % efficiency No energy dispersion Valve as rapid as possible Beta- beam facility (not visible on the picture)

2 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, ECR technique for RIB production 1 – « Slow ionization » Low density / long confinement / slow rising time / 1+ ionization / charge breeding / bunching / high efficiency 2 – « Rapid ionization » Higher density / shorter confinement / faster rising time High current / short pulsed development 3 – « Super bunching and ionization efficiency » With very high density plasma, is an « ECR-Duoplasmatron » possible ?

3 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, Ion production of gaseous element or metallic ion inside a very high temperature cavity To pump i.e. defined by the conductance of the extraction hole Dominant if ioni >> ext To beam i.e. defined by the « ionic pumping » of the plasma Dominant if ioni ext 1+1+ recycling TargetIon source plasma Atoms diffusion in molecular regime Ionization and diffusion in a magnetized plasma

4 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, Ionization time and mean free path of ionization ext 1-3 mm A° A+A+ ioni n e, T e some cm ioni = v Ti e n e T i = 1/10 eV V Ti = cm/s T e = 50 eV V Te = cm/s ioni cm -2 (from 0 + to Ar + ) cm 3 /s ioni = 0.7 cm at n e cm GHz 7 cm at n e cm GHz 0.07 cm at n e cm GHz ioni = 1 µs 10 µs 0.1 µs 100 % efficiency and rapid ionization only if ioni e/cm -3

5 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, ionization of ions with ECR ion source From Fredrik Wenander, Jacques Lettry, Nicolas Chritin, Ermanno Barbero, W. Pirkl, ISOLDE, CERN and G. Gaubert, P. Jardin, R. Leroy, et al., GANIL, Caen GANIL / Picogan 10 GHz the smallest ECRIS : L, 3 cm GANIL / ISOLDE MONOECRIS GHz release (50%) He ~ 20% 20 ms Ne ~ 35 % 30 ms Ar ~ 95% 40 ms Kr ~ 95% 40 ms ( Ar ) ~ 70%

6 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, ECR Charge breeding for CW operation n+ Faraday Cup 1+ Faraday Cup 1+ source n+ spectrometer 1+ spectrometer Vertical pulsation Double Einzel lens PHOENIX Booster Direct injection of atoms (gaseous ions only) simple confinement Direct injection of 1+ beams (gaseous or metallic ions) sophisticated confinement Ne 1+ Ne % release tens of ms Ne 1+ Ne % release tens of ms Release : i.e. recycling + magnetic trapping PHOENIX – ISN/SSI GANIL Nanogan /SPIRAL

7 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, ECRIT charge breeding and bunching From : T. Lamy et al., Institut des Sciences Nucléaires UJF-IN2P3-CNRS, Grenoble, France R.F. Power Rb 1+ Injection Rb n+ Extracted t H.F. OFF ON t t inj OFF ON t H.F. 300 ms to 2 s t inj 20 ms to t H.F. t 0 to 1.5 s Standard Values : = 2.2 % (Rb ions) i.e. half of the CW 1 - Efficiency measurement of afterglow process 2 - Promizing results for ms and more, bunches of metallic ions 3 - Afterglow time difficult to control

8 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, CERN duoplasmatron for H+ production the perfect time structure for the synchrotrons Very good time structure Very short confinement (some µs) Very poor gas efficiency µs mA

9 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, PHOENIX 28 GHz : high current extraction (Xenon) From : T. Thuillier et al., Institut des Sciences Nucléaires UJF-IN2P3-CNRS, Grenoble, France Xe 17+ beam Xe 18+ beam 3D field map of the solenoid 3D source extraction field and magnetic fringe field of the source 15 emA (I HV ) 12.5 emA (I FC1 ) 10.4 emA (Xe emA) 35 mm Faraday Cup 3D field map of the 90° Bending magnet

10 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, PHOENIX 28 GHz : high current extraction (Lead) From : T. Thuillier et al., Institut des Sciences Nucléaires UJF-IN2P3-CNRS, Grenoble, France 10 emA total current (preliminary) 300 µs pulse Shorter and higher afterglow than with ECR GHz CERN 7 ( 10 ?)

11 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, GHz experiment at grenoble ISN/SSI From : T. Thuillier et al., Institut des Sciences Nucléaires UJF-IN2P3-CNRS, Grenoble, France The new (and stable) 28 GHz /10 KW ISN gyrotron from GYCOM Inc. (Nizhny Novgorod, Russia) 1 – Proof of the high frequency / high density effect 2 – Emittance and efficiency to be measured 3 - Afterglow shorter but always difficult to control (0.3-1 ms) 28 GHz /10 KW PHOENIX 28 GHz 5 µs shutdown of the full power

12 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, SMIS 37.5 GHz with optical coupling for very high intensity pulsed current From : S.V. Golubev, D.A. Mansfeld, S.V. Razin, V.A. Skalyga, A.V. Vodopyanov, V.G. Zorin, Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia, R. Geller, T. Lamy, P. Sortais, T. Thuillier Institut des Sciences Nucléaires UJF-IN2P3-CNRS, Grenoble, France Optical coupling of the UHF power : up to 100 KW / 1 ms each 20 s Very simple magnetic system

13 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, SMIS 37.5 GHz very high current density production From : S.V. Golubev, D.A. Mansfeld, S.V. Razin, V.A. Skalyga, A.V. Vodopyanov, V.G. Zorin, Institute of Applied Physics, Russian Academy of Sciences, Nizhniy Novgorod, Russia, R. Geller, T. Lamy, P. Sortais, T. Thuillier Institut des Sciences Nucléaires UJF-IN2P3-CNRS, Grenoble, France 30 emA / 3 mm total current mAe/cm part. during 100 µs with Multi Charged Ions Rising time 100 µs To be done : beam matching (100 KV duoplasmatron extractor) efficiency measurement with pulsed valve upgrade to 60 or 90 GHz with pulsed or SC coils possible

14 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, – To bunch the gas in short time ~ > 20 µs 2 – To ionize (>1+) with a time smaller than the effusion time n e e/cm GHz ECR discharge + strong axial magnetic field during the discharge ( 2T) 3 – To deliver a beam with a repetition rate compatible with the lifetime of the ions GHz « ECR Duoplasmatron » for gaseous RIB

15 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, GHz « ECR Duoplasmatron » for gaseous RIB Very high density magnetized plasma n e ~ cm – 3.0 T pulsed coils or SC coils GHz / KW 10 –200 µs / = 6-3 mm optical axial coupling optical radial coupling (if gas only) 1-3 mm 100 KV extraction UHF window or « glass » chamber (?) Target Rapid pulsed valve 20 – 100 µs 20 – 200 mA to ions per bunch with high efficiency Very small plasma chamber ~ 20 mm / L ~ 5 cm Arbitrary distance if gas

16 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, PHOENIX 28 GHz : afterglow control with Lead a.u. 10 ms 0 ms UHF pulse Pb 25 +,24 +,23 +,22 + O+O+ O 2+ O 3+ O 4+ C+C+ N+N+ Pb 16 + Pb 14 + pre – glow bunch correlated with presure drop Ionic pumping during some hundreds of µs

17 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, New RFQ LINAC 3 PSB Simplification of the injection system

18 Pascal Sortais – ISN/SSI - Les Arcs, March 17-22, Rapid ionization of RIB : future prospects 1 – ECRIS can supply either efficiency or pulsed currents ECRIS must supply efficiency AND pulsed currents 2 – 28 GHz / 10 KW preliminary tests could be done at ISN 3 – Possible extension to RIB of condensable elements and upgrade of the other metallic ion stable beams (Pb) next step of PHOENIX development 4 – Never start an heavy ion project without a strong preliminary ion source development program !


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