CANADA S NATIONAL LABORATORY FOR PARTICLE AND NUCLEAR PHYSICS

Transcription

1 CANADA S NATIONAL LABORATORY FOR PARTICLE AND NUCLEAR PHYSICS Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada Report on S1149 Al2O3/Nb High Power Target for 18Ne production Pierre Bricault ISAC Forum 8 April 2009 Sandrina Fernandes, Thierry Stora, Etam Noah Messomo, Richard Cathedral, Stefano Marzari and Friedhelm Ames, Marik Dombsky, Peter Kunz, Aurelia Laxdal and Acc. Div. Operation LABORATOIRE NATIONAL CANADIEN POUR LA RECHERCHE EN PHYSIQUE NUCLÉAIRE ET EN PHYSIQUE DES PARTICULES Propriété d un consortium d universités canadiennes, géré en co-entreprise à partir d une contribution administrée par le Conseil national de recherches Canada

2 The next generation ISOL-type facility in Europe

3 TEST cases 100 kw direct targets (Task 3) Targets Actinide target (carbide) SiC, UC 2 +C, ThC 2 +C W-converter, Moderator & Reflector Metal foil target (solid) Ta, Nb Oxide powder or fiber BeO + converter Insulating materials low de/dx Molten metal (Liquid) Vapor condensation Ion-sources, effusion Mono ECR RILIS, Surface FEBIAD Elements He, Li, Be, Hg 4 Targets 4 Ion-sources 1 Front-end Synergy with β-beam Spin off is expected on: - Similar target materials - Elements from the same chemical group

4 25kW sub-unit realistic test at TRIUMF Preparation initiated with TRIUMF

5 Development of oxide composite target Using a similar technique as the one used for high power carbide target developed at TRIUMF one can bound oxide material target onto metal foil to remove the power. Nb/nano-Al 2 O 3 composite target by high temperature reactive brazing. A reduced peak temperature vs standard Al 2 O 3 is found for 25kW incoming beam.

6 Target release properties Release properties have been investigated with the Rabbit irradiation facility and γ spectroscopy after post irradiation heat treatment.

7 EURISOL collaboration Target test at Triumf - Canada Test of the EURISOL target at TRIUMF April 22 to EDMS

8 Baseline configuration TRIUMF high power target container : Container material : Tantalum FEBIAD ion source with cold transfer line.

9 New FEBIAD-XIIb The new FEBIAD has a cold transfer line to prevent the non volatile contaminants to effuse into the plasma chamber. Modified transfer line goes into a cold copper block and than back to the hollow cathode. Modified electrical circuit to allow for cold transfer line.

10 First target Bended Nb sheet Container wall Al2O3 brazed pill ~80x Radiation fins

11 Variant 3 (dilatation) Cold mounting Start heating (with beam) Differential dilatation & contact pressure Gap 0.05mm 70 Al2O3 disks, 1mm thick brazed onto mm Nb foils

12 S1149 Run The experiment has been scheduled for October 2008, but due to problems during the summer the run was cancelled and rescheduled this year. In april we had the opportunity to run FLUKA and Marik temperature estimate arrived at the same beam power (20 µa) Target was conditioned at ISOLDE and tested at the ISAC test stand. From April 22 nd to 31 st.

13 Mass spectrum

14 Efficiency vs Cathode

15 Efficiency vs Magnetic Field

16 Xe 2+ Xe 1+ Ta 1+, TaO 1+ and TaO2 1+ MB1 current (A)

17 Some Neon Yield vs Proton Beam intensity 7.0E E E E E+03 Ne-17 Yield (/s) 4.0E E E+03 Ne-18 Yield (/s) 4.0E E E E E E p+ (ua) 0.0E p+ (ua)

18 For comparison Al2O3/Nb and SiC/C A T1/2 s Al2O3 I/s P µa SiC I/s P µa Al2O3 per µa/gr/cm 2 SiC per µa/gr/cm E E E E E E E E E E E E E E E E E E E E+03

19 Summary Test FEBIAD-XIIb equipped with cold transfer line for the first time, Operating parameters (cathode heating) was different, we had to run the cathode at 334 Amp. instead of 310 Amp. previously. Efficiency measured using calibrated leak was 0.2%. No Fluorine impurities with Ne beams, but we see Na. Target worked fine up to 25 µa. The last day we pushed up to 30µA, the pressure increase inside the containment box. The cooling temperature was also going up. So we cannot say if it was form the target or just warming up the whole system. => Need to improve the target station cooling We would like to run the next Al2O3 with thinner oxide and Nb layers to speed the release.