Measurement of the SEISM
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1 Measurement of the SEISM (Sixty GHz ECR Ion Source using Megawatt Magnets) magnetic field map Mélanie MARIE-JEANNE J. Jacob, T. Lamy, L. Latrasse from LPSC Grenoble F. Debray, J. Matera, R. Pfister, C. Trophime from LNCMI Grenoble
2 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 2/18 Outline Why a 60GHz prototype? Results of the design study Technical challenges of fabrication Magnetic field measurements What next?
3 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 3/18 Why a 60GHz prototype? (1) For the beta-beam project RADIATION RESISTANT HIGH CURRENTS Close to target at/s yields Ion production Short half-lives from 807ms ( 6 He) to 1.67s ( 18 Ne) EFFICIENT IONIZATION SHORT CONFINEMENT TIME 6 He, 18 Ne storage and β - decay Multi-ionizing and bunching radioactive gases diffusing from the target Neutrino beams 10Hz to 25Hz duty cycle μs pulses PULSED MODE SHORT BUNCHES
4 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 4/18 Why a 60GHz prototype? (2) What kind of prototype Origins of 60GHz project: presentation by P. Sortais in Moriond - Les Arcs, March 17-22, 2003 PULSED MODE SHORT CONFINEMENT TIME PREGLOW MODE HIGH CURRENTS SHORT BUNCHES Preglow mode 60GHz ECRIS RADIATION RESISTANT Compact (combined to target) 60GHz high density plasma New ECR magnetic structures using resistive polyhelix coils Experimental Ar4+ preglow pulse from PHOENIX V2 at 28GHz Izotov I.V., Lamy T., Latrasse L., Sidorov A.V., Skalyga V.A. et al IEEE Transactions on Plasma Science 36/4 (2008) Polyhelix technology developed at LNCMI Grenoble
5 B sur l'axe (Gauss) 60 mm Results of the design study (1) SEISM prototype L. Latrasse et al., SEISM: A 60 GHz cusp electron cyclotron resonance ion source, Rev. Sci. Instrum. 81, 02A324, T Injection Extraction Plasma chamber H TT 2.1 T T H1 400 ECR zone Field line T Peak to peak ~100 mm injection extraction Expérience Calcul 50 Compact CUSP magnetic structure Magnetic field above expectations H4 H z (mm) H1 aluminum prototype 2 current leads per coil bossage to avoid rotation H4 H2 H1 H3 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 5/18
6 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 6/18 Results of the design study (1) SEISM prototype 30kA current on each set of coils Fake plasma chamber Stainless steel rod
7 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 7/18 Results of the design study (1) SEISM prototype 28l/s waterflow in each tank Water out Water in Water inlet Water outlets
8 Results of the design study (2) Test bench at LNCMI Grenoble On-site connection to a running magnet for half-magnetic field test 13T 10MW magnet 2x13000A applied Electric parameters I = A P = 0.75 MW (one coil set) Cooling parameters Q = 22 l/s P in = 20 bars Max coil temperature T mean = 50 C T Max. loc. 70 C. Deionized water inlet Valve Flowmeter Flexible power cables Deionized water outlet Flexible pipes Electrically in series Hydraulics in parallel Magnetic measurement systems Flexible power cables Voltage measurement Hall probe Jack Visit LNCMI on Thursday! August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 8/18
9 Technical challenges (1) Insulating between the helices windings Narrow insulators (2mm wide) to minimize local heating Height calibration (0.32mm height) 24 sectors on inner coil, 32 sectors on outer coil to avoid contact between the windings «prepreg» for pre-impregnated composite fibres G11 dry woven glass fabric impregnated with epoxy resin Specified maximum continuous operating temperature: 165 C Specified breakdown voltage condition: 35kV/mm Temperature calculations Out of stock! Tests with frozen out-of-date prepreg 20MPa at room temperature Resin damaged for local temperatures around 300 C Winding displacement calculations Heating tests on prepreg Damaged resin insulators Height calibrating pieces August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 9/18
10 Water flow (l/s) August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 10/18 Technical challenges (2) Hydraulic circulation from the inner to the outer coil Tests with fake aluminum helices water circulation up to 18bars 18l/s in each tank cavitation noises, small damage marks on aluminum Tests with copper helices and measurements up to 7000A 10bar - 12l/s in each tank _ water speed up to 14m/s in the radial helices slit cavitation noises Porous discs to slow down the flow in SEISM, but not in the LNCMI magnet running in parallel no more cavitation, but a filter damaged after 24 hours of run Water flow vs applied current Injection tank Extraction tank Injection tank with porous disks Extraction tank with porous disks P ~ 0.5 bar in the helices 28l/s waterflow in each tank bar on the porous disc Current (A)
11 Delta T Technical challenges (3) Temperature monitoring Voltage measurement to monitor the coils resistance / temperature: Mean temperature evolution injection extraction injection with poral discs extraction with poral discs Voltage measurement Current (A) Inserting a camera to have a look: Snapshot of the outer coil insulators after 40 hours of run up to 7000A ++ insulators still aligned! -- color indicates local temperature is higher than expected insulators August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 11/18
12 Axial field Bz (T) Axial field Bz (T) 60 mm Magnetic field measurements (1) Measurement setup Measurement on 3 horizontal axes along z and on one radial axis 300mm-course jacks with a step-by-step motor equipped with a probe holder Controllers ECR zone 4 T Injection Extraction 6 T 3 T 2.1 T 4 T Field line Peak to peak ~100 mm 30mm 15mm 0mm Hall probe Jack Two gaussmeters equipped with single-axis axial and radial Hall probes Axial field in LNCMI M5 magnet Bell615 Hall probe 1 M5 magnet calibration 0 curve Current intensity (A) Axial field in LNCMI M5 magnet 4 3,5 3 2,5 2 1,5 1 Bell5080 Hall probe 0,5 M5 magnet calibration Current intensity (A) LabView interface to move jacks and acquire data August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 12/18
13 Bz (T) Bz (T) Br x-component (T) Magnetic field measurements (2) Preliminary results vs simulations Radial field measurement on axis 15mm at 3500A 0,3 probe HORIZONTAL at angle 90deg probe VERTICAL at angle 0deg 0,2 As expected: Axisymmetric field Increase with distance to central axis 0,1 Scaling with increase of the intensity ,1 Unexpected: Shift in maxima positions -0,2 z (mm) Lower amplitude on extraction side Axial magnetic field on central axis 3 2,5 2 1,5 1 0, , A 3500A 5250A 7000A 8750A 10500A Axial magnetic field on central axis A 3500A 5250A 7000A 8750A 10500A 14000A (extrapolated) 14000A (calculations) ,5-3 z (mm) z (mm) August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 13/18
14 Bz (T) August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 14/18 Magnetic field measurements (2) Preliminary results vs simulations Axial field on central axis at 7000A 2,5 2 1,5 1 simulation-injection simulation-extraction simulation-injection measurement-injection simulation-extraction simulated sum measurement-extraction measurement-injection measurement-extraction simulated sum sum of measurements 0, ,5-1 -1,5 z (mm)
15 Magnetic field measurements (3) Possible explanations Mechanical error (tank dimensions, helix positioning) Injection and extraction coil sets are too close Sum of the amplitudes is modified Not likely to cause 10mm difference, tanks dimensions were checked and within tolerances Misplaced magnetic center because helix shape is wrong Electric discharge machining with a 0.25mm wire For example real split is 0.37mm instead of expected 0.32mm Magnetic centers can be checked individually for each helix after dismounting Calculation error Considered heat transfer is wrong Copper resistance is higher, current density is lower, and resulting magnetic field is lower Comparative simulations should be performed August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 15/18
16 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 16/18 Conclusion The SEISM magnetic structure was built and set up on a test bench at LNCMI Grenoble Continuous magnetic field has been produced on-site for 70h up to now Results show an axi-symmetric field map with a lower amplitude and closer maxima than expected from the simulations Possible explanations involve mechanical errors in the fabrication of the polyhelix coils or the water tanks, and are still under investigation
17 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 17/18 What next? Right now: Damaged poral disc to be replaced Gaussmeter with triple-axis Hall probe to be bought Magnetic field measurements up to 14000A (2 weeks run to be scheduled in automn 2010) Next year: Plasma chamber design permanent room at LNCMI is under funding request for first tests at 28 GHz In a near future: Preparation to raise the current to full intensity (30kA) Adding direct voltage reading on each individual helix Adding temperature reading on local non-cooled parts (insulators) Insulators replacement? What kind? 60 GHz gyrotron is currently under construction at IAP-NN (ISTC contract)
18 August 28, 2010 Mélanie MARIE-JEANNE ECRIS 10 - Grenoble, France 18/18 Acknowledgements To numerous people from the SERM-LPSC workshop To the LNCMI Magnet Group
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