JM f m Princeton Plusmu Physics Luborazov, Princeton NJ 08540, USA.

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1 ... A THZN-FOIL 'FARADAY COL,ECTOR AS A RADIATLON-HARD, HIGH FLUENCE CHARGED PARTICLE SPECTROMETER JM f m97 F.E. Cecil', J. C. Bxbour, P. v.belle, M. Hone, O.N. Jamb,S Kern', M. LougNh, S. S. Medley', A. Nowak', A.L. Roquemore,G. Sadler, Y. Takimoto', G. Whitfield', I Colorado School of Mines, Golden CO 8, USA; 'Sandia National Luborutory, Albuquerque MM, 878% USA; JETJoint Underrukirrg,Abingdon OX E, (JK; d Princeton Plusmu Physics Luborazov, Princeton NJ 8, USA. We have developed a radiation-hard, charged particle spectrometer, consisting of thin parallel conducting foils as current collectors. Prototype detectors have been tested in accelerator bombardments and at the fbsion plasma facilities TFTR and JET. In the case of the accelerator bombardments, a detector consisting of AI foils, each of thickness about pm, demonstrated an energy resolution of about 7% for 7 MeV alpha particles. The prototype tested immediately outside TFTR demonstrated the expected insensitivity to moderately high levels of fast neutrons and hard garnm rays. The prototype tested inside JET similarly indicated operational capability at elevated temperatures as a lost alpha particle detector for d-t tokamak fusion plasmas. Conventional charged particle detectors, such as surface barrier Sllicon detectors or thin scintillation detectors suffer from the inability t o operate effectively at high temperatures and high background radiation fields An alternative detector concept not suffering fiom these limitations is that of a stack of parallel thin metallic foils, electrically insulated fiom one another and connected to separate ammeters. The ability of such a stack of foils to operate as a spectrometer derives from the fact that the range of the charged particles is an increasing hnction of energy and consequently the energy of the particle can be inferred from the deepest foil in the stack which registers current. The nlinimum fluence will be limited by the sensitivity of the ammeters chosen to regjster the currents. A complica~ionarises from the fact that as the energetic particles pass through or stop in a given foil, secondary electrons will be emitted The suppression of these secondary electrons is essential il the optimal spectrometric capability of the detector is to be realized The expected insensitivity background neutron and gamma radiation has been described in some our earlier works devoted to this concept.[ and references therein] Specifically for d-t tokamak experiments such as E T or 'ER, the proposed detectors should be able to ineasure the first walf flux of lost alpha particles at the pa/crn levels in the presence of intense fast neutron and hard gamma ray backgrounds with an expected signal to noise ratio of at Least two orders of magnitude. This has been successfully tested to date with the placement of a prototype deiector immediately outside TFTR dunng d-t plasmas with total neutron source strengths exceeding Lgn/s.[ I ] 'The ability to operate inside a tokamak during d-d plasma operation has likewise been demonstrated o n let[ J bl

2 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof,

3 Portions of this document may be inegible in electronic image produck Images are produced from the bgst available original dor?mneill

4 The response in general and the energy resolution in particular of such a detcctor can best be evaluated by exp'osing the detector to a well collimated, monoenergelk ion b a r n from an accelerator. We have recently carried out a series of such measurements for several detector designs. The bombardments were carried out at the Tadem Van-de-Graf facility at Sandia National Laboratory with He* and He" ion beams with energies from to 7. MeV. The detectors, differing in their foil materials and in the mamers in which the adjacent foils are electrically insulated fiom one another, are described in the following Table. The frst detectorin this table is identical to the detectors presently installed in the JET tokamak as first wall detectors of Iost alpha particles. Except for the Mpolyethylenc detector, all are capable of operating at temperatures up to about " K. Detector desim x. pm Ni foiis x pm AI foils x. pm Ni foils. prn N i + x pm Ni Table. Description of detector designs investigated Insulation n.m thick ceramic rings p polyethylene sheet. pm Alumina deposition. pm mica sheets Comment no actiye insulation beween foils low temperatures (~" K) fabncation by departion facility easily assembled In the case of each detector we observed that currents were only rneasured from foils at depths fiom the front face of the detector less than or equal to the range of the particles in the foil material.[] Thus, for example, x current was measured it the third foil of the first detector in Table for alpha particles with energies less than about MeV. The response from each of the six foils in the AJ foiypolyethylene insulator sandwich detector are shown in Figure below. The spectrometric capabilities of this detector are obvious from this figure. We are clearly able to distingaish between, for example.,., 7. and 7. MeV e" with this detector indicating an energy resolution better than about 7OA. The current in the first foil arises, we believe, fiom secondary electrons being ejected from the front face of the first foil. This belief is supported by our measurements with He' beams in which the net current fraction in the first foil is about zero as the p s i m e electric current due to the ejection of secondary electrons is canceled by the negufiw eleclric current from the single atomic valence electron on the He' ion which is immediately stripped off of the ion as it enters the first foil. The active insulating layers between the foils in the last three detmors given in Table appear to suppress the secondary electrons produced by the passage of the energetic ions through the foils. Specifically, for the first detector given in the table, with no active insulators between the foils, significant negufiw currents were measured in the third foil during the bombardment of the detector with MeV He" ions. indicating that electrons from the secord foil struck the rhird foil where the ions stopped, prodilcing a net negative current. This negative current was, however, suppressed, leaving the positive current i i o m the stopping alpha particles in the third foil when the detector was placed in a. T magnetic field parallel to the planes of the foils indicating that the secondar). electrons were prevented from leaving the foils. l'his suppression of the seconadry electrons from the secund foil will thus allow these detectors to serve as iost alpha particle detectors in large tukamjks such as J E i ' or ITER since the strength of the toroidal fields in these machines is several.l'esla, signlficantly greater than thc. T used in the prescnt experiment.

5 8.8 -I I. I ~ f! g Foilnumber Foll number >+ E.E e.8..?j. Foll number Figure. Fraction of total current in each foil of MPolyethylene sandwich d e t m o r during bombardment with He" beams of energy. MeV (top), 7. MeV (middle) and 7. MeV (bottom). 'I'hc robustness and moderateiy good energy resolution of these detectors should permit the application to tasks such as the first wall measurement of lost alpha particles from tokamak fusion plasmas, the real time measurement of light ion fission fragments from fission reactor experiments and the in-beam measureinen t of accelerator beam energies as a control diagnostic. We are continuing the development and testing of these detectors in an effort to optimize energy resolution, sustainable heat load, economy and the suppression of the secondary elecirons. This work is supported by the U.S. Department of Energy Office of Magnetic Fusion Science under contract #DE-FG9ER. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Departmen\ oi' Energy under contract DEAC-9AL8. References. M. Luoghlin, F.E. Cecil, M Hone, O.N. Jan%, S. hkdley, A L RoqueInore, G.J. Sadler, P.vm Belle and G. Whitfield. Rev. Sci. Instr. 8, (997). The ranges were calculated with the code SRIM, J.F. Ziegler- arid J. Biersack (99)

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