liu.seSearch for publications in DiVA
Change search
Link to record
Permanent link

Direct link
BETA
Höglund, Carina
Publications (10 of 35) Show all publications
Pfeiffer, D., Resnati, F., Birch, J., Etxegarai, M., Hall-Wilton, R., Höglund, C., . . . Thuiner, P. (2016). First measurements with new high-resolution gadolinium-GEM neutron detectors. Journal of Instrumentation, 11(P05011)
Open this publication in new window or tab >>First measurements with new high-resolution gadolinium-GEM neutron detectors
Show others...
2016 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 11, no P05011Article in journal (Refereed) Published
Abstract [en]

European Spallation Source instruments like the macromolecular diffractometer (NMX) require an excellent neutron detection efficiency, high-rate capabilities, time resolution, and an unprecedented spatial resolution in the order of a few hundred micrometers over a wide angular range of the incoming neutrons. For these instruments solid converters in combination with Micro Pattern Gaseous Detectors (MPGDs) are a promising option. A GEM detector with gadolinium converter was tested on a cold neutron beam at the IFE research reactor in Norway. The mu TPC analysis, proven to improve the spatial resolution in the case of B-10 converters, is extended to gadolinium based detectors. For the first time, a Gd-GEM was successfully operated to detect neutrons with a measured efficiency of 11.8% at a wavelength of 2 angstrom and a position resolution better than 250 mu m.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2016
Keywords
Neutron detectors (cold, thermal, fast neutrons); Neutron diffraction detectors; Particle tracking detectors
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:liu:diva-130142 (URN)10.1088/1748-0221/11/05/P05011 (DOI)000377851700034 ()
Note

Funding Agencies|EU Horizon 2020 framework, BrightnESS project [676548]

Available from: 2016-07-12 Created: 2016-07-11 Last updated: 2017-11-28
Muraro, A., Albani, G., Perelli Cippo, E., Croci, G., Angella, G., Birch, J., . . . Tardocchi, M. (2016). Neutron radiography as a non-destructive method for diagnosing neutron converters for advanced thermal neutron detectors. Paper presented at International Workshop on Imaging. Journal of Instrumentation, 11(C03033)
Open this publication in new window or tab >>Neutron radiography as a non-destructive method for diagnosing neutron converters for advanced thermal neutron detectors
Show others...
2016 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 11, no C03033Article in journal (Refereed) Published
Abstract [en]

Due to the well-known problem of He-3 shortage, a series of different thermal neutron detectors alternative to helium tubes are being developed, with the goal to find valid candidates for detection systems for the future spallation neutron sources such as the European Spallation Source (ESS). A possible He-3-free detector candidate is a charged particle detector equipped with a three dimensional neutron converter cathode (3D-C). The 3D-C currently under development is composed by a series of alumina (Al2O3) lamellas coated by 1 mu m of B-10 enriched boron carbide (B4C). In order to obtain a good characterization in terms of detector efficiency and uniformity it is crucial to know the thickness, the uniformity and the atomic composition of the B4C neutron converter coating. In this work a non-destructive technique for the characterization of the lamellas that will compose the 3D-C was performed using neutron radiography. The results of these measurements show that the lamellas that will be used have coating uniformity suitable for detector applications. This technique (compared with SEM, EDX, ERDA, XPS) has the advantage of being global (i.e. non point-like) and non-destructive, thus it is suitable as a check method for mass production of the 3D-C elements.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016
Keywords
Inspection with neutrons; Neutron radiography; Image filtering; Data processing methods
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-128972 (URN)10.1088/1748-0221/11/03/C03033 (DOI)000375746200034 ()
Conference
International Workshop on Imaging
Available from: 2016-06-09 Created: 2016-06-07 Last updated: 2017-08-28
Piscitelli, F., Khaplanov, A., Devishvili, A., Schmidt, S., Höglund, C., Birch, J., . . . Van Esch, P. (2016). Neutron reflectometry on highly absorbing films and its application to (B4C)-B-10-based neutron detectors. Proceedings of the Royal Society. Mathematical, Physical and Engineering Sciences, 472(2185), 20150711
Open this publication in new window or tab >>Neutron reflectometry on highly absorbing films and its application to (B4C)-B-10-based neutron detectors
Show others...
2016 (English)In: Proceedings of the Royal Society. Mathematical, Physical and Engineering Sciences, ISSN 1364-5021, E-ISSN 1471-2946, Vol. 472, no 2185, p. 20150711-Article in journal (Refereed) Published
Abstract [en]

Neutron reflectometry is a powerful tool used for studies of surfaces and interfaces. The absorption in the typical studied materials is neglected and this technique is limited only to the reflectivity measurement. For strongly absorbing nuclei, the absorption can be directly measured by using the neutron-induced fluorescence technique which exploits the prompt particle emission of absorbing isotopes. This technique is emerging from soft matter and biology where highly absorbing nuclei, in very small quantities, are used as a label for buried layers. Nowadays, the importance of absorbing layers is rapidly increasing, partially because of their application in neutron detection; a field that has become more active also due to the He-3-shortage. We extend the neutron-induced fluorescence technique to the study of layers of highly absorbing materials, in particular (B4C)-B-10. The theory of neutron reflectometry is a commonly studied topic; however, when a strong absorption is present the subtle relationship between the reflection and the absorption of neutrons is not widely known. The theory for a general stack of absorbing layers has been developed and compared to measurements. We also report on the requirements that a (B4C)-B-10 layer must fulfil in order to be employed as a converter in neutron detection.

Place, publisher, year, edition, pages
ROYAL SOC, 2016
Keywords
neutron-induced fluorescence; neutron reflectometry; boron-10; neutron detection
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-125159 (URN)10.1098/rspa.2015.0711 (DOI)000368479000021 ()
Note

Funding Agencies|BrightnESS project [INFRADEV-3-2015, 676548]; CRISP project (European Commission) [283745]; Swedish Research Council VR [2009-6232]; Carl Tryggers Foundation for Scientific Research; Knut and Alice Wallenberg Foundation

Available from: 2016-02-15 Created: 2016-02-15 Last updated: 2017-11-30
Imam, M., Gaul, K., Stegmueller, A., Höglund, C., Jensen, J., Hultman, L., . . . Pedersen, H. (2015). Gas phase chemical vapor deposition chemistry of triethylboron probed by boron-carbon thin film deposition and quantum chemical calculations. Journal of Materials Chemistry C, 3(41), 10898-10906
Open this publication in new window or tab >>Gas phase chemical vapor deposition chemistry of triethylboron probed by boron-carbon thin film deposition and quantum chemical calculations
Show others...
2015 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 3, no 41, p. 10898-10906Article in journal (Refereed) Published
Abstract [en]

We present triethylboron (TEB) as a single-source precursor for chemical vapor deposition (CVD) of BxC thin films and study its gas phase chemistry under CVD conditions by quantum chemical calculations. A comprehensive thermochemical catalogue for the species of the gas phase chemistry of TEB is examined and found to be dominated by beta-hydride eliminations of C2H4 to yield BH3. A complementary bimolecular reaction path based on H-2 assisted C2H6 elimination to BH3 is also significant at lower temperatures in the presence of hydrogen. Furthermore, we find a temperature window of 600-1000 degrees C for the deposition of X-ray amorphous BxC films with 2.5 less than= x less than= 4.5 from TEB. Films grown at temperatures below 600 degrees C contain high amounts of H, while temperatures above 1000 degrees C result in C-rich films. The film density and hardness are determined to be in the range of 2.40-2.65 g cm(-3) and 29-39 GPa, respectively, within the determined temperature window.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2015
National Category
Physical Sciences Chemical Sciences
Identifiers
urn:nbn:se:liu:diva-122673 (URN)10.1039/c5tc02293b (DOI)000363252200030 ()
Note

Funding Agencies|European Spallation Source ESS AB; Knut and Alice Wallenberg Foundation; German Science Foundation (Research Training Group 1782); Beilstein Foundation (Frankfurt/Germany)

Available from: 2015-11-16 Created: 2015-11-13 Last updated: 2017-09-29
Höglund, C., Alling, B., Jensen, J., Hultman, L., Birch, J. & Hall-Wilton, R. (2015). Growth and oxidization stability of cubic Zr1-xGdxN solid solution thin films. Journal of Applied Physics, 117(19), 195301
Open this publication in new window or tab >>Growth and oxidization stability of cubic Zr1-xGdxN solid solution thin films
Show others...
2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 19, p. 195301-Article in journal (Refereed) Published
Abstract [en]

We report Zr1-xGdxN thin films deposited by magnetron sputter deposition. We show a solid solubility of the highly neutron absorbing GdN into ZrN along the whole compositional range, which is in excellent agreement with our recent predictions by first-principles calculations. An oxidization study in air shows that Zr1-xGdxN with x reaching from 1 to close to 0 fully oxidizes, but that the oxidization is slowed down by an increased amount of ZrN or stopped by applying a capping layer of ZrN. The crystalline quality of Zr0.5Gd0.5N films increases with substrate temperatures increasing from 100 degrees C to 900 degrees C.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-119249 (URN)10.1063/1.4921167 (DOI)000355005600031 ()
Note

Funding Agencies|Swedish Research Council (VR) [621-2011-4417, 330-2014-6336]

Available from: 2015-06-12 Created: 2015-06-12 Last updated: 2017-12-04
Birch, J., Buffet, J.-C. -., Clergeau, J.-F. -., van Esch, P., Ferraton, M., Guerard, B., . . . Piscitelli, F. (2015). Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium. Journal of Instrumentation, 10, 1-14
Open this publication in new window or tab >>Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium
Show others...
2015 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, p. 1-14Article in journal (Refereed) Published
Abstract [en]

Thermal neutron detector based on films of (B4C)-B-10 have been developed as an alternative to He-3 detectors. In particular, The Multi-Grid detector concept is considered for future large area detectors for ESS and ILL instruments. An excellent signal-to-background ratio is essential to attain expected scientific results. Aluminium is the most natural material for the mechanical structure of of the Multi-Grid detector and other similar concepts due to its mechanical and neutronic properties. Due to natural concentration of alpha emitters, however, the background from alpha particles misidentified as neutrons can be unacceptably high. We present our experience operating a detector prototype affected by this issue. Monte Carlo simulations have been used to confirm the background as alpha particles. The issues have been addressed in the more recent implementations of the Multi-Grid detector by the use of purified aluminium as well as Ni-plating of standard aluminium. The result is the reduction in background by two orders of magnitude. A new large-area prototype has been built incorporating these modifications.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2015
Keywords
Instrumentation for neutron sources; Gaseous detectors; Materials for gaseous detectors; Neutron detectors (cold, thermal, fast neutrons)
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:liu:diva-124525 (URN)10.1088/1748-0221/10/10/P10019 (DOI)000367674700021 ()
Note

Funding Agencies|CRISP project (European Commission 7th Framework Programme Grant) [283745]

Available from: 2016-02-02 Created: 2016-02-01 Last updated: 2017-11-30
Höglund, C., Zeitelhack, K., Kudejova, P., Jensen, J., Greczynski, G., Lu, J., . . . Hall-Wilton, R. (2015). Stability of (B4C)-B-10 thin films under neutron radiation. Radiation Physics and Chemistry, 113, 14-19
Open this publication in new window or tab >>Stability of (B4C)-B-10 thin films under neutron radiation
Show others...
2015 (English)In: Radiation Physics and Chemistry, ISSN 0969-806X, E-ISSN 1879-0895, Vol. 113, p. 14-19Article in journal (Refereed) Published
Abstract [en]

Thin films of (B4C)-B-10 have shown to be very suitable as neutron-converting material in the next generation of neutron detectors, replacing the previous predominantly used He-3. In this contribution we show under realistic conditions that (B4C)-B-10 films are not damaged by the neutron irradiation and interactions, which they will be exposed to under many years in a neutron detector. 1 mu m thick (B4C)-B-10 thin films were deposited onto Al or Si substrates using dc magnetron sputtering. As-deposited films were exposed to a cold neutron beam with fluences of up to 1.1 x 10(14) cm(-2) and a mean wavelength of 6.9 angstrom. Both irradiated and as-deposited reference samples were characterized with time-of-flight elastic recoil detection analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoemission spectroscopy, and X-ray diffraction. We show that only 1.8 ppm of the B-10 atoms were consumed and that the film composition does not change by the neutron interaction within the measurement accuracy. The irradiation does not deteriorate the film adhesion and there is no indication that it results in increased residual stress values of the as-deposited films of 0.095 GPa. From what is visible with the naked eye and down to atomic level studies, no change from the irradiation could be found using the above-mentioned characterization techniques.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Neutron; Radiation damage; Thin film; (B4C)-B-10; Neutron detection
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:liu:diva-120133 (URN)10.1016/j.radphyschem.2015.04.006 (DOI)000356196600003 ()
Note

Funding Agencies|Knut and Alice Wallenberg Foundation; Isotope Project; Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials (AFM) at Linkoping University (SFO-Mat-LiU) [2009-2500971]; Linkoping University

Available from: 2015-07-14 Created: 2015-07-13 Last updated: 2017-12-04
Pfeiffer, D., Resnati, F., Birch, J., Hall-Wilton, R., Höglund, C., Hultman, L., . . . Thuiner, P. (2015). The mu TPC method: improving the position resolution of neutron detectors based on MPGDs. Journal of Instrumentation, 10(P04004)
Open this publication in new window or tab >>The mu TPC method: improving the position resolution of neutron detectors based on MPGDs
Show others...
2015 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, no P04004Article in journal (Refereed) Published
Abstract [en]

Due to the He-3 crisis, alternatives to the standard neutron detection techniques are becoming urgent. In addition, the instruments of the European Spallation Source (ESS) require advances in the state of the art of neutron detection. The instruments need detectors with excellent neutron detection efficiency, high rate capabilities and unprecedented spatial resolution. The Macromolecular Crystallography instrument (NMX) requires a position resolution in the order of 200 mu m over a wide angular range of incoming neutrons. Solid converters in combination with Micro Pattern Gaseous Detectors (MPGDs) are proposed to meet the new requirements. Charged particles rising from the neutron capture have usually ranges larger than several millimetres in gas. This is apparently in contrast with the requirements for the position resolution. In this paper, we present an analysis technique, new in the field of neutron detection, based on the Time Projection Chamber (TPC) concept. Using a standard Single-GEM with the cathode coated with (B4C)-B-10, we extract the neutron interaction point with a resolution of better than sigma = 200 mu m.

Place, publisher, year, edition, pages
IOP Publishing: Hybrid Open Access, 2015
Keywords
Particle tracking detectors; Time projection Chambers (TPC); Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc); Neutron detectors (cold, thermal, fast neutrons)
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:liu:diva-120472 (URN)10.1088/1748-0221/10/04/P04004 (DOI)000357961700049 ()
Available from: 2015-08-12 Created: 2015-08-11 Last updated: 2017-12-04
Imam, M., Höglund, C., Jensen, J., Schmidt, S., Ivanov, I. G., Hall-Wilton, R., . . . Pedersen, H. (2015). Trimethylboron as single-source precursor for boron-carbonthin film synthesis by plasma chemical vapor deposition.
Open this publication in new window or tab >>Trimethylboron as single-source precursor for boron-carbonthin film synthesis by plasma chemical vapor deposition
Show others...
2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Boron-carbon (BxC) thin films are potential neutron converting layers for 10B-based neutron detectors. However, as common material choices for such detectors do not tolerate temperature above 500°C, a low temperature deposition route is required for this application. Here we study trimethylboron B(CH3)3 (TMB) as a single-source precursor for the deposition of BxC thin films by plasma CVD using Ar plasma. The effect of plasma power, TMB/Ar ratio and total pressure on the film composition, morphology and structure are investigated. The highest B/C ratio of 1.9 was achieved at high TMB flow in a low total pressure and high plasma power which rendered an approximate substrate temperature of ~ 300 °C. X-ray photoelectron spectroscopy shows that B-C bonds prevail in the films, although C-C and B-O bonds are also present. Raman spectroscopy confirms the presence of amorphous carbon phases in the films. The H content in the films is found to be 15±5 at. % by the time of flight elastic recoil detection analysis (Tof-ERDA). The film density as determined from X-ray reflectivity (XRR) measurements is 2. 16 ± 0.01  g/cm3 and the internal compressive stresses are measured to be less than 400 MPa.

National Category
Physical Sciences Chemical Sciences
Identifiers
urn:nbn:se:liu:diva-123908 (URN)
Available from: 2016-01-13 Created: 2016-01-13 Last updated: 2016-01-13Bibliographically approved
Birch, J., Buffet, J.-C., Clergeau, J.-F., Correa, J., van Esch, P., Ferraton, M., . . . Zbiri, M. (2014). In-beam test of the Boron-10 Multi-Grid neutron detector at the IN6 time-of-flight spectrometer at the ILL. In: INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOPandD 2013): . Paper presented at International Workshop on Neutron Optics and Detectors (NOPandD). IOP Publishing: Conference Series / Institute of Physics (IoP), 528(012040)
Open this publication in new window or tab >>In-beam test of the Boron-10 Multi-Grid neutron detector at the IN6 time-of-flight spectrometer at the ILL
Show others...
2014 (English)In: INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOPandD 2013), IOP Publishing: Conference Series / Institute of Physics (IoP) , 2014, Vol. 528, no 012040Conference paper, Published paper (Refereed)
Abstract [en]

A neutron detector concept based on solid layers of boron carbide enriched in 1 B has been in development for the last few years as an alternative for He-3 by collaboration between the ILL, ESS and Linkoping University. This Multi-Grid detector uses layers of aluminum substrates coated with (B4C)-B-10 on both sides that are traversed by the incoming neutrons. Detection is achieved using a gas counter readout principle. By segmenting the substrate and using multiple anode wires, the detector is made inherently position sensitive. This development is aimed primarily at neutron scattering instruments with large detector areas, such as time-of-flight chopper spectrometers. The most recent prototype has been built to be interchangeable with the He-3 detectors of IN6 at ILL. The 1 B detector has an active area of 32 x 48 cm(2). It was installed at the IN6 instrument and operated for several weeks, collecting data in parallel with the regularly scheduled experiments, thus providing the first side-by-side comparison with the conventional He-3 detectors. Results include an efficiency comparison, assessment of the in-detector scattering contribution, sensitivity to gamma-rays and the signal-to-noise ratio in time-of-flight spectra. The good expected performance has been confirmed with the exception of an unexpected background count rate. This has been identified as natural alpha activity in aluminum. New convertor substrates are under study to eliminate this source of background.

Place, publisher, year, edition, pages
IOP Publishing: Conference Series / Institute of Physics (IoP), 2014
Series
Journal of Physics Conference Series, ISSN 1742-6588 ; 528
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-110299 (URN)10.1088/1742-6596/528/1/012040 (DOI)000340245000040 ()
Conference
International Workshop on Neutron Optics and Detectors (NOPandD)
Available from: 2014-09-05 Created: 2014-09-05 Last updated: 2016-08-31
Organisations

Search in DiVA

Show all publications