Mosaic diamond detectors for fast neutrons and large ionizing radiation fields

First neutron and X-ray beam tests on a novel 12-pixel single-crystal diamond mosaic detector are presented and discussed. Preliminary characterization of single-pixel electronic properties, performed with α particles, results in charge carrier mobilities >2000 cm2 Vs−1 and saturation velocities of the order of 107 cm s−1. Signal stability over time, measured with a 241Am source (37 kBq activity), is longer than 5 h. Tests under an intense X-ray beam (1 Gy h−1 dose-rate) show a very good response uniformity (down to about 1% of relative standard deviation from mean value), suggesting a high level of pixel reproducibility at intermediate bias voltages (ranging from 20 to 100 V). Response uniformity reduces at voltages >200 V, due presumably to radiation-assisted detrapping effects. Preliminary results of 12-pixel simultaneous acquisitions of X-ray beam profiles and pulse height spectra under a fast neutron beam (14 MeV) are also presented.

[1]  S. Salvatori,et al.  X-ray diamond detectors with energy resolution , 2007 .

[2]  Giuseppe Gorini,et al.  Pixelated Single-crystal Diamond Detector for fast neutron measurements , 2015 .

[3]  Gennaro Conte,et al.  Polycrystalline CVD diamond pixel array detector for nuclear particles monitoring , 2013 .

[4]  D. Tromson,et al.  Particle and Radiation Detectors Based on Diamond , 2001 .

[5]  Richard B. Jackman,et al.  Diamond photoconductors: operational lifetime and radiation hardness under deep-UV excimer laser irradiation , 2001 .

[6]  P. Calvani,et al.  Resistant and sensitive single-crystal diamond dosimeters for ionizing radiation , 2013 .

[7]  E. Griesmayer,et al.  A new CVD diamond mosaic-detector for (n, α) cross-section measurements at the n_TOF experiment at CERN , 2013, 1312.1649.

[8]  W. Cunningham,et al.  Single crystal CVD diamond as an X-ray beam monitor , 2007 .

[9]  D. Tromson,et al.  CVD diamond for nuclear detection applications , 2002 .

[10]  William Trischuk,et al.  Charge-carrier properties in synthetic single-crystal diamond measured with the transient-current technique , 2005 .

[11]  P. Calvani,et al.  Very Fast and Primingless Single-Crystal-Diamond X-Ray Dosimeters , 2012, IEEE Electron Device Letters.

[12]  P. Calvani,et al.  Radiation-assisted Frenkel-Poole transport in single-crystal diamond , 2013 .

[13]  G Croci,et al.  Single crystal diamond detector measurements of deuterium-deuterium and deuterium-tritium neutrons in Joint European Torus fusion plasmas. , 2014, The Review of scientific instruments.

[14]  A. Plompen,et al.  Experimental response functions of a single-crystal diamond detector for 5–20.5 MeV neutrons , 2011 .

[15]  M. Sullivan,et al.  Transmission-mode diamond white-beam position monitor at NSLS. , 2012, Journal of synchrotron radiation.

[16]  M. Tardocchi,et al.  Response of a single-crystal diamond detector to fast neutrons , 2013 .

[17]  Eugenijus Gaubas,et al.  Simulations of Operation Dynamics of Different Type GaN Particle Sensors , 2015, Sensors.

[18]  Mario Pillon,et al.  The 14 MeV Frascati neutron generator , 1994 .

[19]  T. Ceponis,et al.  Pulsed current signals in capacitor type particle detectors , 2015 .

[20]  P. Bergonzo,et al.  Solar blind chemically vapor deposited diamond detectors for vacuum ultraviolet pulsed light-source characterization , 1998 .

[21]  G Croci,et al.  A diamond based neutron spectrometer for diagnostics of deuterium-tritium fusion plasmas. , 2014, The Review of scientific instruments.

[22]  C. Jacoboni,et al.  A review of some charge transport properties of silicon , 1977 .

[23]  K. Hecht.  Zum Mechanismus des lichtelektrischen Primärstromes in isolierenden Kristallen , 1932 .

[24]  G. Conte,et al.  Diamond Detectors for UV and X-Ray Source Imaging , 2012, IEEE Electron Device Letters.