RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

Oct 2012

Volume 83, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Rev. Sci. Instrum. 83, 101301 (2012); http://dx.doi.org/10.1063/1.4750234 (26 pages)

N. L. Kugland, D. D. Ryutov, C. Plechaty, J. S. Ross, and H.-S. Park

Proton imaging is widely used to reveal electric and magnetic field structures in high energy density plasmas. Even for smooth parent structures, strongly deflected protons can form images with strange shapes or singular lines of very high intensity (i.e. caustics).

Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds
back to top Fusion Products and Fast Ions II—James P. Knauer, Session Chairman

Charged-particle spectroscopy for diagnosing shock ρR and strength in NIF implosions

A. B. Zylstra, J. A. Frenje, F. H. Séguin, M. J. Rosenberg, H. G. Rinderknecht, M. Gatu Johnson, D. T. Casey, N. Sinenian, M. J.-E. Manuel, C. J. Waugh, H. W. Sio, C. K. Li, R. D. Petrasso, S. Friedrich, K. Knittel, et al.

Rev. Sci. Instrum. 83, 10D901 (2012); http://dx.doi.org/10.1063/1.4729672 (3 pages) | Cited 4 times

Online Publication Date: 19 June 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The compact Wedge Range Filter (WRF) proton spectrometer was developed for OMEGA and transferred to the National Ignition Facility (NIF) as a National Ignition Campaign diagnostic. The WRF measures the spectrum of protons from D-3He reactions in tuning-campaign implosions containing D and 3He gas; in this work we report on the first proton spectroscopy measurement on the NIF using WRFs. The energy downshift of the 14.7-MeV proton is directly related to the total ρR through the plasma stopping power. Additionally, the shock proton yield is measured, which is a metric of the final merged shock strength.
Show PACS
07.81.+a Electron and ion spectrometers

A novel particle time of flight diagnostic for measurements of shock- and compression-bang times in D3He and DT implosions at the NIF

H. G. Rinderknecht, M. Gatu Johnson, A. B. Zylstra, N. Sinenian, M. J. Rosenberg, J. A. Frenje, C. J. Waugh, C. K. Li, F. H. Sèguin, R. D. Petrasso, J. R. Rygg, J. R. Kimbrough, A. MacPhee, G. W. Collins, D. Hicks, et al.

Rev. Sci. Instrum. 83, 10D902 (2012); http://dx.doi.org/10.1063/1.4731000 (3 pages) | Cited 2 times

Online Publication Date: 2 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The particle-time-of-flight (pTOF) diagnostic, fielded alongside a wedge range-filter (WRF) proton spectrometer, will provide an absolute timing for the shock-burn weighted ρR measurements that will validate the modeling of implosion dynamics at the National Ignition Facility (NIF). In the first phase of the project, pTOF has recorded accurate bang times in cryogenic DT, DT exploding pusher, and D3He implosions using DD or DT neutrons with an accuracy better than ±70 ps. In the second phase of the project, a deflecting magnet will be incorporated into the pTOF design for simultaneous measurements of shock- and compression-bang times in D3He-filled surrogate implosions using D3He protons and DD-neutrons, respectively.
Show PACS
52.70.-m Plasma diagnostic techniques and instrumentation
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment
52.55.Fa Tokamaks, spherical tokamaks

Calibration techniques for fast-ion Dα diagnostics

W. W. Heidbrink, A. Bortolon, C. M. Muscatello, E. Ruskov, B. A. Grierson, and M. Podestá

Rev. Sci. Instrum. 83, 10D903 (2012); http://dx.doi.org/10.1063/1.4732060 (3 pages)

Online Publication Date: 3 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Fast-ion Dα measurements are an application of visible charge-exchange recombination (CER) spectroscopy that provide information about the energetic ion population. Like other CER diagnostics, the standard intensity calibration is obtained with an integrating sphere during a vacuum vessel opening. An alternative approach is to create plasmas where the fast-ion population is known, then calculate the expected signals with a synthetic diagnostic code. The two methods sometimes agree well but are discrepant in other cases. Different background subtraction techniques and simultaneous measurements of visible bremsstrahlung and of beam emission provide useful checks on the calibrations and calculations.
Show PACS
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.65.-y Plasma simulation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
06.20.fb Standards and calibration

Solid debris collection for radiochemical diagnostics at the National Ignition Facility

J. M. Gostic, D. A. Shaughnessy, K. T. Moore, I. D. Hutcheon, P. M. Grant, and K. J. Moody

Rev. Sci. Instrum. 83, 10D904 (2012); http://dx.doi.org/10.1063/1.4732856 (3 pages)

Online Publication Date: 5 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Radiochemical analysis of post-ignition debris inside the National Ignition Facility (NIF) target chamber can help determine various diagnostic parameters associated with the implosion efficiency of the fusion capsule. This technique is limited by the ability to distinguish ablator material from other debris and by the collection efficiency of the capsule debris after implosion. Prior to designing an on-line collection system, the chemical nature and distribution of the debris inside the chamber must be determined. The focus of our current work has been on evaluating capture of activated Au hohlraum debris on passive foils (5 cm diameter, 50 cm from target center) post-shot. Preliminary data suggest that debris distribution is locally heterogeneous along the equatorial and polar line-of-sights.
Show PACS
52.57.Kk Fast ignition of compressed fusion fuels
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
28.52.Cx Fueling, heating and ignition
28.52.Fa Materials

Multi-shot analysis of the gamma reaction history diagnostic

D. B. Sayre, L. A. Bernstein, J. A. Church, H. W. Herrmann, and W. Stoeffl

Rev. Sci. Instrum. 83, 10D905 (2012); http://dx.doi.org/10.1063/1.4729492 (3 pages)

Online Publication Date: 6 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The gamma reaction history diagnostic at the National Ignition Facility has the capability to determine a number of important performance metrics for cryogenic deuterium-tritium implosions: the fusion burn width, bang time and yield, as well as the areal density of the compressed ablator. Extracting those values from the measured γ rays of an implosion, requires accounting for a γ-ray background in addition to the impulse response function of the instrument. To address these complications, we have constructed a model of the γ-ray signal, and are developing a simultaneous multi-shot fitting routine to constrain its parameter space.
Show PACS
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
29.40.Ka Cherenkov detectors
27.10.+h A ≤ 5
25.45.-z 2H-induced reactions
28.52.Lf Components and instrumentation
25.10.+s Nuclear reactions involving few-nucleon systems

Characterization of single crystal chemical vapor deposition diamond detectors for neutron spectrometry

F. Gagnon-Moisan, A. Zimbal, R. Nolte, M. Reginatto, and H. Schuhmacher

Rev. Sci. Instrum. 83, 10D906 (2012); http://dx.doi.org/10.1063/1.4733300 (3 pages)

Online Publication Date: 10 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Detectors made from artificial chemical vapor deposition single crystal diamond have shown great potential for fast neutron spectrometry. In this paper, we present the results of measurements made at the Physikalisch-Technische Bundesanstalt accelerator using neutron fields in the energy range from 7 MeV to 16 MeV. This study presents the first results of the characterization of the detector in this energy range.
Show PACS
29.30.Hs Neutron spectroscopy
29.40.-n Radiation detectors

Fully digital data acquisition system for the neutron time-of-flight spectrometer TOFOR at JET

M. Skiba, M. Weiszflog, A. Hjalmarsson, G. Ericsson, C. Hellesen, S. Conroy, E. Andersson-Sundén, J. Eriksson, F. Binda, and JET-EFDA Contributors

Rev. Sci. Instrum. 83, 10D907 (2012); http://dx.doi.org/10.1063/1.4734493 (3 pages)

Online Publication Date: 17 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A prototype of a fully digital data acquisition system based on 1 Gsps 12 bit digitizers for the TOFOR fusion neutron spectrometer at JET is assessed. The prototype system enables the use of geometry-based background discrimination techniques, which are modeled, evaluated, and compared to experimental data. The experimental results are in line with the models and show a significant improvement in signal-to-background ratio in measured time-of-flight spectrum compared to the existing data acquisition system.
Show PACS
29.30.-h Spectrometers and spectroscopic techniques
52.55.Fa Tokamaks, spherical tokamaks

Advances in compact proton spectrometers for inertial-confinement fusion and plasma nuclear science

F. H. Seguin, N. Sinenian, M. Rosenberg, A. Zylstra, M. J.-E. Manuel, H. Sio, C. Waugh, H. G. Rinderknecht, M. Gatu Johnson, J. Frenje, C. K. Li, R. Petrasso, T. C. Sangster, and S. Roberts

Rev. Sci. Instrum. 83, 10D908 (2012); http://dx.doi.org/10.1063/1.4732065 (3 pages) | Cited 2 times

Online Publication Date: 24 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Compact wedge-range-filter proton spectrometers cover proton energies ∼3–20 MeV. They have been used at the OMEGA laser facility for more than a decade for measuring spectra of primary D3He protons in D3He implosions, secondary D3He protons in DD implosions, and ablator protons in DT implosions; they are now being used also at the National Ignition Facility. The spectra are used to determine proton yields, shell areal density at shock-bang time and compression-bang time, fuel areal density, and implosion symmetry. There have been changes in fabrication and in analysis algorithms, resulting in a wider energy range, better accuracy and precision, and better robustness for survivability with indirect-drive inertial-confinement-fusion experiments.
Show PACS
52.58.-c Other confinement methods
52.65.-y Plasma simulation
52.70.-m Plasma diagnostic techniques and instrumentation
52.57.-z Laser inertial confinement

The photonuclear neutron and gamma-ray backgrounds in the fast ignition experiment

Y. Arikawa, T. Nagai, H. Hosoda, Y. Abe, S. Kojima, S. Fujioka, N. Sarukura, M. Nakai, H. Shiraga, T. Ozaki, and H. Azechi

Rev. Sci. Instrum. 83, 10D909 (2012); http://dx.doi.org/10.1063/1.4732180 (3 pages)

Online Publication Date: 24 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In the fast-ignition scheme, very hard x-rays (hereinafter referred to as γ-rays) are generated by Bremsstrahlung radiation from fast electrons. Significant backgrounds were observed around the deuterium–deuterium fusion neutron signals in the experiment in 2010. In this paper the backgrounds were studied in detail, based on Monte Carlo simulations, and they were confirmed to be γ-rays from the target, scattered γ-rays from the experimental bay walls (γ′-rays), and neutrons generated by (γ, n) reactions in either the target vacuum chamber or the diagnostic instruments (γ-n neutrons).
Show PACS
28.52.Av Theory, design, and computerized simulation
28.52.Cx Fueling, heating and ignition
28.52.Fa Materials
25.20.Dc Photon absorption and scattering

Validation of neutron emission profiles in MAST with a collimated neutron monitor

S. Sangaroon, M. Cecconello, S. Conroy, M. Weiszflog, M. Turnyanskiy, I. Wodniak, and G. Ericsson

Rev. Sci. Instrum. 83, 10D910 (2012); http://dx.doi.org/10.1063/1.4732059 (3 pages)

Online Publication Date: 27 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A neutron camera with liquid scintillator detectors is used in MAST to measure the neutron emissivity from D(d,n)3He reactions along collimated lines of sight. In this work, the measured recoil proton pulse height spectra generated in the detectors by the incident neutrons is modelled taking into account the energy spectrum of the generated neutrons, their spatial distribution and transport to the detectors as well as the detector's response function. The contribution of scattered neutrons to the pulse height spectrum is also modelled. Good agreement is found between the experimental data and the simulations. Examples are given showing the sensitivity of the recoil proton pulse height spectra to different observation angles with respect the neutral beam injection and the plasma rotation direction.
Show PACS
52.55.Fa Tokamaks, spherical tokamaks
28.52.Lf Components and instrumentation
52.50.Gj Plasma heating by particle beams

Characterizing time decay of bibenzyl scintillator using time correlated single photon counting

R. Hatarik, L. A. Bernstein, J. A. Caggiano, M. L. Carman, D. H. G. Schneider, N. P. Zaitseva, and M. Wiedeking

Rev. Sci. Instrum. 83, 10D911 (2012); http://dx.doi.org/10.1063/1.4732178 (3 pages) | Cited 1 time

Online Publication Date: 30 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The time decay of several scintillation materials has been measured using the time correlated single photon counting method and a new organic crystal with a highly suppressed delayed light has been identified. Results comparing the light decay of the bibenzyl crystal with a xylene based detector, which is currently installed at National Ignition Facility will be presented.
Show PACS
29.40.Mc Scintillation detectors
52.57.-z Laser inertial confinement
52.70.-m Plasma diagnostic techniques and instrumentation
07.60.Dq Photometers, radiometers, and colorimeters
28.52.-s Fusion reactors

Measuring the absolute deuterium–tritium neutron yield using the magnetic recoil spectrometer at OMEGA and the NIF

D. T. Casey, J. A. Frenje, M. Gatu Johnson, F. H. Séguin, C. K. Li, R. D. Petrasso, V. Yu. Glebov, J. Katz, J. P. Knauer, D. D. Meyerhofer, T. C. Sangster, R. M. Bionta, D. L. Bleuel, T. Döppner, S. Glenzer, et al.

Rev. Sci. Instrum. 83, 10D912 (2012); http://dx.doi.org/10.1063/1.4738657 (3 pages) | Cited 3 times

Online Publication Date: 31 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A magnetic recoil spectrometer (MRS) has been installed and extensively used on OMEGA and the National Ignition Facility (NIF) for measurements of the absolute neutron spectrum from inertial confinement fusion implosions. From the neutron spectrum measured with the MRS, many critical implosion parameters are determined including the primary DT neutron yield, the ion temperature, and the down-scattered neutron yield. As the MRS detection efficiency is determined from first principles, the absolute DT neutron yield is obtained without cross-calibration to other techniques. The MRS primary DT neutron measurements at OMEGA and the NIF are shown to be in excellent agreement with previously established yield diagnostics on OMEGA, and with the newly commissioned nuclear activation diagnostics on the NIF.
Show PACS
29.30.Hs Neutron spectroscopy
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.57.Fg Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.)
28.52.Cx Fueling, heating and ignition
28.52.Lf Components and instrumentation

Progress in obtaining an absolute calibration of a total deuterium–tritium neutron yield diagnostic based on copper activation

C. L. Ruiz, G. A. Chandler, G. W. Cooper, D. L. Fehl, K. D. Hahn, R. J. Leeper, B. R. McWatters, A. J. Nelson, R. M. Smelser, C. S. Snow, and J. A. Torres

Rev. Sci. Instrum. 83, 10D913 (2012); http://dx.doi.org/10.1063/1.4729495 (3 pages) | Cited 2 times

Online Publication Date: 9 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The 350-keV Cockroft-Walton accelerator at Sandia National laboratory's Ion Beam facility is being used to calibrate absolutely a total DT neutron yield diagnostic based on the 63Cu(n,2n)62Cu(β+) reaction. These investigations have led to first-order uncertainties approaching 5% or better. The experiments employ the associated-particle technique. Deuterons at 175 keV impinge a 2.6 μm thick erbium tritide target producing 14.1 MeV neutrons from the T(d,n)4He reaction. The alpha particles emitted are measured at two angles relative to the beam direction and used to infer the neutron flux on a copper sample. The induced 62Cu activity is then measured and related to the neutron flux. This method is known as the F-factor technique. Description of the associated-particle method, copper sample geometries employed, and the present estimates of the uncertainties to the F-factor obtained are given.
Show PACS
28.20.-v Neutron physics
25.45.-z 2H-induced reactions
25.40.Dn Elastic neutron scattering
06.20.fb Standards and calibration

Calibration of neutron-yield diagnostics in attenuating and scattering environments

K. D. Hahn, C. L. Ruiz, G. W. Cooper, A. J. Nelson, G. A. Chandler, R. J. Leeper, B. R. McWatters, R. M. Smelser, and J. A. Torres

Rev. Sci. Instrum. 83, 10D914 (2012); http://dx.doi.org/10.1063/1.4732067 (3 pages)

Online Publication Date: 9 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have performed absolute calibrations of a fusion-neutron-yield copper-activation diagnostic in environments that significantly attenuate and scatter neutrons. We have measured attenuation and scattering effects and have compared the measurements to Monte Carlo simulations using the Monte Carlo N-Particle code. We find that measurements and simulations are consistent within 10%.
Show PACS
52.70.Nc Particle measurements
06.20.fb Standards and calibration
28.20.Cz Neutron scattering
52.25.Tx Emission, absorption, and scattering of particles
52.58.-c Other confinement methods
52.65.Pp Monte Carlo methods

A novel method for modeling the neutron time of flight detector response in current mode to inertial confinement fusion experiments (invited)

A. J. Nelson, C. L. Ruiz, G. W. Cooper, G. A. Chandler, D. L. Fehl, K. D. Hahn, R. J. Leeper, R. Smelser, and J. A. Torres

Rev. Sci. Instrum. 83, 10D915 (2012); http://dx.doi.org/10.1063/1.4742140 (6 pages)

Online Publication Date: 10 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A novel method for modeling the neutron time of flight (nTOF) detector response in current mode for inertial confinement fusion experiments has been applied to the on-axis nTOF detectors located in the basement of the Z-Facility. It will be shown that this method can identify sources of neutron scattering, and is useful for predicting detector responses in future experimental configurations, and for identifying potential sources of neutron scattering when experimental set-ups change. This method can also provide insight on how much broadening neutron scattering contributes to the primary signals, which is then subtracted from them. Detector time responses are deconvolved from the signals, allowing a transformation from dN/dt to dN/dE, extracting neutron spectra at each detector location; these spectra are proportional to the absolute yield.
Show PACS
29.40.-n Radiation detectors
29.25.Dz Neutron sources

Fuel ion ratio measurements in reactor relevant neutral beam heated fusion plasmas

C. Hellesen, J. Eriksson, S. Conroy, G. Ericsson, M. Skiba, M. Weiszflog, and JET-EFDA Contributors

Rev. Sci. Instrum. 83, 10D916 (2012); http://dx.doi.org/10.1063/1.4738647 (3 pages)

Online Publication Date: 15 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In this paper, we present a method to derive nt/nd using the ratio of the thermonuclear neutron emission to the beam-target neutron emission. We apply it to neutron spectroscopy data from the magnetic proton recoil spectrometer taken during the deuterium tritium experiment at JET. nt/nd-values obtained using neutron spectroscopy are in qualitative agreement with those from other diagnostics measuring the isotopic composition of the exhaust in the divertor.
Show PACS
28.52.Fa Materials
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Gj Plasma heating by particle beams
52.55.Fa Tokamaks, spherical tokamaks
52.70.Nc Particle measurements
28.52.Cx Fueling, heating and ignition

The Radiochemical Analysis of Gaseous Samples (RAGS) apparatus for nuclear diagnostics at the National Ignition Facility (invited)

D. A. Shaughnessy, C. A. Velsko, D. R. Jedlovec, C. B. Yeamans, K. J. Moody, E. Tereshatov, W. Stoeffl, and A. Riddle

Rev. Sci. Instrum. 83, 10D917 (2012); http://dx.doi.org/10.1063/1.4742145 (5 pages)

Online Publication Date: 23 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The Radiochemical Analysis of Gaseous Samples (RAGS) diagnostic apparatus was recently installed at the National Ignition Facility (NIF). Following a NIF shot, RAGS is used to pump the gas load from the NIF chamber for purification and isolation of the noble gases. After collection, the activated gaseous species are counted via gamma spectroscopy for measurement of the capsule areal density and fuel-ablator mix. Collection efficiency was determined by injecting a known amount of 135Xe into the NIF chamber, which was then collected with RAGS. Commissioning was performed with an exploding pusher capsule filled with isotopically enriched 124Xe and 126Xe added to the DT gas fill. Activated xenon species were recovered post-shot and counted via gamma spectroscopy. Results from the collection and commissioning tests are presented. The performance of RAGS allows us to establish a noble gas collection method for measurement of noble gas species produced via neutron and charged particle reactions in a NIF capsule.
Show PACS
52.70.La X-ray and γ-ray measurements
82.30.-b Specific chemical reactions; reaction mechanisms
07.85.Nc X-ray and γ-ray spectrometers
29.30.Kv X- and γ-ray spectroscopy
52.58.-c Other confinement methods

Copper activation deuterium-tritium neutron yield measurements at the National Ignition Facility

G. W. Cooper, C. L. Ruiz, R. J. Leeper, G. A. Chandler, K. D. Hahn, A. J. Nelson, J. A. Torres, R. M. Smelser, B. R. McWatters, D. L. Bleuel, C. B. Yeamans, K. M. Knittel, D. T. Casey, J. A. Frenje, M. Gatu Johnson, et al.

Rev. Sci. Instrum. 83, 10D918 (2012); http://dx.doi.org/10.1063/1.4746999 (3 pages) | Cited 3 times

Online Publication Date: 30 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A DT neutron yield diagnostic based on the reactions, 63Cu(n,2n)62Cu(β+) and 65Cu(n,2n) 64 Cu(β+), has been fielded at the National Ignition Facility (NIF). The induced copper activity is measured using a NaI γ-γ coincidence system. Uncertainties in the 14-MeV DT yield measurements are on the order of 7% to 8%. In addition to measuring yield, the ratio of activities induced in two, well-separated copper samples are used to measure the relative anisotropy of the fuel ρR to uncertainties as low as 5%.
Show PACS
25.40.Dn Elastic neutron scattering
27.50.+e 59 ≤ A ≤ 89
82.80.Jp Activation analysis and other radiochemical methods

High-resolution spectroscopy used to measure inertial confinement fusion neutron spectra on Omega (invited)

C. J. Forrest, P. B. Radha, V. Yu. Glebov, V. N. Goncharov, J. P. Knauer, A. Pruyne, M. Romanofsky, T. C. Sangster, M. J. Shoup, III, C. Stoeckl, D. T. Casey, M. Gatu-Johnson, and S. Gardner

Rev. Sci. Instrum. 83, 10D919 (2012); http://dx.doi.org/10.1063/1.4742926 (6 pages) | Cited 4 times

Online Publication Date: 4 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The areal density (ρR) of cryogenic DT implosions on Omega is inferred by measuring the spectrum of neutrons that elastically scatter off the dense deuterium (D) and tritium (T) fuel. Neutron time-of-flight (nTOF) techniques are used to measure the energy spectrum with high resolution. High signal-to-background data has been recorded on cryogenic DT implosions using a well-collimated 13.4-m line of sight and an nTOF detector with an advanced liquid scintillator compound. An innovative method to analyze the elastically scattered neutron spectra was developed using well-known cross sections of the DT nuclear reactions. The estimated areal densities are consistent with alternative ρR measurements and 1-D simulations.
Show PACS
29.30.Hs Neutron spectroscopy
29.40.Mc Scintillation detectors
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Nc Particle measurements
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment
28.52.Cx Fueling, heating and ignition

Perpendicular and tangential angularly resolved multi-sight neutral particle analyzer system in LHD

T. Ozaki, E. Veshchev, T. Ido, A. Shimizu, P. Goncharov, and S. Sudo

Rev. Sci. Instrum. 83, 10D920 (2012); http://dx.doi.org/10.1063/1.4742925 (3 pages)

Online Publication Date: 24 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The particle loss in a helical plasma can be found by measuring the angular distribution of the energetic neutral particles using the angularly resolved multi-sightline neutral particle analyzer (ARMS). In ARMS, the AXUV detector with 20 segments usually used as UV monitor is utilized as the particle detector. Two ARMSs, which are installed with perpendicular and tangential views are operated for measuring the real time neutral particle distribution and investigating the particle loss.
Show PACS
52.70.Nc Particle measurements
52.55.Jd Magnetic mirrors, gas dynamic traps
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close