scholarly journals Impact of the positive ion current on large size neutrino detectors and delayed photon emission

2018 ◽  
Vol 13 (04) ◽  
pp. C04015-C04015 ◽  
Author(s):  
R. Santorelli ◽  
S. di Luise ◽  
E. Sanchez Garcia ◽  
P. Garcia Abia ◽  
T. Lux ◽  
...  
Keyword(s):  
Photon Emission ◽  
Ion Current ◽  
Neutrino Detectors ◽  
Large Size ◽  
Positive Ion

scholarly journals Floating Multiple Probe Systems for Plasma Measurements

1962 ◽  
Vol 15 (2) ◽  
pp. 162 ◽  
Author(s):  
KM Burrows
Keyword(s):  
Electron Temperature ◽  
Voltage Characteristic ◽  
Ion Current ◽  
Current Voltage Characteristic ◽  
Ion Movement ◽  
Current Voltage ◽  
Probe System ◽  
Multiple Probe ◽  
Plasma Measurements ◽  
Positive Ion

A new analysis of the current voltage characteristic of a floating double probe system is given, showing that the electron temperature must be estimated from measurements at the point of inflection of the characteristic if positive ion movement contributes to the probe circuit current. Temperature measurements will still be in error if the rates of variation of positive ion current to the two probes are not closely similar as the potential difference between them is varied. An alternative experimental technique is described which will yield correct temperature estimates in such circumstances, and is simpler and less perturbing to the plasma than the floating triple probe method.

The Positive Ion Current at the Cathode in the Glow Discharge

1932 ◽  
Vol 42 (6) ◽  
pp. 786-794 ◽  
Author(s):  
A. Keith Brewer ◽  
R. R. Miller
Keyword(s):  
Glow Discharge ◽  
Ion Current ◽  
Positive Ion

scholarly journals Influence of the Ion Mass in the Radial to Orbital Transition in Weakly Collisional Low-Pressure Plasmas Using Cylindrical Langmuir Probes

2020 ◽  
Vol 10 (17) ◽  
pp. 5727 ◽  
Author(s):  
Guillermo Fernando Regodón ◽  
Juan Manuel Díaz-Cabrera ◽  
José Ignacio Fernández Palop ◽  
Jerónimo Ballesteros
Keyword(s):  
Free Path ◽  
Debye Length ◽  
Mean Free Path ◽  
Low Pressure ◽  
Plasma Potential ◽  
Ion Current ◽  
Ion Temperature ◽  
Langmuir Probes ◽  
The Relationship ◽  
Positive Ion

This paper presents an experimentally observed transition from the validity of the radial theories to the validity of the orbital theories that model the ion current collected by a cylindrical Langmuir probe immersed in low-pressure, low-temperature helium plasma when it is negatively biased with respect to the plasma potential, as a function of the positive ion-neutral collision mean free path to the Debye length ratio Λ=λ+/λD. The study has been also conducted on argon and neon plasmas, which allows a comparison based on the mass of the ions, although no transition has been observed for these gases. As the radial or orbital behavior of the ions is essential to establish the validity of the different sheath theories, a theoretical analysis of such a transition not only as a function of the parameters Λ and β=T+/Te, T+ and Te being the positive ion and electron temperature, respectively, but also as a function of the ion mass is provided. This study allows us to recognize the importance of the mass of the ion as the parameter that explains the transition in helium plasmas. Motivated by these theoretical arguments, a novel set of measurements has been performed to study the relationship between the Λ and β parameters in the transition that demonstrate that the effect of the ion mean free path cannot be completely ignored and also that its influence on the ion current collected by the probe is less important than the effect of the ion temperature.

scholarly journals Scaling studies for deep learning in Liquid Argon Time Projection Chamber event classification

2019 ◽  
Vol 214 ◽  
pp. 06016
Author(s):  
Jan Strube ◽  
Kolahal Bhattacharya ◽  
Eric Church ◽  
Jeff Daily ◽  
Schram Malachi ◽  
...  
Keyword(s):  
Deep Learning ◽  
Time Projection Chamber ◽  
Liquid Argon ◽  
Classification Problem ◽  
Classification Performance ◽  
Network Architectures ◽  
Neutrino Detectors ◽  
Large Size ◽  
Learning Techniques ◽  
Time Projection

Measurements in Liquid Argon Time Projection Chamber neutrino detectors feature large, high fidelity event images. Deep learning techniques have been extremely successful in classification tasks of photographs, but their application to these event images is challenging, due to the large size of the events, more two orders of magnitude larger than images found in classical challenges like MNIST or ImageNet. This leads to extremely long training cycles, which slow down the exploration of new network architectures and hyperpa-rameter scans to improve the classification performance. We present studies of scaling an LArTPC classification problem on multiple architectures, spanning multiple nodes. The studies are carried out in simulated events in the Micro-BooNE detector.

Sign in / Sign up

Export Citation Format

Share Document