scholarly journals The Construction and Parameters of Forward Hadron Calorimeter (FHCAL) at MPD/NICA

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 149 ◽  
Author(s):  
D Finogeev ◽  
M Golubeva ◽  
F Guber ◽  
A Ivashkin ◽  
A Izvestny ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Heavy Ions ◽  
Reaction Plane ◽  
Experimental Setup ◽  
Collision Point ◽  
Hadron Calorimeter ◽  
Collision Centrality

Forward hadron calorimeter (FHCAL) at MPD/NICA experimental setup is intended for the measurements of the geometry of heavy ions collisions, namely, the collision centrality and the orientation of the reaction plane. FHCAL consists of two identical arms placed at the left/right sides from the beam collision point. This is a modular lead- scintillator compensating calorimeter designed to measure the energy distribution of the projectile nuclei fragments (spectators) and forward going particles close to the beam rapidity.

scholarly journals New forward hadron calorimeter for centrality and reaction plane determination at BM@N heavy ion experiments

2019 ◽  
Vol 204 ◽  
pp. 07007 ◽  
Author(s):  
F. Guber ◽  
D. Borisenko ◽  
D. Finogeev ◽  
M. Golubeva ◽  
A. Ivashkin ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Heavy Ion ◽  
Reaction Plane ◽  
Heavy Ion Experiments ◽  
Radiation Doses ◽  
Hadron Calorimeter ◽  
Zero Degree Calorimeter ◽  
Plane Orientation ◽  
Zero Degree ◽  
Simulation Results

It is proposed to replace existing Zero Degree Calorimeter of the BM@N setup at the Nuclotron (JINR) by a new forward hadron calorimeter for the measurement of the collision centrality and reaction plane orientation in heavy ions experiments. This calorimeter with transverse and longitudinal segmentation will be assembled from modules presently constructed for FHCal MPD and PSD CBM. The proposed design of the new calorimeter, simulation results for centrality and reaction plane determination by the new calorimeter, as well as radiation doses in the calorimeter simulated by FLUKA are discussed. The performance of hadron calorimeter supermodule studied at CERN is shown.

scholarly journals Determination of geometry of heavy ion collisions with forward hadron calorimeter (FHCal) at MPD/NICA

2019 ◽  
Vol 204 ◽  
pp. 07002 ◽  
Author(s):  
Alexander Ivashkin ◽  
Dmitry Finogeev ◽  
Marina Golubeva ◽  
Fedor Guber ◽  
Alexander Izvestnyy ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Heavy Ion ◽  
Reaction Plane ◽  
Heavy Ion Collision ◽  
Collision Point ◽  
Ion Collisions ◽  
Peripheral Collisions ◽  
Ion Collision ◽  
Energy Asymmetry

The main purpose of the FHCal is to provide an experimental measurement of a heavy-ion collision centrality (impact parameter) and orientation of its reaction plane. FHCal consists of two identical arms placed at the left/right sides from the beam collision point. Due to the fine modular structure and detection of spectators in both forward/backward regions, the angular resolution of the reaction plane reconstruction is below 30 degrees. Since the heavy fragments escape into beam holes, it is not possible to distinguish the central and peripheral collisions using only the deposited energies in FHCal. The subdivision of the calorimeter into two, inner and outer parts, and the calculation of the energy depositions separately in these calorimeter parts allow one to construct a new observable, the energy asymmetry. Taking the two-dimensional correlation between the energy asymmetry and full energy deposition in the calorimeter, it would be possible to resolve the ambiguity in the centrality determination.

scholarly journals Application of FHCal for Heavy-Ion Collision Centrality Determination in MPD/NICA Experiment

Particles ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 236-240
Author(s):  
Vadim Volkov ◽  
Marina Golubeva ◽  
Fedor Guber ◽  
Alexander Ivashkin ◽  
Nikolay Karpushkin ◽  
...  
Keyword(s):  
Time Projection Chamber ◽  
Energy Deposition ◽  
Heavy Ion ◽  
Heavy Ion Collision ◽  
Energy Distributions ◽  
Hadron Calorimeter ◽  
Collision Centrality ◽  
Time Projection ◽  
Ion Collision

Two approaches related to the centrality determination in heavy-ion Multi-Purpose Detector (MPD) experiments, using charge-particles multiplicity in Time Projection Chamber (TPC) and the energy deposition in Forward Hadron Calorimeter (FHCal) are discussed. The main features of the FHCal are the fine transverse segmentation and the beam holes in the center of the calorimeters. Leaking the heavy non-interacting fragments (spectators) leads to ambiguity in the dependence of energy deposition in the FHCal on the collision centrality. However, the calorimeter transverse segmentation allows one to measure the energy distributions in each of the FHCal modules and to construct combined observables to resolve the problems associated with the beam hole. The comparison of these approaches in the collision centrality measurements is discussed.

New forward hadron calorimeter and hodoscope for the BM@N heavy ions experiment

2020 ◽  
Vol 15 (05) ◽  
pp. C05020-C05020
Author(s):  
F. Guber ◽  
D. Finogeev ◽  
M. Golubeva ◽  
A. Ivashkin ◽  
A. Izvestnyy ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Hadron Calorimeter

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

Specimen Preparation of Near Surface Ion Irradiated Samples

1985 ◽  
Vol 43 ◽  
pp. 170-171
Author(s):  
K. F. Russell ◽  
L. L. Horton
Keyword(s):  
Radiation Damage ◽  
Heavy Ions ◽  
Target Material ◽  
Metal Alloys ◽  
Specimen Surface ◽  
Specimen Preparation ◽  
Particle Accelerators ◽  
Near Surface ◽  
Graaff Accelerator ◽  
Van De Graaff

Beams of heavy ions from particle accelerators are used to produce radiation damage in metal alloys. The damaged layer extends several microns below the surface of the specimen with the maximum damage and depth dependent upon the energy of the ions, type of ions, and target material. Using 4 MeV heavy ions from a Van de Graaff accelerator causes peak damage approximately 1 μm below the specimen surface. To study this area, it is necessary to remove a thickness of approximately 1 μm of damaged metal from the surface (referred to as “sectioning“) and to electropolish this region to electron transparency from the unirradiated surface (referred to as “backthinning“). We have developed electropolishing techniques to obtain electron transparent regions at any depth below the surface of a standard TEM disk. These techniques may be applied wherever TEM information is needed at a specific subsurface position.

Magnetic energy distribution in polycrystalline sputtered CoCr magnetic thin films

2008 ◽  
Vol 42 (2) ◽  
pp. 125-128
Author(s):  
J. F. Al-Sharab ◽  
J. E. Wittig ◽  
G. Bertero ◽  
T. Yamashita ◽  
J. Bentley ◽  
...  
Keyword(s):  
Thin Films ◽  
Energy Distribution ◽  
Magnetic Energy ◽  
Magnetic Thin Films
Sign in / Sign up

Export Citation Format

Share Document