The energy dependence of the energy and position resolutions of the electromagnetic calorimeter prototype made of lead tungstate crystals produced in Bogoroditsk (Russia) and Shanghai (China) is ...presented. These measurements were carried out at the Protvino accelerator using a 1–
45
GeV
electron beam. The crystals were coupled to photomultiplier tubes. The dependence of energy and position resolutions on different factors as well as the measured electromagnetic shower lateral profile are presented.
The electromagnetic calorimeter of PANDA at the FAIR facility will rely on the operation of lead tungstate (PbWO
4, PWO) scintillating crystals at temperatures near
-
25
∘
C
to provide sufficient ...resolution for photons in the energy range from 8
GeV down to 10
MeV. The radiation hardness of PWO crystals was studied at the IHEP (Protvino) irradiation facility in the temperature range from
+
20
∘
C
(room temperature) down to
-
23
∘
C
. These studies have indicated significantly different behavior in the time evolution of the damaging processes well below room temperature. Different signal loss levels at the same dose rate but at different temperatures were observed. The effect of a deep suppression of the crystal recovery process at temperatures below
0
∘
C
has been seen.
Studies of the radiation hardness of lead tungstate crystals produced by the Bogoroditsk Techno-Chemical Plant in Russia and the Shanghai Institute of Ceramics in China have been carried out at IHEP, ...Protvino. The crystals were irradiated by a 40GeV pion beam. After full recovery, the same crystals were irradiated using a 137Csγ-ray source. The dose rate profiles along the crystal length were observed to be quite similar. We compare the effects of the two types of radiation on the crystal's light output.
The results of tests on a compensated lead hadron calorimeter with cell size 10×10
cm
2, thickness 8 nuclear interaction lengths and sampling of 16
mm lead, 4
mm scintillator, with hadron, electron ...and lead–ion beams up to 32
TeV total energy are presented. The hadronic energy resolution of the calorimeter is 57%/
E
, the nonuniformity is better than 10% and the measured ratio
e/
h=1.01. Five hundred cells of this calorimeter have been made for experiments at CERN and IHEP, Protvino.
We report on the effects of radiation on the light output of lead tungstate crystals. The crystals were irradiated by pure, intense high-energy electron and hadron beams as well as by a mixture of ...hadrons, neutrons and gammas. The crystals were manufactured in Bogoroditsk, Apatity (both Russia), and Shanghai (China). These studies were carried out at the 70-GeV proton accelerator in Protvino.
The association of type 2 diabetes mellitus (T2DM) with the
and
genes in the Russian population has not been well studied. In this study, we analysed the population frequencies of polymorphic markers ...of these genes.
The study included 862 patients with T2DM and 443 control subjects of Russian origin. All subjects were genotyped for 10 single nucleotide polymorphisms (SNPs) of the genes using real-time PCR (TaqMan assays). HOMA-IR and HOMA-
were used to measure insulin resistance and
-cell secretory function, respectively.
The analysis of the frequency distribution of polymorphic markers for genes
and
showed statistically significant associations with T2DM in the Russian population. The association between the
gene and T2DM was not statistically significant. The polymorphic markers
of the
gene,
of the
gene,
of the
gene and
,
and
of the
gene showed a significant association with impaired glucose metabolism or impaired
-cell function.
In the Russian population, genes, which affect insulin synthesis and secretion in the
-cells of the pancreas, play a central role in the development of T2DM.
A highly stable monitoring system based on blue and red light emitting diodes coupled to a distribution network comprised of optical fibers has been developed for an electromagnetic calorimeter that ...uses lead tungstate crystals readout with photomultiplier tubes. We report of the system prototype design and on the results of laboratory tests. Stability better than 0.1% (r.m.s.) has been achieved during one week of prototype operation.
The BTeV electromagnetic calorimeter Brennan, T; Butler, J; Cheung, H ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2002, Letnik:
494, Številka:
1
Journal Article
Recenzirano
The electromagnetic calorimeter for a new Fermilab collider program named BTeV is based on lead tungstate scintillating crystals (PbWO
4). Various properties of crystals manufactured by Russian and ...Chinese companies were measured at the U70 accelerator in Protvino. A dedicated beam momentum tagging system was used to measure the energy and spatial resolution.
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