TPG, test results Ableev, V.; Ambrosino, F.; Apollonio, M. ...
IEEE transactions on nuclear science,
12/2005, Volume:
52, Issue:
6
Journal Article
Peer reviewed
TPG is the acronym for Time Projection Chamber with GEM amplification, high-granularity hexaboard read-out and FADC electronics. We have constructed a TPG read-out module, called TPG-head, with three ...GEM foils and a multilayer board, called hexaboard, covered with 710 000 hexagonal pads of 300 mum size. The total active area of this module is a disk of 30 cm diameter. The 710 000 pads are read by three sets of 576 strips dephased by 120 degrees. Each strip is read by a FADC channel with 100 ns sampling time. The module is mounted in a test-bed formed by a cylindrical field cage of 80 cm diameter and 150 cm length inside a solenoidal magnet that operates with a magnetic field up to B=0.7 Tesla. Tests with X-ray sources show an intrinsic spatial resolution of the order of 40 mum. The threshold for transverse momentum measurement of low energy tracks is below 0.1 MeV/c with a magnetic field of 0.07 Tesla. At 0.7 Tesla the intrinsic space point resolution of the chamber is such that the error on the measurement of the transverse momentum is DeltaP t sime0.1 MeV/c in absence of distortions from the drift region
TPG construction Ableev, V.; Ambrosino, F.; Apollonio, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2004, Volume:
535, Issue:
1
Journal Article
Peer reviewed
TPG is the acronym for a 3D imaging gas chamber with GEM amplification, hexaboard read-out and FADC electronics. We have constructed a TPG-head with three GEM foils (30
cm diameter) and a read-out ...board (30
cm diameter active surface) covered with 710,000 hexagonal pads of
300
μ
m
size. Aligned pads are connected in parallel to one strip out of three sets of 576 parallel strips (
500
μ
m
pitch). The three sets of strips run at
120
∘
from each other and at three different depths inside the hexaboard multilayer structure. Each strip is read out by FADC electronics. The TPG-head is under initial test in a small container with a drift volume 33
mm long and of 30
cm diameter. A 150
cm long drift volume inside a 0.7
T solenoidal magnetic field has been prepared by using HARP-TPC instrumentation as test bed.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
13.
TPG development Ableev, V.; Ambrosino, F.; Apollonio, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2004, Volume:
518, Issue:
1
Journal Article
Peer reviewed
TPG is the acronym for Time Projection chamber with GEM amplification, hexaboard read-out and FADC electronics. We are constructing a TPG read-out module with three GEM foils (30
cm diameter) and a ...read-out board (30
cm diameter active surface) covered with hexagonal pads of 300
μm size. Aligned pads are connected in parallel to one strip out of three sets of parallel strips. Each strip is read by FADC electronics. The test bench for the TPG head will be the HARP-TPC field cage. TPG characteristics, design and expected performances are discussed.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
A 4π detection system sensitive to light charged particles is being developed at the Laboratori Nazionali di Legnaro (LNL) for the study of the reaction mechanisms produced in heavy-ion collisions at ...energies up to 20
AMeV. The 8πLP apparatus is a telescope assembly characterized by large solid angle (90% of 4π) and high granularity (262 modules). Particle identification at low energy is enhanced by combining Δ
E–
E, TOF and PSD techniques. Thresholds for particle identification range from 1
MeV for protons and 3
MeV for alpha particles to about 2–3
AMeV for C ions. The system is fully operational for experiments.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Summary A plasmacytoid variant of urothelial carcinoma has been recently recognized in the World Health Organization classification system. This is characterized by a discohesive growth of ...plasmacytoid cells with eccentric nuclei, extending in the bladder wall and often in the perivesical adipose tissue. Herein, we report the clinicopathologic, immunohistochemical, ultrastructural, and molecular features of a series of plasmacytoid urothelial carcinoma of the urinary bladder. Four bladder carcinomas characterized by epithelial cells with morphologic appearance resembling plasma cells were evaluated at the immunohistochemical, electron microscopic, and molecular genetic levels. Tumor cells stained with cytokeratins, epithelial membrane antigen, GATA-3 (endothelial transcription factor 3), CD15, p53, and p16. In addition, malignant cells strongly stained with CD138 in all the cases, whereas leukocyte common antigen and multiple myeloma 1/interferon regulatory factor 4 were completely negative, nor immunoreactivity was seen for either κ or λ light chains. The electron microscopic examination showed the presence of divergent squamous and glandular differentiation. At variance with conventional urothelial carcinoma, the analysis of exons 4-9 of TP53 gene revealed no alteration in all the 4 tumors tested, and this can be of value in choosing additional chemotherapy after surgery. Plasmacytoid carcinoma of the bladder is a tumor entity, which can be characterized by specific immunohistochemical markers, including positivity for GATA-3, and presents phenotypic and genotypic peculiarities.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
In the framework of the SPES project at LNL A. Bracco, A. Pisent (Ed.), REP 181/02, LNL-INFN, 2002, the realization of a direct ISOL Target for a mid-term radioactive ion beam facility is in ...progress. Using a primary proton beam of energy 40MeV and intensity 0.2mA, a high number of fission products will be obtained in the SPES multi-foil uranium carbide target, keeping a low power density deposition in the refractory matrix A. Andrighetto, S. Cevolani, C. Petrovich, Eur. Phys J. A 25 (2005) 41. The exotic species produced by Uranium fission in the target are collected in the ion source after the diffusion and the effusion processes. When short lived isotopes are produced it is very important to optimize the release properties of the target. To this purpose the RIBO code (radioactive ion beam optimiser) M. Santana Leitner, A Monte Carlo Code to Optimize the Production of Radioactive Ion Beams by the ISOL Technique, PhD. Thesis, UPC-ETSEIB/CERN has been used in order to estimate the target release efficiency for some neutron-rich nuclei. A SiC prototype of the target was recently produced at LNL and tested at ORNL using a 42MeV proton beam. The yield of some aluminum isotopes was measured as a function of the target temperature. Some preliminary results of the data analysis will be presented.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
19.
Commissioning of the ALPI post-accelerator Dainelli, A; Bassato, G; Battistella, A ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/1996, Volume:
382, Issue:
1
Journal Article
Peer reviewed
The commissioning phase of the ALPI post-accelerator started at the beginning of 1994 with the installation of the medium beta section (
β = 0.11). Test beams of different injection energies and ion ...species have been accelerated with ALPI and delivered to the experimental halls. The main components of the post-accelerator, namely the cryogenic plant, the pulsing system, the optical and diagnostic elements for the beam transport, the vacuum, rf and control systems was widely tested under different conditions. The average accelerating field over the 44 installed superconducting lead on copper resonators turns out to be 2.5 MV/m and the phase locking procedure for the 48 resonators (accelerating and buncher cavities) is normally completed in about 10 hours. The overall beam transmission towards the post-accelerator is 70% with the DC beam and up to 50% with the pulsed and accelerated beam with currents on the target of the order of some p nA.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
