1,721,102 research outputs found
First consideration on magnetic field for an accumulation cell
No full textThe short memo introduces the use of high temperature
superconductors for the transverse field of a polarized
gaseous target cell for PAX
Superconducting Magnetic Systems for High Energy Polarized Physics
No full textThe work of this thesis has been dedicated to the interaction region of the new generation experiments using internal storage cell . The items addressed concern both the gas polarized target and the tracking magnet, that are strictly connected. The gas target consist of the combination of a polarized atomic source, and a storage cell coaxial with the beam. In the atomic source, a system of small sextupoles polarizes and focalizes the atoms, that are injected in the storage cell. The cell is immersed in a holding magnetic field that assures longitudinal or transverse polarization. The field of the tracking magnet, surrounding the interaction region, must be null where the cell is located, to keep the polarization in the cell
The H and D Polarized Target for Spin-Filtering Measurements at COSY
No full textIn the main frame of the PAX (Polarized Antiproton eXperiments) collaboration, which engaged the challenging purpose of polarizing antiproton beams, the possibility to have H or D polarized targets requires a daily switchable source and its diagnostics: mainly change is a dual cavity tunable for H and D. The commissioning of PAX has been full-filled, for the transverse case, on the COSY (COoler SYnchrotron) proton ring, achieving milestones on spin-dependent cross-section measurements. Now the longitudinal case could provide sensitive polarization results. An H or D source allows the exploration of the spin-filtering process with a deuterium polarized target, and opens new chances for testing Time Reversal Invariance at COSY (TRIC)
A Bulk Superconducting Magnetic System for the CLAS12 Target at Jefferson Lab
No full textA feasibility study of a bulk magnetic system for the target of an
experiment to measure the transverse spin effects in semi-inclusive deep
inelastic scattering (SIDIS) at 11 GeV with a transversely polarized
target using the CLAS12 detector is presented. An experiment has been
approved with the highest priority rating to study spin azimuthal
asymmetries in SIDIS using 11-GeV polarized electron beams from the
upgraded CEBAF facility and the CLAS12 detector equipped with a
transversely polarized target. The transverse target in CLAS12 requires
the shielding of a volume inside the longitudinal field of the main
solenoid. In the shielded region, a transverse targetmagnet can operate;
for the proposed magnetic configuration, the main solenoid maximum
magnetic induction is 2 T. A bulk MgB2 cylinder cooled in liquid helium
is proposed both to shield the longitudinal field of the main solenoid
and to provide a transverse field induction up to 1.2 T for the hydrogen
deuteride ice (HD-ice) target. The installation and magnetization
procedure will be described: The magnetization procedure has to be
compatible with the polarization and installation procedure of the
HD-ice target. The design of a test bench to measure the transverse
magnetization of a MgB2 bulk cylinder cooled by a coldhead is presented
together with the scheduled measurements
IRIS. The Italian research infrastructure on applied superconductivity for particle accelerators and societal applications
Full text linkThe Italian Minister for University and Research has recently funded a large program for an Innovative Research infrastructure on applied Superconductivity in Italy. Based on the LASA lab in Milan it is a partnership among: INFN (leader, participating with 4 labs: Frascati, Genoa, Milan, Salerno); CNR (SPIN institute in Genoa, Naples and Salerno); five Universities: Genoa, Milan, Naples, Salento and Salerno. The infrastructure will expand and coordinate existing infrastructures, with new state of the art instruments for: 1) characterization of new superconducting wires/tapes and cables at high field and large current; 2) for implementing the construction of innovative small scale superconducting magnets or accelerator, beam lines and detectors; 3) developing advanced instrumentation and measurements for magnets and accelerators; 4) for testing large superconducting magnets and high power transmission superconducting lines; 5) for characterization of new superconducting materials and magnetism in matter. IRIS will be a key feature for participation to future projects requiring advanced superconducting technology, like FCC or the Mun-Collider, and also for developing societal applications, especially in the energy domain and the medical sector, of technologies pursued for high-energy accelerators. The paper will illustrate the IRIS project, its 3-year development and the idea to make it an open-access infrastructure
The Field Mapping at Low Temperature of a NbTi Setupole
No full textThe next generation of polarized high energy physics experiments at accelerators employing internal targets requires a significant increase in density of the target. In an atomic beam source electron polarization is obtained from Stern-Gerlach separation by sextupole magnets and then transferred to nuclei by means of RF transitions. The Università di Ferrara and INFN group is developing a new ABS characterized by a high intensity beam, using superconducting sextupoles instead of a permanent magnet system. The field mapping of a NbTi sextupole performed in Ferrara at low temperature and full current is presented. A dedicated test bench was employed for the low temperature field map in the Ferrara laboratory
A superconducting magnets system for a low beta section at COSY and AD
No full textIn the framework of the FAIR project (GSI, Darmstadt, D), the PAX collaboration has suggested new experiments using polarized
antiprotons. The central physics issue is now to study the polarization build-up by spin filtering of antiprotons via multiple passages through an internal polarized gas target. The goals for spin-filtering experiments with protons at COSY Forrschungzentrum Juelich, D) are to test our understanding of the spin-filtering processes and to commission the setup for the experiments with antiprotons at the AD (CERN). Spin-filtering experiments with antiprotons at the AD will allow us to determine the total spin-dependent transversal and longitudinal cross sections. The low-beta section at COSY is composed of two
superconducting quadrupole magnets on each side of the target, while at the AD, we will use three quadrupoles on each side.
Technical problems and details of the superconducting quadrupoles with their respective cryogenics will be discussed. A flexible cryogenic system fitting at COSY and AD ring characterized by a low liquid helium consumption will be discussed. The status of the construction of the quadrupoles will be reported as well
A HIGH INTENSITY COLD SUPERCONDUCTING JET POLARIZED TARGET
No full textA proposed Atomic beam source with superconducting magnets in theory can provide higher intensity in atomic beam. Investigation on the formation, attenuation, focalization of different source is performed in order to provide a tools to find the right way to fulfill the requirement for more intense nuclear targets
A magnetic system for the CLAS12 proposal
No full textThe conceptual design of a magnetic system for an experiment to measure the transverse spin effects in SIDIS at 11 GeV with a transversely polarized target using the CLAS12 detector at Jefferson Lab is presented. A proposal has been submitted to study spin azimuthal asymmetries in semi-inclusive Deep Inelastic Scattering (SIDIS) using an 11 GeV polarized electron beam from the upgraded CEBAF facility and the CLAS12 detector equipped with a transversely polarized target. The main focus of the experiment will be the measurement of transverse target single and double spin asymmetries (TTSA) in the reaction epa ̈ ehX, where e is an electron, pa is transversely polarized proton, h is a meson (e.g. a pion or a kaon) and X is the undetected final state. The details of the conceptual design of the shielding magnetic system and transverse dipole are reported
Lattice studies for low-beta sections at COSY and AD of CERN for spin-filtering studies
No full textIn the framework of the FAIR project, the PAX collaboration
has suggested new experiments using polarized antiprotons
. The central physics issue is now to study the polarization
build-up by spin filtering of antiprotons via multiple
passage through an internal polarized gas target. The goals
for spin-filtering experiments with protons at COSY are to
test our understanding of the spin-filtering processes and to
commission the setup for the experiments with antiprotons
at the Antiproton Decelerator (CERN). Spin-filtering experiments
with antiprotons at the AD will allow us to determine
the total spin-dependent transversal and longitudinal cross
sections
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