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The Target Absorbers for Neutrals (TANs) are located in a high intensity radiation environment inside the tunnel of the Large Hadron Collider (LHC). TANs are positioned about 140 m downstream from the beam interaction points. Seven 40-cm long fused silica rods with different dopant specifications were irradiated in the TAN by the Beam RAte of Neutrals (BRAN) detector group duringp+pdata taking from 2016 to 2018 at the LHC. The peak dose delivered to the fused silica rods was 18 MGy. We report measurements of theNa22activation of the fused silica rods carried out at the University of Illinois at Urbana-Champaign and Argonne National Laboratory. At the end of the irradiation campaign, the maximumNa22activity observed wasA=21kBq/cm3corresponding to a density,ρ=2.5×1012/cm3, ofNa22 nuclei. fluka Monte Carlo simulations have been performed by the CERN fluka team to estimateNa22activities for the irradiated BRAN rod samples. The simulations reproduce theNa22activity profile measured along the rods, with a 35% underestimation of the experimental measurement results.

Measurements of high-pT processes in lead-lead collisions can provide insight into the physics responsible for the quenching of jets in the quark gluon plasma. Results are presented from ATLAS measurements of single jet suppression, both inclusively and as a function of the azimuthal angle of the jets with respect to the elliptic flow plane, single jet fragmentation, and gamma-jet correlations. Implications of the results are discussed. Results are also presented for measurements of photon and Z boson production that provide essential tests on calculations of hard scattering rates using binary collision scaling.

Measurements of forward neutrons in pp collisions will allow us to investigate π- p cross-section via one-pion exchange process, which are important for air shower development. However, the precision of these measurements is limited by the energy resolution of the LHCf detectors. To improve it, a joint measurement with the ATLAS ZDC was planned. In 2021, a beam test was conducted to evaluate the performance of the joint measurement of the LHCf-Arm1 and ZDC detectors using proton beams of 350 GeV at SPS. Combining the LHCf data with the ZDC data, we confirmed that the energy resolution improved from about 40% to 21.4%.

The Target Absorbers for Neutrals (TANs) are located in a high intensity radiation environment inside the tunnel of the Large Hadron Collider (LHC). TANs are positioned about 140 m downstream from the beam interaction points. Seven 40-cm long fused silica rods with different dopant specifications were irradiated in the TAN by the Beam RAte of Neutrals (BRAN) detector group during p+p data taking from 2016 to 2018 at the LHC. The peak dose delivered to the fused silica rods was 18 MGy. We report measurements of the ²2Na activation of the fused silica rods carried out at the University of Illinois at Urbana-Champaign and Argonne National Laboratory. At the end of the irradiation campaign, the maximum ²2Na activity observed was A=21 kBq/cm³ corresponding to a density, ρ=2.5×10¹2/cm³, of ²2Na nuclei. fluka Monte Carlo simulations have been performed by the CERN fluka team to estimate ²2Na activities for the irradiated BRAN rod samples. The simulations reproduce the ²2Na activity profile measured along the rods, with a 35% underestimation of the experimental measurement results.

The Target Absorbers for Neutrals (TANs) represent one of the most radioactive regions in the Large Hadron Collider (LHC). Seven 40 cm long fused silica rods with different dopant specifications, manufactured by Heraeus, were irradiated in one of the TANs located around the ATLAS experiment by the Beam RAte of Neutrals (BRAN) detector group. This campaign took place during the Run 2 p+p data taking, which occurred between 2016 and 2018. This paper reports a complete characterization of optical transmission per unit length of irradiated fused silica materials as a function of wavelength (240 nm - 1500 nm), dose (up to 18 MGy), and level of OH and H\\(_2\\) dopants introduced in the manufacturing process. The dose delivered to the rods was estimated using Monte Carlo simulations performed by the CERN FLUKA team.

The Target Absorbers for Neutrals (TANs) are located in a high-intensity radiation environment inside the tunnel of the Large Hadron Collider (LHC). TANs are positioned about \\(140\\) m downstream from the beam interaction points. Seven \\(40\\) cm long fused silica rods with different dopant specifications were irradiated in the TAN by the Beam RAte of Neutrals (BRAN) detector group during \\(p\\)+\\(p\\) data taking from 2016 to 2018 at the LHC. The peak dose delivered to the fused silica rods was \\(18\\) MGy. We report measurements of the \\(^22\\)Na activation of the fused silica rods carried out at the University of Illinois at Urbana-Champaign and Argonne National Laboratory. At the end of the irradiation campaign, the maximum \\(^22\\)Na activity observed was \\(A=21\\) kBq\\(/ cm^3\\) corresponding to a density, \\(= 2.5 10^12 / cm^3\\), of \\(^22\\)Na nuclei. FLUKA Monte Carlo simulations have been performed by the CERN FLUKA team to estimate \\(^22\\)Na activities for the irradiated BRAN rod samples. The simulations reproduce the \\(^22\\)Na activity profile measured along the rods, with a 35% underestimation of the experimental measurement results.

This article presents a collection of simulation studies using the ECCE detector concept in the context of the EIC's exclusive, diffractive, and tagging physics program, which aims to further explore the rich quark-gluon structure of nucleons and nuclei. To successfully execute the program, ECCE proposed to utilize the detecter system close to the beamline to ensure exclusivity and tag ion beam/fragments for a particular reaction of interest. Preliminary studies confirmed the proposed technology and design satisfy the requirements. The projected physics impact results are based on the projected detector performance from the simulation at 10 or 100 fb^-1 of integrated luminosity. Additionally, a few insights on the potential 2nd Interaction Region can (IR) were also documented which could serve as a guidepost for the future development of a second EIC detector.

We performed feasibility studies for various single transverse spin measurements that are related to the Sivers effect, transversity and the tensor charge, and the Collins fragmentation function. The processes studied include semi-inclusive deep inelastic scattering (SIDIS) where single hadrons (pions and kaons) were detected in addition to the scattered DIS lepton. The data were obtained in pythia6 and geant4 simulated e+p collisions at 18 GeV on 275 GeV, 18 on 100, 10 on 100, and 5 on 41 that use the ECCE detector configuration. Typical DIS kinematics were selected, most notably \\(Q^2 > 1 \\) GeV\\(^2\\), and cover the \\(x\\) range from \\(10^-4\\) to \\(1\\). The single spin asymmetries were extracted as a function of \\(x\\) and \\(Q^2\\), as well as the semi-inclusive variables \\(z\\), and \\(P_T\\). They are obtained in azimuthal moments in combinations of the azimuthal angles of the hadron transverse momentum and transverse spin of the nucleon relative to the lepton scattering plane. The initially unpolarized MonteCarlo was re-weighted in the true kinematic variables, hadron types and parton flavors based on global fits of fixed target SIDIS experiments and \\(e^+e^-\\) annihilation data. The expected statistical precision of such measurements is extrapolated to 10 fb\\(^-1\\) and potential systematic uncertainties are approximated given the deviations between true and reconstructed yields. The impact on the knowledge of the Sivers functions, transversity and tensor charges, and the Collins function has then been evaluated in the same phenomenological extractions as in the Yellow Report. The impact is found to be comparable to that obtained with the parameterized Yellow Report detector and shows that the ECCE detector configuration can fulfill the physics goals on these quantities.

We performed feasibility studies for various measurements that are related to unpolarized TMD distribution and fragmentation functions. The processes studied include semi-inclusive Deep inelastic scattering (SIDIS) where single hadrons (pions and kaons) were detected in addition to the scattered DIS lepton. The single hadron cross sections and multiplicities were extracted as a function of the DIS variables \\(x\\) and \\(Q^2\\), as well as the semi-inclusive variables \\(z\\), which corresponds to the momentum fraction the detected hadron carries relative to the struck parton and \\(P_T\\), which corresponds to the transverse momentum of the detected hadron relative to the virtual photon. The expected statistical precision of such measurements is extrapolated to accumulated luminosities of 10 fb\\(^-1\\) and potential systematic uncertainties are approximated given the deviations between true and reconstructed yields.