I would like to extend my warm welcome to all the ANPA members who have gathered in-person and remotely in Florida to exchange ideas, discuss together and learn more on High Energy/Nuclear/Particle Physics. The 7th ANPA2024 Conference would have a lot of responsibilities to shoulder especially covering a broad range of energy from perhaps KeV to TeV scales and I would like to express an early thanks to all the members, especially the members of High Energy/Nuclear/Particle Physics. The vision of ANPA is beyond just providing the platform, but also to inspire future generation of Nepali physicists all over the globe. I wish that the 7th ANPA2024 will be successful and enjoyable to all the participants and stimulate young High Energy/Nuclear/Particle Physicists to continue active work for the future physics. Let’s Physics!”
History and Future of accelerator development at Brookhaven National Lab
This talk gives a brief history on particle accelerators and Brookhaven Lab’s contributions to advances in the field of accelerator physics. It will then provide an overview of the Relativistic Heavy Ion Collider (RHIC) facility and the physics experiments that took place there. It will also discuss plans for the transition from RHIC to the Electron-Ion Collider (EIC).
Please look below for detailed schedule.
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Abstract Number: ANPA2024-N0006 Presenting Author: Devendra Raj Upadhyay Presenter's Affiliation: Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu, Nepal Title: Attenuation of Photons, Neutrons, and Heavy Ions in Niobium Alloys for Accelerator Applications Location: In-Person Presentation, CDP Show/Hide Abstract The present theoretical and simulation work investigates the attenuation properties of gamma-ray energies ranging from 1 keV to 100 GeV. Key parameters analyzed include linear and mass attenuation coefficients, half-value and tenth-value layers, mean free paths, and effective conductivity. These properties are examined in the context of increasing photon energy levels impacting accelerator cavities and conventional conducting materials. Additionally, fast neutron removal cross sections are studied using the photon shielding and dosimetry (Phy-X/PSD) software. Ion stopping potentials and projected ranges are analyzed using the Stopping and Range of Ions in Matter (SRIM) tool. Furthermore, we present findings on photon trajectories and dose attenuation using the particle and heavy ion transport code system (PHITS) in niobium and its alloys, which are considered as potential alternatives for cavity formation in accelerator physics. The use of niobium and its alloys could offer significant advantages in efficiency and effectiveness for accelerator applications.
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Abstract Number: ANPA2024-N00089 Presenting Author: Devi Lal Adhikari Presenter's Affiliation: Virginia Tech Title: Parity-Violating Electron Scattering as a Probe to Understand Fundamental Physics Location: In-Person Presentation, Fayetteville Show/Hide Abstract Parity is a discrete transformation that reverses the sign of a physical system’s spatial coordinates. It was long believed to be a universal symmetry until the mid-1950s, when it was found to be maximally violated in nuclear beta decay. Over the past three decades, the technique of parity-violating electron scattering (PVeS) has become increasingly precise. This technique involves measuring the asymmetry in the scattering of longitudinally polarized electrons off fixed targets. These asymmetries are sensitive to weak neutral current interactions, mediated by the Z boson, between electrons and quarks or between two electrons. This method provides a complementary approach to probing the limits of the electroweak theory, alongside direct searches for new physics at high energy scales in colliders. In this presentation, I will review the implications of the PVeS technique, highlight planned PVeS experiments for the next decade, and discuss how they will enhance our understanding of fundamental physics.
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Abstract Number: ANPA2024-N000101 Presenting Author: Chuyu Liu (Invited) Presenter's Affiliation: Brookhaven National Lab Title: History and Future of accelerator development at Brookhaven National Lab Location: Virtual Presentation Show/Hide Abstract This talk gives a brief history on particle accelerators and Brookhaven Lab's contributions to advances in the field of accelerator physics. It will then provide an overview of the Relativistic Heavy Ion Collider (RHIC) facility and the physics experiments that took place there. It will also discuss plans for the transition from RHIC to the Electron-Ion Collider (EIC).
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Abstract Number: ANPA2024-N000102 Presenting Author: Shruti Shrestha Presenter's Affiliation: Penn State Brandywine Title: High-Voltage Monolithic Active Pixel Sensors based tracker for the Mu3e Experiment Location: Virtual Presentation Show/Hide Abstract The search for lepton flavor violation in the charged lepton decay is highly sensitive to physics beyond the Standard Model (SM). Among the possible processes, μ-decays have the most significant discovery potential in most SM extensions. The Mu3e experiment is one of the dedicated experiments that searches for the charged lepton flavor violating decay μ^+→e^+ e^- e^+. It aimed at the sensitivity of one event in 10^16 μ-decays. To measure the momentum and vertex position of low momentum electrons (10-53 MeV/c) originating from this rare decay with high precision, a tracking detector built from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) has been implemented. The MuPix chip has HV-MAPS architecture. HV-MAPS is the technology of choice because the chip can be thinned to 50 μm. It has a high time resolution and is low cost. Furthermore, to reduce the material budget, the pixel readout electronics are embedded inside this sensor chip, supported by a low-mass mechanical structure built with 25 μm Kapton foil.
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Abstract Number: ANPA2024-N000103 Presenting Author: Bhawin Dhital Presenter's Affiliation: Brookhaven National Laboratory Title: Strong hadron cooling for the collider experiments Location: Virtual Presentation Show/Hide Abstract Strong hadron cooling, also known as hadron beam cooling, is a crucial technique in particle physics experiments, especially in the beam colliding experiments. It involves reducing the transverse and longitudinal momentum spread (emittance) of hadrons (such as protons or heavy ions) to increase the beam quality, which enhances the collision rate and precision of experimental results. Several methods are employed to achieve strong hadron cooling, each with specific applications and advantages. In this presentation, we will focus on electron cooling of hadron beam based on electron storage ring cooler.
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Abstract Number: ANPA2024-N000104 Presenting Author: Sushil Kumar Sedhai Presenter's Affiliation: Tribhuvan University Title: RADIATION SHIELDING PROPERTIES OF Ti-Cu-BASED BULK METALLIC GLASSES Location: Virtual Presentation Show/Hide Abstract In this work, we examined the radiation shielding characteristics of the Ti-Cu-based bulk metallic glasses system using online program Phy-X/PSD numerical simulation software. The shielding parameters of seven selected metallic glasses samples such as linear attenuation coefficient, mass attenuation coefficient, half value layer, tenth value layer, mean free path, effective charge state number, and fast neutron removal cross-section have been graphically presented and discussed. For the photon energies ranging from 0.015 to 15.0 MeV, the mass attenuation and linear attenuation coefficients both decrease with increasing photon energy. These calculations were performed using the online computation platforms NIST-XCOM and Phy-X/PSD. The glass sample S6 exhibits the highest linear and mass attenuation coefficients, whereas the glass sample S1 has the lowest coefficients of both. The half value layer (HVL), tenth value layer (TVL), and mean free path (MFP) were examined for all selected samples, and a similar trend of (HVL, TVL, MFP)S1 > (HVL, TVL, MFP) S2 > (HVL, TVL, MFP)S3 > (HVL, TVL, MFP)S5 > (HVL, TVL, MFP)S4 > (HVL, TVL, MFP)S7 > (HVL, TVL, MFP)S6 have been obtained. For several nuclear technology applications, the low half-value layer values and high mass attenuation coefficient values offer shielding advantages. Among the several Ti-Cu-based metallic glass systems that are now available, the glass sample S6 offers superior shielding properties. Additionally, we compared the mass attenuation coefficient of Phy-X/PSD with that of NIST-XCOM, and it is found that the results are numerically different by around 8.71% at lower photon energies, though they are qualitatively similar. Our preliminary research suggests that Ti-Cu-based bulk metallic glasses offer promising radiation shielding capabilities; however, further investigation will be needed to refine these materials and increase their usefulness for the nuclear and medical industries.
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