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The Colorado River Upper Initial Units Take Center Stage, Eric Kuhn, Anne Castle, Jack Schmidt, Kathryn Sorensen, Katherine Tara Oct 2026

The Colorado River Upper Initial Units Take Center Stage, Eric Kuhn, Anne Castle, Jack Schmidt, Kathryn Sorensen, Katherine Tara

The Traveling Wilburys of the Colorado River

In 1956, Congress authorized the Upper Initial Units—Flaming Gorge Reservoir,

Navajo Reservoir, and the Aspinall Unit (UIUs)—for a variety of water use

purposes in the Upper Colorado River Basin, including compliance with the

1922 Colorado River Compact (1922 Compact). The historical record is clear

that the primary reason these reservoirs exist is to satisfy the math of the 1922

Compact and the obligations it imposed on the Upper Division States

regarding flows at Lee Ferry.


New Mexico Health Care Workforce Committee 2026 Annual Report, University Of New Mexico - Health Sciences Center Oct 2026

New Mexico Health Care Workforce Committee 2026 Annual Report, University Of New Mexico - Health Sciences Center

New Mexico Health Care Workforce Committee (2013-ongoing)

No abstract provided.


From Disaster To Resilience: Developing Smart Settlements In The Himalayas, Keshav Bhattarai, Ambika P. Adhikari Sep 2026

From Disaster To Resilience: Developing Smart Settlements In The Himalayas, Keshav Bhattarai, Ambika P. Adhikari

Himalayan Research Papers Archive

Nepal’s catastrophic 26 August 2026 Bhote Koshi–Trishuli flood should be understood not only as a humanitarian tragedy but also as a potentially major turning point in updating national settlement and reconstruction policy. Engineers and scientists have described the floods as a glacier–bedrock collapse that triggered an ice-rock avalanche and debris flow. As per the live updates on September 7, 2026, the total death toll was 1,355, and 4,996 people were missing (The Hindu, 2026). Indian and Nepali rescuers worked urgently to locate and rescue people buried under hydropower tunnels, buildings, mud, and landslide debris.

UN News reported on September 3, …


From Himalayan Catastrophe To National Resilience: Lessons From The 2026 Bhote Koshi And Trishuli River Floods In Nepal, Keshav Bhattarai, Ambika P. Adhikari Sep 2026

From Himalayan Catastrophe To National Resilience: Lessons From The 2026 Bhote Koshi And Trishuli River Floods In Nepal, Keshav Bhattarai, Ambika P. Adhikari

Himalayan Research Papers Archive

On the morning of 26 August 2026, the mountains above Nepal’s northern frontier delivered a disaster of almost unimaginable speed and scale. A massive mass of ice, rock, and sediment detached in the high Himalayan terrain near the Nepal–Tibet border, descended roughly 1,200 metres, interacted with the Lhende Khola system, and generated a debris-rich flood that surged through the Bhote Koshi and Trishuli river corridors, destroying settlements, markets, roads, bridges, hydropower facilities, and an international border crossing and transforming them into fields of mud, boulders, and wreckage within minutes (ICIMOD, 2026b; Reuters, 2026a). Satellite analysis indicates that a substantial section …


The Colorado River Water Supply Crisis In A Few Graphs: Part 2 Agricultural Water Use In The Lower Basin, Jack Schmidt, Anne Castle, Eric Kuhn, Kathryn Sorensen, Katherine Tara Sep 2026

The Colorado River Water Supply Crisis In A Few Graphs: Part 2 Agricultural Water Use In The Lower Basin, Jack Schmidt, Anne Castle, Eric Kuhn, Kathryn Sorensen, Katherine Tara

The Traveling Wilburys of the Colorado River

Reductions in Lower Basin water use during the last four years, including

forecast use in 2026, are similar to the initial targets for Lower Basin shortages

described in the Final Environmental Impact Statement for Post-2026

Operational Guidelines and Strategies for Lake Powell and Lake Mead (FEIS)

and the accompanying Record of Decision (ROD).

6 Lower Basin consumptive

use in 2023, 2024, and 2025, and forecast for 2026 has been the smallest for

the entire 2010-2026 period. These four years of smallest use are between 1.4

and 1.7 million acre feet/year (maf/yr) less than the 7.50 maf/yr amount

generally recognized as …


2026-08 August Newsletter, Sammi Williams Sep 2026

2026-08 August Newsletter, Sammi Williams

NMOER Newsletters

No abstract provided.


Sexual Education And Sti Prevention In High School: A Neutrosophic Analysis Of The Opportunities And Risks Of Generative Artificial Intelligence, Antonio Pioquinto Rivera, Gregorio Nunez Hernandez, Rosalinda Villa Juarez Sep 2026

Sexual Education And Sti Prevention In High School: A Neutrosophic Analysis Of The Opportunities And Risks Of Generative Artificial Intelligence, Antonio Pioquinto Rivera, Gregorio Nunez Hernandez, Rosalinda Villa Juarez

Neutrosophic Sets and Systems

Sexually transmitted infections (STIs) remain a critical challenge during adolescence. Given the limitations of traditional sex education, generative artificial intelligence (GAI) has emerged as a personalized and anonymous consultation alternative. This study analyzes, from a neutrosophic perspective, the scientific evidence published between 2019 and 2026 on the use of GAI to strengthen STI prevention among high school students. Through a critical integrative review of thirteen reference studies, a matrix was built that classifies the findings across four dimensions (AI-mediated learning, sexual education, STI prevention, and educational equity) according to their truth (T), falsity (F), and indeterminacy (I) components. The results …


Beyond National Accuracy: A Neutrosophic Geographic Evidence Audit Of Preschool-Attendance Prediction In Ecuador (Ensanut 2018), Cindy Patricia Campoverde Vera Sep 2026

Beyond National Accuracy: A Neutrosophic Geographic Evidence Audit Of Preschool-Attendance Prediction In Ecuador (Ensanut 2018), Cindy Patricia Campoverde Vera

Neutrosophic Sets and Systems

Predictive models built on national surveys are usually summarized by one aggregate performance figure, yet a national metric may conceal large differences in how the model behaves across territories. We examined this problem with the 2018 Ecuadorian National Health and Nutrition Survey (ENSANUT 2018). A conventional Random Forest trained on five child and household variables reached a national accuracy of 64.83% against a majority-class baseline of 54.40%. This aggregate concealed substantial geographic heterogeneity: provincial accuracy ranged from 56.1% (Bolivar) to 78.0% (Canar). To represent this evidence without collapsing it into one number we formalize a Neutrosophic Geographic Evidence Audit (NGEA), …


Beyond Scalar Uncertainty: Independent Neutrosophic Evidence Coordinates For Conflict-Aware Retrieval-Augmented Generation, Florentin Smarandache, Maikel Yelandi Leyva Vazquez Sep 2026

Beyond Scalar Uncertainty: Independent Neutrosophic Evidence Coordinates For Conflict-Aware Retrieval-Augmented Generation, Florentin Smarandache, Maikel Yelandi Leyva Vazquez

Neutrosophic Sets and Systems

Retrieval-augmented generation (RAG) pipelines reduce the quality of retrieved evidence to one number, and common scalar uncertainty summaries conflate evidential distinctions that a three-coordinate representation keeps apart: insufficient, contradictory and explicitly indeterminate evidence. We use the non-normalized neutrosophic triple (T, I, F) as a testable multidimensional evidence representation, with independent channels for support, explicit indeterminacy and opposition, and subject its defining design principle to a controlled empirical test on a pre-specified battery built on Climate-FEVER, validated externally on ConfRAG. The independent triple gives the best five-way behaviour with the LLM evaluator; normalization deletes the magnitude that signals insufficiency. The benefit …


Neutrosophic Multi-Criteria Assessment Of The Structural Performance Of Finger-Jointed Glued Laminated Timber From Five Tropical Wood Species, Maria Angelica Flores-Romayna, Victor Augusto Araujo-Abanto, David Leon-Moreno, Lenin Vladimir Vargas-Villa, Guillermo Augusto Pastor-Picon, Noe Cristian Fachin-Vargas Sep 2026

Neutrosophic Multi-Criteria Assessment Of The Structural Performance Of Finger-Jointed Glued Laminated Timber From Five Tropical Wood Species, Maria Angelica Flores-Romayna, Victor Augusto Araujo-Abanto, David Leon-Moreno, Lenin Vladimir Vargas-Villa, Guillermo Augusto Pastor-Picon, Noe Cristian Fachin-Vargas

Neutrosophic Sets and Systems

Previous studies on finger-jointed glued laminated timber typically compare mechanical properties in isolation through classical statistical tests, which limits the ability to answer a question of greater relevance for structural design: which species most consistently retains its mechanical performance under experimental uncertainty and contradictory behavior across indicators. This study comparatively assessed the structural performance of finger-jointed glued laminated timber from five tropical forest species by integrating physical-mechanical indicators, inferential statistics and a neutrosophic CRITIC-TOPSIS multi-criteria model. The CRITIC-TOPSIS model ranked moena itauba and tornillo with the highest structural aptitude under uncertainty, results confirmed as reasonably robust by a sensitivity analysis …


Field-Deployable Pose Estimation For Youth Athlete Screening: A Reproducible Protocol And Its Sensitivity Limits In A Genetically Controlled Case Series, Darvin Manuel Ramirez Guerra, Christian Edison De La Torre Choque, Jorge Guiseppe Herrera Chamorro, Jordi Kevin Flores Zabaleta Sep 2026

Field-Deployable Pose Estimation For Youth Athlete Screening: A Reproducible Protocol And Its Sensitivity Limits In A Genetically Controlled Case Series, Darvin Manuel Ramirez Guerra, Christian Edison De La Torre Choque, Jorge Guiseppe Herrera Chamorro, Jordi Kevin Flores Zabaleta

Neutrosophic Sets and Systems

Smartphone pose-estimation applications promise laboratory-grade biomechanical screening at negligible cost, an attractive prospect for youth sport programmes in low-resource settings. This paper contributes a reproducible field protocol for smartphone-based postural and jump screening, and reports its behaviour on a deliberately adversarial test case: a set of sex-discordant triplets (n = 3, age 13 years) who share prenatal environment, socioeconomic context and training history. The contribution is the protocol, the fully reported case data, and an explicit statement of what a criterion-validation study against force platforms and open pose estimators would need to establish before field screening claims can be sustained.


The Gap Between Fixed And Mobile Internet Accounts In Ecuador (2010-2022): A Linear Regression Model To Characterize And Project Its Evolution, Edison Mauricio Mosquera Simbana, Victor Manuel Tapia Casa, Rommel Eduardo Ronquillo Carangui Sep 2026

The Gap Between Fixed And Mobile Internet Accounts In Ecuador (2010-2022): A Linear Regression Model To Characterize And Project Its Evolution, Edison Mauricio Mosquera Simbana, Victor Manuel Tapia Casa, Rommel Eduardo Ronquillo Carangui

Neutrosophic Sets and Systems

Since 2010, internet access in Ecuador has grown in markedly different ways depending on the service modality: whereas mobile accounts multiplied, fixed accounts advanced at a far more restrained pace. This article analyzes the dated observations of fixed and mobile internet accounts published by the Telecommunications Regulation and Control Agency (ARCOTEL) between December 2010 and June 2022. The fixed-account model proved almost perfect (R2 = 0.995); the mobile-account model displayed greater unexplained variability (R2 = 0.901). As a complementary layer, a neutrosophic framework (truth/indeterminacy/falsity) is applied to the consistency of the figures across sources.


Neutrosophic Sets And Systems, Vol. 101, 2026, Proceedings Of The International Conference On Artificial Intelligence, Indeterminacy, And Education, University O'Higgns, Santiago, Chile, Florentin Smarandache Sep 2026

Neutrosophic Sets And Systems, Vol. 101, 2026, Proceedings Of The International Conference On Artificial Intelligence, Indeterminacy, And Education, University O'Higgns, Santiago, Chile, Florentin Smarandache

Neutrosophic Sets and Systems

No abstract provided.


Concepts For Supporting Indigenous And Tribal Information And Research Needs, Sharon Hausam Aug 2026

Concepts For Supporting Indigenous And Tribal Information And Research Needs, Sharon Hausam

Faculty Publications

This is a working paper produced as part of National Science Foundation project #2115169, “Transforming Rural-Urban Systems: Trajectories for Sustainability in the Intermountain West,” known as the “Intermountain West Transformation Network” (TN), led by the University of New Mexico with institutional partners at three additional universities in New Mexico, two in Arizona, and one each in Utah, Colorado, and Washington. The TN’s Indigenous and Tribal engagement was supported through a contract with Dr. Sharon Hausam, additional work by Aaron M. Canter, coordination with Dr. Lani Tsinnajinnie, and an Advisory Committee on Indigenous Information Needs primarily comprised of Indigenous representatives in …


Mountain Development In Nepal: Settlements, Infrastructure, And Economic Transformation, Keshav Bhattarai, Ambika P. Adhikari Aug 2026

Mountain Development In Nepal: Settlements, Infrastructure, And Economic Transformation, Keshav Bhattarai, Ambika P. Adhikari

Himalayan Research Papers Archive

As Nepal urbanizes, expands infrastructure, strengthens local governments, and explores deeper connectivity with India and China, climate change is increasing floods, landslides, heat, and water insecurity. Rapid internal migration, rising disaster risks, youth outmigration, and dependence on remittances are also revealing the limits of conventional urban development, especially in the mountainous region. The central challenge for Nepal is no longer just to accommodate growing towns and cities, but to build settlements that are safe, productive, environmentally resilient, and capable of sustaining long-term prosperity.

This paper argues that Nepal's urban future must be guided by a new development paradigm centered on …


Lessons From Tanzania’S Ujamaa For Smart Settlements In Nepal: Social Justice And Economic Development, Keshav Bhattarai, Ambika P. Adhikari Aug 2026

Lessons From Tanzania’S Ujamaa For Smart Settlements In Nepal: Social Justice And Economic Development, Keshav Bhattarai, Ambika P. Adhikari

Himalayan Research Papers Archive

Nepal’s constitutional commitment to a “socialism-oriented” state places social justice, equitable access to resources and housing, and protection of marginalized populations at the center of national development discourse. However, persistent landlessness, informal settlements, unemployment, youth outmigration, and unequal access to infrastructure reveal a significant gap between constitutional aspirations and socioeconomic realities.

This article examines lessons Nepal can draw from Tanzania’s experience with Ujamaa, the African socialist development model initiated by President Nyerere in 1967. Using comparative policy analysis, published research, official documents, and exploratory field observations from selected Tanzanian locations, including the capital and villages in the Iringa Region, the …


Unm Pathology, Pathfinder Summer 2026, Unm Department Of Pathology Aug 2026

Unm Pathology, Pathfinder Summer 2026, Unm Department Of Pathology

Newsletters

No abstract provided.


Indigenous Community Research Opportunities, Sharon Hausam, Aaron M. Canter Aug 2026

Indigenous Community Research Opportunities, Sharon Hausam, Aaron M. Canter

Faculty Publications

This is a working paper produced as part of National Science Foundation project #2115169, “Transforming Rural-Urban Systems: Trajectories for Sustainability in the Intermountain West,” known as the “Intermountain West Transformation Network” (TN), led by the University of New Mexico with institutional partners at three additional universities in New Mexico, two in Arizona, and one each in Utah, Colorado, and Washington. The TN’s Indigenous and Tribal engagement was supported through a contract with Dr. Sharon Hausam, additional work by Aaron M. Canter, coordination with Dr. Lani Tsinnajinnie, and an Advisory Committee on Indigenous Information Needs primarily comprised of Indigenous representatives in …


Opportunities For Leadership In Indigenous And Tribally Engaged Research At The University Of New Mexico, Sharon Hausam Aug 2026

Opportunities For Leadership In Indigenous And Tribally Engaged Research At The University Of New Mexico, Sharon Hausam

Faculty Publications

This is a working paper produced as part of National Science Foundation project #2115169, “Transforming Rural-Urban Systems: Trajectories for Sustainability in the Intermountain West,” known as the “Intermountain West Transformation Network” (TN), led by the University of New Mexico with institutional partners at three additional universities in New Mexico, two in Arizona, and one each in Utah, Colorado, and Washington. The TN’s Indigenous and Tribal engagement was supported through a contract with Dr. Sharon Hausam, additional work by Aaron M. Canter, coordination with Dr. Lani Tsinnajinnie, and an Advisory Committee on Indigenous Information Needs primarily comprised of Indigenous representatives in …


Examples And Evaluation Of Sustainability Research With Tribes, Aaron M. Canter, Sharon Hausam Aug 2026

Examples And Evaluation Of Sustainability Research With Tribes, Aaron M. Canter, Sharon Hausam

Faculty Publications

This is a working paper produced as part of National Science Foundation project #2115169, “Transforming Rural-Urban Systems: Trajectories for Sustainability in the Intermountain West,” known as the “Intermountain West Transformation Network” (TN), led by the University of New Mexico with institutional partners at three additional universities in New Mexico, two in Arizona, and one each in Utah, Colorado, and Washington. The TN’s Indigenous and Tribal engagement was supported through a contract with Dr. Sharon Hausam, additional work by Aaron M. Canter, coordination with Dr. Lani Tsinnajinnie, and an Advisory Committee on Indigenous Information Needs primarily comprised of Indigenous representatives in …


Increasing Postpartum Appointment Attendance Rates, Tanya Lister Jul 2026

Increasing Postpartum Appointment Attendance Rates, Tanya Lister

Doctor of Nursing Practice Scholarly Projects

Background: Postpartum visits provide an opportunity to detect and address potential complications, monitor healing and recovery, and offer guidance and support during the transition into motherhood. Current research shows that appointment reminders increase healthcare appointment attendance rates, whether delivered via text messages or phone calls.

Purpose: The purpose of this academic project was to plan, implement, and evaluate a process change within a single health facility to increase postpartum visit attendance rates.

Methods: This evidence-based scholarly project used telephone calls to remind patients scheduled for postpartum visits of their appointment dates and times. Appointment reminder phone calls were completed the …


Using Temporal Genomic Data To Uncover Patterns Of Genetic Diversity And Signatures Of Selection For Management Of A Threatened Minnow Species, Erika A. Dunn Jul 2026

Using Temporal Genomic Data To Uncover Patterns Of Genetic Diversity And Signatures Of Selection For Management Of A Threatened Minnow Species, Erika A. Dunn

Biology ETDs

The Little Colorado River (LCR) spinedace persists only in three isolated watersheds within the LCR Basin in Arizona. This imperiled minnow faces ongoing pressure from habitat alteration, climatic shifts, and invasive non-native predators. Over the past two decades, managers have translocated spinedace within watersheds to increase abundance and expand habitat occupancy. We sequenced a reference genome and analyzed single nucleotide polymorphisms (SNPs) from 475 individuals over their geographic range. DNA samples were obtained from a previous study in the mid-1990s and compared with samples from 2024 and 2025, allowing us to track genetic diversity, effective population size, population structure, and …


Finding Fish Families: Movement And Demography Of Loach Minnow (Tiaroga Cobitis) Inferred From Gt-Seq-Enabled Kinship Analysis, Patrick C. Baca Jul 2026

Finding Fish Families: Movement And Demography Of Loach Minnow (Tiaroga Cobitis) Inferred From Gt-Seq-Enabled Kinship Analysis, Patrick C. Baca

Biology ETDs

River fragmentation poses major threats to freshwater biodiversity by reducing connectivity and limiting persistence of imperiled desert fishes. Connectivity in streams is impaired by anthropogenic changes, including road crossings, prompting the installation of engineered fish passage structures at low-water road crossings and raising questions about the dispersal of aquatic species across these structures. This thesis investigates the movement of the threatened Loach Minnow (Tiaroga cobitis) by applying a close-kin mark-recapture (CKMR) framework in a restored stream (including a fish passage) and a stream without rehabilitation efforts. We developed and optimized a GT-seq panel for relatedness analysis and used it to …


Naturalistic Aided Language Intervention For Children Who Have Multiple Disabilities Including Visual Impairment, Naomi Nattress Jul 2026

Naturalistic Aided Language Intervention For Children Who Have Multiple Disabilities Including Visual Impairment, Naomi Nattress

Speech and Hearing Sciences ETDs

ABSTRACT

This dissertation examined aided AAC interventions for individuals with multiple disabilities, including visual impairment, across three original studies. Chapter 2, a meta-analysis, found limited rigorous research for this population while showing that individuals at early symbolic stages with diverse visual profiles can successfully engage with AAC when appropriate adaptations are provided. The pilot study in Chapter 3 indicated that caregivers and graduate student clinicians can learn and implement naturalistic AAC techniques and VI accommodations with high fidelity through structured coaching. The mixed methods study in Chapter 4 introduced the ImPAACT-VI program, showing strong outcomes in educator performance, students’ symbolic …


Recovery Through Connection: The Role Of Positive Social Interactions In Early Alcohol And Opioid Recovery Outcomes, Hannah Avery Carlon Jul 2026

Recovery Through Connection: The Role Of Positive Social Interactions In Early Alcohol And Opioid Recovery Outcomes, Hannah Avery Carlon

Psychology ETDs

Recovery from substance use disorder (SUD) is influenced by both positive emotional functioning and social connectedness. However, empirical research has yet to examine how these two protective factors interact to influence recovery. The present study aimed to address this gap by exploring positivity resonance, or the shared experience of positive emotions, in the first year of recovery. In Aim 1, we examined change trajectories of positivity resonance and recovery capital over the first year of recovery among adults with alcohol use disorder (AUD; n=470) and opioid use disorder (OUD; n=61), the associations between these change trajectories (1a), and …


Understanding The Long-Run Effect Of Historical Redlining Practices, Yujian Lu Jul 2026

Understanding The Long-Run Effect Of Historical Redlining Practices, Yujian Lu

Geography ETDs

Historical redlining practices initiated by Home Owners’ Loan Corporation (HOLC) in the 1930s have produced enduring persistent socioeconomic and environmental disparities in U.S. cities. This dissertation examines their long-term impacts on social vulnerability, urban flood risk, along with public discourse about redlining practices. Results indicate that neighborhoods with HOLC grade A (greenlined) exhibit the lowest overall social vulnerability, while those graded D (redlined) face the highest across U.S. cities. In Chicago, associations between redlining practices and flood risk disparities are stronger than in Los Angeles, reflecting place-specific characteristics among environmental, socioeconomic, and demographic factors shaping flood risk disparities in long …


How Forest Structure And Climate Influence Snowpack For Water Resources In The Southwestern United States, Lindsey L. Rotche Jul 2026

How Forest Structure And Climate Influence Snowpack For Water Resources In The Southwestern United States, Lindsey L. Rotche

Geography ETDs

Climate change, declining snowpack, and increasing wildfire risk have profound impacts on water availability in the southwestern United States. Because the southwestern United States is a global hotspot for freshwater vulnerability, and snowpack provides much of the region’s freshwater, understanding how climate and forest structure influence snowpack dynamics is increasingly important. In this dissertation I aim to better understand and communicate these dynamics through empirical data collection and the development of a simple vegetation driven temperature-index snow model: SNOW-17(VEG). I then implement the model at a watershed scale using remotely sensed imagery to create vegetation zones and climate simulations to …


Reading The Martian Surface: Impact Crater Distributions And Geochemical Signatures In Gale Crater As Recorded By The Curiosity Rover, Megan E. Hoffman Jul 2026

Reading The Martian Surface: Impact Crater Distributions And Geochemical Signatures In Gale Crater As Recorded By The Curiosity Rover, Megan E. Hoffman

Earth and Planetary Sciences ETDs

The Curiosity rover has been exploring Gale crater, a large impact basin near the Mars equator since 2012. This mission has greatly improved our ability to explore the surface of Mars with a suite of geologic tools and cameras and has revealed that Mars likely once resembled present-day Earth. In this dissertation, I utilize measurements and data taken by Curiosity to analyze the distribution and preservation of small impact craters at meter scales, I quantify the formation characteristics of a small impact crater cluster, and I examine the presence of barium in a geologic unit with high-Si to constrain sediment …


Transforming Faculty Development: Organizational Citizenship Behavior, Arts-Based Design, And Communities Of Transformation In Stem Education, Kristen L. Ferris Jul 2026

Transforming Faculty Development: Organizational Citizenship Behavior, Arts-Based Design, And Communities Of Transformation In Stem Education, Kristen L. Ferris

Organization, Information and Learning Sciences ETDs

This dissertation investigates the relational conditions enabling institutional transformation and diversity, equity, inclusion, and justice (DEIJ) within STEM higher education. Despite needs for systemic change, sustaining faculty engagement remains difficult due to entrenched power dynamics, lack of pedagogical training, and political repression. To address these barriers this research introduces Organizational Citizenship Behaviors (OCB) as an analytic lens and functional infrastructure for change.

Through three papers, this study 1) establishes OCB via a systemic literature review as an actionable metric for faculty development; 2) details the design of a cross-institutional Community of Transformation (CoT) as a design case; and 3) Presents …


3d Electromagnetic Simulations Of A 1.6 Cell S-Band Photoinjector: Emittance Studies For Electron Microscopy, Trudy Bolin Jul 2026

3d Electromagnetic Simulations Of A 1.6 Cell S-Band Photoinjector: Emittance Studies For Electron Microscopy, Trudy Bolin

Electrical and Computer Engineering ETDs

Modern beam-based materials research demands electron sources with increasingly precise time resolution, high brightness, and stability. For example, there are various instruments across the U.S. dedicated to ultrafast electron diffraction (UED), but fewer are dedicated to ultrafast electron microscopy (UEM), which demands beam stability. Modeling femtosecond electron bunches with ultra-low emittance < 50 nm-rad inside a 1.6-cell S-band (2856 MHz) rf photoinjector with full 3D electromagnetic simulations can require high-performance computing (HPC) environments due to the scale disparity between the macroscopic cavity geometry and the femtosecond-scale bunch kinematics. To enable optimization in a desktop computing environment, this work presents a streamlined 3D electromagnetic Particle-in-Cell (PIC) simulation framework optimized for 400-femtosecond bunch regimes. The covariance method was employed to study emittance properties for electron bunch counts ranging from thousands to millions and has successfully resolved highly transient, pure rf phase-space rotations, such as a localized energy-spread minimum occurring at the gun exit iris. To overcome the computational cost of these simulations, a machine-learning-based Bayesian optimization approach was deployed to construct multi-objective Pareto fronts from sparse datasets. Because the simulation software is scalable from desktop to HPC facilities, the framework is ready for experiments at the National Energy Research Scientific Computing Center (NERSC) at Lawrence Berkeley National Laboratory (LBNL).