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36 results on '"Villarreal, Joshua A."'

1. The EPICS control system for IsoDAR

Author

Weigel, Philip, Busza, Monica, Namazov, Abutalib, Park, Janette, Villarreal, Joshua, Waites, Loyd H., and Winklehner, Daniel

Subjects
Physics - Instrumentation and Detectors
Abstract

Many large accelerator facilities have adopted the open-source EPICS software as the quasi-industry standard for control systems. They typically have access to their own electronics laboratory and dedicated personnel for control system development. On the other hand, small laboratories, many based at universities, use commercial software like LabView, or entirely homebrewed systems. These often become cumbersome when the number of controlled devices increases over time. Here we present a control system setup, based on a combination of EPICS, React Automation Studio, and our own drivers for electronics available to smaller laboratories -- such as Arduinos -- that is flexible, modular, and robust. It allows small laboratories, working with off-the-shelf modular electronics, power supplies, and other devices to quickly set up a control system without a large facility overhead, while retaining maximum compatibility and upgradeability. We demonstrate our setup for the MIST-1 ion source experiment at MIT. This control system will later be used to serve the entire IsoDAR accelerator complex and, as such, must be easily expandable.

Published
2023

2. Neural Networks as Effective Surrogate Models of Radio-Frequency Quadrupole Particle Accelerator Simulations

Author

Villarreal, Joshua, Winklehner, Daniel, Koser, Daniel, and Conrad, Janet Marie

Subjects
Physics - Computational Physics, Physics - Accelerator Physics
Abstract

Radio-Frequency Quadrupoles (RFQs) are multi-purpose linear particle accelerators that simultaneously bunch and accelerate charged particle beams. They are ubiquitous in accelerator physics, especially as injectors to higher-energy machines, owing to their impressive efficiency. The design and optimization of these devices can be lengthy due to the need to repeatedly perform high-fidelity simulations. Several recent papers have demonstrated that machine learning can be used to build surrogate models (fast-executing replacements of computationally costly beam simulations) for order-of-magnitude computing time speedups. However, while these pilot studies are encouraging, there is room to improve their predictive accuracy. Particularly, beam summary statistics such as emittances (an important figure of merit in particle accelerator physics) have historically been challenging to predict. For the first time, we present a surrogate model trained on 200,000 samples that yields <6% mean average percent error for the predictions of all relevant beam output parameters, solving the problem of poor emittance predictions by identifying and including hidden variables which were not accounted for previously. These surrogate models were made possible by using the Julia language and GPU computing; we briefly discuss both. We demonstrate the utility of surrogate modeling by performing a multi-objective optimization using our best model as a callback in the objective function to select an optimal RFQ design. We consider trade-offs in RFQ performance for various choices of Pareto-optimal design variables: common issues for any multi-objective optimization scheme. Lastly, we make recommendations for input data preparation, selection, and neural network architectures that pave the way for future development of production-capable surrogate models for RFQs and other particle accelerators.

Published
2022

3. Recent Progress in Solar Atmospheric Neutrino Searches with IceCube

Author

Villarreal, Joshua, Roellinghoff, Gerrit, and Lazar, Jeffrey

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

Cosmic-rays interacting with nucleons in the solar atmosphere produce a cascade of particles that give rise to a flux of high-energy neutrinos and gamma-rays. Fermi has observed this gamma-ray flux; however, the associated neutrino flux has escaped observation. In this contribution, we put forward two strategies to detect these neutrinos, which, if seen, would push forward our understanding of the solar atmosphere and provide a new testing ground of neutrino properties. First, we will extend the previous analysis, which used high-energy through-going muon events collected in the years of maximum solar activity and yielded only flux upper limits, to include data taken during the solar minimum from 2018 to 2020. Extending the analysis to the solar minimum is important as the gamma-ray data collected during past solar cycles indicates a possible enhancement in the high-energy neutrino flux. Second, we will incorporate sub-TeV events and include contributions from all neutrino flavors. These will improve our analysis sensitivity since the solar atmospheric spectrum is soft and, due to oscillation, contains significant contributions of all neutrino flavors. As we will present in this contribution, these complementary strategies yield a significant improvement in sensitivity, making substantial progress towards observing this flux., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021). See arXiv:2107.06966 for all IceCube contributions

Published
2021

5. Clozapine Intoxication Mimicking Acute Stroke

Author

Lebin, Jacob A., Villarreal, Joshua D., Chen, Betty C., and Hall, M. Kennedy

Abstract

Clozapine is an atypical antipsychotic drug prescribed for treatment-resistant schizophrenia. The risk of adverse hematologic, cardiovascular, and neurologic effects has tempered its use, and reports of overdoses remain rare. We report a case of accidental acute clozapine intoxication in a clozapine-naïve patient, who presented with symptoms mimicking acute stroke and later developed status epilepticus. Clozapine intoxication is a rare presentation in the emergency department with potential for iatrogenic harm if not correctly identified.

Published
2018

16. Evidence Versus Practice in Early Drain Removal After Pancreatectomy

Author

Villafane-Ferriol, Nicole, Baugh, Katherine A., McElhany, Amy L., Van Buren, George, II, Fang, Andrew, Tashakori, Erisha K., Reyes, Jose E. Mendez, Cao, Hop S. Tran, Silberfein, Eric J., Massarweh, Nader, Hsu, Cary, Barakat, Omar, Schmidt, Carl, Zyromski, Nicholas J., Dillhoff, Mary, Villarreal, Joshua A., and Fisher, William E.

Published
2019
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17. The EPICS control system for IsoDAR

Author

Weigel, Philip, primary, Busza, Monica, additional, Namazov, Abutalib, additional, Park, Janette, additional, Villarreal, Joshua, additional, Waites, Loyd H., additional, and Winklehner, Daniel, additional

Published
2023
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27. Recent Progress in Solar Atmospheric Neutrino Searches with IceCube

Author

IceCube Collaboration, Villarreal, Joshua, Alispach, Cyril Martin, Fienberg, Aaron, Filimonov, Kirill, Finley, Chad, Fischer, Leander, Fox, Derek B., Franckowiak, Anna, Friedman, Elizabeth, Fritz, Alexander, Fürst, Philipp, Gaisser, T. K., Alves Junior, Antonio Augusto, Gallagher, Jay, Ganster, Erik, Garcia, Alfonso, Garrappa, Simone, Gerhardt, L., Ghadimi, Ava, Glaser, Christian, Glauch, Theo, Glusenkamp, Thorsten, Goldschmidt, A., Amin, Najia Moureen Binte, Gonzalez, Javier, Goswami, Sreetama, Grant, Darren, Grégoire, Timothée, Griswold, Spencer, Gunduz, Mehmet, Günther, Christoph, Haack, Christian, Hallgren, Allan, Halliday, R., An, Rui, Halve, Lasse Yannik, Halzen, F., Ha Minh, Martin, Hanson, Kael, Hardin, John, Harnisch, Alexander A., Haungs, Andreas, Hauser, Simon, Hebecker, Dustin, Helbing, K., Andeen, Karen, Henningsen, Felix, Hettinger, Emma C., Hickford, Stephanie, Hignight, Joshua, Hill, Colton, Hill, G. C., Hoffman, Kara, Hoffmann, Ruth, Hoinka, Tobias, Hokanson-Fasig, Benjamin, Anderson, Tyler, Hoshina, K., Huang, Feifei, Huber, Matthias, Huber, Thomas, Hultqvist, Klas, Hunnefeld, Mirco, Hussain, Raamis, In, Seongjin, Iovine, Nadège, Ishihara, Aya, Anton, Gisela, Jansson, Matti, Japaridze, George, Jeong, Minjin, Jones, Ben, Kang, Donghwa, Kang, Woosik, Kang, Xinyue, Kappes, Alexander, Kappesser, David, Karg, Timo, Arguelles, Carlos, Karl, Martina, Karle, A., Katz, U., Kauer, M., Kellermann, Moritz, Kelley, J. L., Kheirandish, Ali, Kin, Ken'ichi, Kintscher, Thomas, Kiryluk, Joanna, Ashida, Yosuke, Klein, Spencer, Koirala, Ramesh, Kolanoski, Hermann, Kontrimas, Tomas, Kopke, Lutz, Kopper, Claudio, Kopper, Sandro, Koskinen, D. J., Koundal, Paras, Kovacevich, Michael, Axani, Spencer, Kowalski, Marek, Kozynets, Tetiana, Kun, Emma, Kurahashi, Naoko, Lad, Neha, Lagunas Gualda, Cristina, Lanfranchi, Justin, Larson, M. J., Lauber, Frederik Hermann, Lee, Jiwoong, Roellinghoff, Gerrit, Bai, Xinhua, Leonard, Kayla, Leszczyńska, Agnieszka, Li, Yijia, Lincetto, Massimiliano, Liu, Qinrui, Liubarska, Maria, Lohfink, Elisa, Lozano Mariscal, Cristian Jesus, Lu, Lu, Lucarelli, Francesco, Balagopal V., Aswathi, Ludwig, Andrew, Luszczak, William, Lyu, Yang, Ma, Wing Yan, Madsen, James, Mahn, Kendall, Makino, Yuya, Mancina, Sarah, Maris, Ioana Codrina, Maruyama, Reina H., Barbano, Anastasia Maria, Mase, K., McElroy, Thomas, McNally, Frank, Mead, James Vincent, Meagher, K., Medina, Andres, Meier, Maximilian, Meighen-Berger, Stephan, Micallef, Jessie, Mockler, Daniela, Barwick, S. W., Montaruli, Teresa, Moore, Roger, Morse, R., Moulai, Marjon, Naab, Richard, Nagai, Ryo, Naumann, Uwe, Necker, Jannis, Nguyen, Le Viet, Niederhausen, Hans, Bastian, Benjamin, Nisa, Mehr, Nowicki, Sarah, Nygren, Dave, Obertacke Pollmann, Anna, Oehler, Marie, Olivas, A., O'Sullivan, Erin, Pandya, Hershal, Pankova, Daria, Park, Nahee, Basu, Vedant, Parker, Grant, Paudel, Ek Narayan, Paul, Larissa, Perez de los Heros, Carlos, Peters, Lilly, Peterson, Josh, Philippen, Saskia, Pieloth, Damian, Pieper, Sarah, Pittermann, Martin, Baur, Sebastian, Pizzuto, A., Plum, M., Popovych, Yuiry, Porcelli, Alessio, Prado Rodriguez, Maria, Price, P. Buford, Pries, Brandom, Przybylski, Gerald, Raab, Christoph, Raissi, Amirreza, Bay, R. C., Rameez, Mohamed, Rawlins, K., Rea, Immacolata Carmen, Rehman, Abdul, Reichherzer, Patrick, Reimann, René, Renzi, Giovanni, Resconi, Elisa, Reusch, Simeon, Rhode, Wolfgang, Beatty, J. J., Richman, Mike, Riedel, Benedikt, Roberts, Ella, Robertson, Sally, Rongen, Martin, Rott, Carsten, Ruhe, Tim, Ryckbosch, Dirk, Rysewyk Cantu, Devyn, Safa, Ibrahim, Becker, K. H., Saffer, Julian, Sanchez Herrera, Sebastian, Sandrock, Alexander, Sandroos, Joakim, Santander, Marcos, Sarkar, Subir, Sarkar, Sourav, Satalecka, Konstancja, Scharf, Maximilian Karl, Schaufel, Merlin, Lazar, Jeffrey, Becker Tjus, Julia, Schieler, Harald, Schindler, Sebastian, Schlunder, P., Schmidt, Torsten, Schneider, Austin, Schneider, Judith, Schröder, Frank G., Schumacher, Lisa Johanna, Schwefer, Georg, Sclafani, Steve, Bellenghi, Chiara, Seckel, D., Seunarine, Surujhdeo, Sharma, Ankur, Shefali, Shefali, Silva, Manuel, Skrzypek, Barbara, Smithers, Ben, Snihur, Robert, Soedingrekso, Jan, Soldin, Dennis, BenZvi, Segev, Spannfellner, Christian, Spiczak, Glenn, Spiering, Christian, Stachurska, Juliana, Stamatikos, Michael, Stanev, T., Stein, Robert, Stettner, Jöran Benjamin, Steuer, A., Stezelberger, T., Berley, D., Sturwald, Timo, Stuttard, Thomas, Sullivan, G. W., Taboada, I., Tenholt, Frederik, Ter-Antonyan, Samvel, Tilav, S., Tischbein, Franziska, Tollefson, Kirsten, Tomankova, Lenka, Bernardini, Elisa, Tönnis, Christoph, Toscano, Simona, Tosi, Delia, Trettin, Alexander, Tselengidou, Maria, Tung, Chunfai, Turcati, Andrea, Turcotte, Roxanne, Turley, Colin, Twagirayezu, Jean Pierre, Besson, D. Z., Ty, Bunheng, Unland Elorrieta, Martin, Valtonen-Mattila, Nora, Vandenbroucke, Justin, van Eijndhoven, Nick, Vannerom, David, van Santen, Jakob, Verpoest, Stef, Vraeghe, Matthias, Walck, C., Binder, Gary, Watson, Timothyblake, Weaver, Chris, Weigel, Philip, Weindl, Andreas, Weiss, Matthew, Weldert, Jan, Wendt, Chris, Werthebach, Johannes, Weyrauch, Mark, Whitehorn, Nathan, Bindig, Daniel, Wiebusch, Christopher, Williams, Dawn, Wolf, Martin, Woschnagg, Kurt, Wrede, Gerrit, Wulff, Johan, Xu, Xianwu, Xu, Yiqian, Yanez, Juan Pablo, Yoshida, S., Blaufuss, E., Yu, Shiqi, Yuan, Tianlu, Zhang, Zelong, Blot, Summer, Abbasi, Rasha, Boddenberg, Matthias, Bontempo, Federico, Borowka, Jürgen, Boser, S., Botner, Olga, Böttcher, Jakob, Bourbeau, Etienne, Bradascio, Federica, Braun, J., Bron, Stephanie, Ackermann, Markus, Brostean-Kaiser, Jannes, Browne, Sally-Ann, Burgman, Alexander, Burley, Ryan, Busse, Raffaela, Campana, Michael, Carnie-Bronca, Erin, Chen, Chujie, Chirkin, Dmitry, Choi, Koun, Adams, Jenni, Clark, Brian, Clark, Kenneth, Classen, Lew, Coleman, Alan, Collin, Gabriel, Conrad, J. M., Coppin, Paul, Correa, Pablo, Cowen, D. F., Cross, R., Aguilar, Juanan, Dappen, Christian, Dave, Pranav, DE CLERCQ, Catherine, DeLaunay, James, Dembinski, Hans, Deoskar, Kunal, De Ridder, Sam, Desai, Abhishek, Desiati, Paolo, de Vries, Krijn, Ahlers, M., de Wasseige, Gwenhaël, De With, Meike, DeYoung, Tyce, Dharani, Sukeerthi, Diaz, Alejandro, Diaz-Velez, Juan Carlos, Dittmer, Markus, Dujmovic, Hrvoje, Dunkman, Matt, DuVernois, Michael, Ahrens, Maryon, Dvorak, Emily, Ehrhardt, Thomas, Eller, Philipp, Engel, Ralph, Erpenbeck, Hannah, Evans, John, Evenson, P. A., Fan, Kwok Lung, Fazely, A. R., and Fiedlschuster, Sebastian

Subjects
interaction [cosmic radiation], neutrino: energy: high, Astrophysics::High Energy Astrophysical Phenomena, Flux, Astrophysics, cosmic radiation: interaction, neutrino: flux, IceCube, muon, flux [gamma ray], upper limit [flux], flux: upper limit, ddc:530, gamma ray: flux, energy: high [neutrino], enhancement, Physics, Muon, Oscillation, nucleon, flavor [neutrino], flux [neutrino], oscillation, sensitivity, solar, cascade, Maxima and minima, Cascade, neutrino: flavor, atmosphere, High Energy Physics::Experiment, Neutrino, Nucleon, Fermi Gamma-ray Space Telescope
Abstract

37th International Cosmic Ray Conference, ICRC 2021, Berlin, Germany, 15 Jul 2021 - 22 Jul 2021; Proceedings of Science 395, 1174 (2022). doi:10.22323/1.395.1174 special issue: "37th International Cosmic Ray Conference : ICRC2021 : 12-23 July 2021 : Berlin, Germany - Online / Editorial Board: Alexander Kappes, Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany ; Bianca Keilhauer, Karlsruhe Institute of Technology, Institute for Astroparticle Physics (IAP)", Published by SISSA, Trieste

Published
2021
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30. Intraoperative blood loss and transfusion during primary pediatric liver transplantation: A single‐center experience

Author

Villarreal, Joshua A., primary, Yoeli, Dor, additional, Ackah, Ruth L., additional, Sigireddi, Rohini R., additional, Yoeli, Jordan K., additional, Kueht, Michael L., additional, Galvan, N Thao N., additional, Cotton, Ronald T., additional, Rana, Abbas, additional, O’Mahony, Christine A., additional, and Goss, John A., additional

Published
2019
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35. Intraoperative blood loss and transfusion during primary pediatric liver transplantation: A single‐center experience.

Author

Sigireddi, Rohini R., Villarreal, Joshua A., Kueht, Michael L., Galvan, N Thao N., Cotton, Ronald T., Rana, Abbas, O'Mahony, Christine A., Goss, John A., Yoeli, Dor, Yoeli, Jordan K., and Ackah, Ruth L.

Subjects
*LIVER transplantation, *BLOOD transfusion, *BLOOD loss estimation, *DISEASE risk factors
Abstract

Children undergoing liver transplantation are at a significant risk for intraoperative hemorrhage and thrombotic complications, we aim to identify novel risk factors for massive intraoperative blood loss and transfusion in PLT recipients and describe its impact on graft survival and hospital LOS. We reviewed all primary PLTs performed at our institution between September 2007 and September 2016. Data are presented as n (%) or median (interquartile range). EBL was standardized by weight. Massive EBL and MT were defined as greater than the 85th percentile of the cohort. 250 transplantations were performed during the study period. 38 (15%) recipients had massive EBL, and LOS was 31.5 (15‐58) days compared to 11 (7‐21) days among those without massive EBL (P < 0.001). MT median LOS was 34 (14‐59) days compared to 11 (7‐21) days among those without MT (P = 0.001). Upon backward stepwise regression, technical variant graft, operative time, and transfusion of FFP, platelet, and/or cryoprecipitate were significant independent risk factors for massive EBL and MT, while admission from home was a protective factor. Recipient weight was a significant independent risk factor for MT alone. Massive EBL and MT were not statistically significant for overall graft survival. MT was, however, a significant risk factor for 30‐day graft loss. PLT recipients with massive EBL or MT had significantly longer LOS and increased 30‐day graft loss in patients who required MT. We identified longer operative time and technical variant graft were significant independent risk factors for massive EBL and MT, while being admitted from home was a protective factor. [ABSTRACT FROM AUTHOR]

Published
2019
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