THEORY SEMINAR - GUOXING WANG - SEPT. 18
On Monday, Sept. 18 at 1 p.m., Guoxing Wang of Laboratoire de Physique Théorique et Hautes Energies will present “Next-to-Leading Power Resummed Rapidity Distributions Near Threshold for Drell-Yan and Diphoton Production” in this installment of the Theory Seminar series on Zoom.
Abstract: Recently, we consider Drell-Yan production and QCD-induced diphoton production and compute their rapidity distributions up to next-to-leading power (NLP) in the threshold variable. We give results for rapidity distributions of the Drell-Yan process up to next-to-next-to-leading-order accuracy and show that a factorized structure occurs for the leading logarithms (LL) at NLP, generalizing the result at leading power. For diphoton production, we generalize methods based on kinematical shifts to find the next-to-leading order cross-section up to NLP for rapidity distributions. From the results for these two processes, we derive resummed cross-sections at NLP LL accuracy that are double differential in the threshold variable and the rapidity variable, which generalize results for single differential resummed cross-sections. In this talk, I will first give a short review about the calculation of the cross-section and the threshold resummation, and then focus on our new results at NLP for Drell-Yan and diphoton production process.
ACCELERATING MARKOV CHAIN MONTE CARLO SAMPLING WITH DIFFUSION MODELS
Global fits of physics models require efficient methods for exploring high-dimensional and multimodal posterior functions. A new paper proposes a novel method for accelerating Markov Chain Monte Carlo sampling by pairing a Metropolis-Hastings algorithm with a diffusion model that can draw global samples with the aim of approximating the posterior. This approach leads to a significant reduction in the number of likelihood evaluations required to obtain an accurate representation of the Bayesian posterior across several analytic functions, as well as for a physical example based on a global analysis of parton distribution functions.
TODAY: SCIENCE WITH A SIDE OF SUDS - SEPT. 13
Join the lab on Wednesday, Sept. 13 at 6 p.m., for “Accelerating Medical Care: How Particle Accelerators Are Changing Medical Diagnosis and Treatment” at Coastal Fermentory in Newport News. A portion of all sales will go to Here for the Girls, a nonprofit improving the lives of young women affected by breast cancer. The event is free and open to the public. Everyone is welcome to attend! For questions, contact Anita Seay.
Moderated by Jefferson Lab’s own Todd Satogata, this edition of Scientist Walks Into a Bar will include speakers covering the latest insights and breakthroughs in the use of accelerators in medicine with accessible, non-technical language:
- Shane Koscielniak, TRIUMF: “Compact Accelerators: Producing Critical Medical Isotopes for Diagnosis and Treatment.”
- Thia Keppel, Jefferson Lab Associate Director for Experimental Nuclear Physics and co-director of the recently formed Biomedical Research Innovation Center (BRIC): “BRIC - New Technologies and Tools for Biomedical Challenges.”
- Carole Johnstone, Fermilab: “Curing Cancer with Accelerators.”
ACCELERATOR SEMINAR - VALERY SHEMELIN - SEPT. 14
On Thursday, Sept. 14 at 11 a.m., Valery Shemelin (Cornell University) will present "Optimization of Superconducting Cavities: Shape, Fields, Multipactor" in the Test Lab rm. 1227 and via Zoom.
Abstract: A method is discussed to search geometrical parameters of elliptical cavities to obtain the best possible figures of merit: BpkEacc (peak magnetic field) and GRQ (losses) for a given EpkEacc (peak electric field), aperture, wall slope angle. The result of this search is the reentrant cavity with a record acceleration rate of 59 MeV/m with the aperture radius of 30 mm and 52 MeV/m with 35 mm. Further improvement in optimization is offered, such as equidistant optimization, which makes clear the dependence of maximal acceleration gradient on the limiting electric and magnetic field, as well as the use of specially developed software – TunedCell on the base of SuperLANS – made possible to find best geometries of cavities in a 4D space of parameters. An overview of different multipactor kinds is presented, zones of 1-point and 2-point multipactor in elliptical cavities are described, and a method to search for multipactor-free geometries is offered. For questions, contact Dennis Turner.
ENGINEERING & ACCELERATOR REORGANIZATION - OCT. 1
As announced in Lab Director Stuart Henderson’s all-staff meeting, the Engineering and Accelerator Divisions are reorganizing to better position resources, responsibilities and accountability for CEBAF operations, maintenance and improvements.
- The entire Electrical Engineering Systems department will move as another department under the Associate Director of Accelerator Operations, Research and Development.
- The vacuum technicians will move to a newly formed Vacuum Group within SRF Operations.
- Specific mechanical engineering staff will move to the SRF Engineering Group within SRF Operations.
For questions, contact Andrei Seryi, Mike Spata, Evelyn Akers, Tim Michalski, Ken Baggett or Erica Jones.
SAFETY PAUSE FORUMS - SEPT. 18, 28 & OCT. 5, 12
The next Safety Pause forum will be held Monday, Sept. 18, 1-1:30 p.m. via Zoom (Meeting ID: 161 209 7909, Passcode: 560140). The agenda consists of updates from division leaders, after-hours work updates, lockout/tagout information, best practices and a Q&A session. For questions, contact Jessica Weaver.
Upcoming Safety Pause Forums are:
- Safety Pause Forum #14 will take place Thursday, Sept. 28 at 1-1:30 p.m. via Zoom (Meeting ID: 160 739 2764, Passcode: 816627)
- Safety Pause Forum #15 will take place Thursday, Oct. 5 at 3-3:30 p.m. via Zoom (Meeting ID: 160 889 3570, Passcode: 429828)
- Safety Pause Forum #16 will take place Thursday, Oct. 12 at 11-11:30 a.m. via Zoom (Meeting ID: 161 574 8727, Passcode: 537514)
For more information about the Safety Pause, click here.
MICROSOFT IN THE CLOUD - SEPT. 14
The third “Microsoft in the Cloud” meetup will be Thursday, Sept. 14 at 11 a.m. in CEBAF Center rm. F224/225 and via Teams. The meetup will cover Forms, SharePoint and PowerAutomate. To see the meeting details, including the Teams link, and add it to your calendar, click here. For questions, contact Erin Clifton.
CST DIVISION MAINTENANCE - SEPT. 19
On Tuesday, Sept. 19, from 5-10 p.m., the CST Division is planning the following maintenance activities and outages:
- External internet access may be briefly unavailable while JLab external firewalls are upgraded.
- The Cisco Jabber Phone Client will be briefly unavailable while the underlying server is updated.
- The FemtoCenter website will be briefly unavailable while a new, updated server is deployed.
- The JLab homepage may also be briefly unavailable while underlying services are upgraded.
- Linux and Windows updates will be released to all centrally managed desktops and servers.
- Centrally managed services, including web and login services, will be briefly unavailable overnight while underlying Linux servers are rebooted to finalize patch installation.
Please plan your work accordingly and contact the CST Division Help Desk at x7155, with any questions.
RECORDS MANAGEMENT UPDATE - JAN. 31
The deadline for departments to submit file plans has been extended to Wednesday, Jan. 31, 2024. Please reach out here for assistance with completing your departmental file plans.
REMINDER: JUST DESSERTS - WHY TAKE A TASTE OF I-CORPS - SEPT. 14
On Thursday, Sept. 14 from 10-11:30 a.m., Just Desserts returns with an in-person information session on Taste of I-Corps (I-Corps Lite) in CEBAF Center rm. L102. Enjoy a tasty treat while feeding your mind and your stomach! Learn more about this session here, and to R.S.V.P., click here.
Starting in October, I-Corps Lite is a six-week short course in which researchers with a research concept develop a business value proposition for lab-generated intellectual property and validate it through numerous customer interviews with industry experts and end-users. Jefferson Lab is teaming up with Idaho National Laboratory and Ames National Laboratory for this program. Participants will have the opportunity to interface with researchers and commercialization team members from INL and Ames Lab and may participate in funded travel and training opportunities. For questions, email the RTPO inbox.
SPOTLIGHT ON PATRIZIA ROSSI - A STRONG FORCE IN PHYSICS
With a passion for understanding how the universe works and a curious desire to unfold theories with logic, it’s no wonder that Patrizia Rossi ventured into physics and is now the Deputy Associate Director (AD) for Nuclear Physics. Rossi began at the lab in 1993 as a scientific user and in 2012, she was asked to apply for a position at the lab and took up the offer.
“I really love working closely with people here, discussing physics, answering questions, and overall assisting the scientific users with their experiments when I can; interacting with ambitious and enthusiastic colleagues is a highly rewarding and motivating environment to be in!” she says.
With more than 35 years of research experience, her contributions to the scientific field are just as impactful beyond the lab. This year, Rossi began serving on the Italian Scientists & Scholars in North American Foundation (ISSNAF) scientific board and has been appointed to present a prestigious award as the co-chair of the 2023 ISSNAF Young Investigator INFN Bruno Touschek Award for Research in Fundamental Physics this upcoming November at the Italian Embassy in Washington D.C. Congratulations, Patrizia! Learn more about Patrizia Rossi here.
CELEBRATE NATIONAL HISPANIC HERITAGE MONTH AT THE LAB - SEPT. 20
On Wednesday, Sept. 20 at 2 p.m., in CEBAF Center rm. F224/225 and via Zoom, the lab will celebrate National Hispanic Heritage Month! Carlos Hernandez-Garcia will discuss the connection between the Mexican Physical Society and Jefferson Lab. Gabriel Palacios-Serrano will present "This isn't flying, this is falling with style: turning a car crash in Mexico into a Ph.D. in the USA." For questions, contact Jennifer Carter.
MOMO'S @ QUARK CAFÉ - A SANDWICH FOR EVERY TASTE!
Indulge in a world of flavor with MOMO’s Weekly Sandwich Specials! Every week, we offer an ever-changing selection of expertly crafted sandwiches. Our tried-and-true staples of grab-and-go sandwiches are also available. To browse daily Quark Café menu options, see the menu link on Insight or on the MOMO's at Quark Café website. For questions, contact Josh Cameron.
