The Grizzly, March 29, 2012

Airband Benefits Crime Victims Center • Blues Writer Sharon Bridgforth Reads Work • Gilmore Visits Berman Art Museum • UC Recyclemania Holds Green Day Carnival • Alabama Civil Rights Trip was Living History for Students • Rosati Embraces Opportunity at Frederick Living • Greek Week in Progress, Helps to Unite UC Sororities and Fraternities • Opinion: Trayvon Martin Case is a Wake-Up Call • Ursinus Celebrates St. Patrick\u27s Weekend • Player Spotlight: Amanda Laurito, Track and Field • Rugby Continues Building Tradition • Senior Spotlight: Jeff Ocampo, Men\u27s Lacrossehttps://digitalcommons.ursinus.edu/grizzlynews/1856/thumbnail.jp

The Grizzly, April 5, 2012

String Ensemble Impresses Hope • Career Services Hosts Webinar • Ball at the Bellevue a Success, Continues to Draw Large Number of Student Participants • Sue Thomas Retires from Admissions Staff • Caitlin Callahan Interns as Veterinary Tech • Greek Week Approaches, MAA and Quiz Club Plan to Participate • UC Welcomes Teisa Brown to President\u27s Staff • Nothing to Hate About this Hamlet • Phillies to Continue Success Despite Worries • Senior Spotlight: Garrett Smith, Baseball • Bears Battle Through Wet Weekend • Player Spotlight: Jenni Weber, Softballhttps://digitalcommons.ursinus.edu/grizzlynews/1857/thumbnail.jp

The Next Linear Collider machine protection system

The Next Linear Collider (NLC) electron and positron beams are capable of damaging the linac accelerating structure and beamline vacuum chambers during an individual aberrant accelerator pulse. Machine protection system (MPS) considerations, outlined in this paper, have an impact on the engineering and design of most machine components downstream of the damping ring injector complex. The MPS consists of two functional levels. The first is a system that provides a benign, single bunch, low intensity, high emittance beam that will be used for commissioning and at any time that the integrity or the settings of the downstream component are in doubt. This level also provides for the smooth transition back and forth between high power operation and the benign diagnostic pilot bunch operation. The pilot bunch parameters in the main linac are estimated on the basis of the expected stress in the accelerator structure copper. Beam tests have been done at the SLAC linac to examine the behaviour of the copper at the damage stress threshold. Typical pilot beam parameters (compared with nominal) are: 10 times reduced intensity, 10 times increased horizontal emittance and 1000 times increased vertical emittance, resulting in a reduction in charge density of 105. The second level is the primary protection against a single aberrant pulse. It’s goal is to reduce the possibility that a substantial transverse field changes the trajectory of the high power beam from one pulse to the next. All devices that could produce such a field are 1) monitored by a fast response network and 2) have deliberately slowed response times. A ‘maximum allowable interpulse difference ’ is evaluated for each such device as well as the beam trajectory monitors in each interpulse period.

The Grizzly, February 16, 2012

Professor Debuts A Bright Swarm of Beetles • SPINTfest Offers Alternative Housing Options • S.U.N.\u27s Poetry Slam Entertains with a Variety of Guests • Commencement Awards to be Chosen by Students • UC Roller Hockey Program is Looking to Expand and Improve with New Recruits • UC Students Aid Spring-Ford School District after Tragic Suicide • Neuman Interns as Education Coordinator in Lancaster, PA • Opinion: Valentine\u27s Day Hype is Overblown; Celebrate February 14 Regardless of Relationship Status • Coach Profile: Joe Groff, Women\u27s Volleyball • Senior Spotlight: Lindsay Teuber, Women\u27s Basketball • Senior Wrestlers Exemplify Leadership, Excellencehttps://digitalcommons.ursinus.edu/grizzlynews/1852/thumbnail.jp

The Grizzly, April 19, 2012

Berman Director Announces Departure • Lantern Celebrates 81 Years • McGown to Join Math Department • Professors Host Facebook Discussion in New Hall • Ursinus Students Promote Autism Awareness • Passion for Historical Reenactments • Hon. Richard Murphy Addressed Campus • Meerbergen Co-Leads Therapy Sessions in Pottstown • Opinion: Obama Will Need Help Come November; New York City Isn\u27t All It\u27s Cracked Up to Be • Class of 2012 Athletes Leave Holes to Fill • Field Hockey: Heading to Hollandhttps://digitalcommons.ursinus.edu/grizzlynews/1859/thumbnail.jp

Bayesian inferencing and deterministic anisotropy for the retrieval of the molecular geometry ∣Ψ(r)∣2|\Psi(\mathbf{r})|^2 in gas-phase diffraction experiments

Currently, our general approach to retrieve the molecular geometry from ultrafast gas-phase diffraction heavily relies on complex geometric simulations to make conclusive interpretations. In this manuscript, we develop a broadly applicable ultrafast gas-phase diffraction method that approximates the molecular frame geometry $|\Psi(\mathbf{r}, t)|^2$ distribution using Bayesian Inferencing. This method does not require complex molecular dynamics simulation and can identify the unique molecular structure. We demonstrate this method's viability by retrieving the ground state geometry distribution $|\Psi(\mathbf{r})|^2$ for both simulated stretched NO$_2$ and measured ground state N$_2$O. Due to our statistical interpretation, we retrieve a coordinate-space resolution on the order of 100~fm, depending on signal quality, an improvement of order 100 compared to commonly used Fourier transform based methods. By directly measuring the width of $|\Psi(\mathbf{r})|^2$, this is generally only accessible through simulation, we open ultrafast gas-phase diffraction capabilities to measurements beyond current analysis approaches. Our method also leverages deterministic ensemble anisotropy; this provides an explicit dependence on the molecular frame angles. This method's ability to retrieve the unique molecular structure with high resolution, and without complex simulations, provides the potential to effectively turn gas-phase ultrafast diffraction into a discovery oriented technique, one that probes systems that are prohibitively difficult to simulate.Comment: 16 pages, 8 figures, 2 tables. Please find the analysis code and templates for new molecules at https://github.com/khegazy/BIG

The Grizzly, March 1, 2012

Grasso Hosts Leadership Summit • Board Meets on Diversity Reports • Psychology Major Organizes Autism Discussion • Lt. Gen. Helmick of the US Army to Speak on Campus Tonight at 7 P.M. • Murphy-Stout Interns at South London Hospital • EV Premieres On the Edge • Kelly Herr Competes in Special Olympics in Korea • Opinion: Republicans Need Focus to Win • International Trio Dazzles Students and Faculty • Senior Spotlight: Al Desiderio, Men\u27s Track • Spring Break in Florida for Bears Baseball • Championship Weekend Recaphttps://digitalcommons.ursinus.edu/grizzlynews/1854/thumbnail.jp