Question

The output of these devices is modified by manually adjusting the jaws, and then fine-tuning the leaves of the multileaf collimator in a process called field shaping. Images from a CT scan are used to position and configure these devices in a high-precision technique called IMRT. The output of these devices is measured in monitor units. Four people were killed (-5[1])by a software race condition (10[1]-5[1])that caused a plate to be incorrectly moved out of the path (-5[1])of one of these devices called the Therac-25. (-5[6])The (-5[1])Klystron Gallery (-5[2])sits atop a large-scale one of these devices that consists of a series of RF cavities surrounding a vacuum pipe. Along with a facility at Brookhaven, (-5[1])one of these (-5[1])devices (-5[1])was used to discover (-5[1])the J/psi meson (10[1]-5[2])(“MEE-zon”). For 10 points, radiotherapy produces X-rays with what devices that use alternating electric fields along a straight path to speed up beams of particles? (10[3]0[1])■END■ (10[3]0[9])

ANSWER: linear accelerators [or linacs; accept Varian Clinac; accept Stanford Linear Accelerator Center; prompt on particle accelerators or medical accelerators; prompt on SLAC (“slack”) National Accelerator Laboratory; prompt on descriptions of devices used in radiotherapy or radiation therapy until “radiotherapy” is read; prompt on X-ray generators or descriptions of devices that generate X-rays until “X-rays” is read; prompt on X-ray beams or radiation beams until “beams” is read by asking “what devices are used to generate the beams?”; reject “generators”] (IMRT is Intensity-Modulated Radiation Therapy.)
<Physics>
= Average correct buzz position

Summary

2023 ACF Nationals04/22/2023Y2138%0%86%134.88

Buzzes

PlayerTeamOpponentBuzz PositionValue
Kevin YeUC Berkeley BWUSTL B59-5
S. A. ShenoyGeorgia Tech BClaremont A64-5
Natan HoltzmanStanford ANorthwestern A6410
Shardul RaoMinnesota AHarvard A76-5
Danny HanPenn AHouston A84-5
Jonathan VaysmanMichigan AMIT A84-5
Swapnil GargUC Berkeley AJohns Hopkins A84-5
Gio MazzeoVirginia AImperial A84-5
Julian GatchSouth Carolina APurdue A84-5
Jeya IyaduraiFlorida BDuke A84-5
Matthew SiffYale BFlorida A85-5
Henry CafaroChicago CIllinois A87-5
Daniel YangChicago BNorth Carolina A87-5
Joelle SmartRutgers AMaryland A113-5
Chris RayOhio State AColumbia A116-5
Albert ZhangColumbia BWUSTL A117-5
Halle FriedmanNYU AMinnesota B121-5
Anson BernsBrown ACornell B124-5
Arthur Delot-VilainYale AMcGill A124-5
Arya KarthikGeorgia Tech APenn State A12410
Matt SchiavonePurdue ASouth Carolina A14810
Maximillian NieburJohns Hopkins AUC Berkeley A14810
Kevin FanMcGill AYale A14810
Leo LawFlorida AYale B1480
Vincent DuNorth Carolina AChicago B1490
Carlos DoebeliImperial AVirginia A14910
Charles HangWUSTL AColumbia B1490
Tanis NielsenClaremont AGeorgia Tech B1490
Benjamin WeinerMinnesota BNYU A14910
John BroussardHouston APenn A1490
Karan GurazadaTexas ARutgers B1490
Jacob EgolDuke AFlorida B1490
Yash MandaviaIllinois AChicago C1490
Steven LiuMIT AMichigan A14910
Caleb KendrickMaryland ARutgers A1490
Geoffrey WuColumbia AOhio State A1490