 | Thursday, March 9, 2006 |
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Thursday, March 9
Friday, March 10 |
 Rain 50º/35º
Extended Forecast |
Secon Level 3 |
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Thursday, March 9 -Minnesota Wild Rice w/Chicken -Tuna Melt on Nine Grain -BBQ Ribs -Chicken Casserole -Buffalo Chicken Wrap -Mexican Pizza -Mandarin Chicken Salad |
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Thursday, March 9
Wednesday, March 15
Chez Leon Menu |
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Shutdown Upgrades Focus on
Booster and Main Injector
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Accelerator upgrades during the current shutdown include two major modifications in the Main Injector and two major modifications in the Booster.
Main Injector: Four new collimators and seven upgraded magnets. Technicians are installing four collimators in the Main Injector line that delivers beam from the Booster to the Main Injector. Previously there were no collimators in this region. Technicians are replacing the existing quadrupole magnets in all Main Injector extraction/injection areas with new magnets that have a larger aperture--increased from 3.3" to 4.4"--to help reduce beam losses. Installation of five of the seven new magnets will require exposing Lambertson magnets to air. "The Lambertson magnets then must be rebaked to remove all the water to get a good vacuum again," explains Ioanis Kourbanis, Main Injector Dept. Head. Modifications to the cooling system in the (Main) Proton Injection kicker have also begun. Upgrading the cooling system will allow the kicker to fire at a higher rep rate, needed for NuMI slip stacking.
Booster: Magnet upgrades and relocation of dump site. Technicians are replacing the magnet system in the Linac-to-Booster line with magnets that can pulse at a higher rate without overheating, which should improve injection efficiency. The other Booster modification involves removing one of the Booster's two extraction regions. "We're removing the one that used to go to the main ring, which is now used as a dump," says Eric Prebys, Proton Source Dept. Head and Proton Plan project manager. "We found that having that second extraction region made it difficult to accelerate beam in the Booster without scraping." The dump site will be "relocated" to the MI-8 line, which goes to the Main Injector and MiniBooNE.
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Simulating Supersymmetry
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One of the discoveries eagerly anticipated by particle physicists working on the world's next particle collider is that of supersymmetry, a theoretical lost symmetry of nature. Supersymmetry, often called SUSY, predicts the existence of a superpartner particle for every known particle.
Why the big hunt for SUSY's "sparticles"? Recent experiments have suggested that most of the matter in our universe is not made of familiar atoms, but of some new sort of "dark matter." Discovering a hidden world of sparticles will shed light on the nature of this dark matter, connecting observations performed at earth-based accelerators with those performed by astrophysicists and cosmologists.
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House Committee on Science Press Release, March 7, 2006: House Passes Resolution Recognizing Importance of Engineering, Reaffirms Commitment to U.S. Competitiveness WASHINGTON, March 7, 2006 – By voice vote, the House of Representatives today passed a resolution recognizing the importance of the engineering profession and supporting the goals and ideals of National Engineering Week.
The resolution, H. Res. 681 was introduced by Representative Daniel Lipinski (D-Ill.) and Research Subcommittee Chairman Bob Inglis (R-S.C.). Chairman Inglis managed floor consideration of H. Res. 681.
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| CDF: Looking at Mass Bumps from a Different Angle | |||
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While the Standard Model (SM) has withstood all experimental tests to date, physicists believe it is incomplete. Many SM extensions predict new particles that could be produced in collisions at the Tevatron. Among these exotic particles are heavy neutral bosons, dubbed Z' (Z prime), whose decay to an electron and anti-electron (positron) would leave a distinctive signal in the CDF detector.
Measurements of the electron and the positron can be combined to reconstruct the mass of the pair, Mee. The presence of a heavy Z' would generate a peak, or "mass bump," in the Mee distribution at the Z' mass. An additional, more subtle property of the Z' is that it alters the preferred direction of the produced electron. By including this angular information, the Z' bump search becomes more sensitive than using Mee alone; for some Z' models it is the equivalent of having 25 percent additional data in the sample!
This analysis was performed on |
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| Result of the Week Archive
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Fermilab Film Series
Professional Development Schedule:
March 14: Excel Power User / Macros
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