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Buttons and Bellows for PEP-II
Profile: Joanne Bogart
Volunteers Still Needed for Science Bowl
Wednesday - January 17, 2007 |
Buttons and Bellows for PEP-IIThe Accelerator Systems Division has buttoned up the PEP-II rings. Now the accelerator is ready once again to deliver beams to BaBar after a maintenance shut down, and the accelerator sports 650 new buttons. The buttons are part of the beam position monitors that keep track of the beam's exact location. Early this year, in the final days before closing the doors to the BaBar detector, the accelerator division squeezed in one more upgrade taskadding a new bellows unit on the forward side of the detector. The bellows unit provides a flexible place where the two separate pipes carrying electrons and positrons join into a single beam pipe just before reaching the detector. Both bellows and buttons caused trouble during the 2006 run, when higher currents coursing through the accelerator generated "higher order mode" radio frequency power. The excess power overheated buttons; six fell off and disturbed the beam, requiring down time to remove them from the beam pipe. Read more... |
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