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The Story So Far

The Story So Far. Cold in both rings. 4K Wave. PP12 lattice test evening. PS work during Day. Overnight Stores 109x109. PS gave us e-lens. First Collisions. Start Physics. LIPA Maintenance. 6 hour stores with tune between. LIPA Maintenance. 8hr Stores. APEX. Inject =200e11.

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The Story So Far

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  1. The Story So Far Cold in both rings 4K Wave PP12 lattice test evening PS work during Day Overnight Stores 109x109 PS gave us e-lens First Collisions Start Physics

  2. LIPA Maintenance 6 hour stores with tune between LIPA Maintenance 8hr Stores APEX Inject =200e11

  3. Maintenance Switch Fy12 Lattice Pushed Intensity Reach 200e11 At FT Rotator Tuning APEX Maintenance MD Studies Golden Store 17396 Pushed Bunch Intensity APEX Machine Dev. APEX Machine Dev. Test corrected Optics

  4. MD Studies Installed Dpx APEX Maint. Dpx reduction In Blue removed MD Spin Tune Low E APEX

  5. Past week • Machine Development • RF group Damper studies • Removed Dpx reduction in Blue • Trouble with aborts • Steering Star back into full collision • Angles at IP's taken out

  6. Current Situation • As compared to Period (17416-17451) Blue Jet average = 58% we are still low in Blue • During Period with Dpx reduction applied in Blue average Jet numbers for Blue = 51% • Since removal of Dpx reduction Blue Jet = 53% • Not clear that the Dpx reduction was a culprit, however Emittances on the ramp have seemed to blow up on the ramp since 17545 after removal of Dpx reduction so this may obscure issue. Also some of the fills had lower AGS injection numbers. Need more analysis. • Yellow Appears 'healthy' any low jet numbers appear to due to low AGS and/or source numbers.

  7. Blue emittance blow up on energy ramp

  8. Blue shorter bunch length

  9. Future Plans • Run low intensity fill to help diagnose abort situation • Sort out why angle's creeping back into IP's • Spin Tune measurement at FT without rotators to make sure snake currents correct • RF bb damper work to improve performance • Better understand causes of emittance growth in Blue on energy ramp.

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