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First Operation of MI8 Collimation

First Operation of MI8 Collimation. Bruce C. Brown All Experimenters Meeting 22 January 2007. MI8 Collimation. Loss Control for Main Injector High Intensity Operation – Demand goes UP Run II began with one Booster Batch Operation ~ 4.5 E 12 p NuMI operation added 5 Booster Batches

bernard-ellison
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First Operation of MI8 Collimation

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  1. First Operation of MI8 Collimation Bruce C. Brown All Experimenters Meeting 22 January 2007

  2. MI8 Collimation Loss Control for Main Injector High Intensity Operation – Demand goes UP • Run II began with one Booster Batch Operation ~ 4.5 E 12 p • NuMI operation added 5 Booster Batches • Run II slip-stacking added another Batch with higher losses • Operation for Run II & NuMi with slip-stacking uses 11 Batches Losses and Residual Radiation • Residual Radiation Survey beginning in June 2004 showed many loss points – especially surprising at Defocusing Quads • Slip-stacking and NuMI operation have raised the average • Careful tuning has kept down the rate of rise. • New Loss Monitor Electronics allow better studies AEM - Bruce C. Brown, Fermilab - Main Injector

  3. MI8 Collimation Collimation Efforts: MI8 – Collimate halo on top-bottom-left-right, two locations (90o advance) with fixed-aperture collimators (2” x 2”) Installed in 2006 Facility Shutdown MI – Collimate slip-stacking losses with a primary (thin) and 4 secondary collimators (fixed aperture) positioned in MI300 Region. For Installation in 2007 AEM - Bruce C. Brown, Fermilab - Main Injector

  4. MI8 Collimation Devices for MI836 and MI838 • Two Collimators with motion systems plus Marble Mask • Vertical and Horizontal BPM’s • Loss Monitor (upstream of Mask, on Wall) AEM - Bruce C. Brown, Fermilab - Main Injector

  5. MI8 Collimation AEM - Bruce C. Brown, Fermilab - Main Injector

  6. MI8 Collimation AEM - Bruce C. Brown, Fermilab - Main Injector

  7. MI8 Collimation Implementation Plan: • Study Collimator Losses vs. Position (LM at 836, 838) • Choose position for each edge • Horizontal and vertical - 4 devices • Measure Effect in MI • Vertical Aperture at Q301 • Loss pattern following injection AEM - Bruce C. Brown, Fermilab - Main Injector

  8. MI8 Collimation Scans of Transmission and Loss Axis: Collimator Position -- 838BV (left) – 836AH (right) Yellow: Transmission (I:TOR806/I:TOR852) Green: Marble Mask Loss Monitor (LM8C1 or LM8C3) Red: Wall-mounted Loss Monitor (LM8C2 or LM8C4) AEM - Bruce C. Brown, Fermilab - Main Injector

  9. MI8 Collimation With Collimation: 6 mm loss free Without Collimation: 2 mm loss free Vertical Aperture Scan at Q301 Scan vs. I:V231 Trim Current Yellow is LM301, Red is VP301 AEM - Bruce C. Brown, Fermilab - Main Injector

  10. MI8 Collimation MI Loss Monitors around ring sampled during 40 ms near injection Black No Collimation Red Horizontal Coll Blue Hor & Ver Coll Big Losses at Lambertson Locations Inj, RR Transfer, Abort, MI52, MI60, MI62 AEM - Bruce C. Brown, Fermilab - Main Injector

  11. MI8 Collimation Next Steps: • Scrape with modest collimation (1/8% per jaw) [Study was with ½% loss per jaw – 3.5% observed] This began on Jan 18. • Study loss effects • Notice operational issues (trip from tune-up beam…) • Scrape more halo as we gain experience MI300 Collimation System: • Install during 2007 Shutdown AEM - Bruce C. Brown, Fermilab - Main Injector

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