first operation of mi8 collimation
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
First Operation of MI8 First Operation of MI8 CollimationCollimation
Bruce C. BrownAll Experimenters Meeting
22 January 2007
AEM - Bruce C. Brown, Fermilab - Main Injector 222 Jan 2007
MI8 CollimationMI8 CollimationLoss 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 322 Jan 2007
MI8 CollimationMI8 CollimationCollimation 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 422 Jan 2007
MI8 CollimationMI8 CollimationDevices 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 522 Jan 2007
MI8 CollimationMI8 Collimation
AEM - Bruce C. Brown, Fermilab - Main Injector 622 Jan 2007
MI8 CollimationMI8 Collimation
AEM - Bruce C. Brown, Fermilab - Main Injector 722 Jan 2007
MI8 CollimationMI8 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 822 Jan 2007
MI8 CollimationMI8 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 922 Jan 2007
MI8 CollimationMI8 Collimation
Vertical Aperture Scan at Q301Scan vs. I:V231 Trim Current Yellow is LM301, Red is VP301
Without Collimation: 2 mm loss free With Collimation: 6 mm loss free
AEM - Bruce C. Brown, Fermilab - Main Injector 1022 Jan 2007
MI8 CollimationMI8 CollimationMI Loss Monitors around ring sampled during 40 ms near injection
Black No
Collimation
RedHorizontal
Coll
Blue Hor & Ver Coll
Big Losses at Lambertson LocationsInj, RR Transfer, Abort, MI52, MI60, MI62
AEM - Bruce C. Brown, Fermilab - Main Injector 1122 Jan 2007
MI8 CollimationMI8 CollimationNext 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