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

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Presentation on theme: "First Operation of MI8 Collimation Bruce C. Brown All Experimenters Meeting 22 January 2007."— Presentation transcript:

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

2 AEM - Bruce C. Brown, Fermilab - Main Injector 2 22 Jan 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  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

3 AEM - Bruce C. Brown, Fermilab - Main Injector 3 22 Jan 2007 MI8 Collimation Collimation Efforts: MI8 – Collimate halo on top-bottom-left- right, two locations (90 o 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

4 AEM - Bruce C. Brown, Fermilab - Main Injector 4 22 Jan 2007 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)

5 AEM - Bruce C. Brown, Fermilab - Main Injector 5 22 Jan 2007 MI8 Collimation

6 AEM - Bruce C. Brown, Fermilab - Main Injector 6 22 Jan 2007 MI8 Collimation

7 AEM - Bruce C. Brown, Fermilab - Main Injector 7 22 Jan 2007 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

8 AEM - Bruce C. Brown, Fermilab - Main Injector 8 22 Jan 2007 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)

9 AEM - Bruce C. Brown, Fermilab - Main Injector 9 22 Jan 2007 MI8 Collimation Vertical Aperture Scan at Q301 Scan vs. I:V231 Trim Current Yellow is LM301, Red is VP301 Without Collimation: 2 mm loss free With Collimation: 6 mm loss free

10 AEM - Bruce C. Brown, Fermilab - Main Injector 10 22 Jan 2007 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

11 AEM - Bruce C. Brown, Fermilab - Main Injector 11 22 Jan 2007 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


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