Weekly Summary Tevatron Department Meeting Tevatron Coordinator Dean

Weekly Summary Tevatron Department Meeting Tevatron Coordinator Dean Still Friday, February 26, 2010

Store Summary Store Avg Init. Lumi (E 30) Avg Deliv’d Lumi (nb-1) Time (hr) How did it end? 7619 300 6957 13. 7 Intentional 7620 312 7709 15. 5 Intentional 7621 315 6939 12. 7 Intentional 7625 310 3361 4. 4 Abort Power glitch; 7628 175 4625 18. 2 Intentional After glitch shot from small stash. 7629 247 6333 16. 1 Intentional 7630 307 8330 19. 3 Intentional 7631 289 8406 20. 4 Intentional Reduced B 0 loss ; Pbar long blow up coll; pbar ver blow up SQ 7632 288 6784 13. 7 Intentional Reduced B 0 loss ; Pbar long blow up coll; pbar ver blow up SQ 7634 315 Tevatron Coordinator - FNAL Comments On going 1/4/2022

Important Parameter HEP Taking lower pbars due to losses In Squeeze ~ 400 E 9. Possible To remove limit.

Problems • Losses at LMB 1 SD (~29 rads/sec – quench ~50 rads/sec) remain high during squeeze LBSEQ 7 -14. • Pbar vertical emittance blow up at and pbar beam loss at during squeeze, maybe due to orbit changes. • Pbar vertical emittance blow up at and pbar beam loss at Initiate Collisions. • Pbar long. Growth in squeeze and collisions. Tevatron Coordinator - FNAL 1/4/2022 4

Pbar Performance Vert Emittance Intensity Long

Initial Luminosity Plot

Integrated Friday to Friday

Studies/Work Completed • Tested HFU to verify heater at A 34 connected. • Lowered Pbar tunes at lbseq 25 (due to Scalloping) • Lowered B 0 VPOS ~ 1 mm to. 5 mm to reduce losses at B 0 lbseq 8 -24 • Replaced LVDT signal conditioner F 12 UH collimator. Tevatron Coordinator - FNAL 1/4/2022 8

Losses at B 0 (LMB 1 SD) in squeeze Stores last April Hi Losses Current stores

Changes to orbit to reduce Squeeze losses at B 0 Store 7613 orbits Before moving B 0 VPOS down Store 7632 orbits After moving B 0 VPOS Down ~. 5 mm

B 0 Positions – Tracking through changes

Cross Plane Problems

Off Plane Tune effect

Effects on Losses at D 0 Stores last April Hi Loss Current stores

Compare Proton beam loss in the Squeeze Last April current

Putting pbar sync light in fast Blown

Studies • • • TEL-2 abort gap cleaning test (EOS 1 hour) T-980 end of store (2 -4 hours) 150 gev Chrom Study (2 hours- dedicated at 150 gev, Tan) TEL – (EOS, Valishev) Pbar only store once luminosity is better to document conditions. Tevatron Coordinator - FNAL 1/4/2022 17