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SBS Budget A Staged Approach

SBS Budget A Staged Approach. John J. LeRose Hall A Collaboration Meeting December 10 , 2010. Start with the nuts and bolts If you really want to see the whole budget see: http://www.jlab.org/~lerose/sbs/2nd_go_around/final/Budget_StageA_StageB-Final.xlsx. 2.

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SBS Budget A Staged Approach

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  1. SBS Budget A Staged Approach John J. LeRose Hall A Collaboration Meeting December 10, 2010

  2. Start with the nuts and bolts If you really want to see the whole budget see: http://www.jlab.org/~lerose/sbs/2nd_go_around/final/Budget_StageA_StageB-Final.xlsx 2

  3. A Staged approach to the Super Bigbite Project • The Super Bigbite Project is designed to provide precision measurements of the nucleon form factors GEn, GMn and GEp to unprecedented values of Q2, and to enable a greatly expanded program of DIS experiments. • The first stage, for $1.8M, will be comprised of: • Fully approved: GEn (50 days) and GMn(25 days). • The second stage is for $2.3M. The second stage will open the door to a large group of Super Bigbite experiments including: • Fully approved: GEp to 15 GeV2 (45days), • Conditionally approved: SIDIS: Transversity for 3He(e,e’π/K), high-x u/d ratio using T & 3He • In planning stages: A1n (high Q2), DIS(e,e’ϕ), Transversity in (e,e’πo), PVDIS w 70 msr,, and GEn and Fπ using a neutron polarimeter. 3

  4. Third tracker Hadron calorimeter Second tracker First tracker Vacuum snout Scattering chamber Beam line Pb shield CH2 analyzer Beam 48D48 magnet Magnetic shield The layout of the Super Bigbite apparatus with all components for GEp(5) 4

  5. Stage I of The Super Bigbite program following the 12 GeV upgrade 5

  6. Hall A GEn (E12-09-016) will provide dramatic new insight into nucleon structure • The dramatic turnover of the Argonne DSE model would be clearly visible. • If the turnover is seen, it would provide strong evidence for the importance of diquark degrees of freedom in the nucleon form factors. 6

  7. Hall A GMn(E12-09-19) will provide superb accuracy • WILL GREATLY IMPROVE THE ACCURACY WITH WHICH GMn KNOWN, AND IS ESSENTIAL FOR EXTRACTING GEn, F1, F2 AND DOING FLAVOR DECOMPOSITIONS. • COMPARED TO HALL B, WILL ACHIEVE SUPERIOR ACCURACYIN HALF THE TIME, WITH INDEPENDENT SYSTEMATIC ERRORS. 7

  8. The layout of the Super Bigbite apparatus necessary for the Neutron FFs Hadron calorimeter 48D48 magnet Single-axis GEM tracker • Magnetic: • beam-line cut, power, support platform • but without new coils, lead shielding • Hadron calorimeter • GEM-based veto in front of hadron calorimeter. • INFN funded GEM-based “First tracker” from SBS BigBite GEM-based “First trackers” 8

  9. The layout of the Super Bigbite apparatus necessary for the Neutron FFs Hadron calorimeter 48D48 magnet Single-axis GEM tracker TOSCA calculation was performed and showed that single coil solution is quite adequate for both GEn and GMn GEM-based “First trackers” 9

  10. Stage I Budget for Super Bigbite DOE contributions Non-DOE contributions 10

  11. Stage I DOE funds spent at JLab 11

  12. Stage II of The Super Bigbite program following the 12 GeV upgrade • The second stage comprising a measurement of GEp and more can be completed for an additional $2.3M. The second stage will open the door to a large group of Super Bigbite experiments including: • Fully approved: GEp to 15 GeV2 (45 days) • Conditionally approved: SIDIS: Transversity for 3He(e,e’π/K), high-x u/d ratio using T & 3He • In planning stages: A1n (high Q2), DIS(e,e’ϕ), Transversity in (e,e’πo), PVDIS w 70 msr,, and GEn and Fπ using a neutron polarimeter. 12

  13. scaling with existing equipment and roughly half the time The 12 GeV GEp/GMp Experiment • The proton form factor, according to the most recent NSAC LRP, “... remains the only source of information about quark distributions at small transverse distance scales." • Super Bigbite is the only way to obtain good accuracy at the necessary Q2

  14. Key Goals of the 12 GeV Program • Super Bigbite, together with Bigbite, is the only way to push A1n to x=0.8. • Super Bigbite is currently conditionally approved as the basis for the tritium expt.

  15. The 12 GeV A1n Experiment 11 GeV 8.8 GeV 6.6 GeV E99-117

  16. stage II budget for super bigbite 16

  17. Time line of DOE expenditures Stage I + Stage II Total cost to DOE : $ 4,142 k Total non-DOE contributions: $ 1,110 k + Labor 17

  18. Status of the Budget • The presented budget is how we would like things to work out • The plan has been presented to and been warmly received by Lab Management • Lab Management has promised to present the case to DOE • At this point the actual budget is all conjecture!

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