Possible Experiment at the Fermilab Antiproton Source Desy可能的實(shí)在費(fèi)米實(shí)驗(yàn)室的質(zhì)子源德國(guó)電子同步加速器

1、october 18, 2007qwg5 - desy - gollwitzer 1existing fermilab pbar sourceoctober 18, 2007qwg5 - desy - gollwitzer 2e760/e835 operation stack up to 60-100e10 antiprotons up to 4e10 pbars/hr today 20e10/hr goal 25e10/hr stacking time: 1+ days today 3-4hr of stacking 1-2 hr to decelerate and prepare beam

2、 run experiment 2-4 days luminosity 2-4e31 cm-2s-1 accelerator-jet target capable of 1e32 cm-2s-1 detector designed for e31 cm-2s-1 20+ years of detector & daq improvements 1e32 cm-2s-1 1 hr to re-establish stacking range: 3.4-8.9 gev/c (ecm= 2.9-4.3 gev)october 18, 2007qwg5 - desy - gollwitzer

3、3attempt at comparisonfermilab achievedfair designed20accumulation rate 1010/hr3.52 x 107laboratory running time for one year sec2 x 107pbar vs ion running50%pbar to hesr50%10%stacking fraction due to experiment in the accumulator400# pbars to experiment for one year 10151753.4 to 8.9range gev/c3 to

4、 1510p/p 10-51 or 101-8luminosity 1031 cm-2 sec-11 or 202011start data taking2014october 18, 2007qwg5 - desy - gollwitzer 4physics all charmonium states except (4415) c, j/, cs, hc, /c, / x(3872), z(3930), y(3940), x(4160), y(4260), y(4350)? other non-charmonium measurements are possible as outlined

5、 by fair-panda need to form a collaboration and propose an experiment to start data taking in 2011c2 (2p)october 18, 2007qwg5 - desy - gollwitzer 5empty experiment area october 18, 2007qwg5 - desy - gollwitzer 6quick history the fermilab antiproton source was built for the tevatron proton-antiproton

6、 collider program in the 1980s key to tevatron total integrated luminosity while fermilab ran fixed target programs, the antiproton source would have sat idle except for the charmonium program (e760/e835) which ran in 1990-1, 1996-7 & 2000 circulating antiprotons with internal hydrogen gas jet t

7、arget study of pbar-p annihilations into cbar-c statesa charmonium experiment in the fermilab antiproton source after run iikeith gollwitzerantiproton source departmentaccelerator divisionfermilaboctober 18, 2007qwg5 - desy - gollwitzer 8improvements since e760/e835 accelerator advances can average stacking at 20e10 pbars/hr plans fo