Infl9

From ATLAS Accelerator In-Flight Beam Program
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General Info

Secondary Beam

  • 31Si14+
  • Energy: ~10 MeV/u for each
  • Requested rate and purity: 5x104 pps, >10 %
  • Achieved rate (pps/pnA):
    • [June 19] (XXX pps/pnA) [XXX pnA XXXXXX]
  • Purity:
    • [June 19] XXX% best

Tuning Info

Primary Beam (energy) [max pnA]

  • 30Si?? [11.5 MeV/u, 345 MeV][120 / 50 pnA]
  • Target: D2 Gas w/ 1.9 mg/cm2 HAVAR windows (3.7 cm, 1400 mbarr, T=90K) [31Si14+]
=====31Si===========

31Si - D2 gas target

Beam Label Energy [MeV] Brho [Tm] calc / TOF Scale Factor DE-E (50 / 1000 um) DE-E (150 / 1000) Target
30Si??+ primary 345 XXX calc 71 / 273 MeV 273 / 71 MeV none
30Si14+ degraded 301.2 0.9791 calc 79 / 222 MeV 301.2 / ~0 MeV D2 Gas
31Si14+ secondary 301.3 0.9944 calc 1.6% 81 / 219 MeV 301.3 / ~0 MeV D2 Gas
30Si13+ contam 267.7 0.9944 calc 87 / 181 MeV 267.7 / 0 MeV D2 Gas
  • Scale Factor:
    • [June 19] 31Si14+ [301.3 MeV] from 31Si14+ [301.2 MeV] scale factor = 0.9944/0.9791 = 1.0156
  • Expected calculated rates for tuning (acceptable - ideal):
    • At EXIT Detector: >5000-10000 pps/pnA (midplane slits set to ~+-4 mm, ~3% momentum acceptance).
    • At HELIOS Cross Detector: >1000-2000 pps/pnA (assumes ~20% transmission, maybe on the high side...)
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