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General Info

Secondary Beam

  • 31Si14+
  • Energy: ~10.6 MeV/u
  • Requested rate and purity: 5x104 pps, >10 %
  • Achieved rate (pps/pnA):
    • [June 19] Target (5m pps/pnA) [20 pnA 30Si14+]
    • [June 19] Cross (13k pps / pnA)
    • [June 19] Exit (>25k pps / pnA)
  • Purity:
    • [June 19] 50% best (.001% - 50% range)

Tuning Info

Primary Beam (energy) [max pnA]

  • 30Si14+ [11.5 MeV/u, 345 MeV][~20 pnA]
  • Will have 7+ from the source and 14+ after stripping to remove 40Ar contamination at original 9+ charge state
  • 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
30Si14+ primary 345 XXX tof 71 / 273 MeV 273 / 71 MeV none
30Si14+ degraded 298 XXX tof 79 / 222 MeV 301.2 / ~0 MeV D2 Gas
31Si14+ secondary XXX XXX calc 1.6% 81 / 219 MeV 301.3 / ~0 MeV D2 Gas
30Si13+ contam XXX XXX 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...)