Infl6

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General Info

Secondary Beam

  • 12B5+
  • Energy: 86.8 MeV, 0.9316 Tm
  • Requested rate and purity: 1x106 pps, >50 %
  • Achieved rates [Apr/May 19]:
    • 17k / pnA [HP/Exit w/ 5mm slits], 4.8k / pnA SSX, 1.8k / pnA SST
    • w/ 150 - 200 pnA on Gas cell -> ~2-4e5 pps assumed (x1000 attenuator suggested ~5e4 pps)
  • Purity:
    • [Apr 19] ~90% best

Tuning Info

Target: D2 Gas w/ 1.9 mg/cm2 HAVAR windows (3.7 cm, 1400 mbarr, T=90K)

Beam Label Energy [MeV] Brho [Tm] calc / TOF Scale Factor DE-E (50 / 1000 um) DE-E (150 / 1000)
11B4+ primary 95 1.1666 TOF 11.8 / 83 MeV 40.5 / 54.5 MeV
11B5+ degraded 89 0.90318 TOF 12.5 / 76 MeV 44 / 45 MeV
12B5+ secondary 86.8 0.9316 calc 3.14% 13.7 / 73 MeV 49 / 37 MeV
11B4+ contaminant 60.7 0.9316 calc 17.5 / 43 MeV 60.7 / 0 MeV
  • Scale Factor:
    • [Date 19] 12B5+ [86.8 MeV] from 11B5+ [89 MeV] scale factor = 0.9316/0.90318 = 0.0314
  • Expected calculated rates for tuning (acceptable - ideal):
    • At EXIT Detector: >12000-14000 pps/pnA (midplane slits set to ~+-4 mm, ~3% momentum acceptance).
    • At HELIOS Cross Detector: >5000-6000 pps/pnA (assumes ~40% transmission, maybe on the high side...)
    • At HELIOS Target Detector: >4000-5000 pps/pnA (assumes excellent [80%] transmission through the HELIOS array, maybe on the high side...)

Primary Beam (energy) [max pnA] + Target (thickness)

  • [Date 19] 11B4+(?) (95 MeV from TOF)[150->200 pnA] + D2 Gas w/ 1.9 mg/cm2 HAVAR windows (3.7 cm, 1400 mbarr, T=90K)

Degraded Beam (energy) + Target

  • [Date 19] 11B5+ [~89 MeV from TOF] + D2 Gas w/ 1.9 mg/cm2 HAVAR windows (3.7 cm, 1400 mbarr, T=90K)