Infl7

Secondary Beam(s)

• ⁸Li³⁺
• Energy: ~9.2 MeV/u
• Requested rate and purity: 5x10⁴ pps, >50 %
• Achieved rate (pps/pnA):
  • [May/June 19] >3000 pps/pnA at EXIT, >400 pps/pnA HELIOS Target
  • [May/June 19] >4x10⁴ pps on target [~125 pnA ⁷Li²⁺]
• Purity:
  • [May/June 19] >95% average

General Info

• ⁸Li(t,p)¹⁰Li
• [May/June 19]
• ⁸Li
• Location in in-flight ELOG
• @ HOMEPLATE and SHORTSTOP

Tuning Info

Primary Beam (energy) [max pnA]

• ⁷Li³ [11 MeV/u, 77 MeV][100 - 150 pnA ??]

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

⁸Li³⁺

Beam	Label	Energy [MeV]	Brho [Tm]	calc / TOF	Scale Factor [%]	DE-E (50 / 1000 um)	DE-E (150 / 1000)	Target
7Li3+	primary	77	1.11976	calc		3.4 / 73.6 MeV	10.7 / 66.3 MeV	D2
7Li3+	degraded	74.9	1.1043	calc		3.5 / 71.4 MeV	11.0 / 63.9 MeV	D2
8Li3+	secondary	73	1.1647	calc	5.5%	3.9 / 69.1 MeV	12.6 / 60.4 MeV	D2

• Scale Factor:
  • [May/June 19] ⁸Li³⁺ [73 MeV] from ⁷Li³⁺ [74.9 MeV] scale factor = 1.1647/1.1043 = 1.0547 (5.5%)

• Expected calculated rates for tuning (acceptable - ideal):
  • At EXIT Detector: >500-2000 pps/pnA (midplane slits set to ~+-4 mm, ~3% momentum acceptance).
  • At HELIOS Cross Detector: >200-500 pps/pnA (assumes ~40% transmission, maybe on the high side, need more empirical data)