Infl9

General Info

• Exp to HELIOS
• [June 19]
• ³¹Si
• Location in in-flight ELOG
• @ SHORTSTOP

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...)