Infl6

General Info

• Wuosmaa (UConn)
• [Apr 19]
• ¹²B(t,p)¹⁴B
• Location in in-flight ELOG
• @ HELIOS (shortstop or thirdbase?)

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] ¹¹B^4+(?) (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)