Heavy-Ion Heavy-Ion Beam Calculator v1

SEE facility LET / range engine — SRIM-derived data · 73 ions, 0.1–2500 MeV/u · Effective LET, layer rotation, degraders, selectable target.

Beam

Facility

Cocktail Beam

Ion

Energy [MeV/u]

Geometry & Target

Incidence angle θ [deg]

LET target material

Rotating layers use path length t/cosθ. Effective LET = surface LET / cosθ.

Layer stack (beam → device)

#	Material	Thick	Unit	Rotθ

Facility degraders:

Degrader solver (toward Bragg peak)

Target LET in Silicon [MeV·cm²/mg]

Result at device surface

Surface LET (target)

—

MeV·cm²/mg

Effective LET (θ)

—

MeV·cm²/mg

Exit energy

—

MeV/u

Residual range (target)

—

µm

Per-layer transport

Layer	Eff. thick [mm]	Entry E [MeV/u]	Exit E [MeV/u]	Entry LET	Exit LET	Resid. range in layer [mm]

Facility finder — inverse search

Define the device overlayers above the sensitive volume, an effective-LET window, a minimum residual range in the SV, and a minimum air gap. The finder sweeps every facility / cocktail ion across angle, degrader, and air gap, and lists what can meet the spec. Overlayers rotate with the part. Configurations degraded past the Bragg peak (ion arrives below the peak energy — ambiguous LET, short range, severe straggling) are rejected by default.

Device overlayers (above SV)

#	Material	Thick	Unit

SV target material

Min air gap [mm]

Min eff. LET (blank=any)

Max eff. LET

Min residual range in SV [µm]

Show back-of-Bragg-peak options (flagged red; not recommended)

Facility	Ion	E [MeV/u]	Angle	Degrader	Air [mm]	Eff LET	Surf LET	Range [µm]	E@SV [MeV/u]	Peak side	Achievable eff-LET span