Characteristics of all components itype size X0, A unit main functions tracker Si70cm×2×07 X-y Charge (top) strips 70 cm (W foils)Early shower Tracks tracker Si 65 cm X 2 X0 7 X-y Charge 4 sides strips 50 cm (W foils)Early shower Tracks CALO 10K63cm×553cm× e/y energy LYSO63cm×X0 3cm× nucleon energy cubes 63 cm 3 a 3 cm e/p separation 42
Characteristics of all components type size X0,λ unit main functions tracker (top) Si strips 70 cm × 70 cm 2 X0 7 x-y (W foils) Charge Early shower Tracks tracker 4 sides Si strips 65 cm × 50 cm 2 X0 7 x-y (W foils) Charge Early shower Tracks CALO ~10K LYSO cubes 63 cm × 63 cm × 63 cm 55 X0 3 λ 3 cm × 3 cm × 3 cm e/γ energy nucleon energy e/p separation 6/42
Expected performance of HERD y/e energy range(CALO) tens of Gev-10TeV nucleon energy range(CALO) up to PeV ye angular resol 0. nucleon charge resol 0.10.15cu yle energy resolution(CALO) <1%@200GeV proton energy resolution(CALO) 20% elp separation power(CALO) <105 electron eff. geometrical factor( CALO)3. 7 m2sr@600 Gev proton eff. geometrical factor( CALO) 2.6 m2sr@400 TeV Acceptance H-energy >n10X all others 7142
Expected performance of HERD γ/e energy range (CALO) tens of GeV-10TeV nucleon energy range (CALO) up to PeV γ/e angular resol. 0.1o nucleon charge resol. 0.1-0.15 c.u γ/e energy resolution (CALO) <1%@200GeV proton energy resolution (CALO) 20% e/p separation power (CALO) <10-5 electron eff. geometrical factor (CALO) 3.7 m2sr@600 GeV proton eff. geometrical factor (CALO) 2.6 m2sr@400 TeV Acceptance & H-energy > n10X all others 7/42
Other detectors: Top down÷“ small"Fo∨ Plastic Scintillator Detector Silicon- Tungsten Tracke BGO Calorimeter 64P DAMPE 2015 Neutron Detector ISS-AMS W converter thick calorimeter (total 33 X) precise tracking charge measurement 2011 high energy y-ray, electron and CR telescope TCD ISS-CALET: 2015 Event inside TCD-CAL acceptance SCD. CAL ISS-CREAM 2017? 3E8 arbon targe S3 hodoscope BASE PANEL 2
Other detectors: Top down → “small” FoV ISS-CREAM: 2017? ISS-CALET: 2015 ISS-AMS: 2011 DAMPE 2015 8/42
HERD Design 3D Calo&5-Side Sensitive n10X acceptance than others, but weight 2.3 T-1/3 AMS STK(W+SSD) Charge gamma-ray direction cR back scatter 3D CALO STK(W+SSD) e/G/CR energy e/p discrimination 42
HERD Design：3D Calo & 5-Side Sensitive n10X acceptance than others, but weight 2.3 T ~1/3 AMS 3D CALO e/G/CR energy e/p discrimination STK(W+SSD) STK(W+SSD) Charge gamma-ray direction CR back scatter 9/42
Simulation results: energy resolutions 25 09 ·Npe.:10/MP 24 08 23 0.7 edep Protons 0.6 2 05 20 04 Electrons 19 0.3 18 0.2 17 0.1 16 15 2004006008001000 Eo(Gev 10 Proton Energy (TeV) Electron 1%: Proton -20% Essential for spectral features 42
Simulation results: energy resolutions Electron < 1%; Proton: ~20% Essential for spectral features! Electrons Protons 10/42