2. silicon drift detectors
2d particle tracking
Large Area Silicon Drift Detectors for X-ray spectroscopy, timing and imaging designed by INFN Trieste and developed in collaboration with INAF (IAPS Rome, IASF Bo), Fondazione Bruno Kessler, PoliMi, University of Pavia, University of Bologna
>10 yrs R&D
Two side planar process on high resistivity (FZ or NTD) n-type Silicon
Linearly scaling potentials are applied to drift cathodes by means of an integrated voltage divider to generate a constant electric field parallel to the detector surface directed outwards an array of anodes

3. large area silicon drift detectors
1.5d spatial resolution
anode
drift
Campana et al., 2011
Evangelista et al., 2012
The Gaussian-shaped cloud propagates along the drift direction, and reaches the read‐out anodes with a width σ which can be expressed as:
The cloud can then be fitted using
deriving Qtot, the anodic (X0) and the drift (σ) coordinates, the baseline (K)

4. IMAGING PERFORMANCE
32ch asic µm pitch sdd
Anode pitch was optimized for imaging (taking into account constraints on power, ASIC size, bonding pad pitch, energy resolution, lower energy threshold…)
Evangelista et al., 2012

5. Imaging performance of the ALICE SDD
Alice + discrete fee set-up
Imaging performance of the ALICE SDD
(294 µm pitch) +
8ch discrete FEE
Anode segmentation provides 1D photon absorption position with high spatial resolution (tens of µm)
e- cloud width (σ) encodes information on drift distance → 2D (asymmetric) spatial resolution
D → diffusion coeff.
t → drift time
kB → Boltzmann c.
q → electron charge
x → drift length
E → electric field strength
Campana et al., 2011

6. FEE requirements

7. Fee requirements

8. Pcb material

9. Pcb desing

10. Mechanical interface