1. H. Löhner - Triggerless Readout System
Trigger-less Readout System with Pulse Pile-up Recovery for the PANDA Electromagnetic Calorimeter M. Kavatsyuk, G. Tambave, M. Hevinga, P.J.J. Lemmens, P. Schakel, F. Schreuder, R. Speelman, H. Löhner, KVI Groningen, The Netherlands, for the PANDA Collaboration
High-resolution ElectroMagnetic Calorimeter:
17000 PbWO4 (PWOII) crystals,
light yield 500 photons/MeV at T=-25°C,
7x14 mm2 HAMAMATSU APD sensors
Trigger-less Data Acquisition
Self-triggered intelligent front end,
autonomous hit detection;
time-sorting, online processing in FPGA
Operation at 20 MHz annihilation rate
→ 500 kHz hit rate
May 2012
H. Löhner - Triggerless Readout System

2. Prototype of Complete Readout Chain developed, tested, evaluated
Synchronous
Optical Link Connection
Bit Phase Locking
 stability of recovered phase
measured jitter
of single channel < 23 ps!
Online Pile-up Recovery
of overlapping amplitudes A1, A2
Poisson time distribution
x1000 amplitude range
rejection
remaining pile-up rate
May 2012
H. Löhner - Triggerless Readout System