Abstract
A proportional chamber with ring cathode readout is foreseen for the ALICE Time Projection Chamber. It offers low gas gain operation, lightweight construction and good pulse shape. The Tape Automatic Bonding (TAB) process makes it possible to mount the VLSI analog front end electronics directly on the back face of the multilayer board carrying the ring cathode elements, yielding high channel density. At the same time, simulation work is done. Construction and first results will be presented.
Highlights
ALICE, the dedicated heavy ion experiment to operate at the LHC collider 1 will feature a Time Projection Chamber TPC as central tracking device
A rather challenging device due to its experimental boundary conditions: Preprint submitted to Elsevier Preprint operation in a low magnetic eld of 0:2T for tracking and identi cation of particles down to transverse momenta of 100MeV=c operation in very large track densities reaching 3 tracks per event in the drift volume as a consequence, very high electronics density with 5 channels corresponding to 0:6cm2 pad surface long drift time of 100s with 103 time samples in steps of 100ns high expected current load of about 1A=m2 detector surface due to tracks and background penetrating the readout chambers
The four channel dies are bonded directly onto the backplane of the readout chamber, using the Tape Automatic Bonding TAB process developed by Dassault Electronics 4
Summary
ALICE, the dedicated heavy ion experiment to operate at the LHC collider 1 will feature a Time Projection Chamber TPC as central tracking device. A rather challenging device due to its experimental boundary conditions: Preprint submitted to Elsevier Preprint operation in a low magnetic eld of 0:2T for tracking and identi cation of particles down to transverse momenta of 100MeV=c operation in very large track densities reaching 3 tracks per event in the drift volume as a consequence, very high electronics density with 5 channels corresponding to 0:6cm2 pad surface long drift time of 100s with 103 time samples in steps of 100ns high expected current load of about 1A=m2 detector surface due to tracks and background penetrating the readout chambers
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