Due to noise and other considerations, it is highly advantageous to postion the readout electronics for a LArTPC inside the cold volume. Development of "Cold Electronics" for readout of the TPC is therefore a key part of the LArTPC scale-up plan. DUNE will have more than one million ionization-sensing wires, each which needs to have its signal readout continuously. SLAC is working on an Application Specific Integrated Circuit (ASIC) that integrates all of the required readout functions into a single chip, called "CRYO".
In previous versions of the electronics, these functions - amplification, digitization and transmission had been each carried out by a separate chip. Integrating them on a single ASIC may greatly reduce the cost and increase the reliability of the electronic system. CRYO has been designed by engineers in SLAC's Advanced Instrumentation for Research (AIR) group. The first protoypes of CRYO were received in January 2019. SLAC physicists are currently working closely with AIR engineers to bench test CRYO. Once those tests are completed in Spring 2019, CRYO will be tested on prototype LArTPCs located at Fermilab in Illinois and at CERN in Switzerland.