1. Context of CERN-LAPP collaboration HS, 17+18.11.2009

2. The LAPP team has produced BPM readout electronics for CTF3. The present meetings with CERN-BI and CERN-CO are organized in order to discuss an extension of this collaboration to the CLIC study. The CLIC main beam accelerators consist basically of 22000 almost identical 2m long “modules” These modules will produce about 200 electrical signals each; the signal sources ranging from 18 GHz wakefield monitors, 14 GHz MB BPMs to almost DC temperature sensors. Readout speeds will be slow, max. 50 Hz, but several instruments will produce several acquisitions along the 140 ns beam pulse (BPM sampling time 10 ns) Timing references will need to be brought to the modules with individual time of flight compensation. A parameter specification for the module instrumentation is in preparation, presently we have a list of the 200 signal sources and the signal definitions. ( see attached excel spread sheet)

3. Following the present CERN controls strategy based on COTS, the price tag for the acquisition of 22.000 x 200 signals is unacceptably high. Several prototype studies will be launched for a specific design (with institutes and also with industry) in order to find a cost effective custom made readout and timing system. The proposed CERN –LAPP collaboration consists of new BPM readout electronics at 100 MS/s, configurable multiplexers, timing reception, buffer memories and network communication. Prototypes will be developed first for laboratory tests and then in sufficient number for CTF3 (re)-installation. The PS controls renovation project at CERN will take care that by approx 2012 the controls infrastructure for WR readout will be available. Module N-1Module NModule N+1 Custom box White Rabbit network 200 signals