M. Padrta

The CMS Drift Tube Trigger Track Finder

Muons are among the decay products of many new particles that may be discovered at the CERN Large Hadron Collider. At the first trigger level the identification of muons and the determination of their transverse momenta and location are performed by the Drift Tube Trigger Track Finder in the central region of the CMS (Compact Muon Solenoid) experiment, using track segments detected in the Drift Tube muon chambers. Track finding is performed both in pseudorapidity and azimuth. Track candidates are ranked and sorted, and the best four are delivered to the subsequent stage, the Global Muon Trigger, which combines them with candidates found in the two complementary muon systems of CMS, the Resistive Plate Chambers and the Cathode Strip Chambers. The concept, design, control and simulation software as well as tests and the expected performance of the Drift Tube Trigger Track Finder system are described.

A 1-GHZ FLASH-ADC MODULE FOR THE TAGGING SYSTEM OF THE CP-VIOLATION EXPERIMENT NA48

Abstract An 8-bit 1-GHz Flash-ADC module has been developed for the tagging system of the CP-violation experiment NA48 at CERN. The module contains two independent channels with 500 MHz sampling rate, which can be interleaved to obtain one channel with an effective sampling rate of 1 GHz. Both FADC chips run continuously and data samples are stored for 524 μs in a ringbuffer memory until they are overwritten by new data. During their “lifetime” data can be extracted from the ringbuffer without disturbing the write cycles. The module fits into a VXI-D crate and uses the VME bus. The design, construction, operation and performance of this module are presented.