Pattern Comparator Trigger (PACT) for the muon system of the CMS experiment

The general scheme for the fast, pipelined first level trigger on high pt muons in the CMS detector at LHC is presented. The prototype PACT system was tested in the high momentum muon beams in the RD5 experiment during 1993/94 runs. The obtained efficiency curves are shown

Results of Tests of Inverted Double Gap RPC at the CERN GIF Facility

A medium size prototype of Inverted Double Gap RPC made of low resistivity bakelite plates was tested in the GIF facility at the CERN SPS. The chamber efficiency as a function of the source intensity and its timing properties were studied and found to be excellent

Beam test results of inverted double Gap RPCs with high counting rate capability for the CMS experiment

Two medium size prototypes of Inverted Double Gap RPC were tested in H2 SPS beam at CERN in the intensity range up to 7 kHz/cm2. The detectors having identical construction, but made out of bakelite with the volume resistivity different by three orders of magnitude allowed the study of the impact of the electrode material conductivity on the RPC operation characteristics. The RPC made out of bakelite with 5*10^8 Ohm cm volume resistivity exhibits stable operation in the whole range of beam intensities with full efficiency and good timing properties

Optimization of FPGA processing of GEM detector signal

This paper presents analysis of processing method of the signal from Gas Electron Multiplier (GEM) detector acquired in our Field-Programmable Gate Array (FPGA) based readout system. We have found that simple processing of GEM signal\ud received from the charge amplifier, sampled at 100MHz with 10-bit resolution, after low-pass filtering with 15 MHz cut-off frequency, provides accuracy similar to obtained by processing of the raw GEM signal sampled at 2.5 GHz frequency with 8-bit resolution. Even when 3 bits are lost due to long term instability of the detector and analog part of the system - resulting in 7-bit effective resolution, the reasonable accuracy is still preserved. Additionally we have analyzed computational power required to perform the real-time analysis of the GEM signal, taking into consideration resources offered by the FPGA chip used in the prototype platform.\u

“Pi of the Sky” Detector

“Pi of the Sky” experiment has been designed for continuous observations of a large part of the sky, in search for astrophysical phenomena characterized by short timescales, especially for prompt optical counterparts of Gamma Ray Bursts (GRBs). Other scientific goals include searching for novae and supernovae stars and monitoring of blasars and AGNs activity. “Pi of the Sky” is a fully autonomous, robotic detector, which can operate for long periods of time without a human supervision. A crucial element of the detector is an advanced software for real-time data analysis and identification of short optical transients. The most important result so far has been an independent detection and observation of the prompt optical emission of the “naked-eye” GRB080319B