Michal Pietrusinski

Internal interface for RPC Muon Trigger electronics at CMS experiment

The paper describes design and practical realization of an internal communication layer referred to as the Internal Interface (II). The system was realized for the RPC Muon Trigger of the CMS experiment. Fully automatic implementation of the communication layer is realized in the FPGA chips and in the control software. The methodology of implementation was presented in the description form of the interface structure from the sides of hardware and software. The examples of the communication layer realizations were given for the RPC Muon Trigger.

Gigabit optical link test system for RPC muon trigger in the CMS experiment

High-energy experiments like Atlas, Alice, CMS or LHCb at the LHC accelerator at CERN will be performed in very harsh conditions for electronic equipment. High radiation level in the experimental halls causes that commonly available electronic devices do not work properly. A specialized optical transmitter--GOL (Gigabit Optical Link) has been designed at CERN to meet the radiation environment requirements. The design goal was to supply device resistant to high radiation, fast, and being able to transmit data through optical links. Transmitter was designed considering two important characteristics of its work environment: high radiation level and gigabit transmission speed. Proper internal structure of GOL chip allows to minimize single event upsets (SEU) caused by ionizing radiation. Unfortunately, the design does not elimiate SEU completely. This paper presents testing system for the GOL. Its main purpose is testing new prototypes of optical fiber gigabit transmission systems using GOL transmitter and commercial receiver components. The system will be implemented in the CMS experiment for control purposes. It will monitor optical link and transmission quality in the RPC detector. System consits of hardware layer and software layer. Hardware layer, based on Latera FPGA programmable devices. Software has been developed using C++ environment integrated with VME controller hardware.

RPC link box control system for RPC detector in LHC experiment

This paper describes the RPC Link Box Control System (RLBCS) developed for the RPC muon trigger in the CMS experiment on LHC collider under construction in CERN (Geneva). RLBCS subsystem is reponsible for relatively slow, bidirectional communication between the link electronics placed on detector and devices of CMS Detector Control System (DCS) located in the control room. The RLBCS is used for diagnostic and control purposes, and therefore it is essential for the RPC muon trigger. The RLBCS is also responsible for configuration of the FPGAs in the RPC link electronics, working in the harsh, irradiated environment. Additionally most part of the RLBCS itself works in the irradiated area, so assuring its reliable operation required some special solutions. All the above factors make this subsystem an important and non-trivial task in the CMS RPC muon trigger development.

Overview of the backing calorimeter after the ZEUS detector upgrade

New hardware and software developments on the Backing Calorimeter (BAC) for the ZEUS detector are presented. The modernization of the detector was related to the recent luminosity upgrade of the HERA accelerator. The role and place of the BAC detector in the ZEUS experiment is described with special emphasis on the new BAC muon trigger and its diagnostic and monitoring system. This overview introduces a series of detailed articles following in this chapter of the SPIE proceedings.

Distributed control system for TRIDAQ boards

This paper presents a distributed control system developed for TriDAQ boards prepared for Resistive Plate Chamber (RPC) detector in Compact Muon Solenoid (CMS) Muon Trigger system to be used in Large Hadron Colider (LHC) in CERN. The control systme is based on Linux servers embedded in TriDAQ boards. The communication between embedded servers and managing/data processing host is assured by the Ethernet network. The embedded controllers offer sufficient computational power to perform board diagnostics and preprocessing of acquired data. Presented solution assures both high flexibility (due to configuration by the network) and high performance (due to highly parallel architecture).

JTAG test system for RPC muon trigger in the CMS experiment

Theoretical and practical realization of the JTAG testing system for the RPC Muon Trigger of the CMS experiment at the LHC accelerator at CERN laboratory (Geneva) is presented. The paper covers issues related to tests of connections of the printed circuit boards (PCB) of the RPC Trigger. Functionality test of devices and modules were performed. Special test were designed for large PLD FPGA. Testing environment for the JTAG model is discussed. The model is based on some existing and some newly developed testing algorithms. Practical system realization is presented. The system consists of the hardware interface and the software layer. Software was built using C++ object oriented language and databases. Exemplary test of the RPC Muon Trigger electronics was performed and the results were given.

Multichannel boundary scan controller

The paper presents, a specially designed chip, which ensures the carrying out of tests compliant with IEEE 1149.1-1990 Std. The above mentioned tests are very useful when checking for any errors and defects in electronics devices. The currently available solutions are not suitable for the requirements, which are quite specific and are the results of past experience. Therefore, a dedicated Field Programmable Gate Array (FPGA) core was created in VLSI Hardware Description Language (VHDL) implementing the desired functionality. The achieved result is a BS controller supporting many BS chains, working in parallel and using pipelining to boost performance.