Radiation tolerance of the WorldFIP fieldbus interface

This paper summarises on radiation tests on the main components for the WorldFIP fieldbus interface. The chipset based on 0.6 \mu­m technology has a total dose tolerance of 100 Gy (Co-60) and in standalone mode, no functional interrupts from single events have been observed during proton irradiation (60 MeV). The chipset based on 0.5 \mu­m technology has a total dose tolerance of 150 Gy (Co-60) but shows a sharp increase in the single event cross section after a dose of 70 Gy. Finally, it was found that the chipset based on 0.5 \mu­m technology operates reliable in standalone mode in a magnetic field up to 4.6 kGauss

5 years Radiation Testing of electronic components and systems for the LHC experiments and the LHC machine : summary and future

A summary on the last 5 years radiation testing of equipment for the LHC project in dedicated facilities outside CERN is presented. The proton irradiation facilities in CRC Louvain la Neuve and in the Paul Scherrer Institute have given an important contribution to the design of the LHC equipment. The intensive testing efforts from CERN groups in the last 5 years underline that radiation tolerance has become a design and operational constraint for the LHC. Radiation testing will most likely continue during the LHC commission phase when radiation induced equipment failures will start to appear

Radiation monitors as a vacuum diagnostic in the room temperature parts of the LHC straight sections

In the absence of collisions, inelastic interactions between protons and residual gas molecules are the main source of radiation in the room temperature parts of the LHC long straight sections. In this case the variations in the radiation levels will reflect the dynamics of the residual pressure distribution. Based on the background simulations for the long straight section of the LHC IP5 and on the current understanding of the residual pressure dynamics, we evaluate the possibility to use the radiation monitors for the purpose of the vacuum diagnostic, and we present the first estimates of the predicted monitor counts for different scenarios of the machine operation

A Prototype ATM Network for Real Time Control of the LHC

The LHC accelerator aims at injecting, accelerating and colliding beams with very well controlled beam parameters (e.g. momentum, orbit, tune and chromaticity). This is a non-trivial task since the super conducting main bending magnets will generate field errors with dynamic effects that may result in beam loss. To overcome this problem, real time control of beam parameters via the Power Converters has been proposed. This requires site wide deterministic communication of control data. In this paper we will outline some aspects of a prototype deterministic network for the LHC with a core based on ATM (Asynchronous Transfer Mode) communication technology

Single event errors in the LHC

Following a short introduction on the discovery of Single Events Errors (SEE), this paper will focus on how the SEE have been taken into account in the LHC baseline design. The current status of the radiation tolerance of the baseline accelerator will be presented and qualitative predictions on SEE for the first years of operation will be given

Interfacing with the LHC accelerator during physics operation

A number of critical LHC machine experiments interface issues are highlighted. Particular emphasis is given to particle losses and their impact on the LHC performance. It will be shown how the risk of radiation induced failures to equipment can be reduced via shielding, radiation tolerant equipment designs and on-line radiation monitoring. Recent data on beam induced backgrounds and radiation at the Tevatron and in CDF (Fermilab) is given as an example

Radiation levels in RE38 during nominal LHC operation

Simulated radiation levels at the location of the electronic racks inside the RE38 alcove under nominal LHC running conditions are presented. The levels are expressed in terms of total dose [Gy], 1MeV equivalent neutrons fluence and the fluence of hadrons having energy in excess of 20 MeV. When the average loss rate around the ring is 1.65¥1011 m-1y-1 the annual dose inside an electronics rack in the alcove is 0.05 Gy [Si], the annual 1 MeV eq. neutron fluence is 5 x 108 per cm2 and the annual high energetic hadron fluence is 5 x 107 per cm2. A standard concrete shielding chicane identical to those used in all other alcoves inside the LHC tunnel would reduce the particle fluences with a factor 10