107336571
A survey of NbTi conductor status
43994997
Performance tests of industrial prototype subcooling helium heat exchangers for the Large Hadron Collider
The superconducting magnets of the Large Hadron Collider (LHC) will be cooled at 1.9 K by distributed cooling loops working with saturated two-phase helium, and supplied with cold supercritical helium. In order to minimize the vapor fraction produced in the final expansion, counter-flow heat exchangers will be needed. Such heat exchangers, of compact design, featuring low-pressure drop and handling very low-pressure vapor, are non-standard products, may be of various designs, and built according to various technologies. In order to qualify potential suppliers for the 250-unit series production, CERN has procured 5 g/s prototype subcooling helium heat exchangers from four industrial companies, based on different construction principles, and tested them in collaboration with CEA Grenoble where a dedicated test station has been built. After reviewing the common functional specification, as well as the main design features of the prototypes and test station, comparative performance results are presented, and ...
95821690
EVALUATION OF EXPERIENCE WITH SUPERCONDUCTING MAGNETS OPERATED AT 1.8 K
At the request of the MT8 organizing committee we have arranged a panel discussion on the above subject at the conference. This paper is an attempt to summarize the various contributions presented.
115147658
A NEW SUPERCONDUCTING ECR ION SOURCE FOR THE FUTURE ACCELERATOR FACILITIES
A new electron cyclotron resonance ion source (ECRIS) running at high frequency has been designed in collaboration between INFNLNS and CEA Grenoble. The source, named GyroSERSE, aims to the production of highly charged ions (up to 55 or 60) at intensities so far never obtained and of medium charge states at high intensities (≈1 emA). Both goals are of paramount interest for future accelerators and require high-frequency superconducting ECR ion sources. This means a significant step to achieve with respect to the technology of copper coils and permanent magnets, and also with respect to the new projects of hybrid or fully superconducting magnets. The expected performances of the new source are presented, as estimated from ECRIS scaling laws and demonstrated recently by experiments performed with SERSE at 28 GHz [1,2]. The technological aspects related to high-frequency operation and to cryogenic systems are briefly discussed, thus showing that this kind of source is as versatile as the sources of the previous generation but it shows performances typically ten times higher.
55921471
Searches for Lepton Flavour Violation and Lepton Number Violation in Hadron Decays
In the Standard Model of particle physics, lepton flavour and lepton number are conserved quantities although no fundamental symmetry demands their conservation. I present recent results of searches for lepton flavour and lepton number violating hadron decays measured at the B factories and LHCb. 
In addition, the LHCb collaboration has recently performed a search for the lepton flavour violating decay \tau^- \to \mu^-\mu^-\mu^+. The obtained upper exclusion limit, that has been presented in this talk for the first time, is of the same order of magnitude as those observed at the B factories. This is the first search for a lepton flavour violating \tau decay at a hadron collider.
125262540
Measurement of the track finding efficiency
This note presents a measurement of the track finding efficiency for long tracks in the 2010 and 2011 data. The efficiency is measured using a tag-and-probe technique with J/ψ decays. The overall efficiency depends on the momentum spectrum of the tracks and the track multiplicy of the event. The efficiency ratio between data and simulation is given in a p–η phase space, which can be used by other analyses to correct the simulation and assign a systematic uncertainty. For the momentum spectrum of the J/ψ decay products the overall efficiency ratio is measured to be 99.4± 0.7% for 2010 data and 100.9± 0.6% for 2011 data.