12,374 Works

System Design of the ATLAS Absolute Luminosity Monitor

Francis Anghinolfi, Sebastien Franz, B Lundberg, Georges Blanchot & W Iwanski
The ATLAS absolute luminosity monitor is composed of 8 roman pots symmetrically located in the LHC tunnel. Each pot contains 23 multi anode photomultiplier tubes, and each one of those is fitted with a front-end assembly called PMF. A PMF provides the high voltage biasing of the tube, the frontend readout chip and the readout logic in a very compact arrangement. The 25 PMFs contained in one roman pot are connected to a motherboard used...

Permanent magnets including undulators and wigglers

J Bahrdt
After a few historic remarks on magnetic materials we introduce the basic definitions related to permanent magnets. The magnetic properties of the most common materials are reviewed and the production processes are described. Measurement techniques for the characterization of macroscopic and microscopic properties of permanent magnets are presented. Field simulation techniques for permanent magnet devices are discussed. Today, permanent magnets are used in many fields. This article concentrates on the applications of permanent magnets in...

Advances in HTS materials

P Tixador
HTS (High Temperature Superconductor) offer great opportunities to reach higher magnetic flux densities when compared with LTS (Low Temperature Superconductor). The upper generally accepted limit of 23 T using Nb3Sn can be overstep with HTS. HTS Bi-2212 round wires have shown critical current densities as higher than 1000 MA/m2 under 45 T at 4.2 K. The road for very high fields is open. The round shape suits rather well for magnets, especially with high current...

Software to preprocess the Muon and Electron datasets for the two-lepton/four-lepton analysis example

Ana Rodriguez Marrero
Software to preprocess the Muon and Electron datasets for the two-lepton/four-lepton analysis example

A BiCMOS synchronous pulse discriminator for the LHCb calorimeter system

S Bota, R Graciani, A Diéguez & D Gascón
A monolithic prototype for the analogue readout of the Scintillator Pad Detector (SPD) of the LHCb calorimeter is presented. A low power version that works at 3.3 V has been designed using the 0.8 mu m Bi CMOS technology of AMS. It consists of a charge discriminator with a dual path structure formed by an integrator, a pile-up correction, a subtractor and a comparator. The chip also includes a DAC and serial digital control interface...

The LHCb Silicon Tracker: lessons learned (so far)

A Vollhardt
The LHCb Silicon Tracker is part of the main tracking system of the LHCb detector. It covers the full acceptance of the experiment in the Tracker Turicensis (TT) in front of the dipole magnet and the innermost part in the three Inner Tracker (IT) stations downstream of the magnet. We report on final elements of the production, the installation and commissioning process in the experiment. Focusing on electronic and hardware issues we describe the lessons...

Measurements of g-factors of isomeric states in fission fragments

A Wolf & E Cheifetz
The inherent alignment of the fragments from spontaneous fission of /sup 252/Cf was used to measure the sign and magnitude of g-factors of isomeric states by the time differential perturbed angular correlation method. The result for the 6/sup +/ isomeric state of /sup 135/Te, composed predominantly of two protons in a (g/sub 7/2/)/sup 2/ configuration coupled to a double magic core, is g=+0.846+or-0.025. This is significantly above the Schmidt value and is discussed in terms...

Trigger Implementation in the KLOE Experiment

A Sciubba, F Bossi, G De Robertis, R Messi, P Branchini, M Palutan, V Bocci, V Patera & G Felici

Lasertron for a linear collider in TeV region

K Soda, Y Fukushima, S Takeda, N Nakano, Y Kato, H Matsumoto, M Miyao, K Takata, T Shidara, T Shintake, H Nishimura, S Noguchi, T Kanabe, M Mutou, H Mizuno, H Kuroda, T Kamei, I Sato & M Yoshioka

Use of real-time UNIX in data acquisition for HEP

G Ambrosini, C Rondot, D Prigent, G Polesello, A Khodabandeh, R Jones, R Ferrari, P Ganev, F Tamburelli, Livio P Mapelli, C P Bee, S Hellman, G Fumagalli, Giuseppe Mornacchi & S Buono

Experiments on a 14.5 GHz ECR source

K Langbein & C E Hill
The 14.5 GHz ECR4 source supplied to CERN in the framework of the Heavy Ion Facility collaboration provided Pb27+ operational beams to a new custom built linac in 1994. This source, which operates in the pulsed "afterglow" mode, quickly met its design specification of 80 emA and now provides currents >100 emA regularly. Early source tests showed the existence of extremely stable modes of operation. In the search for higher intensities a number of experiments...

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