118362382
News from CERN, LHC Status and Strategy for Linear Colliders
This paper presents the latest development at CERN, concentrating on the status of the LHC and the strategy for future linear colliders. The immediate plans include the exploitation of the LHC at its design luminosity and energy as well as upgrades to the LHC (luminosity and energy) and to its injectors. This may be complemented by a linear electron-positron collider, based on the technology being developed by the Compact Linear Collider and by the International Linear Collider and/or by a high-energy electron-proton collider. This contribution describes the various future directions, all of which have a unique value to add to experimental particle physics, and concludes by outlining key messages for the way forward.
196147152
Experience With the Jade Jet - Chamber at {PETRA} and Pattern Recognition Programs for the Jade Jet - Chamber
117047844
Results from Doris: Neutral detector
The apparatus of the DESY‐Heidelberg group is described. Preliminary results of a recent data evaluation are presented. In the investigation of the two photon cascade ψ′ (3.7) →γ+Pc, Pc→γ+J/ψ (3.1) about 60 events are found with J/ψ→μ+μ− or e+e−. The angular distributions of the γ‐Rays with respect to the beam axis indicate that the intermediate state Pc has non‐zero spin and the mass M(Pc) =3.51±0.02) GeV, while the solution M(Pc) =3.26 GeV seems to be excluded. From a study of total neutral decays of J/ψ (3.1) an upper limit of 1.2% for the neutral radiative decays is obtained.
118687763
The Future of the CERN Accelerator Complex
This chapter looks back at some of the most memorable achievements in high-energy physics during the 50 years spanning CERN's PS and LHC.
19561136
Innovation in Scholarly Communication: Vision and Projects from High-Energy Physics
Having always been at the forefront of information management and open access, High-Energy Physics (HEP) proves to be an ideal test-bed for innovations in scholarly communication including new information and communication technologies. Three selected topics of scholarly communication in High-Energy Physics are presented here: a new open access business model, SCOAP3, a world-wide sponsoring consortium for peer-reviewed HEP literature; the design, development and deployment of an e-infrastructure for information management; and the emerging debate on long-term preservation, re-use and (open) access to HEP data.
120056409
A drift chamber system for the detection of narrow particle jets from e+e− reactions
Abstract The mechanical construction of a cylindrical drift chamber is described. The system is composed of 96 jet chamber cells containing 16 anode wires each. It is operated at a gas pressure of 4 atm.
120207704
Design of a high-brightness, high-duty factor photocathode electron gun
Abstract The proposed UV-FEL user's facility at Brookhaven National Laboratory will require a phatocathode gun capable of producing short ( ps ) bunches of electrons at high repetition rates (5 kHz), low energy spread ( ), a peak current of 300 A (after compression) and a total bunch charge of up to 2 nC. At the highest charge, the normalized transverse emittance should be less than 7π mm mrad. We are presently designing a gun that is expected to exceed these requirements. This gun will consist of 3 1 2 cells, constructed of GlidCop-15, an aluminum oxide dispersion strengthened copper alloy. The gun will be capable of operating at duty factors in excess of 1%. Extensive beam dynamics studies of the gun were used to determine the effect of varying the length of the first cell, shaping the apertures between cells, and increasing the number of cells. In addition, a detailed thermal and mechanical study of the gun was performed to ensure that the thermal stresses were well within the allowable limits and that copper erosion of the water channels would not occur.
56413579
A superconducting short period undulator for a harmonic generation FEL experiment
A three stage superconducting (SC) undulator for a high gain harmonic generation (HGE) FEL experiment in the infrared is under construction at the NSLS in collaboration with Grumman Corporation. A novel undulator technology suitable for short period (6-40 mm) undulators will be employed for all three stages, the modulator, the dispersive section and the radiator. The undulator triples the frequency of a 10.4 /spl mu/m CO/sub 2/ seed laser. So far a 27 period (one third of the final radiator) prototype radiator has been designed, built and tested.<<ETX>>
55001750
Design and construction of a high-duty factor photocathode electron gun
Under a joint collaboration between Grumman and BNL, a high-duty factor (>1%) photocathode electron gun is being constructed for use at the ATF facility at BNL. This gun was designed as the electron source for the proposed UV FEL Users' Facility at BNL. The thermally induced stresses exceed the yield strength of OFHC copper. For this reason, the gun is fabricated from GlidCop, an aluminum oxide dispersion strengthened copper alloy.<<ETX>>