摘要:

A novel technique to stretch the anode wire simply by the gas over‐pressure inside straw drift tubes reduces the necessary straw weight to an absolute minimum. Our detector will consist of more than 3000 straws filling up a cylindrical tracking volume of 1mdiameter and 30cmlength. The projected spatial resolution is 200&mgr;m. The detector with a total mass of less than 15kgwill be operated in vacuum, but will have an added wall thickness of 3mm mylar, only. The detector design, production experience and first results will be discussed. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664352

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The measurement of low‐mass lepton pairs provides a unique opportunity to study in‐medium effects of vector meson production and the possibility of chiral symmetry restoration in heavy ion collisions.However, this measurement is extremely difficult experimentally due to the large combinatorial background produced by Dalitz decays and conversions.The PHENIX collaboration has proposed constructing a new detector as part of its future upgrade program that would provide a high level of rejection against the Dalitz decay and conversion backgrounds, while at the same time preserving good efficiency for measuring vector mesons and low‐mass electron pairs.This device would consist of a hadron‐blind detector that would identify electrons by detecting Cherenkov light produced in a gas radiator, and could also incorporate the features of a Time Projection Chamber that would serve as a tracking detector to track low‐momentum particles in a low‐magnetic‐field region produced in the central PHENIX spectrometer.The strategy for identifying and rejecting Dalitz pairs and conversions using this technique is discussed, along with some of the ongoing R&D efforts. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664353

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Ideas are being presented about how to measure the electron beam polarization at the Electron Ion Collider (EIC) at RHIC with high precision. Based on lessons learned at the HERA storage ring it is discussed which design and physics processes might be most appropriate for EIC. This is a summary of the ideas and concepts discussed at the first workshop on EIC electron beam polarimetry at BNL in November 2002. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664354

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The Rare Isotope Accelerator is a bold initiative for the U.S. nuclear science community that promises to revolutionize studies of nuclei far from stability. In this talk, a perspective on the role of RIA in enabling major progress in nuclear structure and nuclear reaction research and some important recent steps in technical progress for RIA are reviewed. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664355

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Over the last five years, there has been substantial international interest in a high luminosity (approx. 1033cm−2s−1) polarized electron‐ion collider covering a CM energy range from about 30 to 100 GeV. Workshops have taken place in Europe in 1997 and in the United States at IUCF (1999), BNL (1999), Yale (2000) and MIT (2000). An Electron‐Ion Collider (EIC) collaboration was formed in the fall of 2000, and in the United States, the 2001 Long Range Plan favorably endorsed the science of EIC and urged R&D support as a high priority. In March 2002, a series of workshops at BNL involving over 150 physicists from around the world agreed to produce a conceptual design of an electron‐ion collider within three years. Further, it was agreed to develop this design around the existing Relativistic Heavy Ion Collider (RHIC) at BNL. This design is known as eRHIC. In this paper the scientific highlights of eRHIC are described. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664356

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Electron‐light ion colliders with center of mass energy between 20 and 100 GeV, luminosity between 1033and 1035cm−2sec−1, and polarization of both beams at or above 80&percent; have been proposed for the study of hadronic structure. The Electron‐Light Ion Collider (ELIC) facility would require the upgrade of CEBAF to 5–7 GeV energy recovering linac and the realization of an ion storage ring complex, accelerating and storing light ions of up to 150 GeV. In this report several innovative features of electron and ion beam designs and their advantages in delivering the luminosity and spin are described. These features include: electron circulator ring to reduce electron polarized source and energy recovering linac requirements, twisted spin booster and collider ring; interaction points with low beta‐star and crab‐crossing using the short, cooled ion bunches. Accelerator physics and technology issues for both protons/ions and electrons are presented. The feasibility of an integrated fixed target program at 25 GeV and collider program with center of mass energy between 20 and 65 GeV is explored. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664357

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

A new detector designed to enlarge the kinematic range to study the structure functionsF2andFlat the e[27.5GeV] p[920GeV] collider HERA at DESY is presented. The kinematic region of lowxand lowQ2is opened by extending the acceptance of the device to rapidities up to 8. The detector also allows studies of vector meson production and forward jet physics through a symmetric forward‐backward spectrometer arrangement based on silicon tracking stations and silicon‐tungsten calorimetry. GEANT studies detailing the projected capabilities are presented. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1664358

出版商:AIP    

年代:1904

数据来源: AIP