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| MOOPMA04 | Crab Cavity Development | vacuum, superconductivity, dipole, monitoring | 36 | ||||
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Tow superconducting crab cavities, witch will be installed in the KEKB accelerator, is being assembled. The KEKB (KEK B-factory) is a double-ring, asymmetric-energy, high luminosity electron-positron colliding accelerator with a finite angle beam crossing. A purpose of the crab cavities is to deflect the beam-bunch with time-varying RF fields, and to provide the head-on collision at the interaction point (crab crossing scheme). The head-on collision will drastically increase luminosity. The crab cavity is required to have high RF fields (kick voltage) to provide beam-bunch deflection. This mode (crab mode, 509 MHz) is not the lowest order mode (LOM) of the cavity. In order to damp the LOM as well as the HOMs, a coaxial coupler is attached along the beam pipe. Two crab cavities have been fabricated and tested in a vertical cryostat. These cavities have already achieved the required kick voltage. One cavity was recently tested with high RF power in a cryomodule. After some conditioning, this cavity has achieved the required kick voltage. The test revealed some modifications were needed. After improvements, the cavity will be ready for installation.
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| TUXMA02 | Record Luminosities at the Tevatron & Future Potentiality | collider, proton, antiproton, target | 51 | ||||
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Fermilab Collider Run II has been in progress for nearly six years. During this tine the D0 and CDF experiments have each acquired total integrated luminosities of nearly 2.2 fb-1. Also during this time the peak instantaneous luminosities increased by more than a factor of 25 ' from 10 to as high as 270 ×1030 cm-2 s-1. An aggressive collider upgrade program continues to make significant progress in conjunction with luminosity production operations. This paper will give the status of Tevatron operations and expectations for the remainder of Run II.
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| TUXMA03 | Next Generation Electron-Ion Colliders | electron, ion, collider, proton | 56 | ||||
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The next generation of electron-ion colliders is expected to deliver much higher luminosity, a high degree of polarization of both the leptons and hadrons, multiple interaction points and large ratios of beam energies as compared to the first end only such collider, HERA. Energy Recovery Linacs (ERLs) have significant potential uses as providers of lepton beams for colliders in High Energy Physics and Nuclear Physics. We describe plans for these colliders which are under development by various laboratories and the technology issues that are associated with these applications. The advantages of ERLs for these applications are numerous and will be outlined in the text. It is worth noting that some of these advantages are the high-brightness of the ERL beams and their relative immunity to beam-beam disturbances.
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| TUZMA01 | RHIC Status | polarization, electron, proton, ion | 74 | ||||
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As the first hadron accelerator and collider consisting of two independent superconducting rings RHIC has operated with a wide range of beam energies and particle species. Machine operation and performance will be reviewed that includes high luminosity gold-on-gold and copper-on-copper collisions at design beam energy (100 GeV/u), asymmetric deuteron-on-gold collisions as well as high energy polarized proton-proton collisions (100 GeV on 100 GeV) with beam polarization of up to 65%. Plans for future upgrades of RHIC will also be discussed.
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| TUPMA006 | Study on the BEPCII Lattice | lattice, dynamic-aperture, injection, synchrotron | 109 | ||||
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BEPCII, the upgrading project of the Beijing Electron-Positron Collider (BEPC), has been designed with a luminosity of 1033 cm-2s-1 at the -charm energy region. According to the beam-beam simulation results, the luminosity of BEPCII with a crossing collision angle of 11 mrad is about 0.50×1033 cm-2s-1 with the original operation mode at the working point of 6.53/5.58. To increase the operating luminosity of the BEPCII, a low momentum compaction factor (?P) collision mode has been studied which can increase the luminosity to 0.54×1033 cm-2s-1. If the bunch length of the low ?P mode is reduced from 1.5 cm to 1.2 cm, a mode with vertical beta function at IP equal to 1.2 cm could push the luminosity to 0.828×1033 cm-2s-1 at the working points 6.53/5.56. Also, the BEPCII synchrotron radiation mode is optimized to get a larger dynamic aperture and much more stable tunes.
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| TUPMA008 | Status of the VEPP-4M Electron-Positron Collider | monitoring, lepton, collider, controls | 112 | ||||
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Since 2004, the principal high-energy physics experiment carried out at the VEPP-4M electron-positron collider is precise measurement of the tau-lepton mass. Moreover, a series of experiments to improve measurement accuracy of the J/psi, psi(2s) and psi(3770) mesons has been performed. During all the high-energy physics experiments, absolute calibrations of beam energy by the resonant depolarization method and routine energy monitoring using the Compton back-scattering technique were realized. Monitoring of beam energy spread, which is also important, was implemented using several techniques. To provide the VEPP-4M high performance, some investigation and further development of the machine have been done, the most important results are described.
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| TUPMA064 | ILC Activity at JINR and Siting in Dubna Region | power-supply, linear-collider, collider, electron | 202 | ||||
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JINR actively participates in ILC project. JINR physicists are planning to take part in several fields of activity in ILC: works on photo injector prototype, participation in design and construction of cryomodules, laser metrology, etc. Moreover Joint Institute is full-member pretender for possible hosting of ILC in the region near Dubna. International intergovernmental status of JINR, comfortable location of site, well developed infrastructure, geological, climate and relief conditions may become powerful advantages of Dubna siting among other proposals of ILC location. All above mentioned topics are discussed in the presented report.
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| WEXMA01 | Status of KEKB and Upgrade Plan to SuperKEKB | electron, positron, linac, klystron | 280 | ||||
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The KEKB is an electron-positron two-ring collider for the leading B meson factory. It consists of an 8 GeV electron ring (HER) and a 3.5 GeV positron ring (LER) and their injector linac. It has been operated since December 1998, and has recently marked the peak luminosity of 16.52 /nb/s. This peak luminosity is obtained under the crab-ready beam optics having the robust operating condition by some efforts to solve the optics problems. The integrated luminosity has also recently exceeded 1.2 /fb /day under the continuous injection mode. We are aiming more luminosity improvement after the crab cavity installation. Further the major upgrade plan for SuperKEKB is expected to achieve 400 /nb/s keeping the baseline of the original proposal and another upgrade plans are also considered towards over 1000 /nb/s based on the recent beam-beam simulation. This paper describes the recent status of KEKB and upgrade plans for SuperKEKB.
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| WEXMA02 | The BEPCII: Construction and Initial Commissioning | linac, cryogenics, positron, vacuum | 285 | ||||
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As a natural extension of the Beijing Electron-Positron Collider (BEPC), the BEPCII project has started its construction since the beginning of 2004. The BEPCII will operate in beam energy of 1-2.1 GeV, its design luminosity is 1*1033cm-2s-1 at 1.89 GeV with double-ring structure. The upgraded collider will also serve as a synchrotron radiation source with higher beam energy and intensity than the BEPC. Some key technologies, such as superconducting RF system, low impedance vacuum devices, superconducting micro-beta quadrupoles, etc. are developed. The injector linac reached its design specification by the summer of 2006. Most storage ring components have been manufactured, installed and tested. The final checkout of the storage ring subsystems is underway. For the delay of the cryogenic and high current test of the superconducting quadrupoles, the commissioning of the storage rings will be started with normal magnets in the interaction region in autumn of 2006. The project is scheduled to complete in 2008. This paper will present the updated status and preliminary commissioning results of the BEPCII.
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* For the BEPCII team |
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| THXMA02 | Linear Accelerator Designs for the Upgrade of the CERN Proton Injector Complex (Linac4, SPL) | linac, injection, proton, ion | 529 | ||||
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Looking beyond the commissioning of the LHC, which is expected to start at the end of 2007, CERN is setting up its scientific plan for the years to come. The concerns about the reliability of the old LHC injectors and the need to progressively remove the technical bottlenecks towards higher luminosity in the LHC have initiated a reflection on the design of the main elements of the LHC injection chain. A plan under consideration foresees in the years 2007-2010 the construction of a 160 MeV H− linear accelerator, Linac4, injecting into the old 1.4 GeV PS Booster (PSB). In a second stage, the PSB could be replaced by a superconducting linac, the SPL, at an energy between 3.5 and 5 GeV. The Proton Synchrotron (PS) would be in turn replaced by a new PS2 reaching a higher energy of 50 GeV. Linac4 and SPL can operate at a higher duty cycle than needed for LHC injection, allowing functioning as a high-intensity facility for neutrino or radioactive ion physics at a later stage. This paper describes the design of the two linear accelerators involved in this upgrade strategy, Linac4 and SPL, and outlines some results of the R&D programme aimed at preparing the construction of Linac4.
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| FRYMA01 | Experiences With The Hera Lepton-Proton Collider | proton, lepton, electron, resonance | 842 | ||||
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A review of the experience of operating the HERA lepton proton collider with a high luminosity of up to 5∙1031cm-2s-1, a discussion of the important accelerator physics issues and a summary of the most important physics results of the lepton-hadron (ep) collider HERA is presented.
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