Beam Dynamics Newsletter

The damping-dominated beam dynamics of the CESR storage ring modified to operate in the 1.5-3 GeV energy range impose unique and stringent design specifications on the 1.3-m-long superconducting wiggler magnets which provide the necessary damping. A superferric 7-pole wiggler magnet which meets these design specifications has been designed, built and tested in situ. Studies of finite-element models and particle-tracking simulations have shown that that an 8-pole model of similar design will provide improved consistency in transfer functions when operated at peak fields which differ from the primary design value.

/pdf/design-considerations-for-the-cesr-c-wiggler-magnets-3h0tn8ywst.pdf

Design considerations for the CESR-c wiggler magnets

As we have reported at the last SRF Workshop two years ago, staged transition of the Cornell Electron Storage Ring (CESR) RF System from normal conducting to superconducting was completed in September 1999 with installation of the fourth superconducting B-cell cavity [1]. Since that time the last cavity has been commissioned and RF system has operated stably providing CESR beams with up to 1.13 MW of RF power to support total beam current up to 800 mA. CESR is a symmetric energy ee collider operating in a bunch train mode with CLEO detector studying B meson decays at thte center of mass energy near the Υ(4S) resonance (≈5.3 GeV) [2]. At the same time CESR provides beams for experiments with synchrotron radiation (SR) at the Cornell High-Energy Synchrotron Source (CHESS). CHESS facility operates in a parasitic mode simultaneously with high-energy physics experiments at CLEO. The latest running period lasted nine months ending in June 2001. The emphasis was put on a steady running of the machine aiming to reach integrated luminosity of at least 10 fb. This goal was achieved by delivering of just over 11 fb. The typical total beam current at the start of the fill was 750 mA and typical RF power delivered to beam by one cavity was 280 kW. Beginning in the fall 2001 CESR will run at Υ resonances below Υ(4S), and during machine studies periods at J/Ψ resonances [3]. Eventually, after some hardware modification and upgrade, CESR will be able to operate over the energy range of 1.5 to 5.6 GeV with expected luminosity of 3×10 cms at 1.9 GeV. CLEO and CHESS will then operate in a time-sharing mode of operation. The CESR upgrade includes modification of the RF. Two more superconducting cavities will be added to provide higher total RF voltage for bunch shortening.

Performance of the cesr superconducting rf system and future plans

RF superconductivity has become a major subfield of accelerator science. There has been an explosion in the number of accelerator applications and in the number of laboratories engaged. The first lecture at this meeting of the CAS presented a review of fundamental design principles to develop cavity geometries to accelerate velocity-of-light particles (β = v/c ~ 1), moving on to the corresponding design principles for medium-velocity (medium-β) and low-velocity (low-β) structures. The lecture included mechanical design topics. The second lecture dealt with input couplers, higher-order mode extraction couplers with absorbers, and tuners of both the slow and fast varieties.

/pdf/design-topics-for-superconducting-rf-cavities-and-1mep7eqv52.pdf

Design Topics for Superconducting RF Cavities and Ancillaries

The Synchrotron Radiation Research Center (SRRC) as a third generation light source facility began a major machine upgrade project in 1999. This upgrade will double the synchrotron light intensity operating at beam current of up to 500mA. The higher order mode (HOM) effects induced by the accelerating cavities will be eliminated to guarantee spectral performance. The superconducting 500-MHz cavity of the CESR III design has been selected to replace the existing room temperature accelerating cavities. A turbine-based cryogenic plant will enable the operation of the SRF cavity at 4.5K. Commissioning is scheduled for the summer 2003. This report discusses the overall status of the project. The strategy of developing an in-house SRF capability is emphasized, to provide skilled system maintenance and to long-term reliability of the light source.

Superconducting RF project at the synchrotron radiation research center

We present a detailed design for operation of the Cornell Electron Storage Ring, CESR, in the energy range covering the /spl psi/ resonances and the Charm and Tau thresholds, as well as reaching to the upper Y resonances near 11 GeV. The addition of 18 m of super-ferric wiggler magnets will partially restore low energy beam emittance and damping times. Installation of superconducting quadrupoles in the interaction region and the addition of high performance superconducting RF cavities will enhance performance at all energies. Studies of optics, beam dynamics, wiggler and vacuum system performance, beam stability, and beam-beam effects confirm operation with a luminosity of 3/spl times/ 10/sup 32/ CM/sup -2/ sec/sup -1/ at 1.88 GeV.

/pdf/parameters-for-low-energy-operation-of-cesr-btvt3xidr8.pdf

Parameters for low energy operation of CESR

The CESR luminosity upgrade plan calls for shortening bunch length to 1 cm. Such bunch length can be achieved by installing two more superconducting cavities to increase total RF voltage. The RF system upgrade necessary to accommodate this change is discussed.

/pdf/superconducting-rf-system-upgrade-for-short-bunch-operation-4mnlisl61g.pdf

Superconducting RF system upgrade for short bunch operation of CESR

After the successful CESR beam test of August 1994 the continued development of a superconducting RF system for the CESR luminosity upgrade is in progress at the Laboratory of Nuclear Studies, Cornell University. The system description as well as recent results are presented.

https://epaper.kek.jp/pac97/papers/pdf/3p021.pdf

Development of superconducting RF for CESR

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Parameters for low energy operation of CESR

Superconducting RF system upgrade for short bunch operation of CESR

Development of superconducting RF for CESR