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

With the installation of the first SRF cavity in September of 1997, the upgrade of the CESR RF system has begun. This cavity belongs to the new generation of so-called HOM damped cavities designed for high current storage rings. The upgrade is proceeding by replacing one by one old copper cavities with superconducting ones during short machine shutdowns. CESR continues to demonstrate spectacular performance. It operates with 36 bunches in 9 trains of 4 bunches in each beam with total beam current up to 550 mA at the start of fills for high energy physics. In the course of last year both peak luminosity and integrated luminosity per day increased by 67% and are equal now to 8.0/spl times/10/sup 32/ cm/sup -2/ s/sup -1/, and 40.2 pb/sup -1//day. The latter number corresponds roughly to 43 thousands of B mesons per day. The first superconducting cavity has been in operation in CESR since October of 1997. The cavity operates at accelerating gradients up to 7 MV/m and delivers to the beam maximum RF power of 220 kW through the ceramic window, the record value for superconducting cavities. We found that pulsed power processing without beam is extremely helpful in improving RF window performance. The maximum HOM power extracted from the beam by one cavity is 5.7 kW. Four single-cell HOM damped cavities will eventually support a total beam current of 1 A. Because of the very low impedance of superconducting cavity module, we calculate the longitudinal instability threshold from cavity HOMs to be in excess of 1 A. The second cavity was installed in CESR during October '98 shutdown. The third cavity is already installed in CESR, and its commissioning will start immediately after this conference. The fourth cryomodule is being assembled and is schedule for installation in summer of 1999.

/pdf/the-high-luminosity-performance-of-cesr-with-the-new-43t4s4xm95.pdf

The high luminosity performance of CESR with the new generation superconducting cavity

A software package has been created for examining the thermal behavior of cryogenic particle accelerator structures. It models the steady state heat flows in waveguides and beampipes while in operation, treating both diffuse and specular infrared reflection. The programs runs effectively on small computers, since only a few simple geometries are treated, and the output display options are limited. Overall accuracy for simple test cases is on the order of a few percent, but on short structures with very wide apertures the errors can be up to 10%. An analysis of radiative heat load in the B-factory cavity is presented, and thermal management strategies for the input waveguide are discussed. >

Thermal modeling of cryogenic accelerator structures

The authors describe the cryostat development for the superconducting CESR-B cavity beam test. They describe external beamline components, the tuner, instumentation and control. >

https://epaper.kek.jp/p93/pdf/pac1993_0995.pdf

Cryostat for a beam test with the CESR-B cavity

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Cryostat for a beam test with the CESR-B cavity