Title :
Comparison of the predicted and measured loss factor of the superconducting cavity assembly for the CESR upgrade
Author :
Belomestnykh, S. ; Hartung, W. ; Kirchgessner, J. ; Moffat, D. ; Muller, H. ; Padamsee, H. ; Veshcherevich, V.
Author_Institution :
Lab. of Nucl. Studies, Cornell Univ., Ithaca, NY, USA
Abstract :
Superconducting cavities have been chosen to replace the existing copper cavities for the future upgrade of CESR. The use of superconducting cavity modules, specially designed for a high current collider, allows us to lower the cavity impedance and the loss factor of the accelerating system and thereby increase the threshold for multi- and single-bunch instabilities. The loss factor has been measured in a beam test using calorimetric method; we measure the water temperature rise and the flow rate of the cooling water for a higher order mode load. To measure the loss factor vs. bunch length (10 to 25 mm), we used two different sets of CESR optics and different RF voltages. The experimental data points are in a good agreement with predicted values
Keywords :
accelerator RF systems; accelerator cavities; calorimetry; electron accelerators; loss measurement; losses; storage rings; superconducting cavity resonators; 10 to 25 mm; CESR upgrade; RF voltage; bunch length; calorimetric method; cooling water; flow rate; higher order mode; loss factor measurement; superconducting cavity; water temperature; Acceleration; Cooling; Copper; Fluid flow measurement; Impedance; Loss measurement; Optical losses; Radio frequency; Temperature measurement; Testing;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505893
