First Rf Test at 4.2k of a 200mhz Superconducting Nb-cu Cavity
نویسندگان
چکیده
A 200MHz single cell elliptical Nb-Cu cavity has been fabricated and tested at 4.2 K and at 2.5 K in a vertical dewar fitted in a radiation shielded pit, 5 m deep and 2.5 m in diameter. The low field reached at 4.2 K. Two multipacting barriers show up at = 3 MV/m and 1 MV/m. Helium processing is effective to reduce field emission and improve accelerating gradients by a factor of as much as 2. reached 11 MV/m at a of . The Q-drop is observed but shows a stronger field dependence as compared to expected Q-slope typical for Nb-Cu cavities.
منابع مشابه
200MHz superconducting RF cavity development for RLAs
Abstract. A 200MHz single-cell superconducting Nb-Cu cavity has been fabricated and tested at 4.2 K and at 2.5 K. The low field Q0 reached 1 5 1010 at 4.2 K. The accelerating gradient (Eacc) reached 11 MV/m at a Q0 of 6 108. Two multipacting barriers show up at Eacc = 3 and 1 MV/m. Helium processing is effective in reducing field emission and improving accelerating gradients. The Q-drop is obse...
متن کاملANALYSIS AND RESULTS OF THE INDUSTRIAL PRODUCTION OF THE SUPERCONDUCTING Nb/Cu CAVITIES FOR THE LEP 2 PROJECT
For the energy upgrade of the Large Electron Positron Collider at CERN, 216 RF superconducting cavities were ordered from three European industrial firms (Ansaldo,Cerca,Siemens/Accel) at the beginning of 1991. These cavities are made of copper (Cu), internally coated with niobium (Nb) according to a procedure developed at CERN. Up to now about 147 of these cavities fulfilling the specifications...
متن کاملNew Methods for Thin Film Deposition and First Investigations of the use of High Temperature Superconductors for Thin Film Cavities
Niobium thin film cavities have shown good and reliable performance for LEP and LHC, although there are limitations to overcome if this technique should be used for new accelerators such as the ILC. New coating techniques like High Power Impulse Magnetron Sputtering (HiPIMS) has shown very promising results and we will report on its possible improvements for Nb thin film cavity performance. Cur...
متن کاملThe Quadrupole Resonator, Construction, Rf System, Field Calculations and First Applications
The quadrupole resonator allows measurement of the RF properties of superconducting (sc) films deposited on disk-shaped metallic substrates. We describe the construction of the apparatus, the brazing and electronbeam welding procedures, the arrangements for compensating mechanical tolerances of samples and for assuring reproducible sample illumination. We explain the special features of the RF ...
متن کامل200mhz Nb-cu Cavities for Muon Acceleration
As a first step toward a muon collider, a neutrino factory is being actively studied. The neutrino factory calls for nearly 500 meters of 200 MHz SRF cavities to provide 7.5 GeV. The desired gradient is in the range of 15 -17 MV/m at a Q of . Nb-Cu is the technology of choice driven mainly by the cost concern. A Cornell/CERN collaboration was established to address the unique challenges imposed...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003