An advanced rotating T-R mapping and its diagnoses of TESLA 9-cell superconducting cavity

Author

Shu, Q.S. ; Deppe, G. ; Moeller, W.-D. ; Pekeler, M. ; Proch, D. ; Renken, D. ; Stein, P. ; Stolzenburg, C. ; Junquera, T. ; Caruette, A. ; Fouaidy, M.

Author_Institution

DESY, Hamburg, Germany

Volume

3

fYear

1995

fDate

1-5 May 1995

Firstpage

1639

Abstract

An advanced rotating temperature and radiation mapping has been developed for investigation of field emission and thermal breakdown of TESLA 9-cell superconducting cavities in superfluid He. More than 10,000 spots on cavity surfaces can be investigated in one turn with 5° angular stepping. We locate a heated area with maximum ΔT=3.3 K around the 5th cell´s equator. A heat flux density of 5 W/cm² in the region ΔT=3 K and total heat power Q~100 W going to LHe from the area were calculated. An emitter responsible for the heating was identified at the iris area (So=8 cm) of the same cell according to T-maps associated with a simulation of impacting electron trajectories. The cavity reached Eacc=20 MV/m. We briefly introduce the technical layout, experimental data and analysis results

Keywords

X-ray detection; accelerator cavities; electron accelerators; linear accelerators; linear colliders; superconducting cavity resonators; temperature measurement; TESLA 9-cell superconducting cavity; X rays; advanced rotating radiation mapping; advanced rotating temperature mapping; field emission; heat flux density; iris; superfluid He; thermal breakdown; total heat power; Arm; Cables; Electric breakdown; Helium; Iris; Iron; Photodiodes; Radio frequency; Rotation measurement; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505312

Filename

505312