TM 972 1670.000 THE BUCKING COIL AN （TM 972 1670.000的反磁线圈）.pdf

TM- 972 1670.000 THE BUCKING COIL - AN IMPROVEMENT FOR DIPOLE ROOM TEMPERATURE MEASUREMENTS S.Wolff May 27, 1980 1. INTRODUCTION During the production of Tevatron dipoles the room temper- ature measurement of field harmonics plays an important role. As it is a long way from a collared coil to a com- plete magnet, it is essential to get information about the field quality of the produced coils and even about the field quality expected in the complete magnet at liquid helium temperature, as soon as possible so that corrections can be made in the production line or at an individual mag- net early enough. Therefore, the room temperature measure- ments establish a kind of feedback loop in the production line. The quality of this feedback loop depends on the ac- curacy and reproducibility of these room temperature mea- surements and on the amount of correlation between them and the measuring results obtained at liquid helium temperature. In the following chapters the room temperature measuring procedure used up to now is described briefly. Starting from that procedure, improvements are discussed and a new type of measurem