| Autor: |
Conetti, S. Kuzminski, J. Marchionni, A. Statrs, D. Haire, M. Rosati, M. Simard, A. Zioulas, G. Arenton, M. Cox, B. Chen, T.Y. Lai, K.W. Yao, N. Delchamps, S. Mazur, P.O. Murphy, C.T. Rameika, R. Smith, R. Turkot, F. Yang, W. Etemadi, B. Guffey, K. Tucker, W. Fortney, L. Shen, Q. Tesarek, R. Turkington, T. Ioannu, P. Kourkoumelis, C. Koutentakis, I. Manousakis-Katsikakis, A. Pramantiotis, T. Resvanis, L.K. Vassiliou, M. Voulgaris, G. Jenkins, C.M. Jude, D.J. Turnbull, L. Wagoner, D.E. Mao, H. Wang, C. Shen, C.H. Zhang, N. Zhang, X. Rosen, J. Spiegel, L. Tzamarias, S. |
| Jazyk: |
angličtina |
| Rok vydání: |
1989 |
| Popis: |
Three Multiwire Proportional Chambers (MWPC) with high rate capability have been constructed for Fermi National Accelerator Laboratory experiment 705 (Charmonium and Direct Photon production by 7r± , P and p at 300 GeV/c) [1]. Each chamber, with a sensitive area of 308 cm2 consists of three anode planes, wound with 12.5 µm diameter gold-plated Tungsten/Rhenium wire, facing 25 µm graphite-coated kapton cathode planes at a distance of 3 mm. Wire spacing in two of the MWPC (PC-B1 and PC-B2) is 0.75 mm and 1.00 mm in the third one (PC-B3). After a few weeks of running on “Magic Gas” with a beam flux of up to ~ 107 particles/cm2sec, severe damage occurred to the graphite coating. All cathode planes were replaced by aluminized kapton, and the chambers worked successfully for the next 3 months until the end of the run, when a 10% efficiency drop was observed after a total accumulated charge of ~1 C/cm of sense wire. After the end of the run the chambers were disassembled and inspected. A white deposit with a characteristic “wire pattern” etched away from the Al coating was observed in the region of the beam spot. © 1989 IEEE |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
