TY - JOUR
TI - Performance of 0.75 mm pitch mwpc's operating at high rate
AU - Conetti, S.
AU - Kuzminski, J.
AU - Marchionni, A.
AU - Statrs, D.
AU - Haire, M.
AU - Rosati, M.
AU - Simard, A.
AU - Zioulas, G.
AU - Arenton, M.
AU - Cox, B.
AU - Chen, T.Y.
AU - Lai, K.W.
AU - Yao, N.
AU - Delchamps, S.
AU - Mazur, P.O.
AU - Murphy, C.T.
AU - Rameika, R.
AU - Smith, R.
AU - Turkot, F.
AU - Yang, W.
AU - Etemadi, B.
AU - Guffey, K.
AU - Tucker, W.
AU - Fortney, L.
AU - Shen, Q.
AU - Tesarek, R.
AU - Turkington, T.
AU - Ioannu, P.
AU - Kourkoumelis, C.
AU - Koutentakis, I.
AU - Manousakis-Katsikakis, A.
AU - Pramantiotis, T.
AU - Resvanis, L.K.
AU - Vassiliou, M.
AU - Voulgaris, G.
AU - Jenkins, C.M.
AU - Jude, D.J.
AU - Turnbull, L.
AU - Wagoner, D.E.
AU - Mao, H.
AU - Wang, C.
AU - Shen, C.H.
AU - Zhang, N.
AU - Zhang, X.
AU - Rosen, J.
AU - Spiegel, L.
AU - Tzamarias, S.
JO - IEEE Transactions on Nuclear Science
PY - 1989
VL - 36
TODO - 1
SP - 112-116
PB - 
SN - 0018-9499, 1558-1578
TODO - 10.1109/23.34415
TODO - Graphite;  Photons;  Protons, Fermi National Accelerator Laboratory Experiment 705;  Multiwire Proportional Chambers, Proportional Counters
TODO - 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
ER -