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27 results on '"Va'vra J"'

1. Photon background in DIRC fused silica bars

Author

Yarritu, A., Spanier, S., and Va'vra, J.

Subjects
Signal detection (Electronics) -- Methods, Cherenkov counters -- Design and construction, Cherenkov radiation -- Analysis, Photoelectric multipliers -- Testing, Business, Electronics, Electronics and electrical industries
Abstract

The detection of internally reflected Cherenkov (DIRC) radiation is the ring imaging Cherenkov detector of the BABAR detector at the Pep-II ring of SLAC. The Cherenkov radiators consist of 4.9-m-long rectangular fused silica bars each glued together from four equal pieces. The photon detector is a water tank equipped with an array of 10752 conventional photomultipliers. The current study attempts to identify sources of photonic background generated in the DIRC bars. A conclusion of this work is that there are two major sources: one such component consists of photons created by the delta-ray electrons in the fused silica. The second component comes from the reflections of photons from the EPOTEK-301-2 glue-fused silica interface while they are traveling in the bars. The reflection occurs because of a slight mismatch of the refraction indexes. Index Terms--Cherenkov detectors, photomuitipliers, signal detection, simulation software.

Published
2002

2. Operational experience with the DIRC detector

Author

Adam, I., Aleksan, R., Aston, D., Bernard, D., Bonneaud, G., Bourgeois, P., Brochard, F., Brown, D.N., Chauveau, J., Cohen-Tanugi, J., Convery, M., Emery, S., Ferrag, S., Gaidot, A., Haas, T., Hadig, T., de Monchenault, G. Hamel, Hast, C., Hoecker, A., Kadel, R.W., Kadyk, J., Krishnamurthy, M., Lacker, H., London, G.W., Lu, A., Lutz, A.-M., Mancinelli, G., Mayer, N., Meadows, B.T., Mir, L.M., Muller, D., Ocariz, J., Ofte, I., Plaszczynski, S., Pripstein, M., Ratcliff, B.N., Roos, L., Schune, M.-H., Schwiening, J., Shelkov, V., Sokoloff, M.D., Spanier, S., Stark, J., Telnov, A.V., Thiebaux, C., Vasileiadis, G., Vasseur, G., Va'vra, J., Verderi, M., Wenzel, W.A., Wilson, R.J., Wormser, G., Yeche, C., Yellin, S., and Zito, M.

Subjects
Radiation warning systems -- Testing, Business, Electronics, Electronics and electrical industries
Abstract

The DIRC, a novel type of Cherenkov ring imaging device, is the primary hadronic particle identification system for the BABAR detector at the asymmetric B-factory, PEP-II at Stanford Linear Accelerator Center. It is based on total internal reflection and uses long, rectangular bars made from synthetic fused silica as Cherenkov radiators and light guides. BABAR began taking data with colliding beams in late spring 1999. This paper describes the performance of the DIRC during the first 2.5 years of operation. Index Terms--DIRC, Cherenkov detector, particle identification system, particle identification (PID), BABAR.

Published
2002

3. Resistive plate chamber performance in the BaBar IFR system

Author

Anulli, F., Bagnasco, S., Baldini, R., Band, H.R., Bionta, R., Brau, J.E., Brigljevic, V., Buzzo, A., Calcaterra, A., Carpinelli, M., Cartaro, C., Cavallo, N., Crosetti, G., de Sangro, R., De Nardo, G., Eichenbaum, A., Fabozzi, F., Falciai, D., Ferrarotto, F., Ferroni, F., Finocchiaro, G., Forti, F., Frey, R., Gatto, C., Grauges, E., Iwasaki, M., Johnson, J.R., Lange, D.J., Lista, L., Lo Vetere, M., Lu, C., Macri, M., Messner, R., Moore, T.B., Morganti, S., Neal, H., Neri, N., Palano, A., Paoloni, E., Paolucci, P., Passaggio, S., Pastore, F., Patteri, P., Peruzzi, I., Piccolo, M., Piccolo, D., Piredda, G., Robutti, E., Roodman, A., Santroni, A., Sciacca, C., Sinev, N.B., Strom, D., Soha, A., Tosi, S., Va'vra, J., Wisniewski, W.J., Wright, D.M., Xie, Y., and Zallo, A.

Subjects
Radiation warning systems -- Testing, Business, Electronics, Electronics and electrical industries
Abstract

The BaBar Collaboration has operated a system covering over 2000 [m.sup.2] with resistive plate chambers for nearly three years. The chambers are constructed of bakelite sheets separated by 2 mm. The inner surfaces are coated with linseed oil. This system provides muon and neutral hadron detection for BaBar. Installation and commissioning were completed in 1998, and operation began mid-1999. While initial performance of the system reached design, over time, a significant fraction of the resistive plate chambers demonstrated significant degradation, marked by increased currents and reduced efficiency. A coordinated investigative effort has identified many of the elements responsible for the degradation. Index Terms--Gas discharge, particle tracking, radiation detectors.

Published
2002

4. BaBar DIRC electronics front-end chain

Author

Bailly, P., Beigbeder, C., Bernier, R., Breton, D., Bonneaud, G., Caceres, T., Chase, R., Chauveau, J., Del Buono, L., Dohou, F., Ducorps, A., Gastaldi, G., Genat, J.F., Hrisoho, A., Imbert, P., Lebbolo, H., Matricon, P., Oxoby, G., Renard, C., Roos, L., Sen, S., Thiebaux, C., Truong, K., Tocut, V., Vasileidis, G., Va'Vra, J., Verderi, M., Warner, D., Wilson, R.J., Wormser, G., Zhang, B., and Zomer, F.

Subjects
Real-time data processing -- Analysis, Photodetectors -- Analysis, Cherenkov radiation -- Analysis, Photoelectrons -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

The Front-End electronics of the Detector of Internally Reflected Cerenkov light (DIRC) for the BaBar experiment is presented. Its aim is to measure to better than 1ns the arrival time of Cerenkov photoelectrons, detected in a 11,000 phototubes array and their amplitude spectra. It mainly comprises 64-channel DIRC Front-End Boards (DFB) equipped with eight full-custom Analog Chips performing zero-cross discrimination with 2 mV threshold and pulse shaping, four full-custom Digital TDC chips for timing measurements with 500 ps binning and a readout logic selecting hits in the trigger window, and DIRC Crate Controller cards (DCC) serializing the data collected from up to 16 DFBs onto a 1.2 Gb/s optical link. Extensive test results of the pre-production chips will be presented, as well as system tests.

Published
1998

5. The performance of the barrel CRID at the SLD; long-term operational experience

Author

Abe, K., Ashford, V., Aston, D., Bienz, T., Baird, K., Bird, F., Cavalli-Sforza, M., Coller, J., Coyle, P., Coyne, D., Dasu, S., Dunwoodie, W., Dima, M., Hallewell, G., Yasegawa, Y., Iwasaki, Y., Kalelkar, M., Kawahara, H., Leith, W.G.S., Lu, A., Meadows, B., Muller, D., McCulloch, M., McShurley, D., Nagamine, T., Narita, S., Oxoby, G., Pavel, T.J., Plano, R., Ratcliff, B., Reif, R., Rensing, P., Schneider, M., Schultz, D., Shapiro, S., Shaw, H., Simopoulos, C., Staengle, H., Stamer, P., Stiles, P., Toge, N., Va'vra, J., Weber, T., Whitaker, J.S., Wilson, R.J., Williams, D., Williams, S.H., Willocq, S., and Yellin, S.

Subjects
Detectors -- Research, Electrons -- Research, Cherenkov counters -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The Barrel CRID detector has been operating successfully at SLD for the past seven years. It is an important tool for SLD physics analyses. We report results based on long term operational experience of a number of important quantities such as the Cherenkov quality factor, [N.sub.0], of the device, fluid transparency, electron lifetime, single electron detection efficiency, anode wire ageing, TMAE purity, long term stability of the gas refraction index, liquid radiator transparency, Cherenkov angle resolution and the number of photoelectrons observed per ring.

Published
1998

6. An internally reflecting Cherenkov detector (DIRC): properties of the fused silica radiators

Author

Adam, I., Aleksan, R., Aston, D., Bailly, P., Beigbeder, C., Benayoun, M., Benkebil, M., Bonneaud, G., Breton, D., Briand, H., Brown, D. Noppe, J.-M., Bourgeois, Ph. Oshatz, D., Chauveau, J. Oxoby, G., Cizeron, R. Plano, R., Cohen-Tanugi, J. Plaszczynski, S., Convery, M. Pripstein, M., David, P. Rasson, J., Vaissiere, C. de la Ratcliff, B., Lesquen, A. de Reif, R., Buono, L. del Renard, C., Fouque, G. Roos, L., Gaidot, A. Roussot, E., Gastaldi, F. Sarazin, X., Genat, J.-F. Schune, M.-H., Gosset, L. Schwiening, J., Hale, D. Sen, S., Monchenault, G. Hamel de Shelkov, V., Hamon, O. Sokoloff, M., Kadel, R. Staengle, H., Kadyk, J. Stiles, P., Karolak, M. Stone, R., Kawahara, H. Thiebaux, Ch., Krueger, H. Truong, K., Lebbolo, H. Toki, W., Leruste, P.H. Vasileiadis, G., Le Diberder, F. Vasseur, G., London, G. Va'vra, J., Long, M. Verderi, M., Lory, J. Versille, S., Lu, A. Warner, D., Lutz, A.-M. Weber, T., Lynch, G. Weber, T.F., McCulloch, M. Wenzel, W., McShurley, D. Wilson, R., Malchow, R. Wormser, G., Matricon, P. Yeche, Ch., Mayer, B. Yellin, S., Meadows, B. Zhang, B., and Narjoux, J.-L. Zito, M.

Subjects
Cherenkov counters -- Research, Nuclear counters -- Research, Business, Electronics, Electronics and electrical industries, Stanford Linear Accelerator Center -- Research
Abstract

The DIRC, a new type of ring-imaging Cherenkov detector that images internally reflected Cherenkov light, is being constructed as the main hadronic particle identification component of the BABAR detector at SLAC. The device makes use of 5 meter long fused silica (colloquially called quartz) bars, which serve both as the Cherenkov radiators and as light pipes for transmitting the light to an array of photo-multiplier tubes. This paper describes a program of research and development aimed at determining whether bars that meet the stringent requirements of the DIRC can be obtained from commercial sources. The results of studies of bulk absorption of fused silica, surface finish, radiation damage and bulk inhomogeneities are discussed.

Published
1998

7. The DIRC Front-end Electronics Chain for BaBar

Author

Bailly, P., Beigbeder, C., Bernier, R., Breton, D., Bonneaud, G., Caceres, T., Chase, R., Chauveau, J., Del Buono, L., Dohou, F., Ducorps, A., Gastaldi, F., Genat, J.F., Hrisoho, A., Imbert, P., Lebbolo, H., Matricon, P., Oxoby, G., Renard, C., Roos, L., Sen, S., Thiebaux, C., Truong, K., Tocut, V., Vasileiadis, G., Va'Vra, J., Verderi, M., Warner, D., Wilson, R.J., Wormser, G., Zhang, B., and Zomer, F.

Subjects
Nuclear research -- Observations, Photoelectrons -- Measurement, Business, Electronics, Electronics and electrical industries
Abstract

Recent results from the Front-End electronics of the Detector of Internally Reflected Cerenkov light (DIRC) for the BaBar experiment at SLAC (Stanford, USA) are presented. It measures to better than 1ns the arrival time of Cerenkov photoelectrons detected in a 11,000 phototubes array and their amplitude spectra. It mainly comprises 64-channel DIRC Front-End Boards (DFB) equipped with eight full-custom analog chips performing zero-cross discrimination with 2 mV threshold and pulse shaping, four full-custom digital time to digital chips (TDC) for timing measurements with 500 ps binning and a readout logic selecting hits in the trigger window, and DIRC Crate Controller cards (DCC) serializing the data collected from up to 16 DFBs onto a 1.2 Gb/s optical link. Extensive test results of the pre-production chips will be presented, as well as system tests.

Published
2000

8. Particle Identification Using the dE/dx and the Cherenkov Light Detection Methods in High Energy Physics

Author

Va'vra, J.

Subjects
Nuclear research -- Observations, Particles -- Identification and classification, Business, Electronics, Electronics and electrical industries
Abstract

This paper deals with two particle identification methods: dE/dx and Cherenkov detection. The dE/dx method is the most common technique used in conjunction with tracking in gaseous detectors. We systematically compare existing dE/dx data with various predictions available in the literature and judge the overall consistency. To my knowledge, this comparison was not done to date. There are two Cherenkov light emission detection techniques: the threshold and the Ring imaging methods. We want to discuss the recent trend in these techniques.

Published
2000

9. First year operational experience with the Cherenkov detector (DIRC) of BABAR

Author

Adam, I., primary, Aleksan, R., additional, Aston, D., additional, Benkebil, M., additional, Bernard, D., additional, Bonneaud, G., additional, Brochard, F., additional, Brown, D.N., additional, Chauveau, J., additional, Cohen-Tanugi, J., additional, Convery, M., additional, David, P., additional, de Domenico, G., additional, de Lesquen, A., additional, Emery, S., additional, Ferrag, S., additional, Gaidot, A., additional, Geld, T., additional, Hamel de Monchenault, G., additional, Hamon, O., additional, Hoecker, A., additional, Kadel, R.W., additional, Kadyk, J., additional, Kalelkar, M., additional, Le Diberder, F., additional, London, G.W., additional, Lu, A., additional, Lutz, A.-M., additional, Lynch, G., additional, Mancinelli, G., additional, Martinez-Vidal, F., additional, Meadows, B.T., additional, Plano, R., additional, Plaszczynski, S., additional, Pripstein, M., additional, Ratcliff, B.N., additional, Roos, L., additional, Roussot, E., additional, Salnikov, A., additional, Schune, M.-H., additional, Schwiening, J., additional, Shelkov, V., additional, Sokoloff, M.D., additional, Spanier, S., additional, Stark, J., additional, Telnov, A.V., additional, Thiebaux, Ch., additional, Valassi, A., additional, Vasileiadis, G., additional, Vasseur, G., additional, Va'vra, J., additional, Verderi, M., additional, Wilson, R.J., additional, Wormser, G., additional, Yeche, Ch., additional, Yellin, S., additional, and Zito, M., additional

Published
2000
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10. The endcap Cherenkov ring imaging detector at SLD

Author

Abe, K., primary, Antilogus, P., additional, Aston, D., additional, Baird, K., additional, Baltay, C., additional, Bean, A., additional, Ben-David, R., additional, Bienz, T., additional, Bird, F., additional, Caldwell, D.O., additional, Cavalli-Sforza, M., additional, Coller, J., additional, Coyle, P., additional, Coyne, D., additional, Dima, M., additional, Dolinsky, S., additional, d'Oliveira, A., additional, Duboscq, J., additional, Dunwoodie, W., additional, Hallewell, G., additional, Hasegawa, K., additional, Hasegawa, Y., additional, Huber, J., additional, Iwasaki, Y., additional, Jacques, P., additional, Johnson, R.A., additional, Kalelkar, M., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D.G.W.S., additional, Liu, X., additional, Lu, A., additional, Manly, S., additional, Martinez, J., additional, Mathys, L., additional, Mchugh, S., additional, Meadows, B., additional, Muller, G., additional, Muller, D., additional, Nagamine, T., additional, Nussbaum, M., additional, Pavel, T.J., additional, Plano, R., additional, Ratcliffe, B., additional, Rensing, P., additional, Santha, A.K.S., additional, Schultz, D., additional, Sen, S., additional, Shank, J.T., additional, Shapiro, S., additional, Simopoulos, C., additional, Snyder, J., additional, Sokoloff, M.D., additional, Solodov, E., additional, Stamer, P., additional, Stockdale, I., additional, Suekane, F., additional, Toge, N., additional, Turk, J., additional, Va'vra, J., additional, Weber, T., additional, Whitaker, J.S., additional, Williams, D.A., additional, Williams, S.H., additional, Willocq, S., additional, Wilson, R.J., additional, Word, G., additional, Yellin, S., additional, and Yuta, H., additional

Published
1995
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11. Results from the SLD barrel CRID detector

Author

Abe, K., primary, Antilogus, P., additional, Aston, D., additional, Baird, K., additional, Bean, A., additional, Ben-David, R., additional, Bienz, T., additional, Bird, F., additional, Caldwell, D.O., additional, Cavalli-Sforza, M., additional, Coller, J., additional, Coyle, P., additional, Coyne, D., additional, Dasu, S., additional, Dolinsky, S., additional, D'Oliveira, A., additional, Duboscq, J., additional, Dunwoodie, W., additional, Hallewell, G., additional, Hasegawa, K., additional, Hasegawa, Y., additional, Huber, J., additional, Iwasaki, Y., additional, Jacques, P., additional, Johnson, R.A., additional, Kalelkar, M., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D.W.G.S., additional, Liu, X., additional, Lu, A., additional, Manly, S., additional, Martinez, J., additional, Mathys, L., additional, McHugh, S., additional, Meadows, B., additional, Muller, G., additional, Muller, D., additional, Nagamine, T., additional, Nussbaum, M., additional, Pavel, T.J., additional, Plano, R., additional, Ratcliff, B., additional, Rensing, P., additional, Santha, A.K.S., additional, Schultz, D., additional, Shank, J.T., additional, Shapiro, S., additional, Simopoulous, C., additional, Snyder, J., additional, Sokoloff, M.D., additional, Solodov, E., additional, Stamer, P., additional, Stockdale, I., additional, Suekane, F., additional, Toge, N., additional, Turk, J., additional, Va'vra, J., additional, Whitaker, J.S., additional, Williams, D.A., additional, Williams, S.H., additional, Willocq, S., additional, Wilson, R.J., additional, Word, G., additional, Yellin, S., additional, and Yuta, H., additional

Published
1994
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12. The fluid systems for the SLD Cherenkov Ring Imaging Detector

Author

Abe, K., primary, Antilogus, P., additional, Aston, D., additional, Baird, K., additional, Bean, A., additional, Ben-David, R., additional, Bienz, T., additional, Bird, F., additional, Caldwell, D.O., additional, Cavalli-Sforza, M., additional, Coller, J., additional, Coyle, P., additional, Coyne, D., additional, Dasu, S., additional, Dolinsky, S., additional, d'Oliveira, A., additional, Duboscq, J., additional, Dunwoodie, W., additional, Gagnon, P., additional, Hallewell, G., additional, Hasegawa, K., additional, Hasegawa, Y., additional, Huber, J., additional, Iwasaki, Y., additional, Jacques, P., additional, Johnson, R.A., additional, Kalelkar, M., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D.W.G.S., additional, Liu, X., additional, Lu, A., additional, Manly, S., additional, Martinez, J., additional, Mathys, L., additional, McCulloch, M., additional, McHugh, S., additional, McShurley, D., additional, Muller, G., additional, Muller, D., additional, Nagamine, T., additional, Nussbaum, M., additional, Pavel, T.J., additional, Peterson, H., additional, Plano, R., additional, Ratcliff, B., additional, Reif, R., additional, Rensing, P., additional, Santha, A.K.S., additional, Schneider, M., additional, Schultz, D., additional, Shank, J.T., additional, Shapiro, S., additional, Shaw, H., additional, Simopoulos, C., additional, Snyder, J., additional, Sokoloff, M.D., additional, Solodov, E., additional, Stamer, P., additional, Stockdale, I., additional, Suekane, F., additional, Toge, N., additional, Turk, J., additional, Va'vra, J., additional, Watt, R., additional, Weber, T., additional, Whitaker, J.S., additional, Williams, D.A., additional, Williams, S.H., additional, Wilson, R.J., additional, Word, G., additional, Yellin, S., additional, and Yuta, H., additional

Published
1993
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13. Performance of the SLD barrels CRID during the 1992 physics data run

Author

Abe, K., primary, Antilogus, P., additional, Aston, D., additional, Baird, K., additional, Bean, A., additional, Ben-David, R., additional, Bienz, T., additional, Bird, F., additional, Caldwell, D.O., additional, Cavalli-Sforza, M., additional, Coller, J., additional, Coyle, P., additional, Coyne, D., additional, Dasu, S., additional, Dolinsky, S., additional, d'Oliveira, A., additional, Duboscq, J., additional, Dunwoodie, W., additional, Hallewell, G., additional, Hasegawa, K., additional, Hasegawa, Y., additional, Huber, J., additional, Iwasaki, Y., additional, Jacques, P., additional, Johnson, R.A., additional, Kalelkar, M., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D.W.G.S., additional, Liu, X., additional, Lu, A., additional, Manly, S., additional, Martinez, J., additional, Mathys, L., additional, McHugh, S., additional, Meadows, B., additional, Muller, G., additional, Muller, D., additional, Nagamine, T., additional, Nussbaum, M., additional, Pavel, T.J., additional, Plano, R., additional, Ratcliff, B., additional, Rensing, P., additional, Santha, A.K.S., additional, Schultz, D., additional, Shank, J.T., additional, Shapiro, S., additional, Simopoulos, C., additional, Snyder, J., additional, Sokoloff, M.D., additional, Solodov, E., additional, Stamer, P., additional, Stockdale, I., additional, Suekane, F., additional, Toge, N., additional, Turk, J., additional, Va'vra, J., additional, Whitaker, J.S., additional, Williams, D.A., additional, Williams, S.H., additional, Wilson, R.J., additional, Word, G., additional, Yellin, S., additional, and Yuta, H., additional

Published
1993
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14. Initial performance of the SLD Cherenkov ring imaging detector system

Author

Abe, K., primary, Antilogus, P., additional, Aston, D., additional, Baird, K., additional, Bean, A., additional, Bienz, T., additional, Bird, F., additional, Caldwell, D., additional, Cavalli-Sforza, M., additional, Coyle, P., additional, Coyne, D., additional, Dasu, S., additional, Dolinsky, S., additional, d'Oliveira, A., additional, Duboscq, J., additional, Dunwoodie, W., additional, Gagnon, P., additional, Hallewell, G., additional, Hasegawa, K., additional, Huber, J., additional, Jacques, P., additional, Johnson, R.A., additional, Kalelkar, M., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D.W.G.S., additional, Liu, X., additional, Lu, A., additional, Martinez, J., additional, Mathys, L., additional, McHugh, S., additional, Meadows, B., additional, Muller, D., additional, Nagamine, T., additional, Nussbaum, M., additional, Pavel, T.J., additional, Plano, R., additional, Ratcliff, B., additional, Rensing, P., additional, Santha, A.K.S., additional, Schultz, D., additional, Shapiro, S., additional, Shoup, A., additional, Simopoulos, C., additional, Sokoloff, M., additional, Solodov, E., additional, Stamer, P., additional, Stockdale, I., additional, Suekane, F., additional, Toge, N., additional, Va'vra, J., additional, Whitaker, J.S., additional, Williams, D.A., additional, Williams, S.H., additional, Witherell, M., additional, Wilson, R.J., additional, Word, G., additional, Yellin, S., additional, and Yuta, H., additional

Published
1992
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15. Performance of the front end electronics and data acquisition system for the SLD Cherenkov ring imaging detector

Author

Abe, K., primary, Antilogus, P., additional, Aston, D., additional, Baird, K., additional, Bean, A., additional, Bienz, T., additional, Bird, F., additional, Caldwell, D., additional, Cavalli-Sforza, M., additional, Coyle, P., additional, Coyne, D., additional, Dasu, S., additional, Dolinsky, S., additional, d'Oliveira, A., additional, Duboscq, J., additional, Dunwoodie, W., additional, Gagnon, P., additional, Hallewell, G., additional, Hasegawa, K., additional, Hoeflich, J., additional, Huber, J., additional, Jacques, P., additional, Johnson, R.A., additional, Kalelkar, M., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D.W.G.S., additional, Liu, X., additional, Lu, A., additional, Marshall, D., additional, Martinez, J., additional, Mathys, L., additional, McHugh, S., additional, Meadows, B., additional, Muller, D., additional, Nagamine, T., additional, Nussbaum, M., additional, Oxoby, G., additional, Pavel, T.J., additional, Plano, R., additional, Ratcliff, B., additional, Rensing, P., additional, Santha, A.K.S., additional, Schultz, D., additional, Shapiro, S., additional, Shoup, A., additional, Simopoulos, C., additional, Sokoloff, M.D., additional, Solodov, E., additional, Stamer, P., additional, Stiles, P., additional, Stockdale, I., additional, Suekane, F., additional, Toge, N., additional, Va'vra, J., additional, Whitaker, J.S., additional, Williams, D.A., additional, Williams, S.H., additional, Witherell, M., additional, Wilson, R.J., additional, Word, G., additional, Yellin, S., additional, and Yuta, H., additional

Published
1992
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16. Cherenkov Ring Imaging Detector front-end electronics

Author

Antilogus, P., primary, Aston, D., additional, Bienz, T., additional, Bird, F., additional, Dasu, S., additional, Dunwoodie, W., additional, Hallewell, G., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D., additional, Marshall, D., additional, Muller, D., additional, Nagamine, T., additional, Oxoby, G., additional, Ratcliff, B., additional, Rensing, P., additional, Schultz, D., additional, Shapiro, S., additional, Simopoulos, C., additional, Solodov, E., additional, Stiles, P., additional, Suekane, F., additional, Toge, N., additional, Va'vra, J., additional, Williams, S., additional, Wilson, R.J., additional, Whitaker, J.S., additional, Bean, A., additional, Caldwell, D., additional, Duboscq, J., additional, Huber, J., additional, Lu, A., additional, Mathys, L., additional, McHugh, S., additional, Morrison, R., additional, Witherell, M., additional, Yellin, S., additional, Coyle, P., additional, Coyne, D., additional, Spencer, E., additional, d'Oliveria, A., additional, Johnson, R.A., additional, Martinez, J., additional, Nussbaum, M., additional, Santha, A.K.S., additional, Shoup, A., additional, Stockdale, I., additional, Jacques, P., additional, Plano, R., additional, Stamer, P., additional, Abe, K., additional, Hasegawa, K., additional, and Yuta, H., additional

Published
1991
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17. Construction and testing of the SLD Cerenkov Ring Imaging Detector

Author

Cavalli-Sforza, M., primary, Coyle, P., additional, Coyne, D., additional, Gagnon, P., additional, Williams, D.A., additional, Zucchelli, P., additional, Whitaker, J.S., additional, Wilson, R.J., additional, Bean, A., additional, Caldwell, D., additional, Duboscq, J., additional, Huber, J., additional, Lu, A., additional, Mathys, L., additional, McHugh, S., additional, Morrison, R., additional, Witherell, M., additional, Yellin, S., additional, Johnson, R.A., additional, Martinez, J., additional, Meadows, B., additional, Nussbaum, M., additional, Santha, A.K.S., additional, Shoup, A., additional, Stockdale, I., additional, Jacques, P., additional, Plano, R., additional, Stamer, P., additional, Antilogus, P., additional, Aston, D., additional, Bienz, T., additional, Bird, F., additional, Dasu, S., additional, Dunwoodie, W., additional, Hallewell, G., additional, Kawahara, H., additional, Kwon, Y., additional, Leith, D., additional, Muller, D., additional, Nagamine, T., additional, Pavel, T., additional, Ratcliff, B., additional, Rensing, P., additional, Schultz, D., additional, Shapiro, S., additional, Simopoulos, C., additional, Solodov, E., additional, Toge, N., additional, Va'vra, J., additional, Williams, S., additional, Abe, K., additional, Hasegawa, K., additional, Suekane, F., additional, and Yuta, H., additional

Published
1990
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18. Single Electron Amplification in a "Single-MCP + Micromegas + Pads" Detector.

Author

Va'vra, J. and Sumiyoshi, T.

Subjects
*RADIOACTIVITY, *DETECTORS, *ELECTRODES, *MAGNETIC fields, *PARTICLES (Nuclear physics), *PHOTOCATHODES
Abstract

We have tested a new gaseous detector structure based on a tandem of two parts, the first one is a single MCP plate (sometimes called the Microchannel plate or capillary plates), and the second one is a Micromegas with pad readout. The new detector responds very well to a single electron signal, both in helium-based and argon-based gases, and it can reach a very large gain. Our overall aim is to couple the proposed electrode structure to a Bialkali photocathode. The main advantage of this avenue of research is that such a detector would operate easily in a very large magnetic field, and it could achieve excellent position resolution and large pixelization, compared to existing vacuum-based MCP-PMT detectors. [ABSTRACT FROM AUTHOR]

Published
2004
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19. Attempt to Correlate the Ionic Model With Observations in BaBar RPC Chambers and R&D Tests.

Author

Va'vra, J.

Subjects
*VEGETABLE oils, *SYNTHETIC gums & resins, *MATHEMATICAL models, *LINSEED oil, *CONDUCTION electrons, *DETECTORS, *FATTY acids
Abstract

The paper presents a model of ionic conduction in the Bakellte-based RPC detectors. This model explains why these detectors need to add water while they operate. The electrode current, according to the presented model, is formed mainly by the ionic sequence involving the phenol impurities left in the Bake. lite and water, both left from the initial production. Similar ionic process is present in the Linseed oil polymer, where the current is carried by the fatty acid molecular impurities and by water. The Bakelite RPC operation requires the entire ionic sequence to operate smoothly to keep the electrode resistance constant. [ABSTRACT FROM AUTHOR]

Published
2004
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27. Progress report on the SLD cerenkov ring imaging detector

Author

Ashford, V., Bienz, T., Bird, F., Crawford, G., Gaillard, M., Hallewell, G., Leith, D., Kwon, Y., McShurley, D., Nuttall, A., Oxoby, G., Ratcliff, B., Reif, R., Schultz, D., Shaw, H., Shapiro, S., Solodov, E., Toge, N., Va'Vra, J., Williams, S., Bauer, D., Caldwell, D., Lu, A., Yellin, S., Cavalli-Sforza, M., Coyle, P., Coyne, D., Spencer, E., Johnson, R., Meadows, B., and Nussbaum, M.

Published
1981
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