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An electron knocks loose a compact version of a quark- antiquark pair that cruises through a nucleus transparent to it.

Research Activities of Prof. Jerry Gilfoyle

My research is focused on the experimental program at the Thomas Jefferson National Accelerator Laboratory to explore the quark-gluon nature of matter with an excursion into nuclear arms policy. I have also developed inquiry-based laboratories for introductory physics and undergraduate quantum mechanics. The nuclear physics research is supported by the US Department of Energy (grant DE-FG02-96ER40980).

A Russian nuclear missile sub is dismantled by the US cooperative threat reduction program.

Here are some links to background material about my research and some teaching stuff.

An introduction to nuclear and particle physics, the structure of the deuteron, the CLAS detector, and our local program at Richmond. Here is also some useful information on kinematics, units, etc, cross sections, the Linux operating system [1, 2], a Root primer and my group's webpage.
Jefferson Lab is where I do my experiments. Some recent highlights are here.
I am part of a large, international collaboration that built and maintains one of the major detectors at JLab called CLAS.
I have been involved in science policy over the last few years as a scientific consultant for the Advanced Systems and Concepts Office of the Defense Threat Reduction Agency, US Department of Defense.
The website for calculating radiative corrections for the reaction d(e(pol),e'p)n is here.
The homepage for the Richmond Physics supercomputing cluster is here and the poster is here.
Some samples of discovery-based, introductory physics laboratories are here and here in PostScript format.
An example of the computational labs I use in quantum mechanics is here.

The links here are to published papers, scientific reports, seminars, and some news articles.

Renewal proposal submitted to the US Department of Energy's Nuclear Physics Program on November 20, 2008 is here.
Research introduction presented in the Gottwald auditorium November 18, 2008 is here.
Preprint of paper on our measurement of the magnetic form factor of the neutron is here.
Nuclear Physics Working Group Report presented at the plenary session of the CLAS Collaboration meeting November 1, 2008 is here.
The CLAS Analysis Note 2008-103 entitled A high precision measurement of the neutron magnetic form factor using the CLAS detector was approved October 1, 2008.
Poster presented at the Gordon Conference on Photonuclear Reactions in Tilton, New Hampshire, August 10-15, 2008 is here and some pictures.
Nuclear Physics Working Group Report presented at the plenary session of the CLAS Collaboration meeting May 31, 2008 is here.
Update on the analysis of the G_Mⁿ measurement using the ratio method in CLAS presented in the plenary session of the CLAS Collaboration meeting May 29, 2008 is here.
Kirill Dergachev's Senior thesis was on "CLAS 12 Simulation Analysis and Optimization".
Invited talk 'Review of QCD Processes in Nuclear matter at Jefferson Lab' presented at the XVI Workshop on Deep Inelastic Scattering and Related Subjects' in London, England along with a summary and the proceedings. (April 8, 2008).
Annual report submitted to DOE is here. (February 13, 2008).
Computing cluster proposal submitted to the NSF Major Research Instrumentation program is here. (January 23, 2008).
Kuri Gill is one of my students graduating this year (2008) who worked with me on simulations of the CLAS detector for our analysis of deuteron electrodisintegration.
Slides for a panel on academic careers at the headquarters of the American Association for the Advancement of Science, Decmber 6, 2007 are here.
Nuclear Physics Working Group Report presented at the plenary session of the CLAS Collaboration meeting Nov 2, 2007 is here.
Talk on homeland security presented to the Brandermill/Midlothian/Wood Lake Lion's Club, November 8, 2007 is here.
Short research introduction given at Richmond on October 30, 2007 and another presentation for Con Beausang's nuclear physics course on October 23, 2007.
Invited talk given as part of the Conference Experience for Undergraduates program at the fall, 2007 meeting of the Division of Nuclear Physics of the APS is here along with some pictures.
Student poster by Kirill Dergachev presented at the fall, 2007 DNP meeting is here.
Talk on Nuclear Physics at the University of Richmond presented at the American School of Madagascar, September 12, 2007, Antananarivo, Madagascar.
Talk on Measuring Form Factors and Structure Functions with CLAS presented to HEPMAD07, September 11, 2007 in Antananarivo, Madagascar. The proceedings are here.
Talk on the proposal entitled Measurement of the Neutron Magnetic Form Factor at High Q2 Using the Ratio Method on Deuterium presented to JLab PAC32, August 7, 2007.
Beam time proposal entitled Measurement of the Neutron Magnetic Form Factor at High Q2 Using the Ratio Method on Deuterium submitted to the JLab PAC as part of the 12-GeV Upgrade program, June 20, 2007. Approved August 8, 2007.
Talk on the beam time proposal entitled Measurement of the Neutron Magnetic Form Factor at High Q2 Using the Ratio Method on Deuterium, plenary session, CLAS Collaboration meeting June 12, 2007.
Nuclear Physics Working Group Report presented at the plenary session of the CLAS Collaboration meeting June 14, 2007 is here.
Invited talk entitled A High-Precision Measurement of G_Mⁿ with CLAS presented at the Workshop on Exclusive Reactions at High Momentum Transfer (JLab, May 21-24, 2007). The proceedings is here.
The Hall-B, 12-GeV Upgrade Workshop was held at JLab May 14-15, 2007. I gave an overview of the CLAS12 reconstruction progress and the software report.
One of my students, Kristen Greenholt, was a Physics/Political Science double major. I was on the review committee for her Political Science thesis here. See below for her physics thesis.
Proposal submitted to the National Science Foundation's program on Explosives and Related Threats on May 2, 2007 is here.
Two of my research students, Kristen Greenholt and Rusty Burrell, are graduating this year (2007). Their senior theses were written on their work with me on hadronic fiducial cuts and simulations of the D(e,e'p)n reaction.
The CLAS12 tracking system was reviewed in Feb, 2007 here.
Proposal submitted to the National Science Foundation's Major Research Instrumentation Program on January 25, 2007 is here.
Talk on homeland security presented to the 5400 Club at the Jewish Community Center, January 15, 2007 is here.
Renewal proposal submitted to the US Department of Energy's Nuclear Physics Program on November 13, 2006 is here.
Contributed talk at the fall, 2006 DNP meeting is here along with two posters presented by my students Kristen Greenholt and Rusty Burrell and Kuri Gill.
Proposal submitted to the National Science Foundation Nuclear Physics Program is here submitted September 27, 2006.
Proposal submitted to the Defense Universities Research Instrumentation Program, Army Research Office, is here with the budget justification here.
Letter of intent to measure the magnetic form factor of the neutron submitted July 7, 2006 to the JLab PAC30 is here.
Proposal to measure quark propagation and fragmentation in cold nuclear matter submitted July 7, 2006 to the JLab PAC30 is here.
Progress report on measurements of the fifth structure function of the deuteron presented at the Nuclear Physics Working Group meeting during the CLAS Collaboration meeting March 3, 2006.
CLAS technical report (CLAS-Note 2005-022)entitled 'Radiative Corrections for Deuteron Electrodisintegration' can be found here.
Two of my students presented posters at the Fall, 2005 DNP meeting of the American Physical Society in Maui, Hawaii. Kristen Greenholt's poster is here and Rusty Burrell's is here.
Nuclear Physics Working Group report presented at the plenary session of the CLAS Collaboration meeting June 18, 2005.
Progress report on the fifth structure function of the deuteron presented at the Nuclear Physics Working Group meeting during the CLAS Collaboration meeting June 17, 2005.
Science policy talk given to the Physics Department at Virginia Commonwealth University, April 22, 2005.
Two of my students presented posters at the April, 2005 meeting of the American Physical Society in Tampa, Florida. Kristen Greenholt's poster is here and Rusty Burrell's is here.
Progress report is here on electrodisintegration of the deuteron presented at the Nuclear Physics Working Group meeting during the CLAS Collaboration meeting Feb 25, 2005.
Grant renewal proposal for the US Department of Energy is here submitted November 22, 2004.
Science policy talk given to the Physics Department at Idaho State University, October 5, 2004.
Presentation to a joint Math/Physics seminar at the University of Richmond, September 22, 2004.
Short presentation to the University of Richmond Interdisciplinary Science Seminar Series, September 22, 2004.
Webpage describing the radiative corrections used for the E5 running period at JLab along with copies of the code is here. A talk from the June, 2004 CLAS Collaboration meeting is here.
CLAS Approved Analysis presentation at the plenary session of the CLAS Collaboration Meeting, November 13, 2003. The written version is here.
Measurement of Polarized Structure Function sigma(LT') for p(e(vec),e'p)pi0 from single pi0 electroproduction in the Delta resonance region, K. Joo, et al. (The CLAS Collaboration), Physical Review C, Rapid Communications, 68, 032201 (2003).
Study of the Delta(1232) using single and double polarization asymmetries, A. Biselli, et al. (The CLAS Collaboration), Physical Review C 68, 035202 (2003).
Public lecture on weapons of mass destruction presented as part of Union College's Perspectives at the Nott Memorial series, October 15, 2003.
Science policy seminar presented at the Union College Department of Physics, October 15, 2003.
Nuclear Physics seminar presented at the University of Richmond Department of Physics, September 29, 2003.
We have developed our own laboratory manual for introductory physics at the University of Richmond. Somes samples of the material are here for the fall and spring semesters in PostScript format.
Presentation to the Multihadron Working Group during the CLAS Collaboration Meeting, July 25, 2003.
Observation of Nuclear Scaling in the A(e,e') Reaction at x_Bjorken > 1, K.Egiyan, et al. (The CLAS Collaboration), Physical Review C 68, 014313, (2003).
Our collaboration at JLab (CLAS) has discovered a new form of matter containing five quarks instead of the usual two or three. It's called the pentaquark.
A link to the recent work of the American Physics Society's Task Force on Countering Terrorism including a short piece I wrote about `Swarm Intelligence'.
When is nothing really something? Find out here.
Measurement of ep -> e'p π⁺ π^- and baryon resonance analysis, Physical Review Letters 91 022002, (2003), M. Ripani, et al. (The CLAS Collaboration) - The cross section for the reaction ep ® e' p π⁺ π^- was measured in the resonance region for 1.4 < W < 2.1 GeV and 0.5 < Q² < 1.5 GeV²/c², using the CLAS detector at Jefferson Laboratory.Data shows resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N^* and Δ states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P₁₃(1720) resonance or by introducing a new baryon state, not reported in published analyses.
Measurement of Inclusive Spin Structure Fuctions of the Deuteron with CLAS, J. Yun, et al. (The CLAS Collaboration), The Physical Review C, 67, 055204 (2003) - We report the results of a new measurement of the spin structure functions of the deuteron in the region of moderate momentum transfer (Q² = 0.27 - 1.3 (GeV²)) and final hadronic state mass in the resonance region (W = 1.08 - 2.0 GeV). We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target (¹⁵ND₃) and detected the scattered electrons with the CEBAF Large Acceptance Spectrometer (CLAS). From our data, we extract the longitudinal double spin asymmetry A_|| and the spin structure function g₁^d. Our data are generally in good agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function g₁^d and study its approach to both the deep inelastic limit and large Q² and to the Gerasimov-Drell-Hearn sum rule at the real photon limit (Q² ® 0). We find that the first moment varies rapidly in the Q² range of our experiment and crosses zero around Q² ~ 0.65 (GeV/c)², indicating the dominance of the Δ resonance at these momentum transfers.
The CEBAF Large Acceptance Spectrometer, Nuclear Instruments and Methods 503/3, 513 (2003), B. Mecking, et al., A collaboration of 34 institutions has assembled the CEBAF Large Accceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A program of about 60 experiments will use this detector to study structures and interactions of mesons, nucleons, and nuclei using polarized and unpolarized electron and photon probes. A six-coil toroidal super-conducting magnet provides the magnetic field necessary to determine the momenta of charged particles as they are tracked using drift chambers. Cherenkov counters, time-of-flight scintillators and electromagnetic calorimeters provide particle identification. Fast triggering and high data acquisition rates allow operation at luminocities of 10³⁴/cm²/s.
First Measurement of Transferred Polarization in the Exclusive e(pol)p -> e'K+Lambda(pol) Reaction, D. Carman, et al. The CLAS Collaboration Physical Review Letters 90, 131804 (2003). The first measurements of the transferred polarization for the exclusive e(pol)p -> e'K+Lambda(pol) reaction have been performed in Hall B at the Thomas Jefferson National Accelerator Facility using the CLAS spectrometer. A 2.567 GeV electron beam was used to measure the hyperon polarization over a range of Q2 from 0.3 to 1.5 (GeV/c)2, W from 1.6 to 2.15 GeV, and over the full center-of-mass angular range of the K+ meson. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. Contrary to the expectations of the widely used 3P0 model of open-flavor hadron strong decays, our data suggest that the intermediate state s-sbar quark pair is produced with spins anti-aligned.
This is a compressed PostScript file from my CLAS Collaboration talk on out-of-plane measurements of deuteron electrodisintegration (Feb 28, 2003).
A Complete Measurement of the F2 Proton Structure Function in the Resonance Region and the Evaluation of the Moments, M. Osipenko, et al. (The CLAS Collaboration), Physical Review D 67, 092001 (2003). We measured the inclusive electron-proton cross section in the nucleon resonance region (W < 2.5 GeV) at momentum transfers Q^2 below 4.5 (GeV/c)^2 with the CLAS detector. The large acceptance of CLAS allowed for the first time the measurement of the cross section in a simultaneously wide, two-dimennsional range of Q^2 and x, making it possible to perform an integration of the data at fixed Q^2 over the whole significant x-interval. From these data, we extracted the F2 structure function and studied the Q^2 evolution of its moments, Mn(Q^2), in order to estimate higher twist contributions. The statistical and systematic uncertainties of th JLAB data allow a precise extraction of the higher twists and therefore accurate theoretical predictions of the latter are now called for to allow a meaningful comparison.
This is a brochure (in pdf format) for a pair of recent talks at the Science Museum of Virginia along with the talks (1,2).
An essay about my experiences as a AAAS Defense Policy Fellow is here.
Photoproduction of the omega meson on the proton at large mementum transfer by Marco Battaglieri, et al., (the CLAS Collaboration), Physical Review Letters 90, 022002 (2003). The differential cross section, d sigma/dt, for omega meson exclusive photoproduction on the proton above the resonance region (2.6 < W < 2.9 GeV) was measured up to a momentum transfer -t = 5 GeV^2 using the CLAS detector at Jefferson Laboratory. The omega channel was identified by detecting proton and pi+ in the final state and using missing mass technique. While the low momentum transfer region shows the typical diffreation pattern expected from Pomeron and Reggion-exchange, at large -t the differential cross section has a flat behavior. This feature can be explanied introducing quark interchange processes, beside the QCD-inspired two-gluon exchange.
I was recently a member of the Task Force on Countering Terrorism of the American Physics Society described here and here.
eta photoproduction on the proton for photon energies from 0.75 to 1.95 GeV M. Dugger, et al., (The CLAS Collaboration) Phys. Rev. Lett. 89, 222002 (2002) Differential cross sections for the reaction gamma p -> eta p have been measured with a tagged photon beam for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified through missing mass reconstruction using kinematical information for the protons scattered in the production process. The data provide the first extensive angular distribution measurements for the process above W = 1.75 GeV. Comparison with preliminary results from a constituent quark model support the suggestion that a third S11 resonance with mass ~1.8 GeV couples to the (eta N) channel.
We have developed our own laboratory manual for introductory physics at the University of Richmond. Somes samples of the material are here for the fall and spring semesters in PostScript format.
First Measurement of the Double Spin Asymmetry in e(pol)p(pol) -> e'pi+n in the Resonance Region, . DeVita, et al. (The CLAS Collaboration), Phys. Rev. Lett. 88, 082001 (2002) The first measurement of the double spin asymmetry for exclusive single pi+ electroproduction from protons has been performed in Hall-B at the Thomas Jefferson National Accelerator Facility using CLAS. A 2.6-GeV polarized electron beam was incident on a polarized solid NH3 target. The double spin asymmetry Aep was measured in the resonance region for a range of momentum transfer squared, 0.35 < Q2 < 1.5 GeV2, and for a range of pi+ center-of-mass polar angle, 0.25 < cos(thetacm) < 1. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistant with a faster rise with Q2 of the helicity asymmetry A1 for the F15(1680) resonance than expected from the analysis of the unpolarized data.
Two articles about my work in DTRA are in the newsletter of the American Association for the Advancement of Science here and in the journal Nature.
"Loose Nukes: Fissile Material Security in Russia", colloquium presented at the Institute for Nuclear and Particle Physics, Ohio University, Athens, OH, April 3, 2002.
Successful proposal to the Major Research Instrumentation (MRI) program at the National Science Foundation for a supercomputing cluster.
Observation of exclusive deeply virtual Compton scattering in polarized electron beam asymmetry measurements Physical Review Letters 87, 182002 (2001) S. Stepanyan et al. (The CLAS Collaboration) We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.
"Science in the Public Interest: The AAAS Science and Engineering Fellowships", Conference on Science for the Public Good, Virginia Commonwealth University, Richmond, VA, June 1, 2001 (ps format).
Using Nuclear Materials to Prevent Nuclear Proliferation - Study performed during 1999-2000 as a Defense Policy Fellow for the American Association for the Advancement of Science, Science and Global Security, 9, 81 (2001). A Word version of the paper is here, a PDF version is here, and a one-page summary of the work is here.
Electroproduction of the Lambda(1520) Hyperon , Physical Review, C64, 044601 (2001). S. Barrow et al (The CLAS Collaboration) Abstract: The reaction ep --> e' K+ Lambda(1520) with Lambda(1520) --> p' K- was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cos(theta_K+), phi_K+, Q^2, and W dependencies of Lambda(1520) electroproduction are presented for the kinematic region 0.9 < Q^2 < 2.4 GeV^2 and 1.95 < W < 2.65 GeV. Also, the Q^2 dependence of the Lambda(1520) decay angular distribution is presented for the first time. The cos(theta_K+) angular distributions suggest t-channel diagrams dominate the production process. Fits to the Lambda(1520) t-channel helicity frame decay angular distributions indicate the m_z = +- 1/2 parentage accounts for about 60% of the total yield, which suggests this reaction has a significant contribution from t-channel processes with either K+ or longitudinal coupling to an exchanged K*. The Q^2 dependence of the Lambda(1520) production cross section is the same as that observed for Lambda(1116) photo- and electroproduction.
Exclusive electroproduction of phi mesons at 4.2 GeV. Physical Review C 63, 065205-1 (2001). K. Lukashin, et al (The CLAS Collaboration) We studied the exclusive reaction e p --> e' p' phi using the phi --> K^+ K^- decay mode. The data were collected using a 4.2 GeV incident electron beam and the CLAS detector at Jefferson Lab. Our experiment covers the range in Q^2 from 0.7 to 2.2 GeV^2, and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of phi production on the proton. Our measurement shows the expected decrease of the t-slope with the vector meson formation time c Delta tau below 2 fm. At = 0.6 fm, we measure b_phi = 2.27 +- 0.42 GeV^-2. The cross section dependence on W as W^{0.2+-0.1} at Q^2 = 1.3 GeV^2 was determined by comparison with phi production at HERA after correcting for threshold effects. This is the same dependence as observed in photoproduction.
The ep --> e'p(eta) reaction at and above the S11(1535) baryon resonance , Physical Review Letters 86, 1702 (2001). R. Thompson, et al (The CLAS Collaboration) New cross sections for the reaction ep-->e'p(eta) are reported for the total center of mass energy W = 1.5 - 1.86 GeV and invariant momentum transfer Q^2 = 0.25 - 1.5 (GeV/c)^2. This large kinematic range allows extraction of important new information about response functions, photocouplings, and (eta)N coupling at W ~ 1.7 GeV; this is shown to come from interference between S and P waves and can be interpreted in terms of known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
Seminar talk, fall, 2000 and others 1, 2, 3, 3b (ps format)
Photoproduction of phi(1020) Mesons on the Proton at Large Momentum Transfer. Physical Review Letters 85, 4682 (2000). - E. Anciant, et al (The CLAS Collaboration), The cross-section for phi meson photoproduction on the proton has been measured for the first time up to a four-momentum transfer t = -4 GeV^2, using the CLAS detector at at Thomas Jefferson National Accelerator Facility. At low four-momentum transfer, the differential cross section is well-described by Pomeron exchange. At large four-momentum transfer, above -t = 1.8 GeV^2, the data support a model where the Pomeron is resolved into its simplest component, two gluons, which may couple to any quark in the proton and in the phi.
The CLAS Drift Chamber System, NIM A449 (2000) 81. , M.D. Mestayer, D.S. Carman, B. Asavapibhop, F.J. Barbosa, P. Bonneau, S.B. Christo, G.E. Dodge, T. Dooling, W.S. Duncan, S.A. Dytman, R. Feuerbach, G.P. Gilfoyle, V. Gyurjyan, K.H. Hicks, R.S. Hicks, C.E. Hyde-Wright, G. Jacobs, A. Klein, F.J. Klein, M.V. Kossov, S.E. Kuhn, R.A. Magahiz, R.W. Major, C. Martin, T. McGuckin, J. McNabb, R.A. Miskimen, J.A. Mueller, B.B. Niczyporuk, J. O'Meara, L.M. Qin, B.A. Raue, J. Robb, F. Roudot, R.A. Schumacher, D.J. Tedeschi, R.A. Thompson, D. Tilles, W. Tuzel. VanSyoc, M.F. Vineyard, L.B. Weinstein, G.R. Wilkin, A. Yegneswaran, J. Yun, Experimental Hall B at Jefferson Laboratory houses the CEBAF Large Acceptance Spectrometer, the magnetic field of which is produced by a superconducting toroid. The six coils of this toroid divide the detector azimuthally into six sectors, each of which contains three large multi-layer drift chambers for tracking charged particles produced from a fixed target on the toroidal axis. Within the 18 drift chambers are a total of 35,148 individually instrumented hexagonal drift cells. The novel geometry of these chambers provides for good tracking resolution and efficiency, along with large acceptance. The design and construction challenges posed by these large-scale detectors are described, and detailed results are presented from in-beam measurements.
Archiving in Physics - Instructions for backing up data on some of the Physics Department computers.
Simulations of lambda(1520) Electroproduction - Initial stages of an undergraduate project to test the new computer cluster in the University of Richmond Physics Department. The results will be used to generate the acceptance for the CLAS for electrodproduction of the lambda(1520) baryon measured during the e1 running period.
Elastic Peak Monitoring for the CLAS - Presentation by Dave Vermette at the XIV Meeting of the International Society of Physics Students held in Helsinki, Finland in August, 1999. The abstract is here.
Time Histories Status - Update of time histories project presented at the June, 1999 CLAS Collaboration meeting. It is also available as a compressed (with gzip) postscript file here.
Time Histories - Project to make the results of online recsis analysis automatically available on the web during experiments at Jefferson Laboratory (January, 1999).
Measuring/Monitoring Tmax and Tmin. Talk presented at the CLAS tracking workshop, November, 1998.
A New Teaching Approach to Quantum Mechanical Tunneling. Paper presented at the 1998 Conference on Computational Physics in Granada, Spain. A copy of the transparencies is here.
Online version of RECSIS
CEBAF
The CEBAF Large Acceptance Spectrometer (CLAS)
Electroproduction of the f₀(975) Scalar Meson (Experiment 89-043)
Effects of Discrete Ionization in the CLAS Drift Chambers (ps format)
Spatial Resolution of the Nose Cone Prototype Drift Chamber (ps format)
Data Definitions for the CLAS Drift Chambers (ps format)
Drift Velocity Calibration of the CLAS (ps format)
3-2 contacts

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