[en] This report contains papers from the 1993 Particle Accelerator Conference. This 5th of 5 volumes contains papers on the following topics: multiparticle beam dynamics; hadron and e-p colliders and hadron synchrotrons; and vacuum technology. These papers have been cataloged and indexed separately elsewhere

[en] The Fermilab collider program has entered its first physics run with two major detectors, CDF and D0. Recent results on the performance of the accelerators are presented, along with plans to improve the luminosity of the collider. The peak luminosity routinely exceeds the goal of 5x10³⁰ cm^-2sec^-1, and the integrated luminosity routinely exceeds 1 pb^-1 per week to each detector. The Tevatron has been successfully upgraded to include electrostatic separators which provide helical orbits which overcome the beam-beam tune shift limitations of previous runs by only allowing bunch crossing at the two detectors. The installation of two matched low beta inserts in the Tevatron has allowed for the simultaneous operation of two luminosity interaction regions. The Antiproton Source has increases its performance over the previous run as measured by stack size and stacking rate. The Linac will be upgraded from 200 MeV to 400 MeV in order to lessen the space charge tune shift upon injection into the Booster. Additional improvements to the Antiproton Source are required to meet the luminosity projections. Higher luminosity requires more bunches in the Tevatron in order to keep the number of interactions per bunch crossing acceptably small. The present plan is to increase the number of bunches from 6 to 36 per beam. Until it is replaced with the Main Injector, the Main Ring will remain as the most significant bottleneck on the performance of the collider

[en] The Tevatron Collider at Fermilab is the world's highest energy hadron collider, colliding protons with antiprotons at a center of mass energy of 1800 GeV. At present six proton bunches collide with six antiproton bunches to generate luminosities of up to 9 x 10³⁰ cm^-2s^-1. It is estimated that to reach luminosities significantly greater than 10³¹ cm^-2s^-1 while minimizing the number of interactions per crossing, the number of bunches will have to be inceased. Thirty-six bunch operation looks like the most promising plan. This paper looks at the strategies for increasing the number of particle bunches, the new hardware that needs to be designed and changes to the operating mode in filling the Tevatron. An interactive program which simulates the filling of the Tevatron collider is also presented. The time scale for multibunch operation and progress towards running greater than six bunches is given in this paper

[en] A high gradient standing wave linear accelerator provides axisymmetric transverse focusing due to the presence of strong alternating gradient transverse electromagnetic fields arising from the backward rf wave. This effect is second order in both the field amplitude and in γ^-1, so it is of importance only for high gradient, relatively low energy beams. The purpose of the present analysis is to examine the effect of this focusing on multi-bunch beam breakup in a superconducting linear collider, which has both a high accelerating gradient and long bunch train. As an interesting test case, the authors discuss the beam breakup problem in the TESLA test bed at DESY

[en] The location of a liner inside the collider beam tube is being studied at the SSC Laboratory, in order to provide a synchrotron radiation intercept and to help enhance the vacuum. There will be wake fields propagating inside the liner following the beam fields incident on the pumping holes/slots on the liner. The effect of the wake fields may be expressed through coupling impedances. This paper describes a method to evaluate the longitudinal coupling impedance of slots/holes on the liner for a large range of frequencies (0-60 GHz)

[en] Insertion device performance is limited by the minimum magnet gap allowed by storage ring beam dynamics. In this note, the authors analyze the impedance of the vacuum chamber for the prototype small-gap undulator being built for the NSLS X-ray ring, and discuss the consequent beam instability thresholds

[en] The coupling impedance of a single slot in a thick wall beam pipe was measured. The slot dimension is small compared to the wavelength of interest. The measurements were done by the wire method with the synthetic pulse technique. Gating technique was also applied to obtain the reflection response for a structure that does not have appropriate calibration standards. The measured results are in good agreement with calculated impedance using analytical formulae given by other authors

[en] It is known that the electromagnetic field caused by a moving charge depends on its acceleration. Therefore, if a bunch of charged particles has a circular trajectory, the self fields in the bunch depend on the radius of curvature. The authors will treat these self fields analytically for a one-dimensional bunch, using the Lienard-Wiechert potentials. These depend on the retarded positions of the charges in the bunch. They will show that one only has to determine these positions explicitly for the endpoints of the bunch. The one-dimensional model predicts non-zero tangential and radial forces in the middle of the bunch which depend on its angular width and on its angular velocity. Expressions for these forces are presented. A comparison between the power loss due to coherent radiation and the tangential force exerted on the central electron of the bunch shows that there is a definite relation between these quantities

[en] The author has simulated the proton transport of the 6-kA, 1-MV GAMBLE II experiment using a modified version of the IPROP particle-in-cell code. IPROP now uses a hybrid model in which plasma electrons are divided into high-energy macro particle and thermal-fluid components. This model includes open-quotes knock-onclose quotes bound-electron collision and runaway sources for high-energy electrons. Using IPROP, the authors has calculated net currents in reasonable agreement with the experiment ranging from 5-11% of the total current in pressures from 0.25-4 torr helium. In the simulations, the pinch current sample by the 1.5-cm beam was 2-3 times larger than the net current at 4 cm radius. The attenuation of net current at larger radii was the result of a highly-conductive energetic component of plasma electrons surrounding the beam. Having benchmarked IPROP against experiment, the author has examined higher-current ion beams with respect to possible transport for inertial confinement fusion

[en] Source dimensions in the electron storage ring are routinely monitored on a diagnostic beam line. During recent recommissioning of the SRS, following the installation of a second wiggler magnet, relatively poor vacuum conditions were experienced. Large step changes in source size have been measured and broad tune signals have been seen, together with other effects characteristic of ion influences. Changes of source size and beam stability as a function of ion clearing electrode voltage have also been observed. This paper summarizes all such effects observed and comments on their probable causes. It also includes other data on source dimensions, such as measured emittance coupling and the effect of insertion devices in the lattice