Charged particle motion in second-order magnetic optical achromat is described using a canonical perturbation theory. Necessary and sufficient conditions for the existence of such a device are presented. Given these conditions, the second-order matrix elements at the end of the achromat are found explicity. It is shown that all geometric matrix elements are equal to zero and all chromatic matrix elements are either also equal to zero or proportional to the corresponding chromaticity. Thus all second-order matrix elements vanish simultaneously when the two chromaticities are made to be equal to zero 13 refs., 1 tab.

End Station A Test Beam (ESTB) is a beam line at SLAC using a small fraction of the bunches of the 13.6 GeV electron beam from the Linac Coherent Light Source (LCLS), restoring test beam capabilities in the large End Station A (ESA) experimental hall. ESTB will provide one of a kind test beam essential for developing accelerator instrumentation and accelerator R&D, performing particle and particle astrophysics detector research, linear collider machine and detector interface (MDI) R&D studies, development of radiation-hard detectors, and material damage studies with several distinctive features. In the past, 18 institutions participated in the ESA program at SLAC. In stage I, 4 new kicker magnets will be added to divert 5 Hz of the LCLS beam to the A-line. A new beam dump will be installed and a new Personnel Protection System (PPS) is being built in ESA. In stage II, a secondary hadron target will be installed, able to produce pions up to about 12 GeV/c at 1 particle/pulse.

A beam test of GLAST (Gamma-ray Large Area Space Telescope) components was performed at the Stanford Linear Accelerator Center in October, 1997. These beam test components were simple versions of the planned light hardware. Results on the performance of the tracker, calorimeter, and anticoincidence charged particle veto are presented.

Installation of the PEP-II electron and positron Injection beamlines in the SLAC linac housing is now underway. Utilization of the existing high power, low emittance beams available at SLAC required that a great portion of the systems for pulsed extraction and transport of 9.0 GeV electrons and 3.1 GeV positrons for injection into the PEP-II rings will reside in the existing linac housing. Approximately 4.7 kilometers of these beamlines will be completed during the summer of 1995. All components, including orbit correctors and diagnostic instruments, required for extraction and transport of the electron beam will be in place and ready for commissioning as soon as this fall. The positron transport line in the housing will also be complete except for the pulsed extraction system. These systems are described, along with the status of the construction and installation of the important subsystems such as magnets and power supplies, vacuum systems, instrumentation and controls. The plan for commissioning is discussed.

The SLC (SLAC Linear Collider) Ring-to-Linac (RTL) transport lines employ intense bending and strong transverse focusing to produce the momentum compaction needed for bunch length compression prior to S-band acceleration. In the presence of the large RF-induced energy spread needed for compression the consequent chromatic effects (i.e. the variation with energy of residual output dispersion and of the RTL transfer matrix) threaten to destroy the small emittances produced by the damping rings. The tuning methods that have been developed and used to implement the sextupole-based chromatic correction scheme are discussed.<>

The symmetries of the chromatic correction sections in the SLC (Stanford Linear Collider) Final Focus System allow a high-resolution determination of the pulse-to-pulse energy fluctuations by exploiting the information from beam position monitors (BPMs) in regions of large dispersion. By correlating this signal with other BPMs, it is possible to infer the dispersion function as well as spatial components of transfer matrices anywhere in the arcs and Final Focus System without interrupting normal machine operation. Results from data recorded during periods of stable operation and when the linac energy was intentionally varied are presented.<>

The length of the bunch for the TeV Linear Collider (TLC) must - -be decreased, while simultaneously preserving its small transverse emittance. To achieve a short bunch length (- 70 pm) needed for the TLC, it is neces- sary to use two-step compression of a 5 mm bunch which is extracted from the damping ring. The corresponding increase of momentum spread requires that chromatic aberrations of the transport line must be corrected at least up to second order. This goal is achieved by building the compressor out of second- order achromats, which also eliminates geometric aberrations. The utilization of flat beams restricts the design to an uncoupled, mid-plane symmetric trans- port line. The first compression is performed by a conventional compressor. For the second, it is possible to use a 180' bend. The emittance growth due to the synchrotron radiation is kept to several percent. .w

The betatron phase advance tunes are crucial parameters in the SLC (Stanford Linear Collider) arc optics because of the strong cross coupling between the x and y phase spaces, which takes place at rolled achromat boundaries. Phase measurements have been performed with an accuracy of about 0.3°/cell and, initially, substantial deviations from the design (108°) were observed. Corrections on an achromat-by-achromat basis have been performed to reduce the phase errors within less than 1°/cell. They were done by adjusting a current balance between focusing (F) and defocusing (D) magnets and by changing the horizontal relative displacements of F and D magnets using the XMOV magnet movers or with realignment work

The optical design of the beam transport lines between the SLAC (Stanford Linear Accelerator Center) linac and the electron damping ring and the design of part of the linac lattice itself will be modified to accommodate three superconducting solenoids for the purpose of manipulating the polarization of the electron beam. In order to allow arbitrary orientation of the polarization vector, this design will be capable of compensating the fields of two independent solenoids for arbitrary strengths ranging to 7.0 T-m. The method of dealing with the coupling of the betatron functions and the method of handling both the electron and the positron beams in the common region are discussed. If these beams have equal transverse emittance the transverse coupling will not affect the observed spot sizes