Accelerator advances and experimental plans in the Stanford Linear Collider

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243650

Seeman, J

Many accelerator physics advances at the Stanford Linear Collider (SLC) have been achieved improving the production, transport, and stability of the exceptionally high quality beams needed for high luminosity collisions with polarization for high energy particle physics and for tests of concepts for a future linear collider. At present, two single bunches are collided at the SLC in which they are damped to a small phase space volume, accelerated to 47 GeV, and focused to small spots (1.7 to 2.2 microns radius), all with high charges and good efficiency at 120 Hz. The accelerator advances have allowed the production of significant integrated luminosity in 1992 and exciting experimental plans for the coming years. Several of the successes are (1) polarized electrons at the IP (over 22%) using bulk GaAs photoemitters, (2) additional stability produced by improved transverse wakefield damping, (3) globally used pulse-by-pulse fast feedback (over 120 parameters controlled), (4) second-order chromatic correction in the final focus, (5) induced oscillations to cancel errors and make small emittances, and (6) flat beam tests (Ey = Ex/5), to name a few. There are also near term improvements planned with the aim of higher SLC luminosity which have strong implications for future accelerators: (a) thin-substrate or strained-lattice GaAs photoemitters for higher electron polarization (40-75%), (b) second- and third-order optics corrections with an upgraded final focus, (c) new damping ring vacuum chambers with low impedance for improved beam stability and emittance at high currents, and (d) operation of the SLC with flat beams. Several longer range improvements under investigation are upgrades to the damping rings for lower final emittances and changes needed for multibunch operation of the SLC. In light of the present results and the expectations of the near-term advances, the high energy experimental program vigorously continues.

• DOE Contract Number: AC03-76SF00515
• OSTI ID: 243650
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM BUNCHING
BEAM SHAPING
CHROMATIC ABERRATIONS
ELECTRON BEAMS
EXPERIMENT PLANNING
POLARIZATION
STABILITY
STANFORD LINEAR COLLIDER