Interaction region issues at the NLC

Conference · Sun Aug 01 04:00:00 EDT 1993

OSTI ID:10187682

Markiewicz, T W

The SLAC-based NLC working group has been considering issues relevant to the operation of an X-band 0.5--1.0 TeV collider. This report summarizes some of the results the group has achieved to date. The NLC will collide trains of closely spaced bunches of 10{sup 10} particles. Typical parameters are 1.4 ns for the inter-bunch spacing, 100 bunches/train, and 180 trains/sec. Its final focus (FF) will provide spot sizes at the interaction point (IP) of dimensions {sigma}{sub x} = 300--400 nm, {sigma}{sub y} = 2--3 nm, and {sigma}{sub z} = 100 {mu}m. The closely spaced bunches and the desire to have each bunch interact only with its partner imply that there must be a crossing angle to the IP. The high charge density will cause backgrounds due to electromagnetic beam-beam interactions and particle detectors with good timing resolution will be required to separate hits from the interaction causing the trigger from the background hits arising from other bunches in the train. The 2 nm beam spots will challenge experimenters to get and keep the beams in collision. They will require special consideration to be given to issues of alignment, ground motion, and vibrations induced by the transfer of cooling fluids. The detector masking must be able to reduce to manageable levels the backgrounds due to synchrotron radiation in the final quadrupoles and to the beam-beam interaction. Simulations of these backgrounds should consider the worst case of 2 beam trains of 10{sup 12} particles each at 500 GeV.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 10187682
• Report Number(s): SLAC-PUB--6315; CONF-930449--6; ON: DE93041084
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430100
BACKGROUND RADIATION
BEAM-BEAM INTERACTIONS
COLLIDING BEAMS
DESIGN, DEVELOPMENT, AND OPERATION
FEEDBACK
GROUND MOTION
LINEAR COLLIDERS
MAGNETIC FIELDS
MECHANICAL VIBRATIONS
MUONS
SYNCHROTRON RADIATION