LIONs at the Stanford Linear Accelerator Center

Conference · Thu Jan 01 04:00:00 EST 1998

OSTI ID:663322

Constant, T N; Zdarko, R W; Simmons, R H; Bennett, B M

The term LION is an acronym for Long Ionization Chamber. This is a distributed ion chamber which is used to monitor secondary ionization along the shield walls of a beam line resulting from incorrectly steered charged particle beams in lieu of the use of many discrete ion chambers. A cone of ionizing radiation emanating from a point source as a result of incorrect steering intercepts a portion of 1-5/8 inch Heliax cable (about 100 meters in length) filled with Argon gas at 20 psi and induces a pulsed current which is proportional to the ionizing charge. This signal is transmitted via the cable to an integrator circuit whose output is directed to an electronic comparators, which in turn is used to turn off the accelerated primary beam when preset limits are exceeded. This device is used in the Stanford Linear Accelerator Center (SLAC) Beam Containment System (BCS) to prevent potentially hazardous ionizing radiation resulting from incorrectly steered beams in areas that might be occupied by people. This paper describes the design parameters and experience in use in the Final Focus Test Beam (FFTB) area of the Stanford Linear Accelerator Center.

• Research Organization: Stanford Univ., Stanford Linear Accelerator Center, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 663322
• Report Number(s): SLAC-PUB--7691; CONF-971171--; ON: DE98059161
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ARGON
CHARGED PARTICLES
CONTAINMENT SYSTEMS
CONTROL SYSTEMS
IONIZATION CHAMBERS
IONIZING RADIATIONS
MONITORS
POINT SOURCES
SHIELDS
STANFORD LINEAR ACCELERATOR CENTER