Low Energy Separated Beam III- C4

Brookhaven National Laboratory
(Revised 9-12-02, Contact: Phil Pile, 631-344-4643, pile@bnl.gov) 

LESBIII Drawing

• Postscript File
• PDF File
• Gif image

Parameters

• Maximum Momentum: 830 MeV/c
• Length: 19.6 meters
• Angular acceptance: 12 msr
• Momentum acceptance: 4% fwhm
• Beam Optics: Corrected to third order
• Movable Collimators:
• 4Jaw Theta-Phi Collimator
• Horizontal Momentum Collimator
• Two Vertical Collimators (Mass Slits)
• Second horizontal collimator at achromatic focus
• Electrostatic Separators:
• Two Stage Separation
• < 625kV, 12.7 cm gap x 2.0 meter - #1
• < 560kV, 10.2 cm gap x 2.0 meter - #2
• Target: - 2001-2002
• 6 cm long platinum
• water cooled copper base
• Maximum ~30 x 10¹² per second
• Picture
• Targets: - Retired
• FY95-96 target - picture
• June 96-1999 - picture#1, picture#2, picture#3
• Production Angle: 0 degrees
• Particle Flux (per 10¹³, 24 GeV/c protons on target):
• 800 MeV/c positive kaons - 4.8 x 10⁶ with 71% purity
• Stopped positive kaons  ~10⁶

Present Use

• E787/E949, Rare Kaon Decay ; K⁺ --> p⁺ nbar

Support

• Liaison Physicist: I-Hung Chiang 631-344-7903
• Liaison Engineer: Dave Phillips 631-344-4671 (pager 4267)