LOG Review of MECO Cost Status MECO Extinction WBS 1'3'1

1
LOG Review of MECO Cost StatusMECO Extinction
WBS 1.3.1
W. Molzon Subsystem Manager University of
California, Irvine January 19, 2005
2
Extinction Overview

• AGS Project provides internal extinction
  device(s) to make a beam pulsed at 731 kHz with
  15 ns wide pulses
• It is unlikely to provide extracted beam with
  extinction of 10-9 (required ratio of protons
  between pulses to protons in pulses)
• Level of extinction exiting the AGS will not be
  known until 2008
• This WBS element provides additional resources
  for extinction
• A means to measure the AGS circulating beam time
  structure
• A time-modulated magnet in the proton beamline to
  improve extinction
• Detectors to measure the extinction both before
  the time-modulated magnet and at the muon
  production target
• Conceptual idea for a secondary extinction device
• Time-modulated magnetic deflection synchronized
  with filled buckets to deflect protons between
  buckets out of beamline
• Field integral required depends on beam optics
  500Gm
• Ideal time structure is rectangular wave magnet
  pulsed at 731 kHz with rise and fall time lt 50 ns
• Implementation planned is a set of RF modulated
  magnets at one or more harmonics of the pulsing
  frequency power efficient and configurable for
  different time dependence of kick

Magnet cross-section
3
Monitoring Extinction

• Various very preliminary ideas for measuring
  extinction in the AGS really a research project
  and costs are my own guesses unlikely to be
  right
• Idea for continuous monitoring of AGS and final
  extinction exploit successfully used technique
  of measuring secondaries from a target
• Detect a signal of a proton hitting a thin
  window/target in proton beamline and for a proton
  hitting the muon production target time
  structure of latter is exactly what we need
• Measure 10-9 extinction in few minutes and
  measure the phase of the out-of-time protons
• Eliminate background from in-phase protons and
  other background sources (e.g. cosmic rays)

4
Interfaces

• Close interface with proton beamline optics
  must be developed with regard to secondary
  extinction device
• Interface with production solenoid uses
  fringe-field as part of secondary momentum
  selection
• Interface with AGS extra extinction required
  depends on AGS performance, internal AGS
  extinction measurement requires invasive or
  non-invasive measurements in or very close to the
  AGS beampipe
• Interfaces with DAQ to get signals into
  data-stream
• Interface with muon beamline time dependence of
  extinction requirement depends on transport
  properties in muon beamline
• Interface with simulation and analysis to specify
  requirements, simulation of performance