Micro Status Report of SLAC Phase II Plan Tom Markiewicz SLAC

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Micro Status Report of SLAC Phase II PlanTom
MarkiewiczSLAC
US LHC Accelerator Research Program
bnl - fnal- lbnl - slac

• 03 February 2005

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1st Order Goal

• Giving up DAMAGE-free criteria is it remotely
  possible to build a ROTATING METAL COLLIMATOR-
  that we can Cool- that has reasonable
  collimation system efficiency- that satisfies
  mechanical space accuracy requirements
• FLUKA/ANSYS results of 90kW/450kW loss scenarios
  shown at 10/21 LARP meeting at NAPA and at
  November CERN-LARP Video meeting implied answer
  is YES!!
• Thin Cu (5mm) over Be
• Be
• Aluminum
• all seem approximately feasible from Heat Load
  point of view
• So general feeling is to PROCEED

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Energy Deposition in Metal Phase II Secondary
Collimators w/ Carbon Phase I Collimators Open
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Power absorbed in one TCSH1 jaw at 10s when 80
(5) of 450kW of primary beam interacts in TCPV
(TCSH1)
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Steady State Temperature of TCSH1 at shower max
when jaw at 10s is in contact with 20C H2O and
80 (5) of 90kW of primary beam interacts in
TCPV (TCSH1)
25mm
Jaw 25x80mm Solid Cu PTOT1270W
CV Cu taken as constant
80mm
Doyle 2004-09-28
Power Density to H2O 0.38 MW/m2(H2O boils at 1
atm _at_ 1.3E6)
Boundary Condition Convection
CoefficientHCH2011880 W/m2/C
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Steady State Cooling Estimate for 90kW loss rate
OK
OK
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Next Steps

• 1) Work out conceptual engineering of a 1m metal
  cylindrical collimator with 10kW cooling that
  meets stability/accuracy requirements
• 2) Define exact parameters of a (potentially
  expensive) prototype
• Is there not a better way of achieving the
  desired system efficiency by changing the
  lengths, materials gaps of the current system
  that leaves us with an easier collimator to
  build?
• Yunhai
• Exact roles of scattering, inelastic
  interactions, primary, secondary, tertiary
  absorber devices
• What will the heat loads be on each jaw of this
  system?
• Lew
• Incorporate loss maps
• Understand heat load on each collimator, not just
  those after primary

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Problems

• We do not seem to understand the basic behavior
  of the collimation system
• Why does efficiency change in manner it does as
  parameters are changed?
• 2) Technical difficulties in running more
  complicated FLUKA to get richer information about
  more devices

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Next Goal

• By Spring
• Commit SLAC to delivering prototype
• Acquire lab space infrastructure (vacuum,
  measurements, heating, cooling)
• Begin post-doc search
• Have better concept of engineering team