Beam Delivery configuration materials to start discussion

1
Beam Delivery configurationmaterials to start
discussion

• Andrei Seryi, Deepa Angal-Kalinin, Hitoshi
  Yamamoto
• BDS area
• GDE meeting at KEK, January 19-20, 2006

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Progress

• RDR work
• Contacting Technical systems (Magnets, Vacuum,
  Instrumentation, etc) to establish communication
  and define scope the work
• Start to estimate and request needed resources
• Design work
• Continue design optimization, e.g.
• Finalize optics for tune-up extraction and
  diagnostics
• Consider improvements in 2mrad extraction
  chicanes (0.7MW SR loss at 1TeV CM)
• Will consider low power tune-up dumps
• Technical consideration of push-pull requirements
• Radiation physics study for single IR hall self
  shielded detector MPS
• design for 1TeV compatibility
• Any design changes will go through CCB

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ILC BDS baseline
Layout and counts are accurate to better than 10
anticipate very small change of optics in
diagnostics and fast extraction. If will go
e.g. to single dump and add a beamline to the
main dump could have some effects on the count
as well

• Magnets
• Vacuum
• Collimation and beam dumps
• Instrumentations
• Civil
• RF, cavity package, cryomodule

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Lengths, counts of magnets (for present optics)

• Total length of beamlines
• 12008 m
• Counts of magnets (N Ltotal Laverage)
• Bends 484 3375m 6.97m
• Quads 536 996m 1.86m
• Sextup 40 39.6m 0.99m
• Octup 46 60.8m 1.32m
• Kickers 250 200m 2m
• Total length of magnets (active length)
• 4673 m
• Active / Total length
• 38.9
• This number (active/total) is underestimation,
  e.g. length of BPMs is not included (if stick out
  of magnets) or other instrumentation

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Vacuum system

• Total length of vacuum system 12km
• about 7500m of drifts with simple vacuum chamber
• about 3400m are in bends with moderate SR. Design
  of chamber need to be evaluated
• Several chicanes in extraction with high SR
  losses. Special chamber design will be needed.
• About a thousand of quads and bends and about a
  thousand of BPMs, with associated vacuum
  connections
• There is instrumentation which require optical
  windows
• The aperture ranges from couple of cm to half a
  meter in some places in extraction line
• Vacuum requirements, about 10nTorr near IR (tbc)
• The need for fast valves in several places (e.g.
  near dumps)
• Perhaps one of the biggest single cost items in
  BDS
• Other (minor) questions
• narrow gaps from collimators take into account in
  conductance eval.
• Specific requirements for vacuum readout for MPS
  and BDS diagnostics ?
• Accel. phys. tech. group to contacts e.g. for
  vacuum req. reeval.

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Magnets (warm, SC, Pulsed, Special)

• Long weak warm dipoles
• Warm quads
• Magnet movers
• Warm large aperture extraction quads
• Kickers for fast extraction
• Compact direct wind SC IR quads
• Compact direct wind sextupole/octupole IR
  packages
• Large aperture SC IR quads
• Large aperture SC IR sextupoles
• Octupoles for tail folding SC direct wind
• Septa for fast extraction
• Warm pocket coil IR quad
• Warm or SC super septum extraction quads
• Magnetized muon spoilers (9 and 18m iron walls)
• Detector integrated dipoles in detectors
• IR antisolenoids
• Related power supply stability. Location of PS.
  Alcoves or surface bldg.?

Warm quads cost driver Large count
IR quads Cost driver Unique and difficult
Muon walls Cost driver large cost of material
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Muon spoilers

• Two magnetized walls 9m and 18m in each branch
• Needed to reduce muon flux at IP to below
  10muons per 200 bunches
• Assume 0.001 of beam lost at collimators
• Muon spoilers seem to beone of costly items and
  needto revisit strategy of theirimplementation
• Staging? Start with min set and add if muons is
  too high?
• Alternatives

Older NLC picture
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Muon spoiler material cost estimation

• 4m5m (9m18m) 4branches density 8Ton/m3
  3.3/kg 57M for the material only
• References for iron cost (range from 2.2kg to
  3.5/kg)
• 1) M.Breidenbach et al 3.48/kg SiD muon
  system (Babar Kawasaki experience. M.B. Note
  iron is a commodity with big fluctuations)
• 2) L.Keller raw material0.7/kg,
  fabrication1.5/kg, total2.2/kg
• probably obsolete data
• 3) F.Asiri material 1000/ton in US. Cost of
  prepared, cut, crated and delivered to order is
  about 3,300/ton. Korean Iron may be purchased
  for about 30 less in US.

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Civil layout ?s
e tunnel ?

• Location of shafts (8?)
• at each dump (6) and IP (2) ?
• Location of positron go-around tunnel
• Do we need service tunnels?
• Alcoves for electronics?
• Location of power supplies?

Shaft also here?
Service tunnels?
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Beam dump enclosures service tunnels?

• Shafts?

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Drawings and other misc. questions

• Drawings like those CF layouts shown in previous
  page should they be provided to all GDE on
  password protected web site?
• Are there global guidance on what cranes or other
  transportation machines will be available in the
  halls, alcoves and in the tunnel?
• e.g. if we need to move 12m long magnet, or
  remove collimator, what is the procedure? Is
  there global guidance on limits for sizes of
  components?

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Beam dumps and collimations

• Full power dumps (18MW) (6)
• Removing tune-up dumps will be considered
• Photon (1-3?MW) dumps (2)
• Fixed aperture protection collimators (60)
• Adjustable spoilers and absorbers (60)
• Passive devices to limit betatron aperture (to be
  designed)
• Forming the task force to estimate beam dump
  cost and understand importance of site and ground
  water
• Beam Dumps and Collimation technical system 1
  name out of 3. Very big issue. Can we solve it in
  48hours?

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RF, cryomodule, cavity package systems

• Crab cavity systems
• Based on 3.9GHz deflecting mode cavity developed
  at Fermilab
• Present 3.9GHz CKM cavity not suitable as
  prototype it is mechanically too soft, its
  frequency is 3.925GHz, etc.
• Experience with 3.9GHz accelerating mode cavity
  is also relevant
• Fermilab is best positioned to make RDR design
  and cost estimation, as well as start work on
  real crab cavity design and prototype, to be
  built in 1.5 years
• Coordination with UK colleagues and work sharing
  need to be discussed. E.g. cavity itself
  Fermilab, phase stabilization system UK ?

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Instrumentation

• BPM and their channels 1100
• Large aperture (r3cm) design issues
• Laser wire systems
• Current monitors, loss monitors (standard)
• Feedbacks and fast luminosity monitors, pair
  monitor
• Spectrometer and polarimeter upstream
  downstream
• Alignment Civil group Instrumentation
• This week at SLAC mtg of Instrumentation
  technical group for discussion of feedbacks in
  BDS etc

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IR systems and magnets

• Unique, difficult magnets, integration with
  detectors, RD
• One of the high cost items ( X0M ?)
• Do not have sufficiently detailed sketches that
  would allow to make technical and engineering
  evaluation
• One of concerns and the area where trying to pull
  in resources
• 20(14)mrad IR magnets design and cost
  estimation by BNL
• 2mrad IR magnets design and cost estimation by
  Fermilab and Saclay
• IR instrumentation, LUMI/BEAMCALs, IP BPMs,
  kickers

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20/14mr

• BNL
• Issue of resources at BNL

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Conceptual design of 2mrad IR
Shared Large Aperture Magnets
Disrupted beam Sync radiations
Q,S,QEXF1
SF1
QF1
SD0
QD0
60 m
Beamstrahlung
Incoming beam
pocket coil quad
Rutherford cable SC quad and sextupole
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Details of zero degree design
Design of 20 2 mrad IR need to advance to and
beyond this level of details
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IR hall sizes

• Large range (3.5 times in volume)
• Parametric studies of cost (excavated volume)

SiD 48m x 18m x 30m SiD Collab. Mtg. 16-17
December 2005
GLD 72m x 32m x 40m Snowmass data
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Cost of BDS

• Two approaches should give about the same answer
• Bottom -gt top approach (count parts, individual
  cost)
• Top -gt bottom (compare with recently built
  accelerators, scale, and adjust for differences)
• With exception of special systems, whose cost
  could be added, BDS is a lot of kms of warm
  magnets and vacuum chambers
• It should be possible to compare it, for example,
  with Main Injector cost, scale according to
  beamline length, length of magnets and add
  special costly systems (beamdumps, muon walls, IR
  halls, IR and FD)
• There are many caveats (e.g. more precise power
  supplies could be more expensive) but top-bottom
  cost should also give correct answer

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Possible cost saving strategies

• Singe IR (will be chosen when more design and
  cost information will be available, in 5month)
• Install only fraction (half) of bends at 500GeV
  CM stage
• this will increase difficulty and cost of the
  energy upgrade
• Design all quads as consisting from two halves
  and install only one half at 500 GeV CM
• same difficulty with upgrade
• Replace high power tune-up dumps with low power
• additional beamline from BDS entrance to main
  dump gt cost
• Consider staging construction and installation of
  muon walls (e.g. start with min 5m wall). Install
  more if muon rate is too high
• May be difficult to install the wall in
  operational tunnel
• Consider alternative muon spoilers
• Undisrupted beam size at dump window - rely not
  on drift but more on rastering - shorten
  extraction lines (MPS)

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Some milestones

• Feb 13-14, GDE mtg at Fermilab review BDS
  optics
• Bangalore
• one more iteration on IR comparison
• first report on technical evaluation of
  push-pull?
• evaluation (e.g. rad. physics) of single IR hall
• more details on upgrade paths from single IR
• including consideration of upgrade to gamma-gamma
• Will set up review of beam dump cost and design
  end of March?
• End of May full picture of IR performance and
  cost
• possibly, that is when will choose the favorite
  IR design