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Beam Delivery System / Machine Detector Interface


Title: BDS/MDI, Valencia Author: Deepa Angal-Kalinin Last modified by: Andrei Seryi Created Date: 11/21/2005 4:08:26 AM Document presentation format – PowerPoint PPT presentation

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Title: Beam Delivery System / Machine Detector Interface

Beam Delivery System / Machine Detector Interface
  • BDS Area leaders
  • Deepa Angal-Kalinin, Andrei Seryi, Hitoshi
  • ILC MAC meeting, January 10-12, 2007

BDS design optimization and evolutionVancouver
gt MAC(Sep06) gt Valencia gt MAC(Jan07)
  • Configuration changes (CCRs) after Vancouver
  • Baseline configuration to 14/14, single collider
  • 5m muon walls instead of 918m CCR approved
    23rd Sep
  • On surface detector assembly CCR approved 2nd
  • Evaluations by WWS, MDI panels CCB
  • MAC (Sep 06)
  • Further cost optimizations studies
  • Shorter BDS and shorter extraction lines
  • Several optics versions proposed, extraction
    lines shortened
  • Single IR evaluation of push-pull
  • Task force charged to report at Valencia
  • CCR submitted 19th Nov, on 23rd Dec CCB issued
    recommendation for the EC to approve the CCR. The
    EC approved it last Thursday

Vancouver baseline to Valencia baseline
Vancouver baseline
Diagnostics BSY tune-up dump
2mr IR
20mr IR
Two collider halls separated longitudinally by
Valencia baseline
14mr IR
14mr IR
One collider hall
Valencia 14/14 baseline. Conceptual CFS layout
muon wall tunnel widening
polarimeter laser borehole
9m shaft for BDS access
beam dump service hall
CFS designs for two IRs
Beam Delivery System tunnels
9m shaft for BDS access service hall
muon wall tunnel widening
beam dump service hall
beam dump and its shield
Muon walls
  • Purpose
  • Personnel Protection Limit dose rates in one IR
    when beam sent to other IR or to the tune-up beam
  • Physics Reduce the muon background in the

Scheme of a muon wall installed in a tunnel
widening which provides passage around the wall
Baseline configuration 18m and 9m walls in each
5m muon walls instead of 918m
  • Reduction of 18m muon spoilers to 5m and
    elimination of 9m muon spoilers CCR submitted
    8th September
  • Considered that
  • The estimation of 0.1 beam halo population is
    conservative and such high amount is not
    supported by any simulations
  • The minimum muon wall required for personnel
    protection is 5m
  • Detector can tolerate higher muon flux
  • Cost of long muon spoilers is substantial,
    dominated by material cost and thus approximately
    proportional to the muon wall length
  • The caverns will be built for full length walls,
    allowing upgrade if higher muons flux would be
  • MDI panel accepted this change
  • CCB approved this request on 23rd September
    contingent upon continuation of detailed detector
    studies to ensure that the occupancy due to muons
    does not affect the high precision physics

On-surface assembly CMS approach
  • CMS assembly approach
  • Assembled on the surface in parallel with
    underground work
  • Allows pre-commissioning before lowering
  • Lowering using dedicated heavy lifting equipment
  • Potential for big time saving
  • Reduces size of required underground hall

On-surface detector assembly CCR
  • According to tentative CFS schedule worked out
    by M. Gastal, CERN, the detector hall is ready
    for detector assembly after 4y11m after project
  • If so, cannot fit into the goal of 7years until
    first beam and 8years until physics run
  • Surface assembly allows to save 2-2.5 years and
    allows to fit into this goal
  • The collider hall size may be smaller (40-50)
    in this case
  • A building on surface is needed, but savings may
    be still substantial
  • Discussing possible variations
  • pure CMS assembly (config B)
  • modified CMS assembly (config A)
  • Assemble smaller (than CMS) pieces on surface,
    lower down and perform final assembly underground
  • May affect schedule (?), but preliminary looks by
    a small bit less expensive than B
  • The change request not intended to specify all
    the details for the schedule, hall sizes,
    capacity of cranes etc.
  • Such optimisation is being done in details by
    BDS, CFS and Detector concept groups.
  • CCB approved this CCR on 2nd November.

CERN LHC-ILC engineering forum Participation by
MDI members (Oct. 12,13)
  • Tour of ATLAS, CMS and ALICE
  • Presentations on
  • Radiation protection issues
  • CMS services
  • ATLAS installation
  • CMS installation infrastructure
  • ILC MDI present status and understanding H.
    Yamamoto and A. Seryi
  • Assembly and installation of an ILC detector N.
  • Extremely useful information from CERN colleagues
    based on real experience.

Optimizing the design and tweaking it to
understand its position the optimum
  • Since Vancouver, incorporated other cost saving
  • redesigned tail folding octupoles, final doublet,
    refined vacuum requirements, redesigned CFS
    tunnels, changed design of water and air cooling
    systems, decimated bends, removed any spares and
    overheads, scrutinized all tech area for cost
    savings, etc.
  • Other design optimization studies that were
    performed, but were not included, as not giving
    performance improvement and/or cost savings
  • studied shorter BDS or its subsystems
  • studied lowering power of tune-up dumps
  • studied replacing magnetized muon walls with
    magnetized muon doughnuts

Single IR questions
  • GDE suggested evaluation of push-pull at the end
    of September.
  • Questions to be evaluated
  • Organizational and historical questions
  • Accelerator design questions
  • Detector design questions
  • Engineering integration questions
  • Detailed list of questions to be studied
  • Technical evaluation of push-pull option by an
    extended task force, which include more than 60
    detector and accelerator experts from ILC
    community and beyond. Detailed summary presented
    at Valencia.
  • Conclusions from task force should be feasible,
    provided careful design and sufficient RD
  • Conclusions from detector concept groups do not
    see show stoppers, detailed engineering design
    studies are needed to give confidence, in
    meantime would like to see two IR option kept as
    an alternative
  • WWS comments H. Yamamoto (next talk)

Single IR BDS (version 2006e)
  • Upgrade to 1 TeV CM involves adding magnets only
    no geometry changes
  • Total BDS Z-length is 4452 m (2 IRs5100m)
  • Removed dedicated energy error dianostics (MPS)
    and replaced with polarimeter chicane (some

hybrid BSY (x 2)
14 mrad ILC FF9 hybrid (x 2)
IR 14 mrad
?Z -650 m w.r.t. ILC2006c
2226 m
14 mrad (L 5.5 m) dump lines
M. Woodley et al
BDS with single IR
Sacrificial collimators
14mr IR
Tune-up dump
betatron collimation
skew correction / emittance diagnostic
MPS coll
fast kickers
fast sweepers
tuneup dump
beta match
final transformer
energy collimation
primary dump
energy spectrometer
fast sweepers
final doublet
energy spectrometer
500GeV gt 1TeV CM upgrade in BSY of 2006e
Magnets and kickers are added in energy upgrade
M. Woodley et al
Single IR BDS optics (2006e)
Concept of single IR Final Doublet
vacuum connection feedback kicker
common stationary cryostat
Original FD and redesigned for push-pull (BNL)
Redesigned FD
IR magnets
BNL prototype of sextupole-octupole magnet
BNL prototype of self shielded quad
cancellation of the external field with a shield
coil has been successfully demonstrated at BNL
New optics for extraction FD push pull
  • Rearranged extraction quads are shown. Optics
    performance is very similar.
  • Both the incoming FD and extraction quads are
    optimized for 500GeV CM.
  • In 1TeV upgrade would replace (as was always
    planned) the entire FD with in- and outgoing
    magnets. In this upgrade, the location of
    break-point may slightly move out. (The
    considered hall width is sufficient to
    accommodate this).

Nominal scheme
Push-pull scheme
B.Parker, Y.Nosochkov et al.
Extraction Lines shortened by 100m
For undisrupted beam reliance on beam sweeping on
beam dump window using kickers.
high L parameters (500 GeV CM)
Total loss before and at collimators for High L
parameters is within acceptable levels. Losses
for the nominal case are negligible.
Concept of single IR with two detectors
The concept is evolving and details being worked
may be accessible during run
detector A
accessible during run
Platform for electronic and services (1088m).
Shielded (0.5m of concrete) from five sides.
Moves with detector. Also provide vibration
Detector systems connections
Push-pull cryo configuration
Optimized for fast switch of detectors in
push-pull and fast opening on beamline
QD0 part
QF1 part
This scheme require lengthening L to 4.5m and
increase of the inner FD drift Opening of
detectors on the beamline (for quick fixes) may
need to be limited to a smaller opening than what
could be done in off-beamline position
central part
Shielding the IR hall
Self-shielding of GLD
Shielding the 4th with walls
Working progress on IR design
Mobile Shield Wall
Illustration of ongoing work Designs are
tentative evolving
Structural Rib
3m Thickness
Overlapping Rib
Mobile Platform 20m x 30m
Electronics/Cryo Shack 1m Shielded
9m Base
25m Height
John Amann
CFS layout for single IR central DR
CFS layout for single IR
Single IR push pull schedule
  • The hardware can be designed to be compatible
    with a one day move, and this can be a design
  • Need to study cost and reliability versus the
    move duration
  • Need to study regulations in each regions
  • A.Yamamoto presented a scheme (which includes
    warming-up the cold-box and disconnecting room T
    lines) and give an estimation of one week (many
    other tasks can be done in parallel with cryo
    work), which can serve as conservative boundary
    of the range
  • Recalibration (at Z) may or may not be needed,
    and may be independent on push-pull to be
  • BDS group will study the range between one day
    and one week and optimize the design versus cost,
    performance, reliability, etc.

Single IR, push-pull cost
  • Cost difference of two IR versus single IR
    push-pull as reported to CCB on Dec.15 (based on
    Valencia wbs)
  • baseline 14/14 100
  • estimate for single p-p IR 69.1, with further
    updates 67.6
  • Estimation of saving, in Value cost, is 31-32 of
    BDS cost
  • Using single push-pull IR saves about one third
    of two IR BDS cost, or in other words the two IR
    BDS is by about 50 more expensive than single
    push-pull IR BDS
  • Estimation of additional hardware that is needed
    to make push-pull feasible is small fraction of
    the savings

From summary of CCB response on Single IR
  • CCB agrees that .. CCR qualifies as Class-2.
    Consequently, CCB assumes that its role is to
    make recommendation to EC rather than to make a
  • CCB recommends EC to accept CCR23, whereby
    incorporating the "1IR with two detectors
    push-pull" as Baseline Configuration.
  • CCB recommends EC to maintain the previous
    Baseline with "2IR, single hall, two detectors"
    as part of Alternative Configuration.
  • CCB recommends EC to reinforce a taskforce on
    Machine-Detector-Interface issues. The taskforce
    should be specifically charged to facilitate
    pertinent design development efforts and
    discussions on relevant executive matters.

Briefly on other systems
  • Magnets and PS
  • Vacuum system
  • Crab cavities
  • Beam dumps collimators
  • IR hall, surface buildings cranes

Magnets and PS
  • Most of the magnets are rather standard, but
    require good magnetic and mechanical stability
  • All PS are high availability design, stability in
    several ppm range (building 40 PS for ATF2 now)
  • PS are placed in the service tunnel, cable
    penetrations are every 100m, which reduces heat
    load in the tunnel helping thermal and mechanical
  • All BDS magnets in incoming beamlines except
    bends are on movers with 50nm step
  • Special magnets except FD and first extraction
  • SC tail folding octupoles (BNL design)
  • beam sweepers
  • Kickers with option of DC bends
  • Antisolenoids embedded in the detector
  • Detector integrated dipoles (part of detector
  • Magnetized muon walls

Vacuum system
  • Material choice
  • is defined by the resistive wall effects for
    off-centered bunch preserving the beam emittance
    discourage use of SS chambers
  • Considered Al version and Cu plated SS chambers.
    Chosen the latter as more reliable, keeping Al
    for backup option. Chambers in the places where
    SR is expected (e.g. chicanes) are Cu
  • Vacuum pressure
  • determined by the need to minimize background due
    to beam-gas.
  • Need 1nTorr in 200m upstream of IP (may need in
    situ baking), 10nTorr in 200-800m and 50nTorr
    in the rest of the system

Crab cavities
  • BDS has two SC 9-cell cavities located 13 m
    upstream of the IP operated at 5MV/m peak
  • Based on a Fermilab design for a 3.9GHz TM110
    mode 13-cell cavity.
  • The uncorrelated phase jitter between the
    positron and electron crab cavities must be
    controlled to 61 fsec to maintain optimized
  • A proof-of-principle test of a 7 cell 1.5GHz
    cavity at the JLab ERL facility has achieved a 37
    fsec level of control.
  • Other key issues to be addressed are LLRF
    control and higher-order mode damping.
  • Top earlier prototype of 3.9GHz deflecting
    (crab) cavity designed and build by Fermilab.
    This cavity did not have all the needed high and
    low order mode couplers.
  • Bottom Cavity modeled in Omega3P, to optimize
    design of the LOM, HOM and input couplers.FNAL
    T. Khabibouline et al., SLAC K.Ko et al.
  • Design is being continued by UK-US team

3.9GHz cavity achieved 7.5 MV/m
18MW Water Dump design features
  • BDS features
  • Optics drift to increase undisrupted beam spot
    size on window
  • Raster beam in 30mm radius circle in 1 ms
    interlock to MPS
  • Hi-power donut collimators to protect vessel
  • Vessel
  • 6.5m (18X0) water followed by 1m water-cooled Cu
  • 1.5m diameter with vortex flow water, v1.0-1.5
    m/s , at r30cm
  • 10 atm to prevent boiling
  • 30 cm diameter 1mm Ti vessel window with water
    cooling nozzles
  • Rad water system
  • 2300 gpm three loop water system
  • 18 MW heat exchanger 400HP of pumps per loop
  • Catalytic H2-O2 recombiner
  • Mixed bed ion exchange column to filter 7Be
  • Containment for tritiated water
  • Shielding
  • 50cm Fe 150cm concrete local protection for
    personnel beamlines
  • 200cm site dependent to protect ground water

18MW Dump design
  • Two companies Fichtner Framatome, design and
    cost estimate for TESLA TDR
  • Fichtner design for TESLA reworked by RAL
  • Taken into account recent RAL experience with
  • RAL design included additions for window remote
    handling, air exchange and control, air drying
    and recovery, etc.

IR surface area
Included in IR hall and surface buildings
  • IR halls
  • finished civil engineering works, plus
  • movable concrete intermediate shielding wall in
    two parts (on air pads)
  • steel platforms with staircases and all fittings
  • two 1.6t elevators between steel platforms plus
    two 2.8t in shafts,
  • steel plates on the floor of the Hall
  • one 400t and two 20t overhead cranes in Hall
  • etc
  • Included in surface assembly building
  • 400t and 20t overhead cranes
  • Requirements for detector assembly are different
    (table on the next slide). Since we cannot tell
    now which detectors will be used, assumed
    Configuration A
  • This choice can suite some detectors better than
    other (one size does not fit all) and is the
    reason for concerns
  • Further adjustments of IR hall and surface
    building are needed, and detector colleagues
    should be more deeply involved in this design and
    also cost optimization

Table of IR assumptions
  • Several configuration changes since Vancouver to
    Valencia and final RDR version.
  • Single IR with two complementary detectors in
    push-pull configuration has been recommended by
    CCB to EC as a baseline for the RDR. The EC
    approved it last Thursday
  • This configuration gives 30 saving compared to
    two IR 14/14 mrad configuration.
  • Single IR BDS optics design allows upgrade to 1
    TeV in the same tunnel.
  • The on surface detector assembly will save 2-2.5
    years and has been accepted by the MDI panel.
  • The engineering details will be carried out in
    the EDR phase.

Backup slides
500 GeV cm
1 TeV cm
Power cooling in BDS
Table as of Valencia, 1TeV CM, two IR.
Table is as of 11/26/2006
9.768 0.862 218 MW gt Power from Magnets, PS
Dumps to LCW 0.726 MW gt Cables to Airgt
approximately 60W/m in average 0.712 MW gt PS to
Air gt taken out by Chilled water
Cost breakdown for single IR
(Labor person-hours, such as installation, was
converted to dollars to produce this chart)
Beam Dump Vessel
Beam Dump Service Cavern Layout
If detector does not provide any radiation
18MW loss on Cu target 9r.l \at s-8m. No
Pacman, no detector. Concrete wall at 10m. Dose
rate in mrem/hr.
  • For 36MW maximum credible incident, the concrete
    wall at 10m from beamline should be 3.1m

25 rem/hr
Alberto Fasso et al
IR hall radiation safety criteria
  • BDS produces and uses ILC radiation guidance
  • beam containment policies and devices, conditions
    for occupancy
  • For IR region, in particular, defines
  • Normal operation dose less than 0.05 mrem/hr
    (integrated less than 0.1 rem in a year with 2000
  • allows non-rad workers in IR hall
  • Accidents dose less than 25rem/hr and
    integrated less than 0.1 rem for 36MW of maximum
    credible incident (MCI)

Detector sizes opening on beamline
SiD (opened)
Since opening of detectors on the beamline is
intended only for quick fixes, the required width
for opening may be smaller that for opening
FD with L4.5m lengthened warm drift section
by 0.7m
Detector opened on beamline (GLD opening reduced
to 1.5m) still leaves 0.5m of not-overlapped
space for config.C
  • Laser wire
  • Deflecting cavity Y-T
  • Loss monitors ion chamber PMT
  • Cav BPM C-band, S-band, L-band
  • Stripline or button bpm
  • X sync light tr. profile imager
  • Current monitors
  • Pickup phase monitors
  • Feedbacks
  • Polarimeter laser upstream downstream
  • E-spectrometer

IR coupling compensation
When detector solenoid overlaps QD0, coupling
between y x and y E causes large (30 190
times) increase of IP size (greendetector
solenoid OFF, redON)
without compensation sy/ sy(0)32
Even though traditional use of skew quads could
reduce the effect, the local compensation of the
fringe field (with a little skew tuning) is the
most efficient way to ensure correction over wide
range of beam energies
with compensation by antisolenoidsy/ sy(0)lt1.01