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Beam Delivery System / Machine Detector Interface. BDS Area leaders Deepa Angal-Kalinin, Andrei Seryi, Hitoshi Yamamoto ILC MAC meeting, January 10-12, 2007. BDS design optimization and evolution Vancouver => MAC(Sep06) => Valencia => MAC(Jan07) . Configuration changes (CCRs) after Vancouver

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Beam Delivery System / Machine Detector Interface

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Beam delivery system machine detector interface l.jpg

Beam Delivery System / Machine Detector Interface

BDS Area leaders

Deepa Angal-Kalinin, Andrei Seryi, Hitoshi Yamamoto

ILC MAC meeting, January 10-12, 2007

Global Design Effort


Bds design optimization and evolution vancouver mac sep06 valencia mac jan07 l.jpg

BDS design optimization and evolutionVancouver => MAC(Sep06) => Valencia => MAC(Jan07)

  • Configuration changes (CCRs) after Vancouver

    • Baseline configuration to 14/14, single collider hall

    • 5m muon walls instead of 9+18m – CCR approved 23rd Sep

    • On surface detector assembly – CCR approved 2nd Nov

  • 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

Global Design Effort


Vancouver baseline to valencia baseline l.jpg

Vancouver baseline to Valencia baseline

Vancouver baseline

Diagnostics

BSY

tune-up dump

2mr IR

b-collim.

E-collim.

20mr IR

Two collider halls separated longitudinally by 138m

FF

Valencia baseline

14mr IR

14mr IR

One collider hall

Global Design Effort


Valencia 14 14 baseline conceptual cfs layout l.jpg

Valencia 14/14 baseline. Conceptual CFS layout

muon wall tunnel widening

polarimeter laser borehole

9m shaft for BDS access

IP2

10m

IP1

beam dump service hall

alcoves

1km

Global Design Effort


Slide5 l.jpg

CFS designs for two IRs

Vancouver

Valencia

Global Design Effort


Beam delivery system tunnels l.jpg

Beam Delivery System tunnels

9m shaft for BDS access & service hall

muon wall tunnel widening

alcoves

beam dump service hall

beam dump and its shield

Global Design Effort


Muon walls l.jpg

Muon walls

  • Purpose:

    • Personnel Protection: Limit dose rates in one IR when beam sent to other IR or to the tune-up beam dump

    • Physics: Reduce the muon background in the detectors

Scheme of a muon wall installed in a tunnel widening which provides passage around the wall

Baseline configuration:

18m and 9m walls in each beamline

Global Design Effort


5m muon walls instead of 9 18m l.jpg

5m muon walls instead of 9+18m

  • 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 measured

  • 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 measurements

Global Design Effort


Slide9 l.jpg

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

Global Design Effort


On surface detector assembly ccr l.jpg

On-surface detector assembly CCR

  • According to tentative CF&S schedule worked out by M. Gastal, CERN, the detector hall is ready for detector assembly after 4y11m after project start

    • 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, CF&S and Detector concept groups.

  • CCB approved this CCR on 2nd November.

Global Design Effort


Cern lhc ilc engineering forum participation by mdi members oct 12 13 l.jpg

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. Meyners

  • Extremely useful information from CERN colleagues based on real experience.

Global Design Effort


Optimizing the design and tweaking it to understand its position w r to the optimum l.jpg

Optimizing the design and tweaking it to understand its position w.r.to the optimum

  • Since Vancouver, incorporated other cost saving changes

    • 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

Global Design Effort


Single ir questions l.jpg

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 developed:

  • 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 R&D resources

  • 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)

http://www-project.slac.stanford.edu/ilc/acceldev/beamdelivery/rdr/docs/push-pull/

Global Design Effort


Slide14 l.jpg

Single IR BDS (version 2006e)

e-

e+

  • Upgrade to 1 TeV CM involves adding magnets only … no geometry changes

  • Total BDS Z-length is 4452 m (2 IRs:5100m)

  • Removed dedicated energy error dianostics (MPS) and replaced with polarimeter chicane (some issues)

hybrid “BSY” (x 2)

14 mrad ILC FF9 hybrid (x 2)

IR

14 mrad

ΔZ ~ -650 m w.r.t. ILC2006c

2226 m

14 mrad (L* = 5.5 m) dump lines

M. Woodley et al

Global Design Effort


Bds with single ir l.jpg

BDS with single IR

BSY

Sacrificial

collimators

b-collim.

E-collimator

Diagnostics

FF

14mr IR

Tune-up dump

Extraction

Global Design Effort


Slide16 l.jpg

betatron

collimation

septa

MPS

coll

skew correction /

emittance diagnostic

polarimeter

fast

kickers

fast

sweepers

tuneup

dump

beta

match

final

transformer

polarimeter

energy

collimation

IP

primary

dump

energy

spectrometer

fast

sweepers

energy

spectrometer

final

doublet

Global Design Effort


Slide17 l.jpg

500GeV => 1TeV CM upgrade in BSY of 2006e

“Type B” (×4)

fast

kickers

septa

polarimeter

chicane

QFSM1

moves

~0.5 m

Magnets and kickers are added in energy upgrade

M. Woodley et al

Global Design Effort


Single ir bds optics 2006e l.jpg

Single IR BDS optics (2006e)

BSY

FF

Polarimeter

E-spectrometer

E-collimator

b-collim.

Diagnostics

Global Design Effort


Concept of single ir final doublet l.jpg

Concept of single IR Final Doublet

vacuum connection & feedback kicker

common stationary

cryostat

Detector

QD0

QF1

warm

IP

Original FD and redesigned for push-pull (BNL)

Redesigned FD

Global Design Effort


Ir magnets l.jpg

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

Global Design Effort


New optics for extraction fd push pull compatible l.jpg

New optics for extraction FD : push pull compatible

  • 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.

http://ilcagenda.cern.ch/conferenceDisplay.py?confId=1187

Global Design Effort


Extraction lines shortened by 100m l.jpg

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.

Global Design Effort


Concept of single ir with two detectors l.jpg

Concept of single IR with two detectors

detector

B

The concept is evolving and details being worked out

may be accessible during run

detector

A

accessible during run

Platform for electronic and services (~10*8*8m). Shielded (~0.5m of concrete) from five sides. Moves with detector. Also provide vibration isolation.

Global Design Effort


Detector systems connections l.jpg

Detector systems connections

detector service platform or mounted on detector

detector

low V DC for

electronics

high V AC

4K LHe for solenoids

low V PS

high I PS

electronic racks

4K cryo-system

2K cryo-system

gas system

2K LHe for FD

high P room T He

supply & return

sub-detectors

solenoid

antisolenoid

FD

high I DC for

solenoids

chilled water

for electronics

high I DC for FD

gas for TPC

fiber data I/O

electronics I/O

fixed connections

long flexible connections

move together

Global Design Effort


Push pull cryo configuration l.jpg

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

door

central part

Global Design Effort


Shielding the ir hall l.jpg

Shielding the IR hall

250mSv/h

Self-shielding of GLD

Shielding the “4th“ with walls

Global Design Effort


Working progress on ir design l.jpg

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

25m Height

9m Base

John Amann

Global Design Effort


Cfs layout for single ir central dr l.jpg

CFS layout for single IR & central DR

Global Design Effort


Slide29 l.jpg

CFS layout for single IR

Global Design Effort


Single ir push pull schedule l.jpg

Single IR – push pull schedule

  • The hardware can be designed to be compatible with a ~one day move, and this can be a design goal

    • 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 studied

  • BDS group will study the range between one day and one week and optimize the design versus cost, performance, reliability, etc.

Global Design Effort


Single ir push pull cost l.jpg

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

Global Design Effort


From summary of ccb response on single ir push pull l.jpg

From summary of CCB response on Single IR push-pull

  • “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 decision.

  • CCB recommends EC … to accept CCR#23, 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.”

Global Design Effort


Briefly on other systems l.jpg

Briefly on other systems

  • Magnets and PS

  • Vacuum system

  • Crab cavities

  • Beam dumps & collimators

  • IR hall, surface buildings & cranes

Global Design Effort


Magnets and ps l.jpg

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 stability

  • All BDS magnets in incoming beamlines except bends are on movers with 50nm step

  • Special magnets except FD and first extraction quads:

    • 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 solenoid)

    • Magnetized muon walls

Global Design Effort


Vacuum system l.jpg

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

Global Design Effort


Crab cavities l.jpg

Crab cavities

  • BDS has two SC 9-cell cavities located ~13 m upstream of the IP operated at 5MV/m peak deflection.

  • 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 collisions.

  • 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

Global Design Effort


18mw water dump design features l.jpg

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 window

    Vessel

  • 6.5m (18X0) water followed by 1m water-cooled Cu (22X0)

  • 1.5m diameter with vortex flow water, v=1.0-1.5 m/s , at r=30cm

  • 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

Global Design Effort


18mw dump design l.jpg

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 industry

  • RAL design included additions for window remote handling, air exchange and control, air drying and recovery, etc.

Global Design Effort


Ir surface area l.jpg

IR surface area

Global Design Effort


Included in ir hall and surface buildings l.jpg

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

Global Design Effort


Table of ir assumptions l.jpg

Table of IR assumptions

continued …

Global Design Effort


Summary l.jpg

Summary

  • 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.

Global Design Effort


Backup slides l.jpg

Backup slides

Global Design Effort


Slide44 l.jpg

500 GeV cm

1 TeV cm

Global Design Effort


Slide45 l.jpg

… continued …

Global Design Effort


Power cooling in bds l.jpg

Power & cooling in BDS

Table as of Valencia, 1TeV CM, two IR.

Table is as of 11/26/2006

9.768 + 0.862 + 2*18 MW => Power from Magnets, PS & Dumps to LCW

0.726 MW => Cables to Air=> approximately 60W/m in average

0.712 MW => PS to Air => taken out by Chilled water

Global Design Effort


Cost breakdown for single ir l.jpg

Cost breakdown for single IR

(Labor person-hours, such as installation, was converted to dollars to produce this chart)

Global Design Effort


Slide48 l.jpg

Beam Dump Vessel

Global Design Effort


Slide49 l.jpg

Beam Dump Service Cavern Layout

Global Design Effort


Slide50 l.jpg

If detector does not provide any radiation protection:

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

Wall

25 rem/hr

10m

Alberto Fasso et al

Global Design Effort


Ir hall radiation safety criteria l.jpg

IR hall radiation safety criteria

  • BDS produces and uses “ILC radiation guidance document”

    • 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 hr/year)

        • 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)

Global Design Effort


Slide52 l.jpg

Detector sizes & opening on beamline

2m

SiD (opened)

GLD

Since opening of detectors on the beamline is intended only for quick fixes, the required width for opening may be smaller that for opening off-beamline

Global Design Effort


Slide53 l.jpg

FD with L*=4.5m & 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

Global Design Effort


Instrumentation l.jpg

Instrumentation

  • 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

  • OTR, OTRI

  • Current monitors

  • Pickup phase monitors

  • Feedbacks

  • Polarimeter laser upstream & downstream

  • E-spectrometer

Global Design Effort


Ir coupling compensation l.jpg

IR coupling compensation

When detector solenoid overlaps QD0, coupling between y & x’ and y & E causes large (30 – 190 times) increase of IP size (green=detector solenoid OFF, red=ON)

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

antisolenoid

SD0

QD0

with compensation by antisolenoidsy/ sy(0)<1.01

Global Design Effort


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