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ILC Interaction Region and Machine Detector Interface. Andrei Seryi, SLAC. representing BDS Area leaders Deepa Angal-Kalinin, Andrei Seryi, Hitoshi Yamamoto MDI panel and BDS team. Contents.

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slide1

ILC Interaction Region and

Machine Detector Interface

Andrei Seryi, SLAC

representing

BDS Area leaders

Deepa Angal-Kalinin, Andrei Seryi, Hitoshi Yamamoto

MDI panel

and BDS team

Global Design Effort

contents
Contents
  • Will describe design of Beam Delivery System, focusing in particular on Machine Detector Interface aspects
    • IR hall and surface buildings
    • Detector assembly
    • Machine background
    • Design of IR and detector
    • IR arrangements for two detectors

Global Design Effort

bds layout
BDS layout

Global Design Effort

slide4

IR hall region

Global Design Effort

bds beam line layout
BDS beam-line layout

Polarimeter

BSY

Sacrificial

collimators

b-collim.

service tunnel

E-collimator

Diagnostics

FF

14mr IR

Tune-up dump

5m

E-spectrometer

Muon wall

Extraction

-2.2km

Global Design Effort

bds optics
BDS optics

IR

linac

Upstream polarimeter; b & E –collimation ; Energy spectrometers

are of particular MDI interest

Global Design Effort

bds parameters
BDS parameters

Global Design Effort

slide8

On-surface assembly of ILC detectorsCMS 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

ilc underground schedule
ILC Underground schedule

Earlier version of layout

Global Design Effort

on surface assembly of ilc detectors
On-surface assembly of ILC detectors
  • Adopted CMS on-surface assembly approach for ILC detector
    • This allows saving more than two years and fitting into the goal of “7years until first beam” and “8years until physics run”
  • CMS assembly and lowering the detectors parts in the hall is presently ongoing, according to the plan
    • Information and images on next pages are courtesy of CERN colleagues Alain Herve, Martin Gastal, et al.

Global Design Effort

cms assembly
CMS Assembly

Global Design Effort

cms assembly1
CMS Assembly

Global Design Effort

cms assembly2
CMS Assembly

Global Design Effort

cms assembly3
CMS Assembly

Global Design Effort

cms assembly4
CMS Assembly

Global Design Effort

cms assembly5
CMS Assembly

Global Design Effort

cms assembly6
CMS Assembly

Global Design Effort

cms assembly7
CMS Assembly

Global Design Effort

cms assembly8
CMS Assembly

February 1. Lowering down a 1200 ton barrel ring. Photo and info courtesy Alain Herve

Global Design Effort

cms assembly9
CMS Assembly

Lowering down a 1200 ton barrel ring

CMS is at half process. Next -- lowering 2kt central barrel by the end of February. Alain Herve

Global Design Effort

optimization of ir hall and assembly procedure
Optimization of IR hall and assembly procedure
  • For RDR, discussing possible variations of assembly procedure
    • pure and modified CMS assembly (configs. A and B in the table on next slide)
      • Difference being how large pieces are assembled on surface
  • Present RDR does not intend to finalize all the details for the schedule, hall sizes, capacity of cranes, etc.
  • Optimization will be done in details by BDS, CF&S and Detector concept groups in EDR phase

Global Design Effort

table of ir assumptions
Table of IR assumptions

continued …

Global Design Effort

slide23

… continued …

Global Design Effort

included in ir hall and surface buildings
Included in IR hall and surface buildings:
  • IR hall:
    • detectors hall of 120x25x39m
    • service cavern 40x15x10m
    • finished civil engineering works, plus
    • movable concrete 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:
    • two assembly buildings 100x25x25m
    • 400t and 20t overhead cranes
  • This choice can suite some detectors better than other (one size does not fit all) and may cause some concerns
  • Further adjustments of IR hall and surface buildings will be done, in close connection with detector colleagues, during EDR phase

Global Design Effort

ir surface area
IR surface area

Global Design Effort

next slides
Next slides
  • Will discuss
    • Machine background
      • muons
      • Synchrotron Radiation
      • Beam-gas
      • Extraction line losses
    • IR design
      • Detector Integrated Dipole (DID)
      • Antisolenoids

Global Design Effort

bds layout possible sources of muons
BDS layout & possible sources of muons

SP2

SP4

betatron

collimation

septa

MPS

coll

skew correction /

emittance diagnostic

polarimeter

fast

kickers

fast

sweepers

tuneup

dump

beta

match

final focus

polarimeter

energy

collimation

SPEX

IP

primary

dump

energy

spectrometer

fast

sweepers

clean-up

collimators

muon wall

energy

spectrometer

final

doublet

Global Design Effort

muon reduction
Muon reduction

N.Mokhov et al., FNAL

  • Muon flux in BDS & IR with and without 5m muon wall
  • Allows reducing flux in TPC to a few m per ~100 bunches

5m wall

Global Design Effort

muon walls
Muon walls
  • Purpose:
    • Personnel Protection: Limit dose rates in IR when beam sent to the tune-up beam dump
    • Physics: Reduce the muon background in the detectors

5m muon wall installed initially

If muon background measured too high, the 5m wall can be lengthened to 18m and additional 9m wall installed

(Local toroids could be used also)

Global Design Effort

beam gas sr in ir
Beam gas & SR in IR
  • Beam gas
    • is minimized by controlling the pressure near IP within 1nTorr level, 10nTorr in 200-800m from IP and ~50nTorr in the rest of the system
  • SR in IR
    • due to upstream collimation is contained within a defined cone which is extracted away

Example of SR rays from beam halo in IR apertures

F.Jackson, et al

Global Design Effort

extraction lines
Extraction Lines

nominal parameters

(500 GeV CM)

Y.Nosochkov, et al

optional

high L parameters

(500 GeV CM)

  • Losses for the nominal case are negligible (~1W for 200m from IP)
  • Even for High L parameters is within acceptable levels
  • Small losses in extraction and separation from dump are important to keep the back-shine low

Global Design Effort

anti did coils
Anti-DID coils

-5 -3 -1 1 3 5m

Two overlapping Detector Integrated Dipole coils create field flattened in the IR region

B.Parker, et al, BNL

Application of anti-DID to guide pairs to the exit hole

Global Design Effort

antisolenoids
Antisolenoids
  • Antisolenoids for local compensation of beam coupling
  • Depend on all parameters (L*, field, sizes, etc) and is a delicate MDI issue

SiD with L*=4.5m

LDC with L*=4.5m

QD0

Example of optimal field for local compensation of coupling (SiD, L*=3.5m)

B.Parker, BNL

Global Design Effort

arrangements for two detectors
Arrangements for two detectors
  • IR design
  • Shielding
  • Moving the detectors
  • Services
  • Opening
  • Connections
  • etc

Global Design Effort

ir conceptual design
IR conceptual design

Detector

Move with detector

Stay fixed

Warm space for vacuum valves for disconnect

B.Parker, et al, BNL

Global Design Effort

ir magnet design
IR magnet design

Shield ON

Shield OFF

Actively shielded QD0

Intensity of color represent value of magnetic field.

Active shielding demonstration

Global Design Effort

generic detector ir details
Generic Detector - IR Details

Steel Yoke

(no yoke for 4th)

Antisolenoid

Solenoid

BeamCal

ECal

HCal

Low Z

Mask

TPC or

Si Tracker

FD Cryostats

Detectors

Working progress

John Amann, et al

LumiCal

Vertex Detector

IP Chamber

Global Design Effort

generic ir layout
Generic IR layout

Vertex Detector

Mask

Beam Cal

QD0

Space for

Feedback Kicker

IP Chamber

OC0

LumiCal

Detectors

SD0

FD Cryostat

Group 1

Valves for Push Pull

QF1

QDEX1

SF1

OC1

Warm Beam Pipes

FD Cryostat

Group 2

QFEX2

Global Design Effort

ir forward region and chambers
IR forward region and chambers
  • Watch in study & design:
    • integration; support; assembly; wake-fields and EMI; location of BPMs; vacuum & pumping; cold-warm transitions; etc.

Global Design Effort

shielding the ir hall
Shielding the IR hall

250mSv/h

Self-shielding of GLD

Shielding the “4th“ with walls

Global Design Effort

working progress on ir design
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

slide42

Beamline shielding

Pac Man Open

Illustration of ongoing work… Designs are tentative & evolving

Recessed Niche

Pac Man Closed

Beam Line Support Here

John Amann

Global Design Effort

slide43

Beamline shielding

CMS shield opened

Looking into experience of existing machines…

pacman opened

SLD pacman closed

pacman opened

door tunnel

pacman closed

Global Design Effort

slide44

Air-pads at CMS

  • Single air-pad capacity ~385tons
  • Air-pads equipped with hydraulic jack for height adjustment & service
  • Lift is ~8mm for 385t units
  • Steel plates (~4cm) on the floor (compressed air 50bars)
  • Inclination of ~1% of LHC hall floor is not a problem
  • Last 10cm of motion on grease pads
  • [Alain Herve, et al.]

Photo from the talk by Y.Sugimoto, http://ilcphys.kek.jp/meeting/lcdds/archives/2006-10-03/

14kton ILC detector would require ~36 such air-pads

Global Design Effort

slide45

Displacement, modeling

Idealized models

Short range deformation (~0.1mm) is very similar in both models.

Long range (1/r) deformation (~0.3mm) is not seen in ANSYS because too thin slab in the model

More details (3d shape of the hall, steel plates on the floor, etc.) to be included.

Long term settlement, inelastic motion, etc., are to be considered.

Parameters: M=14000 ton; R=0.75m (radius of air-pad); E=3e9 kg/m^2, n=0.15 (as for concrete); Number of air-pads=36

Analytic model, half-space

ANSYS model

J.Amann, http://ilcagenda.cern.ch/conferenceDisplay.py?confId=1225

Global Design Effort

hilman rollers is also a possibility
Hilman rollers is also a possibility
  • For pre-determined path of motion for detector exchange, Hilman rollers may be suitable
  • Standard capacity to 1kton
  • While not standard items, the 5kton capacity rollers have been manufactured
  • Durability is important and to be studied

Contact Roll

Roller Chain Links

5000 ton module will have

51 contact rolls in 3 rows of 17

Global Design Effort

other considerations
Other considerations

Hydraulic Jacks/Shims

  • Hydraulic jacks for adjustment
  • Drive systems
  • Guiding mechanism
  • Alignment, etc

Screw type drive system

Global Design Effort

detector support
Detector support
  • Detector may have a supporting platform
    • size of IR hall increased to allow for this

Global Design Effort

concept of ir hall with two detectors
Concept of IR hall 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

concept of detector connections
Concept of detector 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

concept of cryo configuration
Concept of cryo configuration

Need to be optimized for fast switch of detectors in push-pull and fast opening on beamline

QD0 part

QF1 part

This scheme may 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 (MDI negotiation issue!) than what could be done in off-beamline position

door

central part

Global Design Effort

finishing up
Finishing up…
  • Machine Detector Interface issues which require careful balance of very different constrains from Detectors and Machine
    • IR design, FD, support, connections, alignment
    • Detector design, opening, movements
    • Backgrounds, machine and beam related
    • Conventional facilities
    • Stability
    • Services
    • Radiation safety
    • etc

Global Design Effort

summary
Summary
  • Interaction Region is a machine area where balance of design constraint from many groups is especially important
  • The Beam Delivery Design group is looking forward to work on IR design together with Detector colleagues in the EDR phase of ILC

Global Design Effort

thanks
Thanks
  • BDS design team
  • MDI panel
  • Detector colleagues
  • Push-Pull evaluation task-force
  • Colleagues from LHC, CERN
  • All colleagues involved in BDS & MDI work

Global Design Effort