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ATF/ATF2 experiment and BDS program. Andrei Seryi, SLAC American Regional Team leader for BDS Deputy of ATF Spokesperson for ATF2 Global Design Effort technical area leader for BDS. Plan of the presentation. FY2007 accomplishments New strategy, criteria & plan in TDP I & II

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ATF/ATF2 experiment and BDS program

Andrei Seryi, SLAC

American Regional Team leader for BDS

Deputy of ATF Spokesperson for ATF2

Global Design Effort technical area leader for BDS

SLAC Annual Program Review

Plan of the presentation l.jpg
Plan of the presentation

  • FY2007 accomplishments

  • New strategy, criteria & plan in TDP I & II

  • FY2008 achievements

  • FY2009 resources

  • Five years plan

SLAC Annual Program Review

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FY2007 accomplishments

  • BDS design work

  • Progress in construction of ATF2 facility

  • Design & prototype of crab cavity system

  • MDI instrumentation studies at ESA facility

  • Detailed design of SC Final Doublet and prototype development

  • Progress with Interaction Region integration efforts by machine and detector groups

  • Organization of BDS international team & resources for TDR phase design

SLAC Annual Program Review

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BDS RDR design

IR Integration

grid: 100m*1m









Final Focus

Tune-up & emergency Extraction

14mr IR

Tune-up dump

Muon wall

Main dump



Crab cavity

SLAC Annual Program Review

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Beamline, January 2008

May 2008

Summer 2007


Model of ILC final focus


ATF2 goals :

(A) Small beam size ~37nm

(B) nm stability of beam center

  • ATF international collaboration: MOU signed by 20 institutions

  • ATF2 constructed as ILC model, with in-kind contributions

  • Start of beam commissioning: October 2008

FD integration

SLAC Annual Program Review

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Crab Cavity

UK-FNAL-SLAC crab-cavity collaboration

3d simulations by SLAC ACD

FNAL 3.9GHz transverse cavity achieved 7.5 MV/m

Challenges: damping of parasitic modes, tight phase stability, integration into IR

SLAC Annual Program Review

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MDI instrumentation @ ESA


BPM energy spectrometer

Synch Stripe energy spectrometer

Collimator design, wakefields

IP BPMs/kickers—background studies

EMI (electro-magnetic interference)

Bunch length diagnostics

SLAC Annual Program Review

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  • Challenges:

  • Optimize IR and detector design ensuring efficient push-pull operation

  • Agree on Machine-Detector division of responsibility for space, parameters and devices

IR integration

(old location)

SLAC Annual Program Review

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  • Initiated and organized very successful IR engineering workshop

SLAC Annual Program Review

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IRENG07: SC final double & its cryo system

Great progress (2007) on consistent design of the SC Final Doublet, suitable for push-pull operation ( “IR Eng. workshop, IRENG07”)

Brett Parker et al


SLAC Annual Program Review

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IRENG07: Optimization of Push-Pull design


Alain Herve, CERN, et al

SLAC Annual Program Review

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BDS strategy

In TDP I & II plan, the scope of work changed, and the focus is shifted

Earlier planned detailed design & engineering will not be performed

  • Focus on a few critical directions. Selection criteria:

    • Critical impact on performance versus cost;

    • Advanced ideas promising breakthrough in performance;

    • Broad impact and synergy with other worldwide projects

beam dump

photon collider

crystal collimation

crab cavity

MDI diagnostics …

Areas of key ART involvement indicated in bold font

SLAC involvement

  • Three critical directions:

    • General BDS design

    • Test facilities, ATF2

    • Interaction Region optimization

ATF2 commissioning & operation

Develop methods to achieve small beam size

Diagnostics, Laser Wires, Feedbacks …

IR interface document & design

SC FD prototyping and vibration test

ILC-like FD for ATF2 …

SLAC Annual Program Review

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FY2008 achievements

  • ATF2 progress

    • Delivery of committed hardware to ATF2 and its commissioning (HA PS; FD; BPM electronics)

    • Initiated innovative Flight Simulator framework

  • Beam dump design

    • started new collaboration with India, BARC

  • Started development of “Interaction Region Interface Document”

  • Developed R&D plan for photon collider option

  • Initiated synergy explorations

    • CLIC BDS design

    • LHC crab cavity design

    • Crystal collimation

  • Engaged in cost reduction explorations

SLAC Annual Program Review

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SLAC contributions to ATF2

  • Hardware

    • 2 FFTB quads modified for FD

    • 2 FFTB sextupoles modified for FD

    • 3 SLC sextupoles modified for FF

    • 3 FF bends built by IHEP for SLAC, SLAC design

    • ~ 20 FF quadrupoles built to SLAC design and QC spec

    • ~30 refurbished FFTB movers

    • HA power supplies for ~30 magnets

    • BPM electronics for ~40 cavity BPMs

    • upgraded ODR monitor

    • upgraded FFTB wire scanner for IP

  • Design, operation and commissioning

    • several people * 2-3 time per year at KEK + remote participation

SLAC Annual Program Review

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High Availability Power Supplies

High Availability Power Supplies delivered, installed, connected and tested at ATF2 (May 2008)

SLAC High Availability Power Supplies are applicable to many future projects such as NSLS-2, LCLS…)

SLAC Annual Program Review

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ATF2 final doublet





































SLAC FD magnets at LAPP, June 2008

Modified FFTB quads* and sextupoles delivered to LAPP, Annecy, for final integration and stability study

*) modification involved increase of aperture and adjusting pole shape with shims



SLAC Annual Program Review

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Cavity BPMs

Cavity BPMs and SLAC front-end electronics modules will provide sub-micron resolution of beam position at ATF2

ATF2 is one of the first beamlines to rely only on cavity BPMs

Experience applicable to LCLS cavity BPM system, etc

May 2008

Prototype at PAL

SLAC Annual Program Review

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ATF2 “Flight simulator”

Remote participation, first used for ATF in 2007, is used more and more, and facilitate participation of collaborators in ATF2 work

Flight Simulator address the next challenge: creating a method how collaborators can contribute to development of tuning tools without being at ATF and without connection to ATF control system

SLAC-KEK remote participation shift for BBA at ATF ring

Glen White (LAL / SLAC)

FS based on Matlab and Lucretia accelerator toolbox

First tests of FS performed in May 2008

For details, see ATF2 Software review workshop, June 2008, LAL, Orsay

SLAC Annual Program Review

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Beam dump design

Initiated collaboration with BARC, India, on beam dump design

Ongoing work on optimization of design for 17MW dump

Computational fluid dynamics study of heat removal by water vortex. Color map show temperature increase of 30 C. BARC

Dieter Walz, Ray Arnold, Satyamurthy Polepalle (BARC, India), John Amann, at SLAC beam dump area (February 2008)

SLAC Annual Program Review

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IR integration

  • Machine – Detector work on Interface issues and integration design is a critical area and a focus of efforts

  • IR integration timescale

    • EPAC08 & Warsaw-08

      • Interface document, draft

    • LCWS 2008

      • Interface doc., updated draft

    • LOI, April 2009

      • Interface document, completed

    • Apr.2009 to ~May 2010

      • design according to Interface doc.

    • ~May 2010: LHC & start of TDP-II

      • design according to Interf. doc and adjust to specific configuration of ILC


SLAC Annual Program Review

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Discussed approach to CLIC stability

LHC-CC designs, Z.Li, L.Xiao, et al, SLAC

Volume reflection radiation of 200GeV e+ or e- on 0.6mm Si crystal (Rbend=10m)

Yu. Chesnokov et al, IHEP 2007-16




Synergy explorations

  • CLIC BDS design

    • BDS/MDI design

    • Stability study

  • LHC crab cavity design

    • ILC-LHC initiative: Oct. 2007

    • Ongoing collaborative design

  • Crystal collimation

    • Potential for more robust & shorter collimation system

    • Application as photon source

SLAC Annual Program Review

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Merged dumps

Min BDS 500GeV CM


Simplified IR

Cost reduction explorations

SLAC Annual Program Review

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BDS in GDE Technical Design Phase plan


contributions highlighted

SLAC Annual Program Review

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FY2009 resources

  • Allow continuation of work where ART & SLAC possess essential leadership and expertise and unique facilities

  • Direct benefits: maintain leadership in key areas of US expertise, needed to reach the energy frontier

  • Indirect benefit: synergy with US science

    • ATF2: advanced accelerator study and beam handling applicable to any single path beamlines such as LCLS, XFEL…

    • Instrumentation, high availability power supplies, etc., are applicable to many future projects such as NSLS-2, LCLS…

    • IR and and FD design: synergy with LHC IR upgrade and Super-B IR

    • Collimation and crab cavity research: synergy with LHC

SLAC Annual Program Review

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BDS five year plan

BDS design for specific chosen configuration of ILC

Beam delivery overall design

Collimation, beam dump, crab cavity …

BDS subsystems studies at FACET

tests & studies of

subsystems designed for specific configuration


BDS prototype

commissioning & accelerator physics study

IR and FD

design for the specific ILC configuration

IR Integration

Final Doublet SC prototype

Vibration & stability study


tests at ATF2








SLAC Annual Program Review

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  • RDR design of BDS was produced by international team with essential contribution of ART & SLAC

  • In TDP I and II, the strategy has changed

  • BDS activities are focused on three critical directions

  • Focus on key areas of US & SLAC expertise

  • Direct and indirect benefit for US science

  • BDS plans are integrated into TDP

SLAC Annual Program Review