KEK-SLAC Collaboration on
SuperKEKB
U. Wienands, SLAC
With material from M. Sullivan, S. Metcalfe, J. Wang, S. Novokhatski, J. Seeman

SLAC Experience:• Established electron/positron accelerator laboratory• Experience from PEP-II design and construction• Experience from nearly 10 years of running PEP-II
 Exceeding design peak luminosiy by a factor 4
 Exceeding design annual integral luminosity by a factor of 7

• Strong history of collaboration with KEK
 NLC/JLC/ILC
 Feedback and beam-diagnostics work
 Beam dynamics, beam-beam, electron-cloud, CSR, etc.

• Strong team of accelerator physicists and engineers.

2• Specific applicable experience Positron production- SLC e+ source and its components (Flux Concentrator)

 Luminosity feedback- Fast dither feedback @ PEP-II Beam collimation- Fixed & moveable collimators, system simulation, top-up injection diagnostics

 Bunch-by-bunch feedback- Established leader Accelerator physics and beam commissioning- Strong accelerator physics group with experience on real machines3

What is SLAC looking for?
• Maintain and contribute SLAC strengths in ring collider design A number of projects on the horizon (besides SuperKEKB),
some still far away:-LHC upgrades (through LARP)
Muon Collider (through MAP)
US contribution to ILC (in Japan?)
Ultimate storage ring as a light source (e.g. PEP-X).
Ring-collider Higgs Factory (? CERN)• Leverage US contribution to BELLE-II.
 There are several US institutions involved in BELLE II
 Hopefully, SLAC can help make high luminosity faster.

• Enhance US-Japan R&D collaboration. Leverage the USJapan funding by providing accelerator physics support.
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Areas for collaboration (Oide)

5Conveners

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Example: Transverse Deflector Cavity for SuperKEKB

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Example: Beam Collimators & HOM Absorbers

HER 27-m collimator

HOMAbsorberBellows

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Example: Fast Dither Luminosity Feedback
Drive ckt

Dither coil

FLUM in action
Lumi
SignalSpectrum9

Funding Issues• US-Japan funds can provide for hardware andmanufacturing.
 With KEK support a proposal has been submitted for JP-FY13.

• Accel. Physics to be funded by DOE OHEP.
 SLAC has made the case to DOE and is seeking concurrence toto fund this opportunity in US-FY13 and US-FY14. A decision ispending.
 SLAC has proposed to DOE a budget for US-FY15 and beyond
to support increased effort.
- This will be geared towards beam-commissioning and upgrades- Energy measurement by Compton scattering?
- Polarization??

10Status• SLAC has asked J. Seeman & U. Wienands to be thecentral points of contact for SuperKEKB collaboration.
• We are meeting ≈ twice a month via SeeVogh.
• A list of “convenors” (POCs) on both sides has been
established.
• Two groups of visitors from KEK have been at SLAC
recently: Linac and e+ source issues
 Beam collimation and HOM absorption• Ongoing work to define scope and effort.

11Potential SLAC-SuperKEKB Projects
Project

Scope ofSLAC work(near term)

Coordinator

StartCollaborators(pending funding)(tentative)

IP feedback

Revive and augment
simulation code.
Establish performanceand requirements for
feedback elements.

U. Wienands

soon

U. Wienands, M. Sullivan,
S. Gierman, A. Fisher, J.
Fox

Linac BPMs

Review designs. If
SLAC design chosen;scope project

S. Smith,
D. van Winkle

May 2013

pending scope definition

Beam Collimation

Simulate KEK systemincl. injection. Review
collimation hardware.
Review HOM sitution.

U. Wienands(acting)

pending scope
definition

U. Wienands, S.
Novokhatski; E. Bong, S.
Metcalfe (eng)

Flux Concentrator

Specify, design

J. Sheppard

pending scope
definition

pending scope definition

Accelerator
Physics

Beam dynamics
Studies, Beamcommissioning

Y. Caisoon

G. Stupakov, L. Wang
(CSR), tbd

Bunch-by-Bunch
Feedback

Methods tocharacterize GHz
power amps; clock
synchronization tech.
development

J. Foxongoing

J. Fox + students +post doctoral fellow.

12Summary• Mutual interest in collaboration on SuperKEKB
 “Make high luminosity faster”• We have defined the immediate needs of SuperKEKB,
and the applicable resources at SLAC.
• Funding is being pursued on both sides (US-JPN; DOE)
 Cast in form of “Projects” to facilitate discussion with OHEP

• We expect accelerator physics-related work to start fairly
soon; hardware to come once the funding situation isclearer.

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