WG5 Cavities Topics as listed by organizers

1
WG5 Cavities Topics as listed by organizers

• Cavities (Baseline and Hi Gradient RD)
• Materials RD
• Input coupler
• Tuners
• Fabrication
• Processing (including.EP, HT)
• String Assembly
• Industrialization
• These noted by in what follows

2
Work plan

• Before Snowmass
• Preliminary Strawman choice for baseline
  recommendation (BCD)
• And alternative(s) for Alternate Configuration
  Design (ACD)
• Baseline NEED NOT be present existence proof
• Enumerate justification of baseline and
  alternatives
• Pros and cons of choices, technical
  advantages/disadv
• Potential Mods or improvements to choices
• Technical advantages, Increased technical
  potential
• Potential cost reductions
• Risk and reliability impacts
• RD necessary and time scale
• Of the baseline
• Of alternatives to supersede baseline status.

3
Proposed methodology

• We propose to put forward a set of preliminary
  reference design parameter choices and
  prioritized alternatives prior to the meeting.
• In the discussion/ presentation sessions we will
  ask for people who do not believe a particular
  reference selection correct, that they present
  arguments for alternative to the selected
  choice.
• Improvements to and needed design reviews of the
  choice would follow
• This discussion would be followed by discussions
  of alternative options and their priority, and
  importance. Leading to an RD plan
• For instance -

4

• Steps for design convergence and RD plan
• ? Put out a draft of tentative parameter items
  choices Prior to Snowmass
• ? Encourage people to make arguments that other
  alternatives are better for base line choice
• ? Change selection if appears justified-consensus
  
• o make lists of pros cons
• ? Discuss work to be done or to be reviewed on
  the primary choice (its RD)
• ? Discuss and prioritize other options
• ? Outline their needed RD
• Identify potential cost reduction, technical
  risk, technical advantages, increased potential

5
Schedule at Snowmass

• Agenda WG 5 Week one Aug 15- 19
• Tues Day 2 60, 120, 90 (what do the numbers
  mean?)
• WG 2- Mod, Kly, llrf, RF dist
• WG 5-
• ? Review of strawman for BCD,
• ? Cavities, geometries?
• ? Gradient and Q0 RD goals LC spec,
• ? Fab, Processing
• ? Industrialization
• Resources of cavity test

6

• Wed Day 3 120, 120, GG90
• WG 25 Cryo module, Couplers.., Cryo temp opt
• WG 2 5? with GG3 (availability- Cryo systems,
  tunnel layout, modulators)
• WG5 and 2? with GG1? on gradient issues, and
  packing factor/ slot length?
• Thurs Day 4 120, 120, GG90
• WG 5
• Morning-
• Materials RD and basic research towards BCD
  and ACD
• tuners (including step motors), and mag
  shielding
• Afternoon
• Draft Conclusions - some with WG2?
• WG5 with GG availability, tuners, ??

7
Criteria

• Baseline recommendation
• Need not be an existing design, but should be
  either
• A mature design or procedure
• A modification easy to extrapolate to without
  significant RD program
• A design or procedure, though not completely
  certified, likely to be the one of choice
• One for which costing with contingencies is
  possible or available
• One with such significant benefit over existing
  concept to warrant its choice
• Should have a clearly defined RD path to bring
  to credible stage

8
Criteria cont1

• Primary alternative to baseline
• Design or concept warranting aggressive RD
  effort.
• Likely to overtake baseline if pursued
• Likely to have significant technical or cost
  advantages
• Define RD required to bring to credible stage

9
WG5 Cavities Topics

• General parameters concepts
• Gradient Q
• Goal for cavity RD
• Specification for ILC 500
• Reserve
• Reliability Risk
• Cost- benefit
• Linac packing factor
• Cavity types
• Needs evaluations of all aspects.
• TESLA -Mods to TESLA?
• Beam pipe length diameter
• HOM and pickups
• Helium vessel Conical end
• End group cooling, end group design
• Flanges and Sealings
• General design cleanup

10
WG5 topics cont 1

• Cavity types continued
• Low loss - impact of smaller iris?,cell to cell
  coupling, beam dynamics , alignment tolerances
• Reentrant- or hybrid reentrant - cleaning
  structural
• Other variants
• Superstructure
• Hi Gradient RD
• Processing
• BCP w Ti 1200C, EP, mechanical grinding, 120
  bake
• BCP w single crystal, or large grain
• Understand process parameters to reduce spreads
• Discuss paths toward industrialization
• Processing toward industrialization (see
  industrialization)
• Margin qualification specifications
• What gradient margin, Q margin
• What dark current and x-rays
• Risks - vacuum accidents

11
WG5 topics cont 2

• Materials RD
• Do we need 1300 C Ti treatment?
• Single large grain
• Connection w processing
• Nb/Cu
• Basic reaserch
• Q improvements
• Fabrication
• E beam
• Hydroform
• Spin
• Tolerances
• End groups - can one improve fab efficiency?
• Industrialization
• Key issues toward
• A plan and schedule
• Quality control reproducibility

12
WG5 topics cont 3

• Tuners
• Types mechanical
• End type Saclay
• Blade type
• Coaxial
• Other
• Piezo (range for highest gradient?)
• Magnetostrictive
• Motors- warm vs cold
• Magnetic shielding

13
WG5 with WG2 topics cont 4

• Input couplers
• Varieties
• New ideas
• Processing
• Cost drivers
• RD for cost or processing
• CryoModule
• The string bellows, GVs, HOM abs, BPM/Quad
• The quad/BPM location
• Cavity slot length
• Cavity module Interconnect and their real
  estate
• Generic module types
• With quad/ without q/ separate quad module

14
Cavities WG5 key people

• DESY
• Dieter Proch
• Lutz Lilje
• W-D Moeller
• R Brinkmann
• Detlef Reschke
• J Sekutowicz
• KEK-Japan
• Kenji Saito
• Toshiyasu Higo
• Yasuo Higashi
• Eiji Kako
• Shuichi Noguchi
• Hiroshi Matsumoto
• Sergey Kazakov
• Kenji Ueno

• JLab
• Peter Kneisel
• Bob Rimmer
• Charles Reece
• Jean Delayen
• Warren Funk

This is just a first attempt at trying to
identify people from the overall list. As I
dont know people at some Labs well there may be
gross oversites Or errors For instance Cornell???
15
Cavities WG5 key people cont 1

• FNAL
• Pierre Bauer
• Harry Carter
• H Edwards
• Mike Foley
• Don Mitchell
• Nikolay Solyak
• SLAC
• Chris Adolphsen
• J Cornuelle
• Saclay/Orsay
• Terry Garvey
• O Napoly

• Cornell
• Hasan Padamsee (2nd week)
• Mathias Liepe
• Rongli Geng
• INFN
• Carlo Pagani
• Industry
• Michael Peiniger
• Tony Favale
• Tony Nelson?
• Other
• John Corlett
• Brian Rusnak

16
Couplers (with WG5)Chris Adolphsen transp

• FNAL
• Nikolay Solyak
• Don Mitchell
• KEK
• Hiroshi Matsumoto
• Sergey Kazakov
• Shuichi Noguchi
• Eiji Kako
• Cornell
• Sergey Belomestnykh
• LLNL
• Brian Rusnak
• Orsay
• Terry Garvey
• Alessandro Variola
• DESY
• W-D Moeller

• Progress in processing TTF3 couplers at Orsay
• Status of new designs
• Plans for characterizing coupler performance for
  35 MV/m operation
• Modeling of coupler multipacting
• Proposed tests to understand the coupler
  processing limits
• Coupler plans for the XFEL
• ILC industrialization and cost issues

17
Cryomodules (with WG5) Chris Adolphsen transp

• FNAL
• Harry Carter, Tug Arkan, Cristian Baffo, Don
  Mitchell, Nikolay Solyak, Andrew Hocker, Helen
  Edwards
• Tom Peterson (or Tom Nicol) ?
• JLAB
• Warren Funk, Peter Kneisel, Jean Delayen, Rimmer,
  Reece, Preble
• Cornell
• M. Liepe
• DESY
• Lutz Lilje, Carlo Pagani, Dieter Proch, Detlef
  Reschke, B. Peterson
• KEK
• Shuichi Noguchi, Kenji Saito, Fumio Furuta,
  Yuichi Morozumi, Toshiyasu Higo, Eiji Kako,
  Norihito Ohuchi

• Status of TTF cryomodules
• Design changes for XFEL-cryomodules
• Design changes for the ILC
• Schedule for TTF/XFEL/SMTF prototypes
• Industrialization of the XFEL cryomodules
• Identification of critical requirements
• Existing and planned cryomodule infrastructures
• Cryomodule integration issues
• Separate Quad / Cavity sections
• Adoption of international standards

18
Baseline Configuration Document Chris Adolphsen
transp

• At Snowmass, outline linac choices, giving pros
  and cons for various items or specifying those
  to which there is general agreement

• Quad and BPM package
• Integrated at center
• Integrated at end
• Separate
• Quad
• Cos(2Phi) 80 mm bore
• Superferric 40 mm bore
• BPM
• Narrow band cavity
• Wide band
• Cryo Cooling Issues
• Segmentation
• Shield temperatures
• Overhead
• Other
• Modulator/Klystron Cooling
• Tunnel Electronics

• Tunnel Layout
• Cut and Cover
• TDR like
• Deep (gt 20m) Tunnels
• Modulators
• Pulse Transformer
• Marx Generator
• Other
• Klystron
• Power Level
• Multibeam tube
• Sheet beam tube
• Other
• RF Distribution
• TDR like
• Other configurations

• Coupler
• TTF3
• Higher power variation
• Waveguide like
• Cavity Design
• TDR
• Low Loss
• Cavity Gradient
• 25, 30, 35 MV/m
• Dark current limits
• Cavity Tuners
• End
• Blade
• Other
• Cavities per Cryomodule
• 8 to 12