ILC Program at SLAC

1
ILC Program at SLAC

• Nan Phinney
• SLAC DOE HEP Review
• July 7 9, 2008

2
P5 Report on ILC

• The international particle physics community has
  reached consensus that a full understanding of
  the physics of the Terascale will require a
  lepton collider in addition to the Large Hadron
  Collider.
• SLAC has been committed to a TeV scale linear
  collider for nearly 3 decades
• SLC the 1st and only LC operated from 1988-98
• NLC/GLC X-band design developed with KEK
• ILC SC L-band design led by the GDE

3
SLAC role in RDR -gt EDR

• SLAC extensive expertise in LC design meant SLAC
  led
• 5 of 6 area systems, some key technical systems
• SLAC also had a major role in producing the RDR
  document
• Chief editor, wrote or rewrote many sections,
  tech pubs
• For EDR, SLAC was to narrow focus and lead
  engineering design and costing of
• Electron source laser, photocathodes, optics
• Beam Delivery System optics, diagnostics, IR
  integrn
• RF sources modulator, klystron, RF distn,
  couplers
• Linac system design optics, diagnostics,
  tuning
• Work on positron source RTML transfered to
  others

4
FY08 post-Omnibus bill

• ILC-specific design engineering was stopped and
  effort was diverted to more generic RD
• Given new ILC timescale cut back engineering
  CFS, but positioned ourselves to resume ILC work
  in FY09
• Much RD had broad applicability
• L-band RF sources for Project-X, ERLs, any SC
  linac
• BDS ATF2 for future IRs, crab cavities for LHC
• Electron cloud for LHC, SPS, Super-B, etc.
• High Availability controls for Project-X, etc.
• Laser photocathode RD for future e- sources
• RF modeling wakefield simulations

5
Linear Collider Department

• Faculty
• T. Himel
• J. Paterson
• Permanent PhD
• C. Adolphsen
• A. Brachmann
• R. Larsen
• C. Nantista
• J. Ng
• N. Phinney
• M. Pivi
• P. Tenenbaum
• A. Seryi
• J. Sheppard
• C. Spencer
• M. Woods

Fixed Term PhD R. Arnold L. Wang G. White F.
Zhou Technical Staff J. Amann B. McKee J.
Tice M. Woodley Postdoc S. Molloy S. Pei F.
Wang
Part time/other dept On leave
6
Overview of Financial Data FY2008
Chart is Q1 staff distributions layoffs mainly
engineering tech staff
7
Current LC RD Efforts

• Electron source
• Electron cloud mitigation
• L-band RF power sources
• BDS and ATF2
• High Availability hardware
• Systems Integration

8
DC Gun Test Lab at SLAC

• Measurements of QE Polarization and Charge limit
• System is operational after long down time
• First measurements of QE and charge limit of
  InGaAS/GaAs cathodes

InAlGaAs/AlGaAs 85 Spin Polarization
9
e- Source Laser Development

• Cryogenic amplifier chamber has been acquired and
  is in the process of installation

Cryogenic chamber containing TiSapphire crystal
10
Positron Source Design

• RDR effort included
• overall layout optics design
• target yield damage calculations, remote
  handling
• NC capture structure prototype
• collimation dump design
• system throughput
• UK planned to take over this effort for EDR/TDP
  phase
• except testing NC structure (done)
• remote handling design (on hold)

11
Electron cloud mitigation tests PEP-II chicane
Mitigation tests in ILC magnetic field
Aluminum surface
New 4-dipole chicane in the PEP-II LER
TiN surface much reduced signal with respect to Al
Observed new resonance Electron current peaks at
defined B values (n)
Test chamber Al and TiN-coated
12
RTML Design

• RDR effort included
• 2 stage bunch compressor overall layout optics
  design
• integration with central injector
• matching, diagnostics, collimation tuneup dump
  design
• Effort documented transfered to FNAL for TDP
  phase
• except completing ongoing dumpline design
• Further tuning simulations on hold until FY09

13
Marx Modulator Development

• Testing Prototype at 120 kV, 140 A, 3-5 Hz with
  Coarse Pulse Flattening.

27 kJ
27 kJ
140 A
140 A
120 kV
120 kV
14
Sheet Beam Klystron Development
Measure Beam From Gun
Measure Beam after Transport w/o RF
Winter 08
Measure RF Generation
Spring 09
15
Cavity Power Couplers and RF Processing Stand
Instrumented Coupler Test Stand at SLAC ESB
Processing of First Pair after a 150C Bake
Power (MW) -vs- Time for Pulse Widths of 50,100,
200, 400, 800, 1000 ms
16
Clean Room Being Constructed at SLAC
Storage Lockers
SLAC Modification to Orsay Design Eliminate
separate material pass-through More class 10
area Class 1000 gt 100 Remote vacuum bake
Office Space
Vacuum Oven possible upgrade
Gowning Area
Class 100
Class 10
Air Shower
Air Handling System
17
Worlds First High Precision Measurement of the
Magnet Center Stability of a SC Quad
Center Motion lt 2 microns with 20 Field Change
Close to ILC Requirement
18
IR Integration
BDS RDR design
grid 100m1m
Beam Switch Yard
Diagnostics
b-collimator
Sacrificial collimators
E-collimator
Final Focus
Tune-up emergency Extraction
14mr IR
Tune-up dump
Muon wall
Main dump
Extraction
19
BDS Strategy for TDP

• 2007 Plan called for detailed design
  engineering
• now postponed
• Current plan for TDP Phase I and II -gt
• 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
• Three primary topics
• General BDS design
• Test facilities, ATF2
• Interaction Region optimization

20
ATF2
Beamline, January 2008
May 2008
Summer 2007
Model of ILC final focus
HA PS
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
21
SLAC contributions to ATF2

• 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

22
High Availability Controls

• HA hardware will be crucial for ILC other
  future projects
• Key prototypes - Marx modulator, ATF2 Power
  supplies
• New ATCA standard - redundancy, auto-failover,
  hot swap

VME-ATCA Adapter
Modular 4 of 5 power supply with auto-failover
23
Systems Integration at SLAC

• Lattice Design
• Setup and led a global effort to produce an RDR
  based self consistent optical lattice from
  beginning to end.
• Problems identified and correction process
  begun. restart in FY09.
• Costs
• Working with Cost Management Group to better
  understand cost estimates and cost sensitivities
  to design variations. Ongoing gt FY09
• Staging Scenarios and Alternate System Designs or
  Layouts
• Studies on all accelerator systems. Many
  interesting cost reduction possibilities
  identified, gt10 reduction in underground
  facilities.
• Paced by limited engineering and technical
  resources (globally)
• Studies will continue through TDP Phase 1,
  for completion by 2010

24
Summary

• SLAC remains committed to a TeV-scale linear
  collider to complement the physics reach of LHC
• ILC is the only near-term option for 500 GeV
• Continuing RD is needed on other technologies,
  if LHC points to higher energy, or for later
  multi-TeV colliders.
• For the RDR, SLAC had a major role in the design
  of all area systems, cost optimization and
  costing, producing the RDR document
• For the TDP, SLAC leads e- source, BDS, RF
  sources, Linac design, System Integration
• and SLAC has an important role in e- cloud
  mitigation, HA hardware, simulations