ATF2 Status and American contribution

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ATF2 Status and American contribution

• Andrei Seryi
• KEK, March 25, 2006

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Brief status of ATF2

• ATF2 proposal Vol.1 (KEK Report 2005-2) and Vol.2
  (KEK-Report 2005-9)
• ATF international collaboration has been formed
• Production of Q-magnets in IHEP
• Production of Q-BPMs for main beamline and their
  electronics at PAL and SLAC
• Developments of IP-BPMs and electronics
• Upgrade of IP Beam Size (Shintake) Monitor
• Development of two prototypes of power supply
  system
• Status and hardware discussed and organization
  streamlined at ATF2 Project meeting, Feb 3-5,
  2006, at SLAC
• Development of most effective layout, removal of
  chicane, optimization of extraction optics

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Agenda ATF2 Project meeting, Feb 3-5, 2006
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ATF2
ILC-like FF

• ATF2 optics has ILC-like diagnostics and Final
  Focus
• FF and diag. optics are mostly fixed now, recent
  work focused on improving existing extraction
  layout

New diag. skew corr.
Existing extraction
Goals of ATF2
(A) Small beam size (with Shintake BSM at
IP) (A1) Obtain sy 35nm (A2) Maintain for
long time (B) Stabilization of beam center (with
IP-BPM) (B1) Down to lt 2nm by nano-BPM (B2)
Bunch-to-bunch feedback of ILC-like train
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Amplitude of ground motion
M.Masuzawa
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ATF2 layout

• Layout to be finalized in June. Presently study a
  possibility to make changes in existing
  extraction to send beamline parallel to the wall,
  to ease civil construction and radiation safety
  and also to reduce dispersion, to facilitate
  extraction of low emittance beam

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Assembly Hall
Optimization of existing extraction Version 2.4
minimal change of existing EXT. Optics solution
seems possible but matching is rather difficult
and dispersion is quite large preservation of
low emittance beam during extraction may be an
issue
such matrix needed for double kicker compensation
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• Optimization of existing extraction
• Goal optimize civil construction layout
  radiation safety make extraction optics
  symmetrical with min dispersion to facilitate
  extraction of small emittance
• Version 3.1 larger changes to existing EXT
• Optics solution has great symmetry
• Double kicker compensation will be preserved
• All existing magnets are used
• Dispersion is reduced four times, which
  facilitate preservation of low emittance beam
  during extraction
• Will finalize this optics and layout soon

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Contribution to ATF2 from America

• Participation in optics design
• Electronics for Q-BPMs
• Participation in design and measurements of
  Q-magnets (being made at IHEP)
• Movers for beamline magnets
• High availability power supplies (KEK and SLAC
  proposals to be evaluated soon)
• Quads for final doublet
• Sextupole octupole magnets, design, production
  maybe in IHEP
• Final focus bends
• Participation in commissioning and operation

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Core after all machining finished, in the IHEP
Machine Shop. Coil after potting, first quad.
Cherrill Spencer (SLAC) visiting IHEP
IHEP team, C.Spencer (SLAC)
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First ATF2 quad on measuring stand at IHEP.
Rotating coil set-up. One of the next quads
produced at IHEP.
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• Q-BPMS (PAL) and SLAC electronics tested at KEK

Electronics Second prototype to be complete
then testing at ATF during 2 weeks operation
then complete production of the full set.
(This test is done with KEK analog electronics)
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FFTB movers design Suggestion for Final Doublet
Quads

• FFTB movers to be dismantled in April and will be
  refurbished for ATF2
• Photo shows FFTB QC3 in SLAC FFTB beamline
  which is one of the candidates for Final Doublet
  quad

Mover
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Power supplies for ATF2

• ATF2 is the place where many concepts, systems,
  or instrumentation needed for ILC will be
  mastered
• It is suggested to build the power supplies for
  ATF2 with High Availability (HA)
• HA provided by built-in redundancy, e.g. with 3
  out of 4 power supply concept
• SLAC is building a prototype of HA PS, results to
  be reported at the end of April and then a
  decision on PS will be made
• HA PS in ATF2 will give useful experience for
  ILC, but we will make sure that it should not
  delay or affect the main goal of ATF2

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P.Bellomo
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Demonstration HA Power Supplies

• Build a power system with Ethernet control that
  will provide 150A in a 3 out 4 redundant module
  configuration. Demonstrate performance,
  redundancy and current sharing

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HA PS prototype status

• Operating and evaluating five parallel-connected
  power modules under closed loop control
• Operating to a combined 100A of load current
  while monitoring individual power module output
  current and output ripple voltage. Observed
  nicely balanced currents (within 1) in the
  power modules.
• Simulated a failure of one power module by
  disabling the PWM signal to one power module
  during five power module operation to 100A,.
  Observed a re-distribution of load current among
  the remaining four operating power modules. This
  indicates that the redundancy scheme is feasible.
• The demonstration system is on a correct
  technical path, it is on budget and it is on
  schedule
• Operate four power modules in a three-out-of-four
  redundant configuration connected to an inductive
  load to provide a combined output of 150A
• Test the PS into an environmentally-controlled
  temperature chamber

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Recovery time. Response of the current and
voltage when one of the modules is lost. The
top blue trace represents the current. The
current drops about 200mV x 15 A/V, which
represents less than a 3A drop (out of 150A).
The system recovers to the reference current in
about 140ms. The bottom, green trace represents
the voltage. The drop measured, was about 2.5V
and recovers in within 40ms.
Current stability. The above graph shows the
output current of the system running at 120A. By
taking the absolute deviation from the average of
each point over time and then averaging those
values, we get an rms deviation of 2.2 ppm in the
short term.
Briant Lam, Paul Bellomo
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Detailed schedule
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Total cost

• Total cost is sheared roughly equal among three
  regions (conventional facility construction is
  covered by KEK)
• This is close to ILC construction model

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Budget profile
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Expected FTE contribution

• This is rough estimation included in Volume2.
• Since then there may be more commitment from the
  labs and institutions

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Summary

• ATF2 is project important for ILC
• The project is international from the start, and
  is gaining more and more interest and support
• Its schedule is matched to TDR timescale, so that
  experience gained at ATF2 could be applied to ILC
  TDR
• It is important to keep the schedule, despite
  possible financial difficulties