ATF2 Commissioning Page: 1 of 5
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A. Seryi# (SLAC), G. Christian (ATOMKI, Debrecen), B. Parker (BNL), D. Schulte, J.-P. Delahaye,
R. Tomas, F. Zimmermann (CERN), A. Wolski (Cockcroft Inst.), E. Elsen (DESY), T. Sanuki
(Tohoku Univ.), E. Gianfelice-Wendt, M. Ross, M. Wendt (Fermilab), T. Takahashi (Hiroshima
Univ.), S. Bai, J. Gao (IHEP Beijing), B. Bolzon, N. Geffroy, A. Jeremie (IN2P3-LAPP), R.
Apsimon, P. Burrows, B. Constance, C. Perry, J. Resta-Lopez, C. Swinson (JAI, Oxford), S. Araki,
A. Aryshev, H. Hayano, Y. Honda, K. Kubo, T. Kume, S. Kuroda, M. Masuzawa, T. Naito, T.
Okugi, R. Sugahara, T. Tauchi, N. Terunuma, J. Urakawa, K. Yokoya (KEK), Y. Iwashita, T.
Sugimoto (Kyoto ICR), A.-Y. Heo, E.-S. Kim, H.-S. Kim (Kyungpook Nat. Univ.), P. Bambade, Y.
Renier, C. Rimbault (LAL, Orsay), J.Y.Huang, S.H.Kim, Y.J.Park, W.H.Hwang (PAL, Korea), G.
Blair, S. Boogert, P. Karataev, S. Molloy, (Royal Holloway, Univ. of London), J. Amann, P.
Bellomo, B. Lam, D. McCormick, J. Nelson, E. Paterson, M. Pivi, T. Raubenheimer, C. Spencer,
M.-H. Wang, G. White, W. Wittmer, M. Woodley, Y. Yan, F. Zhou (SLAC), D. Angal-Kalinin, J.
Jones (STFC, Daresbury), A. Lyapin (UCL, London), A. Scarfe (Univ. of Manchester), Y. Kamiya,
S. Komamiya, M. Oroku, T. Suehara, T. Yamanaka (Univ. of Tokyo).
ATF2 is a final-focus test beam line that aims to focus
the low-emittance beam from the ATF damping ring to a
beam size of about 37 nm, and at the same time to
demonstrate nm beam stability, using numerous advanced
beam diagnostics and feedback tools. The construction
has been finished at the end of 2008 and the beam
commissioning of ATF2 has started in December of 2008.
ATF2 is constructed and commissioned by ATF
international collaborations with strong US, Asian and
An important technical challenge of ILC  is the
collision of extremely small beams of a few nanometers
in size. This challenge has three distinct issues: creating
small emittance beams, preserving the emittance during
acceleration and transport, focusing the beams to
nanometers and colliding them. Accelerator Test Facility
(ATF) at KEK  was built to create small emittance
beams, and has succeeded in obtaining an emittance that
almost satisfies the ILC requirements. The ATF2 facility
, which uses the beam extracted from ATF damping
ring, was constructed to address two major challenges of
ILC: focusing the beams to nanometer scale using an
ILC-like final focus and providing nanometer stability.
The two ATF2 goals, first one being achievement of
37nm beam size, and second being achievement of
nanometer scale beam stability at IP, will be addressed
sequentially, in 2010, and in 2012, correspondingly.
Achievement of the first goal will require development
of the methods to implement and verify the design optics,
requiring development of tuning methods to cancel lower
order correlations and higher order unwanted aberrations
in the beam. The ATF2 beamline, in addition to the final
focus, includes a diagnostics section for measurements
and correction of the beam at the entrance to the final
focus. ATF2 being a single beam line, achievement of the
first goal will also require use of an interferometer-based
beam size monitor (BSM, also called Shintake monitor).
To measure the beam orbit and maintain the beam size
with feedback, the beamline magnets are equipped with
sub-micron resolution cavity-BPMs and are placed on
movers. Tuning methods will be established based on
BSMs as well as BPM measurements.
Table 1: Comparison of ATF2 and ILC parameters
Parameters ATF2 ILC
Beam Energy, GeV 1.3 250
L*, m 1 3.5-4.2
7e,/y, m*rad 3E-6 / 3E-8 1E-5 / 4E-8
IP pfXy, mm 4 /0.1 21 /0.4
IP T', rad 0.14 0.094
E -0.1 -0.1
Chromaticity -1E4 -1E4
nbunches 1-3 (goal A) -3000
bunches 3-30 (goal B) -3000
Nbunch 1-2E10 2E10
EP 6y, nm 37 5
To this moment, ATF2 construction has been completed
and beam commissioning began in December 2008,
focusing on the first goal. In parallel, studies and
hardware development toward the second goal are
ongoing. These include characterization of the site and
beamline stability, development of nano-BPM to be
installed at IP, FONT (Feedback On Nanosecond
Timescale), an interferometer to monitor the position of
FD with respect to IP, and nanosecond rise-time kickers.
ATF2 is a model for a future ILC collaboration,
constructed by in-kind contributions, and commissioned
and operated by an international team of researchers from
Work supported in part by US Department of Energy contract DE-AC02-76SF00515
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Seryi, A.; Christian, G.; Parker, B.; Schulte, D.; Delahaye, J. -P.; Tomas, R. et al. ATF2 Commissioning, article, October 30, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc929610/m1/1/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.