Road Map for High Energy Physics The DESY View

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Road Map for High Energy PhysicsThe DESY View
The strategy for the DESY programme is based
on three elements Accelerators, particle
physics, research with photons
Upgrade Project PETRA SR
Current Projects HERA DORIS VUV-FEL
Planned Projects TESLA X-FEL TESLA Linear
Collider
Focus in this talk on particle physics aspects
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HERA II

• 2000-2002 substantial modifications of HERA
  HERA experiments
• Goal for HERA II
• H1 und ZEUS 1000 pb-1 (ep e-p) with polarised
  e/e- and improved detectors
• HERMES first measurements of transversal
  spin structure of proton and analysis of nucleon
  structure in terms of Skewed Parton
  Distributions
• HERA-B (until 2003) production b-Quarks in p-N,
• production of charmonium-states and their
  propagation in nuclear matter

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HERA II
Luminosity Goal 7 1031cm-1s-1 by - stronger
focussing - increase in beam current
(background!) Reached in 2003 (with reduced
bunches) 3 1031 (HERA I-nominal 1,5
1031) High background has created delay of 1
year Efficiency of operation Still needs
improvements

• e polarisation
• -gt 50 für H1/ZEUS/HERMES

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Status of HERA

• The background and operational issues of HERA
  have been largely solved
• However, the background is still a concern
• Shut down is finished
• start up with p,e in early August.
• luminosity run in 2003 October December
• the HERA experiments are in a good shape and
  eager for (more) data taking
• goal for integrated luminosity of 1 fb-1 until
  end of 2006 (scheduled end of HERA II) -gt
  challenging
• Recent proposal for a HERA III programme -gt

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Open Questions in QCD HERA III

• Measure the behavior of inclusive, diffractive
  and exclusive reactions in the region near Q21
  GeV2 to understand parton to hadron transition.
• Measure FL over widest possible kinematic range,
  as this is a crucial observable for testing our
  understanding of radiation processes in QCD.
• Measure exclusive processes (VM production,
  DVCS) over wide W range to precisely pin down
  energy dependence of cross section. Need
  t-dependence of cross sections to get 3-D map of
  proton.
• Measure forward jet cross sections over widest
  possible rapidity range, to study radiation
  processes over the full rapidity range from the
  proton to the scattered quark.
• AND, do it all with nuclei !

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PRC, ESC Recommendation

• measurements would provide a significant step in
  the understanding of the strong hadronic
  interactions.
• agrees that many of the proposed measurements
  cannot be done at other existing or foreseen
  facilities.
• present level of the theoretical understanding of
  QCD does not allow predictions of the proposed
  measurements at the level of the precision
  achievable by the experiments.
• The PRC/ESC rate the HERAIII program at lower
  priority compared to the Linear Collider
  programme.
• Given the other priorities of DESY and its
  resources, PRC and ESC do not recommend the
  continuation of HERA III

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Transformation of PETRA
Today PETRA is the injector for HERA e,
p. Transformation into a 3rd generation SR light
source reconstruct 1/8 of arc
German government has agreed to fund PETRA
III Transformation scheduled to start in 2007
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TESLA Linear Collider and X-ray Laser
X-FEL now a stand-alone facility

• Daresbury, 23 25 September 2002

TESLA LC and X-FEL are based on SC RF
technology The linac designs are essentially
identical
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The Scientific Case
Consensus document http//sbhep1.physics.sunysb.
edu/grannis/wwlc_report.html

• A world-wide consensus has formed for a baseline
  LC project in which positrons collide with
  electrons at energies up to 500 GeV, with
  luminosity above 1034 cm-2s-1.
• The energy should be upgradable to about 1 TeV.
• The LHC and LC will offer mutually supporting
  views of the new physics world at the TeV scale.
• OECD GSF Consultative Group on High-Energy
  PhysicsThere should be a significant period of
  concurrent running of the LHC and the LC,
  requiring the LC to start operating before 2015.

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The Status of SC Cavities
SC RF structures for accelerators were developed
in many countries To meet the challenge of
high gradients needed for high energy Linear
Colliders the TESLA collaboration has attracted
all the world expertise in SC, thus leading to
major progress
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The TESLA Collaboration

• The TESLA Collaboration
• - at present 51 Institutes in 12 countries and
  still growing

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International TRC
Results from International Technical Review (Feb.
2003)
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Progress on TESLA Technology
First high power test of an electro-polished
cavity Completely new final preparation sequence
(no etching after tank welding) very good result,
similar to vertical test Continuing the RD is
one of the top priorities
Due to the XFEL DESY and partners will focus in
the preparation of collider on linac related
issues (industrialisation, reliability, high
gradient programme)
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High Power Test of a complete EP nine-cell cavity
HERA plant
Calib.Measurement

• 1/8th of a TESLA cryomodule
• 5 Hz, 500 ms fill, 800 ms flat-top
• 33- gt35 MV/m
• with no interruption related to
  cavity-coupler-klystron for more than 600 hours
• No field emission

Power/kW
Eacc/MV/m
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TESLA Energy Strategy
Assuming that cavities will reach 35 MV/m

• TDR (March 2001)
• Base line design for 500 GeV, upgrade possibility
  outlined
• initially operate at an energy of about 500
  GeV, to explore the Higgs and related phenomena,
  and then
• increasing the energy to 800-1,000 GeV, to more
  fully explore the TeV energy scale.

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Experience with TTF

• Proof of principle and first FEL-experiments at
  TTF I

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VUV-FEL User Facility at TTF II
250 MeV 1 GeV

• RF commissioning in 2003, start of FEL
  operation in 2004

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Recommendations concerning TESLA
The German Science Council has issued in November
2002 its recommendations

• The Science Council requests the Federal
  Government to give its binding consent to German
  participation in the LC as soon as possible after
  the project proposal has been submitted with
  specific details concerning international funding
  and international cooperation.

The Science Council requests the Federal
Government to give its binding consent to German
participation in the TESLA X-FEL project as soon
as possible after the revised project proposal
has been submitted .
DESY submitted answers to these requests
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Government Decision
The decisions of the German Ministry for
Education and Research concerning TESLA was
published on 5 February 2003
DESY in Hamburg will receive the X-FEL as
European Project Germany is prepared to carry
half of the 673 MEuro investment cost.
Today no German site for the TESLA linear
collider will be put forward. This decision is
connected to plans to operate this project within
a world-wide collaboration DESY will continue its
research work on TESLA in the existing
international framework, to facilitate German
participation in a future global project
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Next Steps

• X-FEL
• Continuation of the RD work for the X-FEL
  accelerator
• Formation of a planning group with all interested
  partners (including future users)
• Analysis of the present concept for the linear
  accelerator, as described in the TDR supplement,
  and the laser facility by the planning group
• Adaptation of the project parameters to include
  the findings and recommendations of the planning
  group

• Linear Collider
• Continuation of the high gradient programme
  (construction, optimisation and tests of cavities
  with 35 MV/m)
• Build-up of a European LC Design Teams as part
  of an international Design Team
• Participation in the LC working groups of ICFA
  and ECFA

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Next Steps for the X-FEL

• Site and some of the technical parameters for
  XFEL Laboratory are currently reconsidered.
• Formation of European Working Groups under way.
• Aim for decision on construction in 2005!

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Consequences of the Decision for the Linear
Collider

• Given the decision of the German government the
  community will now take a path used for other
  international projects (e.g. ITER)
• unite first behind one project with all its
  aspects, including the technology choice, in 2004
  and then
• approach all possible governments in parallel
  in order to trigger the decision process,
  definition of structure of organisation and site
  selection
• Aim at approval of LC around 2006/2007
• The ILCSG agrees that it would be highly
  desirable to form a Core Group to begin the
  international design, based on accumulated work
  to date, but reexamined in a completely
  international context.

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Technology Decision
Aim at joint selection of one technology in 1
year.

• How
• Gather a committee of wise persons, who use
  criteria to be developed by the ILCSC, to
  recommend a technology choice to the ILCSC.
• The regional steering committees will each
  nominate 4 persons from which the ILCSC will
  choose three from each list for a total of 9 wise
  persons.
• First discussion of the make-up of the committee
  in August.
• Advice in this will be widely sought from the
  community.

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How to Realise Big Accelerator Projects?
Global Accelerator Network

• Collaboration of interested accelerator
  laboratories and institutes world-wide with the
  goal to build, operate and utilise large new
  accelerators
• Follows example of major detector collaboration
  in particle physics
• Partners contribute through components or
  subsystems
• Facility would be the common property of the
  participating countries, these would also share
  the responsibility and cost for operation.
• Project of limited duration (25 years)
• A new model of international cooperation

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Strategy for Particle Physics at DESY

• Present Programme
• HERA II, astroparticle physics (Amanda/Icecube),
  theory
• HERA will end 2006/2007
• For DESY the LC is the top priority after LHC,
  in accordance with the world wide agreed
  recommendations
• Discussion of strategy for research in particle
  physics at DESY in the time between HERA end and
  LC has started
• Strategy group has been set up in spring 2003
• (DESY and users, members of advisory committees)
• Similar groups exist at SLAC, FNAL, KEK