R. Garoby for the SPL

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SPL development status

• OUTLINE
• 1. Introduction
• 2. Up-to-date characteristics
• 3. On-going work
• 4. Planning and needs

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SPL Working Group
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1. Introduction
CERN baseline scenario for a Neutrino Factory
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Other applications of the proton driver

• Approved physics experiments
• CERN Neutrinos to Gran Sasso (CNGS) increased
  flux ( 2)
• Anti-proton Decelerator increased flux
• Neutrons Time Of Flight (TOF) experiments
  increased flux
• ISOLDE increased flux, higher duty factor,
  multiple energies...
• LHC faster filling time, increased operational
  margin...
• Future potential users
• Conventional neutrino beam from the SPL
  super-beam
• Second generation ISOLDE facility (EURISOL
  -like)
• ???

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2. Up-to-date SPL characteristics
H- source, 25 mA 14 duty cycle
CCDTL
new SC cavities b0.52,0.7,0.8
Fast chopper (2 ns transition time)

• RF system
• freq. 352 MHz
• ampli. tetrodes and LEP klystrons

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Improvements w.r.t. the reference design

• Improved transitions between sections ? better
  beam stability
• Doubled period length above 1.1 GeV ? save 25
  doublets, 8m, 3 MCHF
• Improved error studies ? 100 beam radius lt 20
  mm, even for large error case (30 ) ? quad.
  radius reduced from 100 mm to 60 mm, (17rms) ?
  save 2 - 3 MCHF
• Reduced longitudinal emittance 0.6 ? 0.3 ?ºMeV
  ? improved design of the transfer line (drift
  length 230 ? 175 m, bunch length 180 ? 130 ps)
• Use of beta0.8 cavities up to the highest energy
  ? shorter tunnel (- 100 m), less cavities per
  klystron, better control of mechanical resonances

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Revised SPL beam specifications
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Accumulator-Compressor scheme for a Neutrino
Factory
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Proton beam characteristics influence on the
rest of the complex
p production
Cycling rate of all the facility
m burst length
Distance between m bunches
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SPL sequencing and beam delivery
Fast deflection kickers
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3. On-going work
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Study of RT structures for the SPL front-end
bl
Alvarez Drift Tube Linac unsurpassable lt20
MeV good but expensive for 20-120 MeV
bl
Cell Coupled Drift Tube Linac attractive solution
for 20-150 MeV (a cold model is being designed)
bl/2
Coupled-Cell Cavity (LEP1) better efficiency
gt110 MeV
quadrupole
quadrupole
The final choice will depend on preferred
apertures, RT final energy, etc.
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Intensity increase programme possible location
of the SPL front-end in the PS South Hall
Þ 1.8 the flux to CNGS (provided upgrades are
made to PSB, PS SPS) Þ cheap installation,
giving benefits from SPL related hardware before
the full machine is operational shortening the
final setting-up
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4. Final comments

• Planning (guesses ...) and consequences
• 2009 SPL commissioning with beam
• 2005 Start of construction (civil engineering,
  preparation and test of SC cavities in SM18,
  etc.)
• beginning of 2004 land acquisition and
  authorisation of construction
• end 2003 decision
• Þ detailed design report for 2004
• Þ increase the design effort at CERN in
  interested laboratories by an order of magnitude
  before 2004 !