Transcript PROTON DRIVER: PROSPECTS IN EUROPE Introduction Plans in the UK

PROTON DRIVER:
PROSPECTS IN EUROPE
Introduction
 Plans in the UK
 CERN plans
 Other EU-supported linac-based driver studies
 Final words

R. Garoby
June 22, 2005
INTRODUCTION
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Large proton accelerators in Europe
for the next decade




UK is actively supporting accelerator studies and developments
aiming both at the upgrade of the ISIS facility and at a UK
neutrino factory.
Germany is launching the FAIR project of a multi-purpose large
scale facility at GSI.
Low energy (<1 GeV) and 100 % duty cycle linac-based proton
drivers are studied for the next generation ISOL-type RIB facility
in Europe (EURISOL) and for Accelerator driven systems (XADS).
Physics committees are investigating the domains where CERN
could be involved:
-
The SPSC (SPS and fixed target experiments Committee) had a
workshop in September 2004,
The INTC (ISOLDE and nToF experiments Committee) will meet in
October 2005.
The LHCC (LHC experiments Committee) and the SPC will also give
a message.
H+ + n + n
H+ + RIBs
+ pbars
H+ (<1GeV)
+ heavier ions
+ n + RIBs
H+ + RIBs
+ m + n
Accelerator developments at CERN are motivated by these
recommendations under the constraints of the available
resources…
 The European Union (FP6) is supporting joint efforts (e.g. CARE,
DIRAC, EURISOL…).
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PLANS IN THE UK
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UK Context (courtesy C. Prior) [1/4]
Neutrino factory-related accelerator activities
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UK Context (courtesy C. Prior) [2/4]
UK baseline scheme for a Neutrino factory
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UK Context (courtesy C. Prior) [3/4]
RAL proton driver design
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UK Context (courtesy C. Prior) [4/4]
RAL 180 MeV H- linac (F. Gerigk)
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On-going developments (C. Prior) [1/14]
RAL Front-End Test Stand
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On-going developments (C. Prior) [2/14]
FETS lay-out
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On-going developments (C. Prior) [3/14]
H- ion source (D. Faircloth – ISIS)
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On-going developments (C. Prior) [4/14]
LEBT (J.J. Back – Univ. of Warwick)
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On-going developments (C. Prior) [5/14]
ESS chopper scheme
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On-going developments (C. Prior) [6/14]
FETS chopping scheme
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On-going developments (C. Prior) [7/14]
FETS buncher cavities (F. Gerigk)
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On-going developments (C. Prior) [8/14]
Fast beam chopper (M. Clarke-Gayther)
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On-going developments (C. Prior) [9/14]
Tracking results (G. Bellodi)
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On-going developments (C. Prior) [10/14]
FETS diagnostics
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On-going developments (C. Prior) [11/14]
ISIS machine physics programme (G. Bellodi)
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On-going developments (C. Prior) [12/14]
E-cloud simulation codes
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On-going developments (C. Prior) [13/14]
ISIS experimental programmes
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On-going developments (C. Prior) [14/14]
Summary and plans
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CERN PLANS
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CERN “seven-point strategy” *
* R. Aymar’s talk to the Council – December 2004
CERN Context [1/6]
1.
2.
3.
4.
5.
6.
7.
R.G.
Completion of the LHC project on schedule.
Consolidation of existing infrastructure at CERN to guarantee
reliable operation of the LHC.
An examination of a possible future experimental programme apart
from the LHC.
A role for CERN in the growing coordination of research in Europe.
The construction of a linear accelerator injector at CERN to
provide more intense beams for the LHC.
An accelerated R&D effort towards CLIC, CERN’s novel new
accelerator technology, which could open the way to much higher
energies than are available today.
A comprehensive review of CERN’s long-term activity to be
available by 2010, when results from the LHC will have given a first
description of the particle physics landscape for years to come.
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Events in 2005
CERN Context [2/6]
 Publication of SPSC Villars’s report
 Request for special contributions to accelerate CTF/CLIC (first CERN
priority for accelerator R&D)
 Support in the negotiation for additional resources from non-member
states about Linac4 (India & China)
 Annoucement of a special INTC meeting (NuPAC – Geneva, Oct. 2005)
about the needs of ISOLDE and nToF for the next decade  new set
of recommendations
 Creation of two working groups (POFPA: “Physics Opportunities with
Future Proton Accelerators” and PAF: “Proton Accelerators of the
Future”) to analyze scenarios and contribute to the definition of a
baseline scheme for 2010
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SPSC (Villars) recommendations [p.63]
● Future neutrino facilities offer great promise for fundamental
CERN Context [3/6]
discoveries (such as CP violation) in neutrino physics, and a post-LHC
construction window may exist for a facility to be sited at CERN.
● CERN should arrange a budget and personnel to enhance its participation
in further developing the physics case and the technologies necessary for
the realization of such facilities. This would allow CERN to play a
significant role in such projects wherever they are sited.
● A high-power proton driver is a main building block of future projects,
and is therefore required.
● Alone, a direct superbeam from a 2.2 GeV SPL does not appear to be the
most attractive option for a future CERN neutrino experiment as it does
not produce a significant advance on T2K.
● We welcome the effort, partly funded by the EU, concerned with the
conceptual design of a β-beam. At the same time CERN should support the
European neutrino factory initiative in its conceptual design. ->
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PAF Mandate (1/2)
Mandate of an Inter-Departmental Working Group on
CERN Context [4/6]
Proton Accelerators for the Future (PAF)
In preparation for the strategic decisions foreseen to be taken in 2006 and 2010
concerning future facilities at CERN, and in parallel with the R&D on CLIC for a possible
Lepton Facility, an inter-departmental working group aiming at the definition of a baseline
scenario of the possible development and upgrade of the present Proton Accelerator Complex
is mandated below. The working group is composed of a convener, Roland Garoby, and about
seven members from different departments. The group reports to the DG; its findings will be
discussed in the Executive Board.
The study is a natural extension of the analysis already done by the High Intensity Proton
(HIP) Working Group which focused on intensity upgrade (CERN-AB-2004-022 OP/RF). Its
scope is widened to cover other parameters such as beam energy and the needs of all possible
users of CERN facilities. It is expected to make use of the EU supported initiatives, namely
the Networks HHH and BENE, the Joint Research Activity HIPPI and the Design Studies
EURISOL and DIRAC (FAIR project).
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PAF Mandate (2/2)
CERN Context [5/6]
Collect performance requests of the future users, taking into account the foreseen LHC
upgrade, the possible Fixed Target Physics programme (including future options for neutrino physics) as
recently discussed by the SPSC (Villars workshop) in the report CERN SPSC -2005-010 and the
Nuclear Physics programme which will be discussed by the INTC (outcome of the future workshop in
September 2005).
Analyse the various development and upgrade options of the overall CERN proton complex
including possible replacement of some of the present accelerators with Rapid Cycling Synchrotons
(RCS) and/or Fixed Field Alternating Gradient (FFAG) accelerators.
Identify technical bottlenecks and identify R&D that would be required to validate the various
options if necessary.
-
Identify synergies of R&D with non-CERN studies and projects.
Report to the DG results from the above studies before the end of 2005.
discussions in the Executive Board should be helpful to define a priority orientation.
Subsequent
Define a preferred scenario together with a suggested implementation schedule, staged in time,
and provide a preliminary estimate of the necessary resources (budget, man-power and expertise). A
first presentation is expected by mid 2006 as an input for the critical decisions by the management in
2006 on a possible LINAC4. The preferred scenario will initially be rather tentative and will ultimately
be formulated, around 2010, using the findings of this working group and taking into account the global
status of high-energy physics plans and projects.
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POFPA and PAF operating mode
CERN Context [6/6]
PHYSICS
PROPOSAL
S
LHC upgrade
(CARE-H3
& CARE-NED)
Linac developments
(CARE-HIPPI
& Linac study)
Neutrino
(CARE-BENE
& EURISOL-DS)
SPSC LHCC INTC
SPC
CERN
DIRECTION
CERN
COUNCIL
POFPA
->
PAF
RIB
(EURISOL-DS
& IUSG)
Accelerators upgrade
(HIP projects)
R.G.
•R.& D. requests
•Baseline scheme
•Staging
Study
Team(s)
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Proton Linacs developments: [ 1/12 ]
Contributors

SPL Study
B. Autin, E. Benedico Mora, A. Blondel, K. Bongardt (KFZ Juelich), O. Brunner, L. Bruno, F. Caspers,
E. Cennini, E. Chiaveri, S. Claudet, H. Frischholz, R. Garoby, F. Gerigk (RAL), K. Hanke, H. Haseroth,
C. Hill, I. Hoffman (GSI), J. Inigo-Golfin, M. Jimenez, M. Hori (Tokyo Univ.), D. Kuchler, M. Lindroos,
A. Lombardi, R. Losito, R. Nunes, M. Magistris, A. Millich, T. Otto, M. Pasini, M. Paoluzzi, J. Pedersen,
M. Poehler, H. Ravn, A. Rohlev, C. Rossi, R.D. Ryne (LANL), M. Sanmarti, E. Sargsyan, H. Schönauer,
M. Silari, T. Steiner, J. Tuckmantel, D. Valuch, H. Vinckle, A. Vital, M. Vretenar

IPHI-SPL COLLABORATION
CEA (DSM/DAPNIA @ Saclay) + CNRS (IN2P3 @ Orsay & Grenoble)

HIPPI JRA (inside CARE, supported by the European Union)
CEA (F), CERN (CH), Frankfurt University (D), GSI (D), INFN-Milano (I), IN2P3 (F), RAL (GB),
KFZ Juelich (D)

ISTC projects #2875, 2888 and 2889
BINP (Novosibirsk), IHEP (Protvino), IHEP (Moscow), VNIIEF (Sarov), VNIITF (Snezinsk)
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References [web-site]
Proton Linacs developments: [ 2/12 ]

Present characteristics
(Conceptual Design Report 1):



Update is planned (CDR 2):





are “optimized” for a neutrino
factory
assume the use of LEP cavities &
klystrons up to the highest energy
based on updated physics’
requests
using 704 MHz RF and bulk
Niobium cavities
in collaboration with CEA-Saclay &
INFN-Milano
to be published in 2005
Up-to-date information is
available:

on the CERN EDMS

on the SPL site: http://project-
spl.web.cern.ch/project-spl/
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SPL - CDR2 baseline
cryomodule
1m
1m
Proton Linacs developments: [ 3/12 ]
diagnostics,
steering
RF
• 704 MHz bulk Niobium cavities
• 3 families of cavities : beta =0.5,0.85,1.0
• gradients : 15, 18, 30 MV/m
• 5, 6 and 7 cells per cavity
10 to 15 m
quadrupole length to be determined, indicatively 300 mm (including bellows)
• Cold (2K) quadrupoles in the cryomodules, independently aligned from the cavities (to
minimize cold/warm transitions and maximize real estate gradient).
• Cryomodules of maximum length (between 10 and 15 m), containing n cavities and (n+1)
quadrupoles. Diagnostics, steering etc. between cryomodules.
• Length of the cavities limited by fabrication and handling considerations. Proposed
number of cells per cavity is therefore 5, 6 and 7 for the three sections.
• 2 MW max power /coupler
• Standardisation of the design after 2 GeV
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Proton Linacs developments: [ 4/12 ]
SPL - CDR2 parameters
Ion species
H-
Kinetic energy
3.5
GeV
40 (30 ?)
mA
Mean beam power
4
MW
Pulse repetition rate
50
Hz
0.57 (0.76 ?)
ms
352.2
MHz
Duty cycle during the pulse
62 (5/8)
%
rms transverse emittances
0.4
p mm mrad
Longitudinal rms emittance
0.3
p deg MeV
Mean current during the pulse
Pulse duration
Bunch frequency
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SPL
Main goals:
Proton Linacs developments: [ 5/12 ]
- increase the performance of the CERN high energy accelerators (PS, SPS & LHC)
- address the needs of future experiments with neutrinos and radio-active ion beams
95 keV
3 MeV
180 MeV
40MeV
-
~ 350 m
83 m
10 m
90MeV
RFQ chopp. DTL-CCDTL-SCL
RFQ1chop. RFQ2
H
Source
Front End
3.5 GeV
Normal Conducting
352 MHz
400 MeV 900 MeV
 0.65
 0.8
1
1
Superconducting
704 MHz
dump
Debunching
1 - 2 GeV to
EURISOL
LINAC 4
SPL CDR2 Preliminary Layout 15.3.2005
Work in progress!
Stretching and
collimation line
3.5 GeV to PS &
Accumulator Ring
(Neutrino Facility)
The present R&D programme concentrates on low-energy (Linac4) items,
wherever possible in collaboration with other laboratories.
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Linac4
New injector for the CERN booster synchrotron, to improve the beam delivered to the
LHC, ease operation, reach the ultimate luminosity, and increase the flux to ISOLDE.
Proton Linacs developments: [ 6/12 ]
95 keV
3 MeV
352 MHz
Hsource
LEBT
RFQ
40 MeV
->
Chopper
90 MeV
160 MeV
352 MHz
352 MHz
704 MHz
Alvarez DTL
or RFQ-DTL
Cavity Coupled
DTL
Side Coupled
Linac
Transfer line to PSB
Bridge
Coupler
SCL Cells
View of the assembled DTL
Beam
2.5
Quadrupole
Coupling Cells
IPHI
Numbers of ports :
- 6 for tuning plungers
- 6 for pick – ups
- 5 for post – couplers
- ? for RF – couplings
- ? vacuum system
ISTC #2875
CF – 100
CF – 100
CF – 63
CF - ?
CF - 250
ISTC
#2888
& 2889
HIPPI ->
ISTC #2875
Linac4 (~90m) will be located in an existing experimental hall and will extensively
re-use LEP RF equipment (klystrons etc.).
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IPHI-CERN collaboration
Proton Linacs developments: [ 7/12 ]
Partners: CEA (DSM/DAPNIA @ Saclay) + CNRS (IN2P3 @ Orsay & Grenoble)
Main goal: construction
of the 3 MeV – high
duty factor IPHI RFQ
to be delivered at the
end of 2007
Complete RFQ
(6 x 1m sections)
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Proton Linacs developments: [ 8/12 ]
IPHI-CERN collaboration
Cu vane (section 2)
ready for final machining
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ISTC project #2875
BINP (Novosibirsk) + VNIITF (Snezinsk)
Development of the technological basis for serial production of CCDTL structures in
the energy range of 40-100 MeV for the SPL project.
Feasibility study of effective application of normal conducting SCL structures up to the
energy of 150-180 MeV.
Proton Linacs developments: [ 9/12 ]






R.G.
Cost: k$ 550
Starting date: July 2004
Prototype of CCDTL structure to be delivered at CERN for high power testing by
mid-2006.
Technological model of SCL structure to be tested in 2006.
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ISTC project #2888
ITEP (Moscow) + VNIIEF (Sarov)
Development of the technological basis for construction of Alvarez-type structures
for the room-temperature part of the CERN SPL.
3500
2
5
1000
600
7
Alvarez tank
Proton Linacs developments: [ 10/12 ]

1




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6
3
Cost: k$ 460
Approval date: February 2005
Prototype of the first DTL tank (3-10 MeV) to be4 delivered at CERN for high power
testing by the end of 2006
One drift tube complete with Permanent Magnet Quadrupole (PMQ) included in DTL
prototype.
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ISTC project #2889
IHEP (Protvino) + VNIIEF (Sarov)
Proton Linacs developments: [ 11/12 ]

Design and manufacture of DTL-RFQ focusing and accelerating structure
prototype for a 3-40 MeV H- linac of the SPL project
Modular design (Sarov)
Cold model (Protvino)



R.G.
Cost: k$ 477
Approval date: February 2005
Prototype of RFQ-DTL structure to be delivered at CERN for high power by the end of
2006.
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Other contributions in negotiation
Proton Linacs developments: [ 12/12 ]

China (IHEP – Beijing) [->]






India (BARC-Bombay & CAT-Indore)





R.G.
1 x 352 MHz buncher
Linac4 quadrupoles (~ 55)
Linac4-PSB transfer line magnets (~ 25 quads + 8 dipoles)
Beam instrumentation ?
Joint study of H- source & H- injection in synchrotron ?
Pulsed power supplies for LEP klystrons
Manpower for commissioning the 3 MeV test place
Manpower for commissioning Linac4
Controls’ software ?
Visiting scientists
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Planning …
RF tests in SM 18 of prototype
structures* for Linac4
* Quotes from R. Aymar (Jan.2005)
3 MeV test
place ready
Linac4 approval *
“… in
2006-2007, to decide on the
implementation of the Linac 4 and
any increased R&D programme,
depending on new funds made
available and on a new HR policy”
R.G.
SPL approval *
CDR 2
“in
2009-2010, to review and redefine
the strategy for CERN activities in
the next decade 2011-2020 in the
light of the first results from LHC and
of progress and results from the
previous actions. “
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OTHER EU-SUPPORTED
LINAC-BASED
DRIVER STUDIES
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Nuclear Physics Applications
 Strong demand to establish in Europe a Radioactive Ion Beam (RIB)
laboratory, with intensities 3 orders of magnitude higher
than existing facilities, for nuclear physics and solid state
physics, biophysics, nuclear astrophysics, etc.
 2 parallel programmes: in-flight at GSI, ISOL in a new laboratory.
 Ideal driver:
- high-intensity 1-2 GeV proton linac
- operating in 2 modes: ~100 kW for ISOL target +
few MW beam power for fission products from spallation
- CW or pulsed at 50 Hz.
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The EURISOL Design Study
 Large collaboration present already in 5th FP of EU
 Design Study approved by the EU in the 6th FP
 CW, NC 5 MeV Front-end, 352 MHz SC Intermediate, 704 MHz SC
 Individual resonators for protons + low mass ions
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Neutron Production Applications
Superconducting linacs are the preferred sources of protons to
produce intense fluxes of neutrons for:
 basic science and condensed matter studies,
 driving subcritical reactors and “burn” nuclear waste and possibly
generate electricity (Accelerator Driven Systems)…
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European Spallation Source
2003: decision on construction delayed by 4-5 years.
Refinement of technological layout, with 2 new features:
Short pulse
50Hz
Unchopped long pulse
50/3Hz
1.5
1.0
PGe
I bea
 1120 MHz SC section from 400 MeV
 novel chopper/collector, required for the dual
operation mode (short and long pulse, 5 MW each)
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Vca
ms
0.3 0.48 0.1 0.48
0.3
2.0
0
10ms
22/06/2005
XADS
Accelerator group in the EU ADS Study has investigated the characteristics of
transmutation driver for 600 MeV, 6 mA, <5 trips/year.
Conclusions: CW SC linacs preferred to cyclotrons (reliability, upgradeability).
Reference layout: double front-end, SC from few MeV, CH structure.
Integrated Project EUROTRANS now submitted to EU, reliability + demonstrators. Seek
funding for construction in next FP (2008)
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FINAL WORDS
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
Studies are going-on for the two main types of proton drivers for
neutrinos (Linacs / synchrotrons). Linacs benefit from the support of
two other E.U. programmes due to multiple potential applications.

Work and resources are logically focused on the lowest energy, with
some duplication, although the EU-supported “HIPPI” Joint
Research Activity is improving the picture.

SC technology still has potential to improve, both in performance
and cost. It will benefit from ILC developments.

Selection of the optimum parameters of the proton beam depends
upon a global optimization including muon capture and front-end.

Host-site specificities will strongly influence the choice.
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THANK YOU !
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ANNEX
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<-
POFPA Mandate (1/3)
Mandate of a Working Group on
Physics Opportunities with Future Proton Accelerators (POFPA)
In preparation for the strategic decisions foreseen to be taken in 2006 and 2010
concerning future facilities at CERN, in liaison with the Inter-Departmental Working
Group on Proton Accelerators for the Future (PAF), and in parallel with the R&D and
physics studies on CLIC for a possible Lepton Facility, a working group aiming at the
definition of the physics opportunities that could be provided by the possible
development and upgrade of the present Proton Accelerator Complex is mandated
below. The working group is composed of a convener, and about seven other
members, most of whom will be drawn from the Physics Department, and will be
accompanied by experts from other Departments and representatives of interested
communities of scientific users. The group may create working teams on specific
physics topics, in cases where existing studies need to be supplemented. The group
reports to the DG; its findings will be discussed in the Executive Board.
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<-
POFPA Mandate (2/3)
The study will be based on the Fixed Target Physics programme recommended
recently by the SPSC at its Villars workshop (CERN SPSC -2005-010), and is
a natural extension of the previous analyses of physics opportunities with an upgrade
of the LHC luminosity (hep-ph/0204087, published in Eur. Phys. J. C39, 293,2005)
and of opportunities in neutrino, muon and kaon physics with a high-intensity proton
driver made by the ECFA/CERN Study Group (CERN-2004-002, ECFA/04/230). Its
scope is widened to include also opportunities in nuclear physics, based on the
programme that will be recommended by the INTC at its future ‘Villars’ workshop in
September 2005, in consultation with the EURISOL community. Close liaison with the
PAF Working Group will be assured by the conveners of PAF and POFPA, who will
nominate one member of each Working Group to attend the meetings of the other
Working Group.
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<-
POFPA Mandate (3/3)
Assess the likely physics objectives of LHC upgrades and non-collider
experiments from 2010 onwards, taking into account the likely objectives of other
physics laboratories.

Analyse the capabilities of the various development and upgrade options of
the overall CERN proton complex discussed by PAF to address these physics
objectives, for each option and physics programme separately.

Identify any detector R&D that would be needed if these experimental
objectives are to be realized.

Identify synergies of R&D with other CERN studies and projects, as well as with
activities outside CERN.

Report to the DG preliminary results from the above studies before the end of
2005. Subsequent discussions in the Executive Board should be helpful to define a
priority orientation.

Define a preferred scenario together with a suggested implementation schedule,
staged in time, and provide a preliminary estimate of the necessary resources (budget,
man-power and expertise) needed to carry out the corresponding experiments. A
further presentation is expected by mid 2006 as an input for the critical decisions by
the management in 2006 on a possible LINAC4. The preferred scenario will initially be
rather tentative and will ultimately be formulated, around 2010, using the findings of
this working group and taking into account the global status of high-energy physics
plans and projects.

R.G.
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<- 3 MeV test place
In construction. To be operational in 2007.
(RFQ from France,3 MeV chopping line from CERN).
Chopper structure
H- ECR ion source
IPHI RFQ
Bunching cavities
HV pulsed power supplies
for the LEP klystrons
The 3 MeV test stand
will become the frontend of Linac4 and SPL
R.G.
Beam Shape
and
Halo Monitor
H- beam
HV switch unit
Pulser
Computer
Water cooler x2 channels
X-axis translator
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inside
<-
•
Main Objectives
Research and Development of the technology for high intensity pulsed proton linear
accelerators up to an energy of 200 MeV. Aimed at the improvement of existing facilities
(E.U. request) at GSI, RAL and CERN.
•
Means
Coordinated efforts of 9 laboratories [RAL, CEA(Saclay), CERN, FZJ, GSI, Frankfurt
University, INFN-Milano, IPN(Orsay), LPSC(Grenoble)] investing
11.1 MEuro + 3.6 MEuro (E.U.) over 5 years (2004 – 2008)
•
History & Status
–
–
–
–
Autumn 2002: creation of ESGARD and recommendation to propose to the E.U. an
Integrated Activity about R. & D. for accelerators in the frame of the F.P. 6
Winter 2002/2003: preparation of a proposal
April 2003: HIPPI proposal submitted to the E.U., as a J.R.A. inside the CARE I.A.
August 2003: publication of E.U.’s reviewers conclusion
approval of HIPPI at 90 % of the financial request
–
–
–
November 2003: reformulation of CARE to adapt to the allocated budget and comply
with detailed (and fluctuating !) E.U. requirements
19 till 21, November 2003: public announcement & finalization of the planning and work
organization (CARE kick off meeting)
January 2004: official start
inside
<-
CARE
Central Management
Steering Committee
JRA4: HIPPI
Advisory Scientific
International
Committee
Work Package
Level
JRA4: HIPPI
Coordinator : R. Garoby
Deputy : M Vretenar
WP1: M&C
Leader: R. Garoby
Steering
Committee
meetings
Reviewing
and Reporting
Task/Topic
Level
Dissemination
WP2: NC
Leader: J.M. De Conto
WP3: SC
Leader: S. Chel
WP4: CHOP
Leader: A. Lombardi
WP5: BD
Leader: I. Hofmann
Drift Tube
Linac
Elliptical
Cavity
Chopper
structure A
Code
development
H-mode Drift
Tube linac
Spoke Cavity
Chopper Line
Code benchmark.
Side coupled
Linac
CH resonator
Chopper
Structure B
Simulation and
exp. at UNILAC
Cell coupled
Drift tube linac
Comparative
assessment of
SC structures
Comparative
assessment of
chopper designs
Simulation and
exp. at CERN
Comparative
assessment of
NC structures
Diagnostics and
collimation
Comparative
assessment of
codes
inside
<-
WP2: Normal Conducting Accelerating Structures
• Development of cold models and some
prototypes of NC RF structures for acceleration
up to an energy of ~ 100CCDTL
MeV,
[CEA, LPSC,CERN]
DTL Alvarez
• [CEA,
Prepare
comparative assessment with respect
LPSC,CERN]
to SC solutions
SCL Cells
SCL
[LPSC,CERN]
Bridge
Coupler
Beam
2.5
CH
[IAP-FU]
Quadrupole
Coupling Cells
Objective: comparative assessment in terms of shunt impedance
(goal : ZT2 > 40 MW/m) and cost, in the energy range 3-100 MeV
<-
inside
WP3: Superconducting Accelerating Structures
• Characterization of SC RF structures for use in
a pulsed linac.
• Investigation of different type of structures;
Multi-cell elliptical (medium/high beta)
prepare for comparative assessment
Spoke (low beta)
[CEA, INFN]
[FZJ, Orsay]
CH (low/medium
• Realization of a high
powerbeta)
704 MHz RF test
[IAP-FU]
place with cryogenic infrastructure
Objectives: gradient > 7 MV/m with Q > 1010 in the energy range 100-200 MeV, at
a construction cost comparable to normal-conducting structures; development
of efficient superconducting structures down to beam energies around 5 MeV;
availability of a 704 MHz high power RF test place for SC cavities.
<-
inside
WP4: Beam chopping
• Design chopping line, including choppers,
driver sand dump.
Broad band kickers
• Build
and
testkickers
prototypes (with beam in [CERN]
the
Separate
fast/slow
[RAL]
case of CERN).
• Compare solutions
Objectives: switching time smaller than the distance between bunches at
352 MHz (about 2 ns); chopper-line design minimizing emittance growth.
<-
inside
•
Successful first 18 months of operation.
•
Technical work progressing ~ as planned.
•
Communication:
– 5 Web-sites: e.g.HIPPI at: http://mgt-hippi.web.cern.ch/mgt-hippi/
HIPPI’04 at: http://hippi04.web.cern.ch/hippi04/index.htm
– > 20 publications .
•
Busy agenda with a workshop for each work package + HIPPI’04 (Frankfurt –
October 2004) + Visible participation in international events (EPAC’04,
LINAC’04, multi-MW workshop).
•
Tedious efforts to comply with Brussels administrative procedure.
Cumbersome preparation of the first yearly report…
<-
HIP WG: long term alternatives
INTEREST FOR
Present
accelerator
Replacement
accelerator
Linac2
Linac4
PSB
PS
SPS
LHC
upgrade
n physics beyond
CNGS
RIB beyond
ISOLDE
Physics with k
and m
50 160 MeV
H+ H-
+
0 (if alone)
0 (if alone)
0 (if alone)
2.2 GeV RCS* for
HEP
1.4  2.2 GeV
10  250 kW
+
0 (if alone)
+
0 (if alone)
2.2 GeV/mMW
RCS*
1.4  2.2 GeV
0.01  4 MW
+
(super-beam, -beam
?, n factory)
2.2 GeV/50 Hz
SPL*
1.4  2.2 GeV
0.01  4 MW
+
SC PS*/** for
HEP
26  50 GeV
Intensity x 2
++
5 Hz RCS*/**
26  50 GeV
0.1  4 MW
++
1 TeV SC SPS*/**
0.45  1 TeV
Intensity x 2
+++
Improvement
* with brightness x2
R.G.
++
+
(too short beam
pulse)
0 (if alone)
(super-beam, beam, n factory)
+++
0 (if alone)
0 (if alone)
0
+
++
0
+++
0
+++
+++
** need new injector(s)
63
(n factory)
?
22/06/2005
<-
Possible subjects of collaboration with China (1)
352 MHz buncher
Beam Kinetic Energy 3
RF Frequency
352.2
Chamber diameter 30.
Length
176
Inner cavity diameter 490
Q value (computed) 23613
Transit time factor
0.581
Shunt impedance
3.91
R/Q
27.88
Nominal voltage
140
Peak dissipation
16.0
Duty cycle
14 %
Average dissipation 2.3
Peak electric field
25.4
R.G.
MeV
MHz
mm
mm
mm
MW
W
KV
KW
KW
MV/m
64
22/06/2005
<-
Possible subjects of collaboration with China (2)
Quadrupole magnets for Linac4
Outer
Diameter
(mm)
Aperture
Diameter
（mm）
Effective
Length
（mm）
240
32
100
Max Mechanical
Length
（mm）
Gmax
（T/m）
200
12-15
Duty
Factor
14%
Total number of quadrupoles for the CCDTL section:
~ 30.
Additional quadrupoles for the SCL section (same lengths but slightly lower
maximum diameter and gradient of about 20 T/m):
~ 25
Quadrupole magnets for the transfer line Linac4 - PSB
Aperture
Diameter
（mm）
Effective
Length
（mm）
35
150
Max Mechanical
Length
（mm）
Gmax
（T/m）
300
5
Total number of quadrupoles for the transfer line:
R.G.
65
Duty
Factor
1%
~ 25.
22/06/2005