Title: JRA on Sc cavities and Cryomodule for a Pulsed proton Linac
1JRA on Sc cavities and Cryomodule for a Pulsed
proton Linac
R. Garoby for S. Chel, E. Ciappala, R. Duperrier,
F. Gerigk, R. Losito, V. Parma, B. Petersen, P.
Pierini, J. Tuckmantel, M. Vretenar, W.
Weingarten
- Motivation
- Work Packages
- Partners resources
2Motivation
- A superconducting linac represents today the best
solution for the acceleration of high intensity,
high brightness and high beam power proton beams
up to a few GeV Foreseen European projects
planning to use a superconducting linac for
accelerating protons EURISOL, ESS, ADS,
LPSPL/SPL at CERN. - Based on the results of the HIPPI JRA inside CARE
which has studied the low energy part of pulsed
proton linacs (up to 200 MeV) and using
extensively the technology developed for the ILC,
the proposal is to extend the development to the
acceleration system above 200 MeV for a pulsed
proton linac, using superconducting elliptic
multi-cell cavities. - One important goal is to prepare for a start of
construction of the LPSPL at CERN in 2012, as
part of the planned overall refurbishment of the
injector complex of LHC.
3WP1 Management Communication
Goals
- management of the JRA
- organization of communication inside and
dissemination outside the JRA (publications,
internet etc.) - link with other JRAs as well as with other
European projects and integration of the relevant
results - coordination of the technical debates and
conclusion on suitable technologies
Year 1 Year 1 Year 1 Year 1 Year 2 Year 2 Year 2 Year 2 Year 3 Year 3 Year 3 Year 3 Year 4 Year 4 Year 4 Year 4
Coord. meetings / workshops X X X X
Reports X X X X
4WP2 Studies computations
Subjects
- HOM in cavities
- analysis of the effect on the beam,
- study of the possible means of compensation,
- specification of solution (e.g. HOM dampers).
- Study of the propagation in the high energy
sections of the beam mismatch induced by
transient neutralization at low energy - simulation of the neutralization in the front-end
(steady state and transient), - simulation of the transport of this transverse
modulated beam pulse in the rest of the
accelerator, - analysis of possible corrective actions.
- Study of beam centering and matching in the high
energy sections using BPMs and/or dipolar modes
in the cavity - development of a centering correction method
using the dipolar moment, - development of a matching method using the
quadrupolar moment.
4
5WP2 Beam dynamics computations
Planning
Recommendations for the cavity design (WP3)
Year 1 Year 1 Year 1 Year 1 Year 2 Year 2 Year 2 Year 2 Year 3 Year 3 Year 3 Year 3 Year 4 Year 4 Year 4 Year 4
HOMs x x x x x x
Neutralization x x x x x x
Beam matching and alignment with BPMs x x x x
Recommendations for the design of the prototype
cryomodule (WP4)
5
6WP3 Superconducting cavities
- Goal
- development of superconducting elliptic
multi-cell cavities meeting the SPL
specifications for b1 (25 MV/m). The high power
tests will be made at the CEA-Saclay using
CRYHOLAB and the 704 MHz RF system installed in
the frame of HIPPI. - Design phase
- optimization of cavity shape,
- optimization of geometrical beta (usually the
optimum ßgeom lt ßparticle), - Hardware tests (Cryholab - Saclay)
- measurement of each cavity in a test cryostat (Q
as a function of temperature (2 K, 4.5 K) and
electric gradient) - measurements with a matched power source
(low-power) and high-power tests (up to 1 MW), - determination of the maximum gradient as a
function of repetition rate (duty cycle).
7WP3 Superconducting cavities
- Challenges
- high gradient at relatively low frequency,
- pulsed mode of operation at high repetition rate
(50 Hz)
Planning
Year 1 Year 1 Year 2 Year 2 Year 2 Year 2 Year 3 Year 3 Year 4 Year 4 Year 4
Cavities Design Construction of cav. 1 Construction of cav. 1 Test cav.1 Study improved design Study improved design Construction of cav.2 Test cav.2 Integ. in cryostat
Couplers Design Construction Construction Construction
8WP4 Multi-cavity cryostat
- Goals
- design of the complete multi-cavity cryostat for
the SPL , - construction of a prototype housing the 2
cavities built in WP2 and tuners equipped with
fast piezo devices as developed in the frame of
HIPPI, - characterization of the ensemble in the new
multi-purpose test place for sc modules at CERN
(JRA SuRFTeC).
9WP4 Multi-cavity cryostat
- Design phase
- design of the full 8-cell SPL cryo-module for the
SPL, adapting the TESLA/ILC cryo-modules to 704
MHz, - adaptation of the design of the cryo-module to
the construction of the prototype hosting 2
cavities, - assessment of the effect on the cavities of the
magnetic stray fields of the sc quadrupole
doublet, - stiffness simulations, vibrational analysis
- Hardware tests (CERN)
- pulsed high-power tests with up to 1 MW per
cavity Q, gradients - measurement of the static and dynamic cryogenic
losses, - test of the RF set-up, needed for the SPL 4 or 5
MW klystrons (prototypes from industry),
high-power circulators, splitters, phase
shifters, etc, - pulsed operation of multiple cavities driven by a
single RF source implementation and test of a 2
cavities version of the RF architecture
recommended after the study in the CNI for SLHC.
10WP4 Multi-cavity cryostat
- Challenges
- Minimization of heat loss and construction cost
- Control of mechanical vibrations
Planning
Year 1 Year 1 Year 1 Year 1 Year 2 Year 2 Year 2 Year 2 Year 3 Year 3 Year 3 Year 3 Year 4 Year 4 Year 4 Year 4
Design of long cryostat for 8 cavities X X X X X X X X
Construction of a cryostat prototype housing 2 cavities X X X X X X X X
Test of cryostat prototype X X X
11Partners and resources
WP1 WP2 WP3 WP4
CERN 24 m.m 0.06 MEuros 6 m.m 6 m.m 60 m.m 0.5 MEuros
CEA-Saclay 6 m.m 0.03 MEuros 18 m.m 69 m.m 0.5 MEuros 12 m.m
DESY ? 0.02 MEuros ? ? 4 m.m ?
IN2P3-Orsay ? 0.03 MEuros ? ? gt8 m.m
INFN-Milano INFN participation would make great sense (continuation of HIPPI etc.) and be highly valuable INFN participation would make great sense (continuation of HIPPI etc.) and be highly valuable INFN participation would make great sense (continuation of HIPPI etc.) and be highly valuable INFN participation would make great sense (continuation of HIPPI etc.) and be highly valuable
TOTAL gt24 m.m 0.16 MEuros gt24 m.m gt75 m.m 0.5 MEuros gt84 m.m 0.5 MEuros
gt207 m.m 1.16 MEuros