distribution system for the ESS linac Jaroslaw Fydrych TIARA Industry Workshop on Cryogenics GSI Darmstadt November 26 2014 Introduction to ESS Cryodistribution for the ESS linac Function and layouts ID: 535419
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Slide1
Cryogenic distribution systemfor the ESS linac
Jaroslaw Fydrych
TIARA Industry Workshop on Cryogenics @GSI
Darmstadt, November 26, 2014Slide2
Introduction to ESSCryodistribution
for the ESS linac Function and layouts RequirementsFlow scheme and P&IDs
Preliminary design of the valve boxes
Project execution planSummary
OutlineSlide3
European Spallation Source
As a project
ESS is
a
partnership
of 17 European
nations
committed
to the goal of collectively building and operating
the
world's leading facility for research by use of neutrons.
As
a scientific
facility
ESS will be an accelerator-driven neutron
source
for
investigations of the molecular building blocks of
matter.
ESS long pulse will be more powerful and brighter than existing neutron facilities. Slide4
European Spallation Source
ESS is under construction
in
Lund, in the southwest of Sweden.
Lund
DarmstadtSlide5
European Spallation Source
Klystron gallery
Cryoplant
buildings
Target
bulding
Instrument
halls
MAX IV
Science Village
ESSSlide6
ESS cryogenic system
Pure Helium
Gas Storage 1
20 m
3
LHe
Tank
Standalone Helium Purifier
Helium Recovery System
Pure Helium
Gas Storage 2
Accelerator
Cryoplant
T
est & Instrument Cryoplant
5 m
3
LHe
Tank
Target Moderator
Cryoplant
LHe
Mobile
Dewars
Test Stand
Cryodistribution
System
Instruments & Experiments
LN2 Storage Tanks
LN2 Mobile
Dewars
Accelerator
Cryodistribution
System
Cryomodules
Test Stand Lund 2
Target
Cryodistribution
System
Hydrogen Circulation Box
Hydrogen ModeratorSlide7
Linac cryogenic system
Cryogenic system of the ESS linear accelerator (linac) will be composed of a large scale cryoplant, cryogenic distribution system and 43 cryomodules. The cryomodules will consist of 120 elliptical and 26 spoke cavities, which will be cooled with saturated superfluid helium at 2 K.
The design contingency of the ESS accelerator includes up to 14 additional
cryomodules, which will require another cryogenic distribution line.
21 High Beta Cryomodules
9 Medium
Beta
Cryomodules
13 Spoke
Cryomodules
Linac
Cryoplant
Superconducting section of the
Optimus
linac (303 m
)
14 High Beta
Cryomodules
Design contingency (116 m)
Cryogenic distribution systemSlide8
Cryogenic Distribution Line (310
m) comprising 43 valve boxes Endbox
Cryogenic
Transfer
Line (75 m)
Splitting
box
Linac
CDS –
function and
layout
21 High Beta
Cryomodules
(174 m)
9 Medium
Beta
Cryomodules
(75 m)
13 Spoke
Cryomodules
(54 m)
Linac
Cryoplant
Superconducting section of the
Optimus
linac
(303 m)
Auxiliary process lines
Linac Cryogenic Distribution System
Layout
Cryogenic Distribution System for the ESS linear accelerator
is
intended for delivering
the
cooling power
from
the linac
cryoplant
to the
cryomodules
by
means of the constant flows of supercritical and cold gaseous
helium, at 4.5 K and 40 K, respectively. Slide9
Cryogenic Distribution Line (310
m) comprising 43 valve boxes Endbox
Cryogenic
Transfer
Line (75 m)
Splitting
box
Linac CDS
– function and layout
43 branch
cryolines
Auxiliary process lines
Cryogenic Distribution
Line
with valve boxes
Cryogenic
Transfer Line
Auxiliary
process lines
Layout
Isometric view
Linac Cryogenic Distribution SystemSlide10
General requirements
Main general requirements for the design and
construction
of the ESS
Cryogenic Distribution System
adequate to ensure smooth operation throughout the expected lifetime of 45
years,suitable for continuous operation (with limited scheduled interruptions only) to meet top
-level requirement of 95 % availability of the
linac itself,
ensure
no
deterioration of thermal
and
mechanical
properties
within
the operation lifetime,must allow for the separation of a single
cryomodule from the cryodistribution line, must allow for
the warm-ups and cool-downs of
a single cryomodule, while keeping the rest of the system at cryogenic temperatures, must comply with Swedish and European legislation concerning occupational health, safety and environmental protection,
as well as pressure and cryogenic equipment
regulation and standards (PED97/23/EC, SS-EN 13480, SS-EN 13458, etc.) Slide11
Technical requirements
Main technical requirements for the design
and
construction of the
ESS Cryogenic Distribution System
heat loads not higher than 420 W and 3.66 kW to the cold helium circuit and thermal shield, respectively,
supercritical helium temperature below 5.2 K in the interfaces to the cryomodules at nominal
operation conditions,
vacuum insulation below 10
-6
mbar
at nominal working condition
(below
5·10
-3 mbar
at ambient temperature with active vacuum pumping),integral helium leak rate below 1
10-7 mbar
l/sec from the helium circuit to the vacuum,
tightness of the valve seats ≤ 110-4
mbar
l/sec,
200 full thermal cycles, all materials and components must
tolerate the radiation dose of 510
5 Gy,Slide12
Linac CDS – general flow scheme
Two main cryogenic circuits: - thermal shield circuit (TS supply and TS return lines) - cold helium circuit (Helium supply and VLP lines)
Elliptical
cryomodules
Spoke
cryomodulesSlide13
Valve boxPIDs
The heat exchanger,
JT and filing valves are
in the
cryomodule
!
Valve box for the elliptical
cryomoduleSlide14
Valve box
PIDs
The heat exchanger,
JT and filing valves are
in the valve box!
Valve box
for the spoke cryomoduleSlide15
Linac
CDS isometric
Valve box
Jumper connection
Cryoline
Elliptical
cryomodules
Auxiliary process
linesSlide16
Linac
CDS isometric
Valve box
Cryoline
Jumper connection
Modular structure
of the cryogenic distribution line
Auxiliary process
linesSlide17
Linac CDS - position in the tunnel
Valve box
Transport area
Wave guides
Auxiliary process
lines
Cryomodule
Compressed air line
Cable
trays
Cooling water linesSlide18
Valve box conceptual designSlide19
Valve box – process lines, supports
and vacuum barrier
Valve box piping
S
liding supports
of main process lines
Fixed support
o
f main process lines
Vacuum
barrier
Side process lines
Interface to the
cryomodule
Cryogenic control valves
VLP line
He supply
line
Thermal shield supply line
Thermal shield return line
1
0 layers of MLI
on cold process linesSlide20
Valve box – thermal shields
Cryoline
thermal shield
Valve box
thermal shield
Shield sliding
supports
Bottom plate
(demountable)
Thermal shield
of
cryoline
interconnection
(demountable)
Thermal shield
at the
cryomodule
interface (demountable)
Jumper connection thermal shield
3
0 layers of MLI
on thermal shieldSlide21
Valve box – vacuum jacket
Cryoline
vacuum jacket (DN550)
Valve box
vacuum jacket
Cryolinesupport
Bottom plate
(demountable)
Cryoline
interconnection
sleeve w
ith axial compensator (DN600)
Interconnection
s
leeve at the interface to the
cryomodule
Jumper connection vacuum jacket
w
ith lateral compensators
(
vertical:
DN350
horizontal: DN450
)
Valve box
supportsSlide22
Project execution plan
Conceptual designs already finished Negotiations
and
agreementsin-kind contribution (optional European open tender process)
CDS for the spoke linac will be provided by the French in-kind partner CDS for the elliptical linac - negotiations are in progress Further phases
Detailed design: Q1-Q3 2015Production: Q4 2015 – Q2 2017 Installation: Q1-Q2 2017
Commissioning: Q3 2018Slide23
Summary
The ESS linac requires an extensive cryogenic distribution system. General
and technical requirements for the ESS
cryogenic distribution system are specified.
These requirements have strongly affected a vast number
of conceptual and detail design choices. Detailed 3D model of the valve box conceptual design was used for the feasibility study.
Thank you
for
your
attention