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Cryogenic Cryogenic

Cryogenic - PowerPoint Presentation

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Cryogenic - PPT Presentation

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

valve cryogenic box linac cryogenic valve linac box system cryomodules distribution ess line lines thermal process helium shield vacuum

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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 ≤ 110-4

mbar

l/sec,

200 full thermal cycles, all materials and components must

tolerate the radiation dose of 510

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