Annex 4 - Contracting documentation

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Page
1

Annex
4

-

Contracting documentation


Technic
al

specifi
cation
3

Cryogenic systems for ELI
-
Beamlines and HiLASE facilities: design, assembl
y

and testing of
cooling loops for repetition
rate
lasers


The
objective

of the
ELI
-
Beamlines
a
nd

HiLASE
p
rojects is to build
new
facilities

that will be
employ
ing

cutting
-
edge

laser
technolog
y for
fundamental

research and
for
technology applications
.

D
iode
-
pumped
multi
slab

laser amplifiers

able to
deliver pulses with

energy
100 to 500 J

in a single
beam

represent o
ne of the key technologies planned for these centers
.
T
hese
laser
s will
typically
use
Yb:YAG
as
an
active
medium

and will be cryogenically cooled,
with
characteristic
operating
temperature
of

1
60

K
.
This document describes the technical requirements for
the
design,
assembling and performance evaluation of the cryogenic loops for ELI
-
Beamlines

and HiLASE
laser
amplifiers.

The subject of this procurement
are expert services involving
design, assembly, t
esting,

operation
optimization, and commissioning of the
cryogenic
cooling loop of a
diode
-
pumped
multislab
laser
amplifier

able to deliver pulses with energy
100 to 500 J,

and
associated
expert consultancy. The
subject of the service
required
is not
delivery of hardware of the cooling

loop.



1.

Required Deliverables

D1

Design of a c
ryogen
ic measur
ement

station for complex characterization of
optic
al
materials


The Contractor shall
develop

for the Client a design of a

cryogenic measur
ement
station for
the
characterization of
properties of
optical materials at temperatures
within the
range

of
100
to

180

K.
The station shall make it possible to measure
thin
samples of crystals, ceramics
,
glass and polymers in
sizes

of
up to

25x25

mm.
The station shall make it possible, at temperatures ranging from
at least
100
to
at least
180

K,
to accurate
ly

measure the following parameters
:

-

Refractive
index
within
wavelengths

range of
900
-
1100 nm

-

O
ptic
al quality
(
2D
map

of
optic
al
homogen
e
ity
of the
sample in the selected direction
)

-

Amplification of the
l
aser

sign
a
l

in the selected direction

-

Thermal diffusivity

-

Thermal conductivity

-

Coefficient of t
hermal expan
sion

The design shall include,
in addition to the

engineering
documentation
and drawing
s
, also
the

methodolog
ical

proposal for measuring thermo
-
mechanic
al

properties of crystals, ceramics, glass and
polymers
.


D2

Measur
ements

of material properties at low temperatures according to the Client’s
requirements

The Contractor

shall carry out measurement of material properties at low temperatures
(
ranging
from
100
to
180

K)
according to
the
specific requirements of the Client as may be formulated in
writing
,

in the extent of approximately
15
samples
.
Measurements of c
rystal and ceramics samples

Page
2

(
and possibly also glass and polymers
)
with sizes of
50
x
5x5

mm
will be required
a
s well as
the
measurement
of the following parameters
:

-

Specific heat capacity
(J kg
-
1
K
-
1
)

-

Thermal conductivity
(W m
-
1

K
-
1
)

-

Coefficient of t
hermal
expan
sion

(K
-
1
)

These measurements may
potentially
be required during the entire

duration of the contract
.


D3

Expert consulting in the field of
propagation of laser beams in the laser amplifier
medium

The Contractor

shall provide the Client with expert consulting in the field of propagation of laser
beams in the
medium of multi
-
slab
laser amplifier
s
.
The content of this consulting shall focus on the
dependence of the
beam
wavefront

on the thermal balance
/
heat
distribution in the amplifier,
on
the design of

measurement and diagnostics
equipment
for
the
characterization of
the
laser beam
parameters
,

and
on the
proposal for system integration of the cryogenic
laser

amplifiers into the
ELI
-
Beamlines

and HiLASE faci
lities
.

The expert consulting
,
which is subject to this part of performance
,
shall be required over the period
of
24
months,
starting
on the date of contract
signature
, and in the maximum extent of
1

500
hours
.

D4

Conceptual design of the c
ryogen
ic cooling loop for
a
100
-
J
laser system

The Contractor

shall
produce
a conceptual design of the cryogenic cooling loop for
100
-
J
laser system
providing 100

J of energy
at

the output and consisting of one or two multi
-
slab
Yb:YAG
amplifier
heads
.
The
designed syst
em has to utilize an active He gas

loop

with
nomin
al temperature of
1
6
0

K

(
the
o
peration

temperature needs to be adjustable between
100
and
180 K)

for
removal

of
dis
s
ip
ated energy
of at least

4 kW
.
The system has to ensure
a
thermal stability of
He
within

+/
-
3

K

or
better
, at the anticipated
gas flow

of
20
to
40

m
s
-
1

a
nd shall use liquid nitrogen as
the
primary
coolant
.

The designed cooling loop has to enable
removal
of
the
total dissipated thermal energy
(
5

kW
)

from one head

(100

J)

or
from two heads

(50
-
J class)
.

The Client will specify to the Contractor
the choice of system configuration (one
100

J
head or two 50
-
J class

heads
).

The result of
D4

shall be a technical report including
the
description of the main components of

the
cooling loop
,
the
results of numerical simulation
s

of He circulation in the proposed loop
,
the
recommendations as to thermo
-
mechanical properties of materials used to build
components of the
loop
,
the
design
ed

technical parameters of
the
individual
loop components
,

as well as
the
proposed
procedure
for bringing the cooling loop into operation
.


D5

Detailed technical design of a cooling loop for
a
1
00
-
500 J

laser system amplifier

The Contractor

shall
produce
for the Client a d
etailed technical design of a cooling loop for laser
system amplifier consisting of one or two
Yb:YAG

multi
slab amplifier heads
generating

pulses with
the output
energy ranging from
1
00

to
500

J.
The cooling loop
has to enable
removal
of total
dissipated
heat

of
at least
18 kW
.
It is
assumed

that in the case of a system consisting of two
amplifier heads

the
ratio of
dissipated
heat

in

these heads will be
1:1.

The proposed system has to use an active gaseous
He

loop

with nominal temperature of
1
6
0

K

(
operating temperature needs to be adjustable between 100 and 180 K
) a
nd shall ensure
thermal stability of He
of

+/
-
3

K

or better
, at
expected flow velocity

of 20 to 40

ms
-
1
.
It is required
that the basis for the
design

of this cooling loop for
a
system
generating

pulses with output energy
between
1
00
and
500

J

is

an
extrapola
tion of the
design of the
100
-
J

laser cooling loop
developed

Page
3

above under
D4.

Performance required
within this
D
eliverable
shall include the following activities
:

i.

Establishing

the main components of the
cooling loop of the laser system amplifiers
,
carrying out
detailed numerical simulations of the convection cooling regime for
a
nominal configuration of
1
0
0
-
500

J system laser heads
,
carrying out

detailed numerical simulations of the circulation of
cryogenic coolant in
a

closed

loop

of

1
0
0
-
500

J amplifier
s
;

ii.

Description

of
arrangement

and
definition of
necessary technical parameters for the testing
(
mockup
, i.e. potentially
using

a dummy gain m
edium

and
/
o
r
a
substitute source of thermal
energy)
head for the 1
0
0
-
500

J system
;

iii.

D
etermination

of technical requirements and benchmark criteria for all systems and components
of the cooling loop, elaboration of detailed technical specifications for
these components
,
producing

detailed and complete
technical documentation for
assembling

the cooling loop for
a

1
00

500

J amplifier
;

iv.

Description
of diagnostic elements for measurement of
the turbulent flow
parameters
in the
closed
loop

and in t
he amplifier head of
a

1
00
-
500

J laser system
.

Before
starting
the
work

defined above under
ii)
, the
Client
shall
provide

the
Contractor
with
information
o
n the

selected configuration of
the laser heads and their thermal
budget
.
This
information will be provided no later than within
6
month
s

after

signature of the Contract for work
.

Each activity described above in D5 shall result in a detailed technical report
.


D6

R
epresentation of the Client during the
receipt
of the cooling
loop

components for the
1
00
-
500

J amplifier

The Contractor

represent the Client during the
receipt
of the manufactured / supplied cooling

loop
components for the 1
00
-
500

J

amplifier
,
designed

under
D5

above
.

The m
axim
um anticipated
number of hours for
the
receipt of such components

is
200.

The
Contractor
shall perform this activity
for the Client on the basis of Client’s orders in writing
.

The
Contractor
shall represent the Client during
receipt
of components of
the cooling loop from
the
supplier / manufact
urer selected by the Client
.
The
detailed technical
report
produced

under
D5

above, especially under subsection
iii)
, shall form the documentation for the manufacture of the
cooling loop components
.
The
rece
ipt of the components

shall take place at the
supplier /
manufacturer premises
,
whereas

these premises

are

expected to be
located in Europe
.
The
Contractor
shall be obliged to
accept
, on behalf of the Client, only those components
that fulfill the

technical specifications
defined in the t
echnical

report

produced
under
D5

above
,
especially in
accordance with
the
subsection iii)
.
Client’s representatives
will be
a part of the team

accepting the
manufactured components
.


D
7

A
ssembly, test
ing and optimization
of
the
cooling loop of a
1
00
-
500

J laser
system amp
lifier

The Contractor

shall assemble the
cooling loop of a
1
00
-
500 J laser system amplifier

(
the maximum
laser
energy
per pulse
produced by
one

laser head is 250

J.
)
,

at its own premises
.
Subsequently, the
Contractor shall
examine

parameters of this loop during
a
test operation and
shall
optimize its
operati
on
parameters
.
The cooling loop shall be assembled from components supplied by the Client
,

produced in accordance with the technical proposal elaborated under
D5,
and
received /
handed

Page
4

over under
D6.

For the purposes of testing and optimiz
ation of

the

cooling
loop

parameters
, the Contractor shall
provide

all necessary diagnostic and measur
ement

equipment
.
These
diagnostic

tools shall measure
the temperature of the He co
olant
,
the
flow velocity
,
the flow
profile
and
the heat
distribution

in the
gain

medium
.
The sensors
and the control system
for
the loop

operation
, which
will
be permanently
built
-
in

in the
loop
,
will

be provided by the Client
.


D8

Handover of the cooling
loop of a 100
-
500

J amplifier for transport to the Client’s
forwarding agent, re
-
assembly and commissioning of the loop at the ELI
-
Beamlines center

The Contractor shall disassemble, pack and hand over the cooling loop at its premises to the Client’s
forwar
ding agent; the Contractor shall notify the Client of the specifications and terms for the
transport at least 60 days in advance.

The Contractor shall re
-
assemble and commission the 100
-
500

J amplifier cooling loop at the ELI
-
Beamlines center, and will ha
nd the commissioned loop over

to the Client
, including
the
operation
manuals for

the loop. For this purpose the Client will ensure transport and/or manipulation of all
heavy components within the ELI
-
Beamlines building.

The Client shall secure a liquid nitrogen supply system and the supporting infrastructure for the
purposes of installation and commissioning of the
cooling loop
. The Contractor will provide the
measurement and assembly equipment necessary for the installat
ion of the Technology
.

For the
purpose of installation the Client will also provide common mechanical tools, mounting and assembly
equipment including fasteners and fittings, cryogenic tubing to connect the cooling loop to the LN2
supply, and vacuum tubing

to connect the loop to the roughing and backing vacuum circuits.

Similarly to D7 above, the Contractor shall provide, for the purposes of testing and optimization of
the cooling loop parameters, all necessary diagnostic and measurement equipment. These
diagnostic
tools shall be capable to detect the temperature of the He coolant, its flow velocity, the flow profile
and distribution of heat in the gain medium.

The output of this Deliverable is commissioned and accepted cryogenic cooling loop of a 100
-
500
J
amplifier at the ELI
-
Beamlines facility.


D9

Post
-
warranty service

of the cooling loop of a 100
-
500

J amplifier
for the period of 5 years
after completing Deliverable D8

The Contractor shall provide post
-
warranty service of the cooling loop of a 100
-
500
J amplifier for the
period of 5 years after completing Deliverable D8, in the extent of 25 service days.




2
.
Internal structure of the ELI
-
Beamlines facility

Arrangement of the laser halls, of the experimental halls and of the support technology floor
in the
ELI
-
Beamli
nes building is shown in Figure
1.

The cryogenic
units

will be
located in the first floor, in
technology halls situated above the laser halls in the ground floor.


Page
5


Figure 1. Axonometric view of the internal structure of ELI
-
Beamlines
laser building (basement, ground floor,
first floor). The central units of the cryogenic loops will be located in the upper technology floor (first floor),
supplying coolant to lasers located in the below ground floor
.



3.
Layout of multislab laser amplif
ier

3.1
Amplifier internal geometry

The
active medium consists of an array of slabs. The
pumped (illuminated by pump laser diodes)
section of
each slab

is

surrounded by
cladding and by a mechanical frame,
as shown in

Figure 2.

The
anticipated
dimensions of active medium (i.e. pumped
section
) of
the multislab laser amplifier

(
length
along
z

axis direction,

width
along

x

dir
e
ction
,

thickness
along
y

direction
) are

-

60 x 60 mm²
(length x width)

and 64 mm (total thickness) for 100 J amplifiers,

-

100 x 100 mm²
(length x width)

and 64 mm (total thickness) for 500 J amplifie
rs.


In the latter case the
maximum energy
generated by one head is

250

J
.


The
baseline design
of the
active medium dimensions assumes the damage laser fluence
of
5

J/cm²,
laser
pulse duration <10 ns, laser intensity spatial modulation <
50%

and the filling factor 70%.




Page
6

The assumed dimensions of the non
-
optical parts (
cladding and
mechanical support
) of
the
laser
head

are
(
length
along
z

axis direction,

width
along

x

direction
,

thickness
along
y

direction
) are
:

-

300 x 160 mm² (length x width) and variable thickness (*) for 100 J amplifiers,

-

400 x 200 mm² (length x width) and variable thickness (*) for 500 J amplifiers.

The variable thickness
(*)
refers to the shape optimizing properties of
thermo
-
hydraulic
flow

T
he amplifi
er

has to be actively and uniformly cooled

to avoid
large thermal gradient
s

in the
slabs
.
For this

purpose

sides

of the
slab

are

cooled by forced convection
of gaseous He
.

T
he a
mplifier is divided into
typically 8
slabs sepa
rated by cooling channels,

a
s shown in
Figure 2
. The
baseline
number and thickness of the amplifier slabs and
of
the cooling channels are:

-

8 slabs
8

mm thick (8x8 = 64 mm) for both 100 J and 500 J amplifiers,

-

9 cooling channels of 4 mm thick (9x4 = 36 mm) for both 100 J and 500 J amplifiers.






Figure 2. Geometry of a cryogenic Yb:YAG amplifier head

indicating the

side view (left) and isometric view
of
the slabs
(right). In a baseline configuration
analyzed numerically within ELI
-
Beamlines and HiLASE the
number of slabs=8, d=8

mm, w=2

mm
.


The d
istribution of
heat distribution across the slabs is shown in Figure 3.
The dissipated heat
decreases towards the center of the amplifier. Across the slab dis
continuity of heat distribution is
observed on the
active medium / cladding

interface, due to strong absorption of the spontaneous
emission. Beyond th
is

interface the heat deposited in the clad
ding

decreases
approximately
exponentially towards the edges


Page
7


Figure
3
.

Dissipated heat
generated in Yb:YAG slabs with Cr:YAG cladding, showing heat
deposition along the beam propagation axis (top)
, distribution of the
heat in one slab with
22.5

mm wide
cladding (left)

and distribution of the generated heat
in one
slab with 30

mm wide
clad
ding

(right)
.


3.2
Amplifier thermal heating

The ELI
-
Beamlines facility will employ one or several high
-
energy diode
-
pumped solid state lasers
(DPSSL), operating at nominal repetition rate of 10

Hz, as pump devices for
broadband
am
plifiers

delivering
ultra
-
short pulses
. The nominal time diagram of the pump
light
(
typically at the
wavelength 940 nm)

for the active medium based on Yb:YAG is

shown in
Figure 4
. The pump

duration
is nominally 1 millisecond and the repetition rate is 10 Hz.


For 10 Hz repetition rate and for 1

ms duration of the pump pulse
s

the average power is equal to 1%
of the peak power which
amounts to

5 kW/cm² assuming pump light fluence

5

J/cm
2
.



Figure
4
. Nominal

time diagram for
the
pump

light delivered to
Yb:doped
active medium from
pump

diodes.


Page
8


S
imulations and
preliminary

design
of the

amplifiers and
the
cryogenic loops assume:

-

C
onversion efficiency from the diode pumping light (
typically
940

nm) to the laser light (1031

nm
for YAG) equal to 30 % at 1
6
0 K (i.e. 70% dissipated in active medium as thermal heating).

-

U
niform thermal heating in time from
the
diode pumping light
since

the
duration

of 1

ms of the
pump pulses is short compared to t
hermal timescales.

-

P
erfect uniformity of thermal heating across the active medium (plane
x
-
y

cross
-
section
in

Figs. 2
and 6
) dissipated from the diode pump power,

-

L
ongitudinal profile (
y

direction
in
Figs. 2 and 6)
of
the
dissipated pump light (i.e. therma
l heat
load) giv
en
by
:



))
.(
exp(
)
.
exp(
.
L
y
y
A
P
dissipated














w
here

A = constant (dissipated heat in W.cm
-
3
)
,

= 0.2 (baseline value)
,
y = axial distance alo
ng y
axis in the active medium,
L = total length of the amplifying medium and arbitrary chosen = 6.4 cm
.

In both 100

J and 500

J laser

design, the dissipated heat is ~14.4 W
cm
-
3
.

The longitudinal profile of the dissipated heat is

shown
below
in
Figure 5.



Axial distance [cm]

Figure
5
:

Longitudinal
profile of
dissipated heat
in the nominal configuration (uniform doping). The
dependence

is displayed
in relative units withou
t the constant A in the Equation above.


The total pump power and the dissipated power
in the active medium for the
case of
100

J and 500

J
laser amplifiers
running

at 10 Hz repetition rate and for 1

ms duration
of the pump pulses
are:

-

Amplifier 100 J:


Pump power (average) =

3.3 kW,

Dissipated power (average) =

2.3 kW

-

Amplifier
500 J:


Pump power (average) =

16.7 kW

Dissipated power (average) =

11.7 kW


3.3
Cryogenic and
v
acuum design for
a
mplifiers

Operation

employing

forced flow

of cryogenic He gas
requires
a

vacuum enclosure (cryostat) to avoid
condensation on cold surfaces
.

F
our
optical
windows are
thus
required
for each amplifier,
with two
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0
1
2
3
4
5
6
7
Axial distance (mm)
Dissipated power (a.u.)
Total dissipated power

Left pump light
dissipated power

Right pump light
dissipated power


Page
9

of them for vacuum
-
atmosphere interface and two others for vacuum
-
cryogenic cool
ing fluid
separation
.

The
size

of the windows (vacuum and helium) ha
s

to
provide

a minimal margin of 1

cm
on the
laser
beam edges (and hence on the pumped region of the active medium)
.

The maximal
cumulated
thickness of optical window
s

in one amplifier has to be
lower than 200 mm and has to ensure a
maximal deformation of each window
less

than 5

m
, at the operati
ng

He pressure
estimated to
be
1

MPa

or less
.


4.
N
ominal specifications

for
cooling

of the active medium

Besides the need
for removal of

the heat dissipated

in the active medium and
the
cladding
,

the
operation

of the lasers call
s

for a

possibility of fine temperature control

the
of the
slabs

around

the
design

temperature
(~160

K
)

and for
variability in
setting the operati
ng

temperature
between 100

K
and 200

K.

As shown
in

Figure
6

several

t
hermal gradients
will
exist in
the
amplifier
slab:

between inlet and
outlet of the cooling
gas

(

T
fluid
),
between the cooling gas

and
the
edge

of the
gain medium

(

T
wall
),
and

between
the
edge

of the gain medium

and
its

center (

T
medium
).


T
medium

represents the maximal temperature difference inside

the
active medium and is
a
function
of
the
amplifier design, material proper
ties, amount of dissipated heat,

and cooling loop operati
on

conditions.

The

require
ment is that

the cooling loop ensure
s


T
medium

lower than 3K.



Figur
e
6
:
Summary

of t
he t
hermal gradients
existing
in
the face
-
cooled active medium
slab
.



5.
Cryogenic amplifier operation modes

The ELI
-
Beamlines c
ryogenic
s
ystem shall be
designed to ensure

continuous and automatic operation
for
up to 8000

hours without any maintenance.

Figure
7

re
presents

the
envisaged

working
-
day
duty cycle for
the repetition rate lasers at
ELI
-
B
eamlines
,

consisting of

4

sessions

each with duration of

15 minutes at full performance (100
to

500

J

pulses
)
. The
time

periods

needed for warming up

and
shut
-
down

of
the
laser
must

not exceed 2
hours.


Page
10



Figure
7
.

Baseline

workday

operation
scheme of the repetition rate lasers

using cryogenic cooling
; the
lasers are expected running for users in 4 sessions each with duration of 15 minutes.


Besides

the daily
operation scheme

the warm
-
up
and cool
-
down
of the amplifiers should
impose

low
thermal stress on the gain medium
.
For this reason
the
temperature
ramp
-
up
(ramp
-
down
)

rate
is
required

not to exceed

1 K/h
, with
temperature difference
across

the amplifier
at a time not
exceeding

20 K.

In case of any
emergency stop

or utility losses (LN2, compressed a
ir, water, vacuum, electricity)

the
cryogenic system has to ensure safety
of the
person
nel
and

of the

equipment
.

The availability of the
cryogenic loop

for users
has to be at least 95%
over 200 workdays a year
. The
requ
ired
reliability
is

at least 98% during
200

working days

a year
.

Not
e

Specific
dimensions, figures and details concerning

the
laser
amplifie
r

head
,
amount of
dissipated
heat
,
materials, required
th
ermal gradients, operation mode
, utilities and building layout
related to
the
cryogenic

systems

will be
communicated to the Contractor
upon signature

of the contract

and can
be re
-
iterated by beginning of works on Deliverables D4 and D5.



6
. C
ryogenic loop
layout

6
.1
Generic c
ooling
scheme

A
generic

layout

of the required cryogenic cooling loop for
evacuation of heat from the multislab high
energy
laser amplifiers is
shown

in

Figure
8
.

The
loop features

forced flow of
gaseous helium
circulation
across

the amplifier
head
; h
elium as a
coolant is chosen for its low refractive index and its
high thermal conductivity
.

The main components of the cryogenic loop
involve
:

-

laser amplifier
head
;

-

one
circulati
on
pump;

-

one heat exchange
r connected with a cold source;

-

temperature control system (not
represented

in
F
igure

8
);

-

He
gas management system for discharging and filling the
loop;

-

transfer lines (cryogenic and

warm

) interconnect
ing

the amplifier
head

and
the
cooling
system.

8h

9

10

11

12h

13

14

15

16

17

delay

max 30 min

Experimental
run

15 min

18h

Warming up

Shutdown

Laser
preparation

10 min

65 to 110 min


Page
11





Figure
8
. Generic

scheme of the
required
c
ryogenic cooling loop

with

its
major
components
.


F
orced flow
of
helium
gas
across

the

amplifier
head, i.e.
across

the
space

between the slabs of active
medium
,

will remove the dissipated heat
while maintaining

an acceptably low

temperature
gradient
along the
slabs
in
the flow direction
.
The f
low with
an
adequate velocity profile
shall be supplied

at
the inlet of the
laser head

to
ensure

cooling

that provides

the
required

temperature
profile
of the
slabs
.


6
.2
Normal operation

To remove the
heat lo
a
d

dissipated in the amplifier

and to reach the nominal working temp
erature of
the slabs (100
-
200K)

t
he cryogenic cooling capacity could be either provided by a refrigerator
(Brayton cycle) or by a liquid nitrogen (evaporation of LN2 at 77 K).
The l
atter solution using liquid
nitrogen is preferred.


6
.3.
Cool
-
down and w
arm
-
up

The temperature control system will also be used for the temperature ramp down and ramp up for
the cool
-
down and the warm
-
up of
the laser

amplifiers as specified

above
.




7
.
Integration of the cooling loops into the ELI
-
Beamlines b
uilding

As
mentioned

above
,
the
laser amplifiers are installed
on

the
ground
floor of the ELI
-
Beamlines
building while

the
central
cryogenic
cooling units are located on the

first floor. T
he t
ransfer cryogenic
lines connect the
se

two parts through ceiling
penetrations

with size
500x500

mm
.



Page
12


Figure

9
.

Vertical layout of

the cooling loop of a cryogenic amplifiers head.

The equipment located on
the first (upper) floor involves He circulation
pu
mp
, LN2/He heat exchanger
,

He
gas management
system, and
temperature control.


Figure
9

shows

the

required layout

of the
cryogenic loop
s

in
the
ELI
-
Beamlines

building
. The design
must

feature the following distances/dimensions
:

-

height of the
laser
head

(
optical axis
) at 1300 mm from
the
ground floor

level;

-

elevation

of
first

floor
above the ground floor
7000 mm (5400 mm + 1600 mm
);

-

t
ypical

distance between the interconnection lines (axis) 2860 mm
;

-

ceiling penetration size

500
x500

mm.


Installation of the
cryogenic loops in
the
ELI
-
Beamlines

facility
will have to use

the main
load lift and
service doors that allow transporting equipment with
overall dimensions
not exceeding
4
x4

m

and

2.5

m
height
, and with weight of up to 5

tons
.

No
overhead cranes

will
be
available

on

the
first floor
of

the
ELI
-
Beamlines

building

and consequently
the cryogenic loop design shall
involve
local handling devices for
manipulation and
maintenance.



8
.
Power supplies and services

This chapter gives a preliminary
description

of utilities
which will be available

at the
ELI
-
Beamlines
facility and which
can

supply
the cryogenic loops.

5.1
Electrical
power supply

All subsystems using electrical power supplies must employ
230 V/ 50 Hz single phase and/or 400

V
/50

Hz 3
-
phase European standard
400

V (3P

+

N)
.
Electrical power supply and grounding interfaces
will be available
at
ELI
-
Beamlines

for pump motors, electrical heaters, electrical cabinets
, etc
.


Page
13

All electrical components shall be in accordance with the
international electrical standards (IEC).

5.2
Compressed air

Clean dry compressed air (pressure 10 bar, oil <0.01

mg/m
3
,
-
40°C dew point,

meeting ISO 8573
-
1
standard) will be available across the ELI
-
Beamlines facility

for pneumatic actuators (valves).

5.3
Cooling water

Dedicated c
ooling water
circuit will be available at ELI
-
Beamlines, providing 19° C de
-
mineralized and
de
-
ionized water, for motor or pump cooling.
The system can also use standard utility water circuit
(
approx.
0.5 MPa pressure, 0.25 MP
a max
.

pressure drop,
temperature 20

to
25
°C
)
.

5.4
Ventilation / air conditioning

Standard air ventilation will be provided at the first technology floor of the ELI
-
Beamlines laser
building, ensuring nominal temperature of 20°C and 50% humidity.
The laser
halls of laser building
will feature cleanliness environment Class 10,000 (ISO 7), at temperature 21°

C with long
-
term
stability +/
-

0.5°

C, and at humidity
40 to 60% RH.

5.5
Vacuum system

The primary vacuum (about 10
-
2

mbar) both for roughing and backing
purposes will be available at
ELI Beamlines from a central base
-
build distribution (DN250 and DN100 ISO
-
K), and consequently
primary vacuum pumping should not be part of the cooling loop design.

5.6
Control system

The
ELI
-
Beamlines

cryogenic system will be
controlled

by central

control system with interfaces with
the laser control system. The cryogenic control system shall ensure automatic control and safe
operation and safe shutdown in case of a failure. Each cryogenic loop will be

supplied with associated
electrical cabinets and a local Programmable Logic Controller (PLC). The control system architecture
will be specified by the Client
within 3 months after

signature
of the contract
.