Transcript ILC Cryogenic Systems Status Tom Peterson for the cryogenics global group 13 July 2006

ILC Cryogenic Systems Status
Tom Peterson
for the cryogenics global group
13 July 2006
Sources of information
• TESLA TDR
• XFEL talks and reports
» Most recently, "XFEL civil and cryoplant", by Wilhelm
Bialowons and Bernd Petersen at
http://ilcagenda.cern.ch/conferenceDisplay.py?confId=366
• Bernd Petersen, et. al. (DESY) direct
communications
• Tuesday morning systems status
webex/teleconference presentations and
discussions
» http://ilcagenda.cern.ch/categoryDisplay.py?categId=58
• Tuesday morning CF&S videoconferences
» Also direct communications with Tom Lackowski, Emil
Huedem, and others
Cryogenics, 13 July 2006
2
Main linac information
• Mostly by direct communication
» Chris Adolphsen
» Nikolay Solyak
• And from TESLA TDR and XFEL concepts
Cryogenics, 13 July 2006
3
RTML information
• Very informative and up-to-date wiki
page with information about the
cryogenics requirements for the RTML,
at
» http://www.linearcollider.org/wiki/doku.php?id=rdr
:rdr_as:rtml_cryo
Cryogenics, 13 July 2006
4
Damping ring information
• Damping ring cryogenic component
arrangement and heat load estimates
are taken from “DR Design Status”, a
talk by S. Guiducci at the DR System
Area Status Videoconference on 4 April
06.
» http://ilcagenda.cern.ch/conferenceDisplay.py?con
fId=308
• Also useful discussions with Richard
Ehrlich and Eric Smith of Cornell about
CESR RF cavity cooling
Cryogenics, 13 July 2006
5
e- and e+ source information
• Electron source parts list
http://www.linearcollider.org/wiki/dok
u.php?id=rdr:rdr_as:rdr_as_home
• POSITRON_Tuesday_Review_April.ppt
by John Sheppard, presented on April
11.
http://ilcagenda.cern.ch/conferenceDis
play.py?confId=309
Cryogenics, 13 July 2006
6
ILC cryogenic system definition
• The cryogenic system is taken to include
cryogen distribution as well as production
» Cryogenic plants and compressors
• Including evaporative cooling towers
» Distribution and interface boxes
• Including non-magnetic, non-RF cold tunnel components
» Transfer lines
» Cryo instrumentation and cryo controls
• Production test systems will also include
significant cryogenics
» We are providing input to those cost estimates
Cryogenics, 13 July 2006
7
ILC cryomodule count
Number
Cryom odule sper sy stem
Total
Number
dev ice
of sy stemscount
Total
each
ty pe
Ty pe
Description
Main Linac
936
2
1872
624
1248
standard
standard
with quad
without quad
RTML
60
2
120
64
56
standard
standard
with quad
without quad
e- source
21
1
21
11
4
6
standard
special
special
with quad
6 cav ities + 6 quads
8 cav ities + 2 quads
e* booster
22
1
22
12
4
6
standard
special
special
with quad
6 cav ities + 6 quads
8 cav ities + 2 quads
e+ Keep Aliv e
2
1
2
2
special
with quad(s)
Damping Rings
32
3
96
96
special
650 MHz
undulator
13
1
13
4
9
standard
standard
with quad
without quad
Sum total standard with quad
Sum total standard without quad
Sum total 1.3 GHz non-standard
Cryogenics, 13 July 2006
715
1313
22
8
ILC superconducting magnets
• 737 1.3 GHz modules have SC magnets
• Some SC magnets are outside of RF
modules
» 200 meters of SC helical undulators, in 2 - 4 meter
length units, in the electron side of the main linac
as part of the positron source
» In damping rings -- 8 sections of wigglers, 10
wigglers per section x 2.5 m per wiggler
» Some magnets in sources and in RTML (spin
rotator, etc.)
Cryogenics, 13 July 2006
9
End boxes and service boxes
• String end boxes are short, separate cryostats
with approximately the same cross-section as
a module
• Cryogenic unit end boxes (or “service” boxes)
are mostly offset from the beamline to reduce
drift space length between cryogenic units
» A cavern (20 meters long) will be required at each cryogenic
unit end to accommodate these offset boxes
• The following two XFEL slides and TTF photo
illustrate the concepts for string end boxes and
unit service boxes
Cryogenics, 13 July 2006
10
XFEL linac cryogenic components
This slide from XFEL_Cryoplant_120506.ppt
by Bernd Petersen
‚regular‘ string connection box
End-BOX
The ILC string
end box concept
is like this -- a
short, separate
cryostat
Cool-down/warm-up
JT
Feed-Box
Bunch Compressor
Bypass Transferline
(only 1-phase helium)
Cryogenics, 13 July 2006
11
The ILC cryogenic
unit service boxes
may be offset from
the beamline,
reducing drift space
length, with a
concept like this.
XFEL Bunch-Compressor-Transferlines
This slide from XFEL_Cryoplant_120506.ppt by Bernd Petersen
The cryogenic unit service boxes may be offset from the
beamline as shown, but they would be larger. Drift space is
reduced to about 2 meters on each end plus warm drift space.
Cryogenics, 13 July 2006
12
TTF cold-warm transition ~ 2 m
Cryogenic lines
End module
Structure for
vacuum load
Warm beam pipe
Cryogenics, 13 July 2006
13
Main linac modules
• Maintain liquid level
in helium vessels
over a 143 m string
length
• Pipes sized for
pressure drops in 2.3
km cryogenic unit
• Very limited
cryogenic
instrumentation
Cryogenics, 13 July 2006
14
Cryogenics, 13 July 2006
15
Cryogenic instrumentation
• RF unit (~8 total thermometers per RF unit)
» Temperature sensors on magnet current leads
» Temperature sensor on one helium vessel per module
» Temperature sensor on quad helium vessel
• String end box
»
»
»
»
»
»
18 temperature sensors
2 liquid level sensors
2 flow sensors
5 pressure taps (tube to room temperature sensor)
2 heater controllers
3 valve controllers
» Vacuum gauges
Cryogenics, 13 July 2006
16
Module predicted heat loads
TTF typical
measured static
Dynamic predicted
at 31.5 MV/m, Q0 =
1E10, 5 Hz
Total predicted at
31.5 MV/m, Q0 =
1E10, 5 Hz
Heat loads at
40 K – 80 K level
(W/module)
74.0
Heat loads at
5 K - 8 K level
(W/module)
13.0
Heat loads at
2 K level
(W/module)
3.5
105.25
4.87
8.37
179.25
17.87
11.87
• Heat load estimates are still under
development
» May go lower with better understanding of HOM dynamic
load scaling from TESLA
» May go higher as discover forgotten sources of heat
Cryogenics, 13 July 2006
17
Cryogenic unit parameters
(W/module)
Predicted module static heat load
(W/module)
Predicted module dynamic heat load
Number of modules per cryo unit (8-cavity modules)
(kW)
Non-module heat load per cryo unit
Total predicted heat per cryogenic unit (kW)
Heat uncertainty factor (on static only)
(kW)
Design heat load per cryogenic unit
(g/s)
Design mass f low per cryogenic unit
(kW)
Design ideal pow er
Efficiency (fraction Carnot)
(W/W)
Efficiency in Watts/Watt
(kW)
Nominal operating pow er
2K
40 K to 80 K 5 K to 8 K
3.50
13.00
74.00
8.37
4.87
105.25
192.00 192.00
192.00
0.20
0.20
1.00
2.48
3.63
35.42
1.50
1.50
1.50
2.92
4.98
43.02
155.35 141.12
206.15
236.53 450.83
198.11
0.20
0.30
0.30
158.35 773.28
15.35
788.44 2254.15
660.36
1.40
1.70
924.50
4.22
1.86
0.18
Overcapacity f actor
Overall net cryogenic capacity multiplier
(kW)
Installed pow er
(kW)
Installed 4.5 K equiv
(W/m)
Installed 4.5 K equiv per unit length
Percent of total pow er at each level
Total operating pow er f or one cryo unit (MW)
Total installed pow er f or one cryo unit (MW)
Total installed 4.5 K equivalent pow er f or one cryo unit (kW)
Fraction of largest practical cryoplant per cryogenic unit
Cryogenics, 13 July 2006
18
1.40
1.92
1103.81
5.04
2.22
0.21
3.70
5.18
23.69
0.95
Overall
1.40 multiplier
1.71
1.65
3155.81
14.42
6.34
0.61
CERN LHC capacity multipliers
• Cryo capacity = Fo x (Qd + Qs x Fu)
» Fo is overcapacity for control and off-design or offoptimum operation
» Fu is uncertanty factor on load estimates, taken
on static heat loads only
» Qd is predicted dynamic heat load
» Qs is predicted static heat load
Cryogenics, 13 July 2006
19
Heat Load evolution in LHC
Basic Configuration: Pink Book 1996
Design Report: Design Report Document 2004
Temperature
level
Heat load increase
w/r to Pink Book
Main contribution to the increase
50-75 K
1,3
Separate distribution line
4-20 K
1,3
Electron-cloud deposition
1,9 K
1,5
Beam gas scattering, secondaries, beam
losses
Current lead
cooling
1,7
Separate electrical feeding of MB, MQF &
MQD
At the early design phase of a project, margins are needed
to cover unknown data or project configuration change.
Cryogenics, 13 July 2006
20
Cryogenic unit length limitations
• 25 KW total equivalent 4.5 K capacity
» Heat exchanger sizes
» Over-the-road sizes
» Experience
• Cryomodule piping pressure drops with 2+ km
distances
• Cold compressor capacities
• With 192 modules, we reach our plant size limits,
cold compressor limits, and pressure drop limits
• 192 modules results in 2.23 km long cryogenic
unit -- 5 units per 250 GeV linac
» Divides linac nicely for undulators at 150 GeV
Cryogenics, 13 July 2006
21
Main linac lengths
modules
RF unit (lengths in meters)
string (vacuum length)
possible segmentation unit
Cryogenic Unit
without
with
quad
quad
11.271
12.543
three modules
without
quad
11.271
RF unit
RF unit RF unit RF unit end box
35.085
35.085 35.085 35.085 2.500
twelve modules plus string end box
string
string
string
string
142.842 142.842 142.842 142.842
48 modules
(segmentation box is the same as string end
box (2.5 m) and all contain vacuum breaks)
service
service
box end segment segment segment segment box end
2.500 571.366 571.366 571.366 568.866 2.500
(1 cryogenic unit = 192 modules = 4 segments*48 CM
with string end boxes plus service boxes.)
2288.0 meters
Cryogenics, 13 July 2006
22
Main linac warm drift space
half
warm
drift
space
3.136
long CU
w arm
long CU
16 strings
64 RF units
drift
space
(16 strings=64 RFU)
64 RF units
2288.0
6.271
2288.0
2294
start of
main linac
warm
drift
space
6.271
short CU
warm
short
15 strings
60 RF units
undulator
15 strings
60 RF units
2145.1
1200.0
2145.1
5042
Shaft
Shaft
(centre of drift space)
(centre of undulator)
• Presently 6.27 meters warm drift space, only between
cryogenic units
» Result of discussions with Nikolay Solyak
» Desire to minimize drift length
» Arbitrarily one module length minus 2.5 meter transition on each
end
• From cryogenics viewpoint, no strong preference for
lengths -- determine from main linac, instrumentation,
vacuum input
Cryogenics, 13 July 2006
23
Calculations of the pressure drops in the ILC Cryo Unit
Conclusions (based on inputted data):
Initial parameters A:
P inlet =
1.20
T inlet =
2.40
Heat =
0.02
Length =
3.00
Flow =
0.15
ID =
0.06
Final parameters A
P outlet=
T outlet =
Heat =
Length =
Flow =
ID =
Bar
K
W/m
km
kg/s
m
Initial parameters B:
P inlet =
0.03 Bar
T inlet =
2.100 K
Heat =
0.01 W/m
Length =
3.00 km
Flow =
0.15 kg/s
ID =
0.30 m
init qual =
T vapor =
h vapor =
init flow =
1
1.986
24982.3
0.01
1.17
2.59
0.02
3.00
0.15
0.06
none
K
J/kg
kg/s
Bar
K
W/m
km
kg/s
m
Final parameters B:
P outlet=
T outlet =
Heat =
Length =
Flow =
ID =
0.03
2.00
0.01
3.00
0.15
0.30
Bar
K
W/m
km
kg/s
m
Initial parameters C:
P inlet =
5.00
T inlet =
5.00
Heat =
1.17
Length =
3.00
Flow =
0.23
ID =
0.07
Bar
K
W/m
km
kg/s
m
Final parameters C - initial parameters D:
P outlet=
4.85
Bar
T outlet =
6.63
K
Heat =
1.17
W/m
Length =
3.00
km
Flow =
0.23
kg/s
ID =
0.07
m
Final parameters D:
P outlet=
T outlet =
Heat =
Length =
Flow =
ID =
4.57
8.03
1.17
3.00
0.23
0.07
Bar
K
W/m
km
kg/s
m
Initial parameters E:
P inlet =
16.00
T inlet =
40.00
Heat =
6.68
Length =
3.00
Flow =
0.25
ID =
0.07
Bar
K
W/m
km
kg/s
m
Final parameters E - initial parameters F:
P outlet=
14.90
Bar
T outlet =
55.09
K
Heat =
6.68
W/m
Length =
3.00
km
Flow =
0.25
kg/s
ID =
0.07
m
Final parameters F:
P outlet=
T outlet =
Heat =
Length =
Flow =
ID =
13.22
76.89
9.51
3.00
0.25
0.07
Bar
K
W/m
km
kg/s
m
Cryogenics, 13 July 2006
24
Accelerator Division / Cryogenics - M. Geynisman - April 21, 2006
Module pipe sizes updated
P ipe funct ion
BCD
name
TTF
inner
diameter
(mm)
XFEL plan
inner
diameter
(mm)
ILC
ILC
proposed pressure
i n ne r dia drop
(mm )
2.2 K subcooled supply
A
45.2
45.2
60
30 mbar
Major ret urn header,
st ructural supp’t
5 K shield and intercept
supply
8 K shield and intercept
return
40 – 50 K shield supply
B
~300
~300
~300
1.5 mbar
C
57.5
71
70
D
50.0
71
70
E
57.5
71
80
75 - 80 K shield ret urn
F
50.0
71
80
2-phase pipe
72.1
72.1
72.1
Helium vessel to 2-phase
pipe cross-connect
54.9
54.9
54.9
Cryogenics, 13 July 2006
25
0.43 bar
~1.6 bar
RTML BC2
follows main linac pattern
modules
RF units
(lengths in meters)
with
quad
12.543
without
quad
11.271
with
quad
12.543
without
quad
11.271
2 Quad
RF unit
4 typical strings like this
end box
2.500
x4 +
short
string
string
string
string
string
145.385
145.385
145.385
145.385
107.800
57 modules plus string end boxes plus 2 service boxes
(String end boxes all contain vacuum breaks)
RTML BC2
694.3
Cryogenics, 13 July 2006
without
quad
11.271
1 Quad
RF unit
2 quad
1 quad
2 quad
1 quad
RF unit
RF unit
RF unit
RF unit
36.357
35.085
36.357
35.085
Typical strings with 12 modules plus end box
service box
2.500
57 BC2 modules in RTML
with
quad
12.543
26
2 quad
1 quad
2 quad
RF unit
RF unit
RF unit service box
36.357
35.085
36.357
2.500
one short string at end with 9 modules
service box
2.500
Damping ring heat loads
e- RF module
e+ RF module
(one c avity per module)
e- wiggler
e+ wiggler
(2 .5 meters ) (2 .5 meters )
Static 4 .5 K heat (W)
D ynamic 4 .5 K heat (W)
N umber per loc ation
T otal 4 .5 K heat per loc ation (W)
N umber of loc ations
T otal 4 .5 K heat per damping ring (W)
3 0 .0
1 8 .0
4
1 9 2 .0
4
7 6 8 .0
3 0 .0
4 1 .0
6
4 2 6 .0
4
1 7 0 4 .0
5 .0
0 .0
10
5 0 .0
8
4 0 0 .0
5 .0
0 .0
20
1 0 0 .0
8
8 0 0 .0
Static 7 0 K heat (W)
D ynamic 7 0 K heat (W)
N umber per loc ation
T otal 7 0 K heat per loc ation (W)
N umber of loc ations
T otal 7 0 K heat per damping ring (W)
5 0 .0
1 0 .0
4
2 4 0 .0
4
9 6 0 .0
5 0 .0
1 0 .0
6
3 6 0 .0
4
1 4 4 0 .0
5 0 .0
0 .0
10
5 0 0 .0
8
4 0 0 0 .0
5 0 .0
0 .0
20
1 0 0 0 .0
8
8 0 0 0 .0
N otes :e+ has 3 RF modules in eac h ring at eac h loc ation x 2 rings
e+ has 1 0 wigglers in eac h ring at eac h loc ation x 2 rings
Cryogenics, 13 July 2006
27
Damping ring cryo system concept
• Four cryo plants located around each damping
ring, one at each RF location
• Each plant provides the liquid for 4.5 K bath
cooling of the RF and wiggler magnets and the
nominally 70 K shield
• At least part of each plant is underground, at
tunnel elevation, in caverns which also provide
RF power, etc.
• Wigglers are in 8 locations
» Each plant supplies two sets of wigglers, one 4.5 K / 70 K
transfer line goes 1/8 of the way around the damping ring,
through the tunnel from each plant, to the remote wigglers
Cryogenics, 13 July 2006
28
Damping ring cryo plant sizes
electron ring
40 K to 80 K
Temperature lev el
Temp in
Press in
Total predicted heat per cry ogenic unit
Number of cry ogenic units per location
Total predicted heat per location
positron ring
positron ring
40 K to 80 K
4.4 K
Temperature lev el Temperature lev el
(W)
40.00
16.0
1580.00
1
1580.0
4.4
1.2
504.00
1
504.0
40.00
16.0
1580.00
2
3160.0
4.4
1.2
688.00
2
1376.0
Heat uncertainty f actor (on static only )
Design heat load per location
Design mass f low per location
(W)
(g/s)
1.50
2330.00
11.17
1.50
684.00
35.01
1.50
4660.00
22.33
1.50
1736.00
88.84
Design ideal power
4.5 K equiv design power
(W)
(W)
10729.6
163.4
45795.8
697.5
21459.2
326.8
116230.3
1770.2
Ef f iciency (f raction Carnot)
Ef f iciency in Watts/Watt
Nominal operating power
(W/W)
(kW)
0.20
23.0
53.6
0.20
334.8
229.0
0.20
23.0
107.3
0.20
334.8
581.2
(kW)
(kW)
1.40
2.06
75.1
0.3
1.40
1.90
320.6
1.5
1.40
2.06
150.2
0.7
1.40
1.77
813.6
3.7
19.0%
81.0%
15.6%
84.4%
Ov ercapacity f actor
Ov erall net cry ogenic capacity multiplier
Installed power
Installed 4.5 K equiv
(K)
(bar)
(W)
electron ring
4.4 K
Temperature lev el
Percent of total power at each lev el
1.93
Total operating power f or one location (MW)
Total installed power f or one location (MW)
Total installed 4.5 K equiv alent power f or one location (kW)
Fraction of largest practical cry oplant f or location
0.28
0.40
1.81
0.07
0.69
0.96
4.40
0.18
Total installed power f or damping ring(s) (MW)
1.58
3.86
Cryogenics, 13 July 2006
29
Cryogenic architecture
WCS
WCS
WCS
WCS
UCB
UCB
UCB
UCB
Surface
CDB
Shaft
Surface
Shaft
Tunnel
Cryo-unit
LCB
Cryo-unit
LCB
Cavern
WCS: Warm compressor station
UCB: Upper cold box
LCB: Lower cold box
CDB: Cryogenic distribution box
CDB
Tunnel
Cryo-unit
Cryo-unit
Cryogenic architecture for shaft depth > 30 m
Cryogenic architecture for shaft depth < 30 m
For shaft depth above 30 m, the hydrostatic head in the 2 K pumping line becomes
prohibitive and active cryogenics (e.g. cold compressor system) has to be installed in
caverns (LBC), i.e. additional cost for cryogenics and civil engineering.
Cryogenics, 13 July 2006
30
Cryogenics, 13 July 2006
31
ILC cryogenic system inventory
Volumes
One module
String
Cryogenic unit
ILC main linacs
Helium
(liquid liters
equivalent)
336.6
12 modules
4038.8
16 strings
64621.4
2x5 cryo units
646213.9
Tevatron
equivalents
LHC Inventory cost
equivalents
(K$)
0.1
1.1
10.8
12.12
193.86
1938.64
0.1
0.8
Since we have not counted all the cryogenic subsystems
and storage yet, ILC probably ends up with a bit more
inventory than LHC
Cryogenics, 13 July 2006
32
ILC cryogenic plant size summary
• ILC 500 will have 12 large cryoplants
plus 8 smaller ones (not including BDL)
» 10 at about 5.2 MW for the main linacs
» 2 at about 2.5 MW for the sources and RTML’s
» 4 at about 1.0 MW for the positron damping rings
» 4 at about 0.4 MW for the electron damping ring
• Why more cryoplants in ILC than
TESLA?
» Dynamic load up with gradient squared (length
reduced by gradient), larger multipliers, lower
assumptions about plant efficiency
Cryogenics, 13 July 2006
33
Items associated with plants
• Compressor systems (electric motors, starters,
controls, screw compressors, helium
purification, piping, oil cooling and helium
after-cooling)
• Upper cold box (vacuum-jacketed heat
exchangers, expanders, 80 K purification)
• Lower cold box (vacuum-jacketed heat
exchangers, expanders, cold compressors)
• Gas storage (large tank “farms”, piping,
valves)
• Liquid storage (a lot, amount to be
determined)
Cryogenics, 13 July 2006
34
Major cryogenic distribution components
• 8 large (2 K system) tunnel service or “feed” boxes
» Connect refrigerators to tunnel components
• 8 large (2 K) tunnel distribution or “turnaround” boxes
» Terminate and/or cross-connect cryogenic units
• ~170 large (2 K) string end boxes of several types
» Contain valves, heaters, liquid collection vessels, instrumentation,
vacuum breaks
• ~3 km of large transfer lines (including 2 Kelvin lines)
• ~100 “U-tubes” (removable transfer lines)
• Damping rings are two 4.5 K systems each the size (in
terms of accelerator layout) of the Tevatron
» Various distribution boxes and ~7 km of small transfer lines
• Various special end boxes for isolated SC devices
Cryogenics, 13 July 2006
35
Cryogenics WBS levels 4, 5
(cryogenics starts at level 3)
ILC RDR C ryoge nic C ost Estim ate
Ide ntifie r
Ite m de scription
basis
1.7.2
1.7.2.1
1.7.2.1.1
1.7.2.1.2
1.7.2.1.3
1.7.2.2
1.7.2.2.1
1.7.2.2.2
1.7.2.2.3
C ryoge nic Plant & Distribution
C ryoge nic Plants
Main Linac cryoge nic plants
Sou rce and RTML cryoge nic plants
Damping Ring cryoge nic plants
C ryoge nic Distribution
Main Linac cryoge nic distribu tion
Sou rce and RTML cryoge nic distribu tion
Damping Ring cryoge nic distribution
Cryogenics, 13 July 2006
36
Unit
2 x 250 Ge V ILC
Mate rials & Se rvice s
No. of FY06 M$
T otal
units
per unit
M&S M$
$
$
$
$
$
$
$
$
$
-
Example of level 6
Ide ntifie r
Ite m de scription
basis
1.7.2
1.7.2.1
1.7.2.1.1
1.7.2.1.1.1
1.7.2.1.1.2
1.7.2.1.1.3
1.7.2.1.1.4
1.7.2.1.1.5
1.7.2.1.1.6
1.7.2.1.1.7
1.7.2.1.1.8
1.7.2.1.1.9
1.7.2.1.1.10
1.7.2.1.1.11
1.7.2.1.1.12
C ryoge nic Plant & Distribu tion
C ryoge nic Plants
Main Linac cryoge nic pl ants
Main Linac warm compressor systems
Main Linac cooling tower systems
Main Linac warm gas storage systems
Main Linac upper cold boxes
Main Linac lower cold boxes
Main Linac vertical transfer line
Main Linac purification system
Main Linac installation contracts
Main Linac cryogenic control systems
Main Linac liquid helium storage systems
Main Linac misc. (ODH, gas analysis, instrument air, etc.)
Main Linac helium
Cryogenics, 13 July 2006
37
Unit
each
each
each
each
each
m
each
each
each
each
each
lit ers
2 x 250 Ge V ILC
Mate rials & Se rvice s
No. of FY06 M$
T otal
units
per unit
M&S M$
$
$
$
10
$
10
$
10
$
10
$
10
$
$
10
$
10
$
10
$
10
$
10
$
$
-
Open issues
• Still identifying cold devices and estimating
heat loads in sources and damping rings
» Damping ring cryogenic layout is just a first concept
» Need locations of SC devices for sizing transfer lines -- have
many but not all
• Have not dealt with beam delivery system
details yet
• Want to investigate alternatives for reducing
cryo system visibility
» Compressor grouping, inventory storage grouping, pipe
sizing, etc.
Cryogenics, 13 July 2006
38
Plant cost estimates
• Cost (1998 MCFH) = 2.2*P(4.5 kW
equiv)^0.6
» “Economies of Large Helium Cryogenic Systems:
Experience from Recent Projects at CERN,” S.
Claudet, et. al., Advances in Cryogenic
Engineering, Vol 45, pg 1301, Plenum Press, 2000.
• Convert 1998 CFH to 1998 $ and then
1998 $ to 2006 $
• Need to scale from 1998 to 2006 with
proper factor, to be determined
Cryogenics, 13 July 2006
39
Scaling from 1998 costs
• For example, from CRU stainless steel price
index
» http://www.cruspi.com/HomePage.aspx
» 1998 to 2005 is factor 1.44 (consumer price index was only
1.16)
» Only have data through 2005
» Result: Cost (2005 $) = 2.16*P(4.5 kW equiv)^0.6
• Will also look at aluminum and labor
• Other more recent cryo plant cost data are
available
» Linde study for Fermilab’s ILCTA-New Muon Lab refrigerator
implies factor 1.53 for 1998 CHF to 2006 $
» SNS, and perhaps others
» CERN
Cryogenics, 13 July 2006
40
Thermal cost optimization
• Additional 1 W at 2 K per module ==>
additional capital cost to the cryogenic system
of $4300 to $8500 per module (scale plant
costs or scale whole system)
• Additional 1 W at 2 K per module ==>
additional installed power of 3.2 MW for ILC
» $1100 per year per module operating costs.
» There is room in the 2 K pipes for additional flow
• Low cryo costs relative to module costs
suggest that an optimum ILC system cost
might involve relaxing some thermal features
for ease of fabrication, even at the expense of
a few extra watts of static heat load per
module.
Cryogenics, 13 July 2006
41
Cryogenics, 13 July 2006
42