Transcript ILC Cryogenic Systems - International Linear Collider

ILC Cryogenics -Technical Design Report
Planning
Tom Peterson
ILC GDE SCRF meeting at IHEP
8 Dec 2011
ILC cryogenics for the TDR
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Cryomodule cooling scheme
Plant layout
Cryogenic unit definitions
Heat load assessments
Cryogenic plant power and sizing
Distribution system sizing
Cost estimate update
Scope of this work
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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SRF cryogenics for TDR
• Main linac cooling scheme is still the same
– Strings of saturated bath 2 K cooling
– 5 K - 8 K thermal intercepts with simplified
thermal shield
– 40 K - 80 K thermal intercepts and thermal
shield
– We always said that these temperature levels
and the associated pressures would be
optimized for integration with a cryogenic
plant
• Thermal shield and intercept flow directions will be
optimized
• Temperatures and pressure may be adjusted for
integration with cryogenic plant cycle
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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Cryomodule cooling scheme
RDR scheme was
essentially
unchanged from
the TESLA scheme
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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Optimize thermal intercept flow
Either in this manner or some similar sort of optimization
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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ILC cryogenic plant and cryogenic unit layout
Update these in collaboration with CFS,
and main linac integration -- try for 4 each side
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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Update cryogenic unit lengths
• In reducing the number of cryogenic plants per main
linac to 4 from 5 -• 4 cryogenic plants per linac results in about 240
cryomodules per cryogenic unit.
• Before the 9-8-9 cavity per RF unit concept, we had
developed an 8-8-8 cavity per RF unit layout
– 8-8-8 maximum was 204 cryomodules per cryogenic unit
– Plant size becomes approximately 25 kW at 4.5 K (5.5
MW installed power), a number we take as a limiting size
-- so very large, but still possibly one cryogenic plant
– Pressure drops and pipe sizes in the cryomodules need
to be checked for the higher flow rates and longer
distances
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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Plant spacing and lattice
Needed: linac lattice distances, total numbers of cryomodules,
locations of special items like magnets at the low energy end, other
included SC devices like undulators, impact of cryogenic system
input such as drift spaces for end boxes (magnets at each end?), etc.
This is from the spreadsheet for
8-8-8 cavities per RF unit.
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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Input parameters for heat load assessments
are needed (e.g., input parameters for 5+5 Hz)
Revised f or TDP parameters 15 Jan 11, f ixed 6 W --> 18 W f or "f ull power", 18 Jan 2011
It eration of this heat load t able wit h input f rom Chris Adolphsen,
5 on
Janbeam
07
posi tr
posi tr on pr oducti on
electron beam
Cryomodul e
"Ful l Power"
5 Hz LE DRFS e+ si de 5 Hz LE DRFS e- side 5 Hz LE DRFS e- side
E, [MV/m]
31. 5
15. 75
18. 9
15. 75
Q
1.E+10
1.E+10
1.E+10
1.E+10
Rep rate, [Hz]
5
5
5
5
Number of Cav ities
8.667
8.667
8.667
8.667
Fill time [µsec]
Beam pulse [µsec]
Number of bunches
Particles per bunch [1e10]
Beam current (mA)
595
969
2625
2.06
9.00
1190
969
1312
2.07
4.50
714
969
1312
2.07
4.50
595
969
1312
2.07
4.50
all cavities active at low gradient
RF pulse lengths from CryoPower-PHG-12jan2011.xls
21 January 2011. Rev ised low-energy 5+5 Hz operat ion per 110120-SFUKUDA-DRFS2.ppt
It eration of this heat load t able wit h input f rom Chris Adolphsen,
5 on
Janbeam
07
posi tr
posi tr on pr oducti on
Cryomodul e
E, [MV/m]
Q
Rep rate, [Hz]
Number of Cav ities
Fill time [µsec]
Beam pulse [µsec]
Number of bunches
Particles per bunch [1e10]
Beam current (mA)
"Ful l Power"
31. 5
1.E+10
5
8.667
595
969
2625
2.06
9.00
electron beam
5 Hz LE DRFS e+ si de 5 Hz LE DRFS e- side 5 Hz LE DRFS e- side
25. 59
30. 71
25. 59
1.E+10
5
8 .6 6 7
5 .3 3 3
1.E+10
5
8 .6 6 7
5 .3 3 3
1.E+10
5
8 .6 6 7
5 .3 3 3
1211
969
1312
2.07
4.50
1211
969
1312
2.07
4.50
1211
969
1312
2.07
4.50
RF pulse length = 2180 microseconds
from 110120 SFUKUDA DRFS2.ppt slide 11 bin C
ILC GDE SCRF, Tom Peterson
8 Dec 2011
16/26 active cavities per RF unit
ILC cryogenics for the TDR
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Cryogenic plant power (RDR revised)
(15 Nov 2008)
Heat and Pow er Summary (9-8-9)
Predicted module static heat load
Predicted module dynamic heat load
Number of modules per cryo unit (8-cavity modules)
Non-module heat load per cryo unit
Total predicted heat per cryogenic unit
Heat uncertainty f actor on static heat (Fus)
Heat uncertainty f actor on dynamic heat (Fud)
Ef f iciency (f raction Carnot)
Ef f iciency in Watts/Watt
Overcapacity factor (Fo)
Overall net cryogenic capacity multiplier
Heat load per cryogenic unit including Fus, Fud, and Fo
Installed pow er
Installed 4.5 K equiv
Percent of total pow er at each level
(W/module)
(W/module)
(kW)
(kW)
(W/W)
(kW)
(kW)
(kW)
Total operating pow er f or one cryo unit based on predicted heat (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)
40 K to 80 K 5 K to 8 K
75.04
10.82
82.95
7.05
192.00
192.00
1.00
0.20
31.33
3.63
1.10
1.10
1.10
1.10
0.28
0.24
16.45
197.94
1.40
1.40
1.54
1.54
48.26
5.59
793.63
1106.62
3.63
5.06
17.7%
24.7%
2K
1.32
10.04
192.00
0.20
2.38
1.10
1.10
0.22
702.98
1.40
1.54
3.67
2578.20
11.78
57.6%
3.49
4.48
20.46
Biggest change is 5-8 K dynamic heat from input coupler -- 4.5% effect on cryoplant size
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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Update power for all the plants
• Reconsider uncertainty factors and plant efficiency
assumptions
– Quantify uncertainty based on data for Q0, dark current
estimates, etc.
– Latest plant efficiency estimates from vendors are a bit
lower than at the time of the RDR
• And assess distribution line sizes and distances
– These add to the heat loads
– Update distribution scope and cost estimate
• Finally update cryogenic system cost estimate
A rea
M ain L inac + RT M L
S ourc es
D amping Rings
BD S
TO TAL
ILC GDE SCRF, Tom Peterson
8 Dec 2011
I ns talled
plant s ize
I ns talled
N umber of plants
(eac h) total power
(M W)
(M W)
1 0 .0 0
4 .3 5
4 3 .5 2
2 .0 0
0 .5 9
1 .1 8
2 .0 0
1 .2 6
2 .5 2
1 .0 0
0 .4 1
0 .4 1
47.63
ILC cryogenics for the TDR
O perating
power
O perating
(eac h) total power
(M W)
(M W)
3 .3 9
3 3 .9 1
0 .4 6
0 .9 2
0 .8 8
1 .7 6
0 .3 3
0 .3 3
36.92
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Damping ring, RTML, BDS cryo
• Cryogenics for the sources, damping rings,
RTML, and beam delivery system were
addressed in the RDR cryogenics chapter
– Are these now in their respective area
chapters?
– And those groups are writing those details?
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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How much work is this?
• Cryogenic system for TDR will be an adjusted version
of the RDR
– Revised and updated for latest layouts, input
parameters, and information
• Collaborative work with CFS, main linac, and the other systems
groups to obtain parameters and develop layouts
• Quantification of the uncertainty factors requires input from
other groups
– Relatively straightforward to reassess the cryogenic
system once given all the input parameters
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I have the spreadsheets and original work, however . . .
The design process is iterative with the the other ILC groups
Cryo layout requires input and collaboration, and
A major effort! Will require significant time
ILC GDE SCRF, Tom Peterson
8 Dec 2011
ILC cryogenics for the TDR
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