Transcript ILC R&D Long Term Plan Development H. Padamsee For the S2 Task Force S2: Task Force: Overview & Charge • Task force was set up by.

ILC R&D
Long Term Plan Development
H. Padamsee
For the
S2 Task Force
S2: Task Force: Overview
& Charge
• Task force was set up by the Global R&D board to define
a segment of the overall ILC R&D Plan
• The ILC R&D plan includes building and testing a string
of cryomodules after the proof of principle milestone of
reliable production of cavities (S0) and single
cryomodules (S1) has been achieved.
– The desired string for the ILC R&D plan may consist of one or
more RF units.
– Determine how many RF units are needed for system tests for
R&D
• Some of the crucial specifications of the string have
been defined in the R2 ranking of the R&D issues in the
TRC report (2003). More specifications may be
necessary. Update the reasons
– Examples of the parameters to be determined are : the
performance specifications, the nature and duration of the tests,
final environmental conditions.
Charge Continued: Test Linac, Relationship to
Industrialization and Production
• Do the RF units need to be in a string (or test
linac) for further system tests?
– Is beam needed?
• The number of modules required for S2 is likely
to be large enough so that industrialization may
be required
– The Plan should show how the transitions from proofof-principle to the S2 Milestone and start of main linac
production could be accomplished.
Members
• Hasan Padamsee (Co-Chair), Tom Himel (CoChair)
• Bob Kephart
• Hitoshi Hayano
• Nobu Toge
• Hans Weise
• Chris Adolphsen
• Consultants: Sergei Nagaitsev, Nikolai Solyak,
Lutz Lilje, Marc Ross, Daniel Schulte
General Remarks
• Work is still in progress
– No Final Conclusion have been reached
• The task force’s work is open.
• Regular phone meetings, some face-to-face
meetings
• Comments are welcome from people who
choose to follow our work.
• Wiki page available off the linearcollider.org
website via the Global R&D board wiki or at:
http://www.linearcollider.org/wiki/doku.php?id=rdb:rdb_external:rdb_s2_home
• Email list and email archive are available via the
wiki.
Process 1: Working Forward
• Review TRC R2 recommended tests and revise list
• Determine generic lessons learned from the
operation of TTF and other SRF based accelerators
– How are these lessons applicable for S2 tests and ILC
• Assess number of RF units needed for planned
activities
• Assess if beam is needed
• See what assemblies and tests are presently done or
planned at
– FLASH (TTF-II), SMTF (ILCTA@FNAL), STF
• Assess their timelines
– compare with S0, S1, TDR
• Evaluate impact of XFEL plans on S2 needs
Process 2 : Working Backward
(From Industrialization and Production Scenarios)
• The Plan should show how the transitions from
proof-of-principle to the S2 Milestone and to the
start of main linac production should be
accomplished.
– Look at how previous high tech projects have been industrialized
– Make model (s) for the cavity/cryomodule industrialization
plan(s) to prepare for ILC construction
– Work backward to determine where R&D needs to be over
intervening years between now and construction
– Evaluate infrastructure needed for industrialization preparation
Process 1:
Examples Under Discussion
• Tests with < 1 RF Unit
– (e.g. at cryomodule test stand
• Tests with 1 RF Unit
• Tests with a few RF Units
• Tests with N >> 1 RF Units
Tests With < 1 RF Unit
e.g. at cryomodule test stand
• Test reliability of components.
– Of particular concern are components with long MTTR such as
tuners, piezos, and couplers.
• Use ILC design piezos, tuners, HOM, and cryomodule
• Measure dark current in cryomodules
– cryo load
– radiation
• Important for electronics and personnel in tunnel with RF on.
• Check for cavity and quad vibration due to use of piezo
tuners
Tests Which Can Be Done With <1 RF Unit (con’t)
e.g. at cryomodule test stand(s)
• Test transportability of cryomodules
• Test compatibility of cryomodules from mixing
those of different regions
• Try a dirty vent on some cryomodules and
evaluate extent of damage and recovery
• Do above with a fast acting valve to see effects
both of valve and of the dirty vent
• Provide a test bed for evolving industrially
produced cryomodules.
– desire to test preproduction cryomodules before full
production released
One RF Unit Tests
(y = with beam)
• Demonstrate that we can make an RF unit to ILC spec
for gradient, Q, dark current
– Evaluate cavity quench, coupler breakdown rates and recovery
times at 31.5 MV/m for long-term operation
– Check static and dynamic cryo heat loads at spec (y)
– Are these commensurate with the operational expectations
• Test RF fault recognition and recovery software (y)
– Insure that adequate instrumentation is available to sense likely
faults. (coupler breakdowns, cavity quench, broken tuner motor,
broken coupler motor, defective sensor…
• Check for trapped HOMs including between the cavities
using final cavity spacing
• Check beam phase and energy stability (y)
• Provide an RF unit for LLRF tests for several years (y)
More than One RF Unit
• Measure dark current
– effects cryo load
– how much dark current is accelerated
– How much radiation
• Important for electronics and personnel in tunnel with RF on.
• Check cryo control (maintain liquid levels,
feedback time response etc.) and vibrations due
to cryogen flows
• Mock up actual tunnel layout to explore
installation, maintenance, and repair issues prior
to large scale construction of ILC
– could influence civil designs
Tests needing N >> 1 RF Units
(probably not practical)
• Check for emittance growth due to cavity
misalignments
• Check for emittance growth before and
after DFS steering
Next Steps for Process 1
• Digest system tests done at TTF, SNS…
– (e.g next slide)
• What tests from previous lists can be done at
TTF-II/FLASH?
– Start a dialog between S2 and TTF-II
•
•
•
•
Compare time lines
Estimate costs
Adjust scope to match budgets
(reality check) !
Down time weeks 16-32
Total downtime: 370.8 h (13%)
Water: 1%
Magnets: 2%
Protection: 2%
Controls: 3%
Other: 3%
Photonline: 5%
Laser: 6%
Kly/Mod
LLRF
24.2 h (7%)
Laser
20.5 h (6%)
Photonline
17 h (5%)
Controls
10 h (3%)
Protectionsystems
LLRF: 7%
Klystrons / modulators:
71%
We urgently have to detail this; about 50% was one
single event (bouncer circ. capacitor)
9 h (2%)
Magnets
7.6 h (2%)
Water
4.2 h (1%)
Diagnostics
Operator
Klystrons / modulators is the sum of both plus
waveguides, pre-amplifier, interlocks….
264.7 h (71%)
1.5 h (<1%)
1 h (<1%)
Vacuum
0.8 h (<1%)
Other
10.3 h (3%)
Process 2 : Working Backward
(From Industrialization and Production Scenarios)
• The Plan should show how the transitions from
proof-of-principle to the S2 Milestone and to the
start of main linac production should be
accomplished.
– Look at how previous high tech projects have been industrialized
– Make model (s) for the cavity/cryomodule industrialization
plan(s) to prepare for ILC construction
– Work backward to determine where R&D needs to be over
intervening years between now and construction
– Evaluate infrastructure needed for industrialization preparation
Examples Studied
• LEP-II SC system evolution
– 350 MHz, Nb-Cu Technology
– Total 72 modules
• LHC evolution
– 1250 magnet modules, 15 m long
• Need to compare with XFEL scenario as it
develops
>120 modules
6 modules tested in TTF-II (string test)
288 Cavities Total…ILC 16,000,
Active length = 500 m
4 cavity module, 11.3 m long
72 Modules Total...ILC = 2000
36 klystrons
LEP-II Cavities Delivered
19 modules
delivered
12 accepted
50/year
20/year
6 years total
29/year
24/year
12/ year
4/year
Brief Remarks for LEP
– 4 modules installed in LEP for initial system
tests (Total 72)
– Many lessons learned
• Couplers, pondermotive oscillations, controls
LHC: R&D, Pre-Series and Production
Phases, Total CM
10000
Series
Series1
LHC
String
Test
100
1m
10
10m
PreSeries
LHC
Project
Approval
15 m
1
19
91
19
92
19
93
19
94
19
95
19
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
Modules
1000
R&D With Industry Phase
Before LHC Approval
• Initial R&D with industry, 1991 – 1994
• 7 x 1.3m magnets/modules ordered from 5 firms
• 7 x 10 m long magnets/modules ordered from 4
firms
• LHC string test first reached design field in Dec
1994
– 2 dipoles and 1 quadrupole
• LHC approved in Dec 1994
• LHC String test complete Jan 1999 (4 year test)
LHC String Test
•
•
•
The String has been an invaluable test-bed for
LHC systems such as cooling, vacuum and
magnet protection and has also served as a
training ground for the String team and operators
The String began operation in December 1994,
just before the … LHC project was approved.
Since then five experimental runs have been
carried-out. The first runs were aimed at
validating the design choices for the individual
systems. The emphasis then shifted towards
optimisation of the design, while later
experiments were designed to highlight any weak
points through artificially induced fatigue on
components and the interconnections between
them.
XFEL Scenario ?
Production
50
Series1
40
30
20
TTF-I
TTF-II
Preproduction
10
0
1998 2000 2002 2004 2006 2008 2010 2012
Example Scenario for S2 Plan
Under Discussion
• An Evolutionary Picture
• Three stages
• Need to examine each relative to ILC
timeline, XFEL plans & timeline,
Stage-0
• Parallel regional efforts to attain experiences in building
and operating a small number (N0= 1-2) of RF units
driving some cryomodules, in each of the three regions.
• Objective: Build up minimal infrastructure and capability
in each region.
• Performance: We aim at attaining the ILC-grade
performance but we might not clear the ultimate
performance goals.
• Compatibility: The components to be built in each region
might NOT be completely compatible in a “plug-andplay” manner.
• Note: This corresponds to the present initial-phase
activities at STF@KEK or ILCTA/SMTF@FNAL.
Example: FNAL (Expanded from SMTF Plan)
Cryomodule
Modulator
Photo-injector A
Modulator
Number
07
1
08
2
09
3
10
4-5
load
klystron
cryomodule
cryomodule
klystron
Photo-injector B
Modulator
Year
cryomodule
Photo-injector B
Modulator
load
klystron
cryomodule
cryomodule
Cryomodule IV
klystron
Photo-injector B
Cryomodule IV
Cryomodule IV Cryomodule IV
By FY10, One RF unit= basic building block of ILC ML
By FY11, Two RF units
ILC RF unit = three ILC Type IV cryomodules, modulator,
10 MW klystron
Type IV design will
not exist until FY07
~ 2 years before a
module is delivered
Stage-1
• Parallel regional efforts to build some number (e.g.
N1=1) of RF units each driving 3 cryomodules, in
each of the three regions.
• Objective: Establish globally compatible ML
technology standard and common component
design.
• Performance: We aim at attaining the ILC-grade
performance but we might not clear the ultimate
performance goals.
• Compatibility: The components to be built in each
region are under strong guidance to enforce mutual
compatibility (eg, US cavity can fit in Asian
cryomodules hooked up to European RF system, etc,
if one chooses to do so.
• Note: This might correspond to the next-phase
activities at STF@KEK or ILCTA/SMTF@FNAL.
Stage-2
• Joint global efforts to build additional numbers (e.g. N2 =
1) of RF units each driving units 3 cryomodules, to be
contributed from each of the three regions to the agreedupon facility of choice.
• Objective: String Test for ILC, Improve readiness for ILC
ML construction.
• Performance: We hopefully clear the ILC goals.
• Compatibility: The components to be built in each region
are under strong guidance to enforce mutual
compatibility.
N= 1 - 2
U. S. Cryomodules
ILC Cryomodules
Model -Kephart
200
24 modules,
8 RF Units
150
ILC const
ILC Ind
ILC R&D
100
Purchase
Infrastructure
50
t0 = project approval
t0 + 7
t0 + 2
t0
t0 - 2
0
t0 - 5
Cryomodules per Yr
250
Conclusions
• We are defining goals for S2
• We try to make S0, S1, S2 consistent
– Number of cavities, timeline…
• We need to adapt the plan to available funding
• What is clear so far:
– It is a large effort
– What can be done in TTF-II?
• There is much work yet to be done to finish our
plan