status of the crab cavity effort may 18, 2016 on behalf of wp4 · status of the crab cavity effort...
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Status of the Crab Cavity EffortMay 18, 2016
On behalf of WP4
Joint USLARP CM26/Hi-Lumi Meeting, SLAC
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• Update on the Cavity + CM production
• SPS Test preparation
Outline
2
Cost & Schedule Review (New Baseline)CM Review, Nov 2015 (Basic design choices approved)SPS Test Day I
DQW
RFD
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Revised Planning
• First Re-Baselining after C&S Review I
• US cavities delayed (+ unresolved “conformity standards”)
• CERN cavity production (DQW) for SPS is adopted as baseline
• Impact on SPS is significant
SPS test prototype (2 CM)preparation Tests (DQW)
LHC pre-series (2 CM)
Fabrication & tests Installation
LHC series production (8 Mod)
Run 2 LS2 LS3
EYET
S
Run 3 Run 4
YETS
YETS
YETS – 8 weeksEYETS – 14 weeks
Tests (RFD)
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2016 2017 2018
Qtr1 Qtr2 Qtr3 Qtr4 Qtr1 Qtr2 Qtr3 Qtr4 Jan
RF Power2 IOTs SM18
2 IOTs in BA6 (FPC Conditioning)
LLRF/Controls SM18-Vertical Tests SetupDeploy for
VTABA6-SM18 Setup High Power &
deployment
Dressed CavitiesCavity 1 Fabrication
(Treatment + Cleanroom tooling)
Cav 2 Fabrication +Cav 1 & 2 Treatment/Testing
+ Clean room assembly
FPCs 2xFPCs in SM18 CleanroomFPC Conditioning
(TB)
CryomoduleCryostat & Tooling
Design/ProcurementCryomodule/Tooling
PreparationCM Assembly Cold Tests SPS
Cryogenics Cryogenic Distribution & Valve Box SM18/SPS CM + VB
Movable Table Design & Manufacturing Tests at CERN
SPS Revised Planning
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CM-Review Recommendations (A. Yamamoto et.al)
• Clarify “the minimum functional requirement/goal” for the SPS test
• Draft acceptance criteria prepared, being revised/approved
• A decision/action on the ordering/implantation of the refrigerator
• Done
• The system integration workflow, including tooling, fixtures, and
intermediate tests must be studied in greater detail
• Now coordinated under a new WG
• The critical components such as FPCs and tuners shall be individually
reviewed (in 2016)
• Cryogenic-safety and failure-mode analyses should be performed
• 1st safety analysis approved by HSE, will review again in Fall 2016
• Reinforce the supporting system & limiting forces on the FPCs.
• Blade type supporting system was optimized
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DQW Production, Circular Trials(Lunette, Cuvette, Extrusion)
SECT X+Cu tests performed to explore shaping techniques & tooling (very systematic analysis)Circular samples show very good shape and thickness accuracies
See Talk: M. Garlasche
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Example Shaping Simulations
Dwg: LHCACFCA0067
See Talk: M. Garlasche
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Weld Map
WELD 2(x2)
WELD 3 (x2)
WELD 1(x1)
WELD 4 (x2)
WELD 5(x1)
WELD 6 (x4)
WELD 7 (x2)
WELD 12 (x2)
WELD 11(x2)
WELD 13 (x4)
WELD 14 (x4)
WELD 8 (x1)
WELD 15(x1)WELD 16(X1)
WELD 9(X4)
WELD 10(X2)
16 complex welds to qualify & perform(with tight tolerances)
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Difficult Weld
Wel
din
g Te
st Q
ual
ific
atio
n F
low
Ch
art
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Nb-Nb: W03A/B Final ellipsoidal welds :
INTERNAL SIDE - RF
INTERNAL SIDE - RF
Welding in 3mm of thickness performed on 1 side. Two configurations tested: Key (Clé) and BW (Bords droits)
BW
KEY
BOTH CONFIGURATIONS WITH SATISFACTORY RESULTS
A Sample Weld
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Status of US Cavities from Niowave
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Three welded assemblies of an 2-RFDs at JlabRF, CMM, Radiography etc.. startedExpect 1-RFD qualified and sent to CERN Mar 2017
DQWs parts being re-stamped and in a similar configuration to be sent to Jlab
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Helium Vessel
Bolted/welded concept was chosen for structural integrity & minimal stress to cavity
A dummy prototype was launched for experimental verification of assembly procedure, stress, vacuum integrity and other aspects.
They are now verified
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WELDING STEPS1- Vertical welds 2- Welds around the top/bottom plate3- Longitudinal Covers4- Circular Covers & Beam pipe
The vacuum levels remained at
≤ 10−9 mbar (5 thermal cycles)
.
Prototype Helium Vessel
Pressure tests (2.6 bar)
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Tests vs. Simulations
0.2460.237
0.001
0.080 0.080
-0.013 -0.028
0.008
0.277
0.003
0.311
0.029
0.319
0.388
0.202
0.224
0.345
0.281
0.198 0.202
0.059
0.076
0.217
0.179
-0.050
0.000
0.050
0.100
0.150
0.200
0.250
0.300
0.350
0.400
0.450
LPP UP CT_UP TP2 TP1 CB_LPP CB_TP1 CB_LP LP CT_TP2 LSP CT_LSP
MM
PRESSURE 2.6 [BAR]
MechanicalMeasurementLaboratory
BoltsWeldsFriction
Bondedcontacts
12 LVDT Position Sensors
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Cavity Stress, cool down
• ΔTmax = 40 K top/bottom of tank (input constraint)
• Stress on cavity is low (≤ 10% of allowable)
• Slower cool-down rate can further reduce if necessary
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Acid out
Acid In
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Cavity Chemistry, DQW & RFD
RFD: Bulk Chemistry on Parts & Light Chemistry on assembled cavity
Acid InAcid out
DQW: Very light chemistry on Parts & Bulk Chemistry on assembled cavity
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CERN Setup, Cavity Chemistry (PoP)
General procedure uses acid circulation between 10 − 150 C (~ 40 min, indicative)
Small tilting for trapped gas removal
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Analysis 1 2 3 4 5 6
Range (cm/s) 0.63 1.82 0.90 0.65 1.23 0.92
Standard Deviation (cm/s) 0.21 0.40 0.24 0.21 0.26 0.23
Av. Velocity (cm/s) 0.29 0.38 0.33 0.31 0.36 0.28
Data taken for 21 points throughout the cavity for each orientation
1 2 3
4 5 6
= InletAll other ports outletsGravity acts down as shown in images
Fluid Dynamics for Chemistry See Talk: T. Jones
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KEK Electro-polishing StatusEP apparatus ready waiting for the cavity
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Frequency TrackingSee Talk: S. De Silva, S. Verdu
Target: 400.79 MHz (-60 kHz)
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2K Internal Magnetic Shields
Double QW RF Dipole
• Internal magnetic shields already integrated by STFC-UK !!
• 1 mm Cryophy, annealed after shaping, supported by Ti brakets
• Controls done: dimensions, shielding reduction factor
• At CERN waiting for cavities…
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Comparison of Data and Simulations
Nominal input:Earth field (∼ 42 μT) along beam axis
SPS data taken in LSS6 zone from YETS
Reduction factor ~65
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HOM Couplers
DQW Status• Niobium pieces & other ancillaries produced• Final metrology & welding tests ongoing
before assembly
RFD material at CERN, fabrication in 2016
See Talk: M. Garlasche
HOM Testbox
See Talk: J. Mitchell
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HOM Lines
• Optimized for static/dynamic heat
loads to 2K
• Coax line for 1 kW, 316LN, Cu
sputtered (5𝜇m)
• Flexibility using spherical joints &
themalization with alumina disk
• Destructive tests for validation 2016
Test box
Cavity side (2K)
Load side (300 K)
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Tuner Tests (on PoP)
Repeatability preceision
~0.5 μm ~ 100 Hz
Tuner preparation for Cold Tests planned during Jun 2016
• Assembly into SM18_V3 & protection for cooldown actions ongoing
• PLC based control system successfully tested in a feedback loop
See Talk: A. Castilla
Freq request
Tuner motion
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Tuning Fixtures
• Warm frequency tuning limited by tuning fixture
• Limiting factor is the strength of NbTi fixture and weld
• CERN (NbTi), USLARP (Nb with reinforced shape)
Nb fixture with helicoil
DQW Pre-tuning: ≥ 0.3 mm permanent deformation
RFD: ∼ 1.4 mm (7000 kN elastic limit)
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Power Coupler
2 DQW + 2 RFD Couplers by end of May (spares in Oct)
RF Test box ready by Sept. Clean room assembly in OctTwo DQW couplers ready April 2017
Most FPC parts (+spares) completed
RFD DQW
RF Test Box
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RF Amplifier
Modification of the existing IOT station to 400 MHzNew output cavities & new coupling elements (designed at CERN)Validation will establish IOTs as baseline for LHC (streamline integration)
Reached 60 kW last Friday, limited by the exiting power supplies !
2016: Important decision to adopt IOT as baseline for SPS
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Cavity Supports & Alignment
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VER
TIC
AL1
VER
TIC
AL2
VER
TIC
AL3
Top plate – kinematic mount, option with levelling jacks as vertical supports
Three point alignment which are blocked afterAdditional points for rigidity
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Position monitoring system (BCAM + FSI)• BCAM + FSI (1:1) full system mock-up under construction
• Irradiation campaign of reflective targets and collimators finished
• FSI head prototypes designed and under manufacturing
• BCAM → System performance initially validated on the mock-up. Tests and calibration of camera vacuum viewports pending
• Cryogenic tests of reflective targets planned in the next 2 months
• Fiducialisation of the helium tank mock-up on CMM and laboratory verification of full system performance
• FSI head test in operation conditions (vacuum, reflector at 4K)
• Irradiation campaign of FSI heads assemblies
• SM18, SPS - DAQ and data processing software development
• Measurements in SM18 – validation of the final system
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Warm Magnetic Shield
• Field measured in SPS and applied
to Warm Magnetic Shield
• Gaps between plates induces field
leaks, fine tuning
Top plate
Peak B ≤ 5 𝜇𝑇 @extremeties
Results with optimal proposed design
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CM Thermal Shields
• After several studies, Cu
chosen as baseline
• Connection between cooling
pipe and plates under study
• Design & integration finishing
Result Summary
Pipe Temperature Pipe Convection
Tmin (K) Tmax (K) Tmin (K) Tmax (K)
Al/SSPanels 64 81 70 87
Pipe 50 105 50 139
CuPanels 53 75 55 84
Pipe 50 70 50 75
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Vacuum Vessel
• Trapezoidal design for assembly (adopted from Triumph)
• Stainless steel with Al lateral windows (max access)
• Deformation on top must be limited to mitigate misalignments
• Deformation to be limited for vacuum integrity
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SM18 Clean Room & CM Assembly
CM Vertically mounted on Top Plate
Clean Room (ISO4) String Assembly
HPR (ISO5)
Compatible with other LHC/ISOLDE/SPL/.. Assemblies
Clean room tooling under study
FPC Testing
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SPS-LSS6 Implantation
Cryo-module
Movable TableQDA 61710
CCInterlocked
valve
Interlocked valve
Interlocked valve
Interlocked valve
VPIA
P P
VGPBVGRB
Roughingvalve
Roughingvalve
Roughingvalve
Roughingvalve
PP
VGPB VGRB VPIA
P P
VGPBVGRB
VPIA
P P
VGPBVGRB
PP
VGPB VGRB
Roughingvalve
TPSG 61773
Multiple Vacuum sectorization to accommodate bypass & module replacement
11.5m overall space, CM installed in a by-pass & motorized transfer table
RF & Cryo on movable table with liquid Helium
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Cryogenics
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• Decision for refrigerator and ancillaries to go underground
• Procurement for cryo-distri, refrigerator & proximity cryogenics launched
SPS tunnel
Helium Cold Liquefaction
Reserved for
Fire detection
Cryo-distribution
(valve boxes & 80m cryoline)Movable Table &
Proximity
Cryogenics
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CM Cryo-Circuits
Cool down circuit
EHs
Normal operation supply line
Return / Pumping collector
Level gauge pipes
Cool down and 2 K normal operation
DQW static HL: 12.5 WRFD static HL: 12 W
DQW dynamic HL: 18.1 WRFD dynamic HL: 15.9 W
Instrumentation portSafety valve
Thermal screen bayonet interfaces
Coaxial double channel interface
Rupture disc
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BA6/SM18 (Surface) Integration
Integration in SM18 bunker and RF power area ongoing
Integration in BA6 area has started
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SPS Test Program Summary• In-situ cryomodule RF commissioning/testing in park position
• RF commissioning with low-intensity beam, 1-12 bunches
• High intensity single bunch up to 4x72 trains
• Long-term behavior of coasting beams in the SPS with 1-bunch
½ -day Meeting in Jan 2016 to discuss potential MDs(ABP, BI, OP, RF & others)
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Compatibility with SPS Operation
• Compatible with slow extraction to Fixed target beam
• Aperture not enough LHC extraction
Cra
b C
avit
ies
LHC beam extractionFixed Target Beam
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Test Program, LLRF
• Long-term behavior of coasting beams
• Validate the calcs/simulations, and mitigation by damper
• The SPS CC emittance growth will be much larger than the final LHC system (noisy LLRF, lower
energy, smaller frev - but smaller bcc) -> probably no need to boost the noise to see an effect …
2 2
( ) ( )2 2
o revo revCC b rev CC A b s rev
n nb b
eV feV fdS f n f S f f n f
dt E E
b b
• Calculated and simulated transverse emittance growth vs. CC RF phase noise (left)• Goal is to derive the exact specification for the LHC
33%/hr in LHC
1.6%/hr in LHC
See Talk: T. Mastoridis
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Summary
• Intense & exciting 2015-16
• Highly motivated team, but no shortage of crisis meetings
• Keeps us on our toes
• In approx. 1-yr we should be in final assembly phase & in 2-yrs
in the SPS
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Qtr 1, 2016 Qtr 3, 2016 Qtr 1, 2017 Qtr 3, 2017
Cavity 1 manufacturing (DQW)
HOM couplers manufacturing (DQW)Assembly outside clean room
Asse
mb
ly in cle
an ro
om
Cavity 2 manufacturing, processing & cold tests (DQW)
Vacuum vessel design for manufacturing
1st Cryomodule ready for cold test in SM18 (November 2017)
Contingency
Helium vessel design for manufacturing (DQW)
Helium vessel parts manufacturing (DQW)
Helium vessel prototype (DQW)
Vacuum vessel production
Thermal shield design for manufacturing Thermal shield manufacturing
Assembly tooling design for manufacturing Assembly tooling manufacturing
Magnetic shield design for manufacturing Warm magnetic shieldmanufacturing
Cold magnetic shield manufacturing (DQW)
RF lines manufacturingRF lines design update and prototyping (DQW)
Tuner prototype tests (DQW) Tuning manufacturingTuner design optimization
FPC manufacturing
Components for monitoring the alignment
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CERN Plans for SPS-CM
today
1.5 months
Tuner proto design
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Revised Plan, LHC Series
20242017 2018 2019 2020 2021 2022 2023
LHC Cryomodules Production
CryoModule 1
CryoModule 2
CryoModule 3
CryoModule 4
CryoModule 5
CryoModule 6
CryoModule 7
CryoModule 8
Inst
alla
tio
n in
LH
C
Run 2 Run 3
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Revised Plan, LHC Series
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Welding tests, HOMs
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- W050: Niobium thickness 2mm. Welding from external side
- W010: Niobium thickness 3.6 & 4.2mm. Welding from external side
External side
FE
FE Internal Side
A/B Samples for testing
External Side
Sample for testing
• Welding parameters for both welds: OK• Visual inspection according to ISO 13919-2 level B• Qualification according to EN-15613: Metallographic and Hardness Test