HIE-ISOLDE Project Status Report Yacine KADI CERN HIE-ISOLDE Project.
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Transcript of HIE-ISOLDE Project Status Report Yacine KADI CERN HIE-ISOLDE Project.
HIE-ISOLDE ProjectStatus Report
Yacine KADICERN
HIE-ISOLDE Project
2
OUTLINE
Status of the Technical InfrastructureResults from the Machine CommissioningFuture PlansConclusions
HIE-PCG meeting, Y. Kadi, 21 Sep. 2015
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Water station B197
Technical Infrastructure (E. Siesling)
HIE SC Linac
Equipment platform
High Energy Beam Transfer lines
HEBT
Compressor building 198
Cold Box building 199
ISOLDE target zone
ISOLDE Low Energy
Cryo System: fully commissioned. Liquid He made.
Cryogenic Plant
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Cryo Cold Line & all 6 Jumper Boxes: installed and instrumentedPressure tests done on Cold Line.
5
Cryo Distribution Line
HEBT Lines
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MiniBall
Scattering Chamber
Cryo-Module 1 installed on Saturday 2nd May.Cool-down: mid-June to mid-July
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SC Linac
CM1 HW commissioning: main results (W. Venturini)
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Cryogenics: ~100% availability over 2 months, then problems (4 CB stops + incident)
Vacuum: in range of 10-11 mbar Cold alignment: ~1.2 mm vertical offset corrected Cavity conditioning OK, only CAV2 has FE Cavity tuning OK: all cavities at 101.28 MHz, mid range Cavity performance: 6 MV/m/CAV with less than 50 W Serious issue with power coupler identified Solenoid performance: OK, “feature” under control Combined powering cavities and solenoid OK Static heat load measured within specs ( ~ 10 W) LLRF loops working well beyond specs at 2 MV/m
Issues for phase 1: RF coupler
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Observation: RF drifts when driving cavities at high power to initially assumed operational bandwidths thermal effects in the power coupler
Potential showstopper
Actions taken:
• Dedicated test in SM18 permanent damage at 200 W• Post mortem analysis• Second test in SM18 OK after 9 hours at 60 W• Test bench at room temperature: no damage with 500 W
for 1 hour, or 250 W for 24 hours• Third test in SM18 week 36, testing possible fix• Adapting low level RF loops to reduce bandwidth as much
as possible (now 3 Hz 50 W seemed possible)• On Saturday 29th August, CAV4 powered at 14 W
(minimum requirement for operation) for 24 h clear signatures of degradation!
80 W !
Testing possible fix at SM18 (A. Miyazaki)
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Addition of a Thermal Anchor
Coupler with the additional thermal anchor (50W 9h)
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Coupler Powering (A. Miyazaki)
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black: without anchorred: with anchor
Time constant p1 is shorter by factor two with same reflected power
Coupler Cooling (A. Miyazaki)
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black: without anchorred: with anchor
Time constant p1 is shorter by factor seven with same reflected power
Coupler Temperature (A. Miyazaki)
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185
160
135
110
85
60 Cu b
lock
tem
pera
ture
[K]
65
60
55
50
45
40
35
Cu b
lock
tem
pera
ture
[K]
Without Thermal Anchor
With Thermal Anchor
Effect on Eacc (A. Miyazaki)
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black: without anchorred: with anchor
Adapting the LLRF (D. Valuch et al.)
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• On 13/09/2015 all five cavities were successfully powered and locked using an automatic sequence
• Relatively stable operation at 2.5MV/m with 3Hz bandwidth• Field quality in per-cent/degree mode. Worse than the specification, with sufficient
power we can do much better. • rms power limited to ~20W, saturation set to 40W• Coupler gets damaged at 80W for 24 hours.
Adapting the LLRF (D. Valuch et al.)
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Microphonics is the limiting factor for low power operation
Low frequency vibrations (1-5Hz), higher frequency vibration (50Hz) in the cryostat not yet understood
Perturbations are seriously affecting the cavity field – operation at high field (>3MV/m) without tightly locked loops is not possible
Cavity 4 coupler collapsed, but cavity operational at >3Hz bandwidth => Field limitation
Cavity 5 coupler motor is not fully operational – bandwidth can not be set to more than 2Hz
Adapting the LLRF: next steps (D. Valuch et al.)
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Localize the source of vibrations Measure the microphonics in Generator Mode Switch off pumps and other equipment, 10-15 minute cycle time
Deploy new firmware and FESA class to address minor bugs Implement automatic cavity sequence (new FESA class) Start preparing the OP interaction (MachineSetpoint property)
Attempt to lock all cavities at higher than 2.5MV/m (yield 6MV/m): Need to increase the power limit, otherwise not possible. Closely monitor the Forward power for deposited heat
Cryolab Test Set-up (T. Koettig)
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First cool-down is planned for this MondayThe goal is to measure the temperature distribution along the coax cable and coupler antenna first w/o RF powerThen start powering with stepwise increase in RF power until we see a thermal runawayTest set-up will be used also to qualify new RF coupler assembly
HIE ISOLDE roadmap 2015
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w1 w2 w3 w4 w6 w7 w8 w9 w10 w11 w12 w13 w14 w15 w16 w17 w19 w20 w21 w22 w23 w24 w25 w26 w27 w28 w29 w30 w32 w33 w34 w35 w36 w37 w38 w39 w40 w41 w42 w43 w44 w45 w46 w47 w48 w49 w50 w51
CM1 Assembly
CM1 Installation & Test Transport test Installation, warm testsCM commissioning: 11 weeks
XT00 Installation&Tests Powering Survey&Al.
XT001 Installation&Tests PoweringSurvey&Al. Smoothing alignment
XT002 Installation&Tests Survey&Al.Powering Smoothing alignment
Cryogenics Facilities
Machine Checkout Dry runs 2/3 weeks
REX-ISOLDE REX refurbishment and hardware commissioning Powering REX beam commissioning
Beam Commissioning 5/6 weeks
Physics at 4.3 MeV/u 4 weeks Run extension ?
July August September October November DecemberJan-15 February March April May June
Tests related to RF coupler limitations
Possible interleaving
All HEBT hardware commissioned on scheduleCM1 cooled down and hardware tests completeIssue with power coupler looking for an operational pointCryogenics Incident on 12th August
Cryo incident Aug 12th
Overall Summary• Enormous progress since April 2015
• Infrastructure in place• HEBT hardware commissioning completed• CM1 installed, cooled and powered. Full test campaign carried out• REX beam commissioning well advanced • Beam commissioning of SC Linac is possible in September
• The results of hardware tests (problem on RF couplers) highlighted that CM1 is not fully qualified for sustained operation as planned
• Agree with Collaboration on a common scope for 2015 Physics run
Thank you for your attention
DBoxes commissioning in
XT00-XT01S. Sadovich (BE/BI)
DB status in XT00 – XT01• FC – Faraday Cup
• SS – Scanning slit
• Coll – Collimator slit
• Stripping foils are not installed
LBD1FC; SS; Coll; SD
SBD1FC; SS;
Coll
SBD2FC; SS;
Coll
SBD3FC; SS;
Coll
SBD4FC; SS;
Coll
SBD5FC; SS; Coll; SD
LBD2FC; SS;
Coll
LBD3FC; SS;
Coll
LBD4FC; SS;
Coll
CM1
Wal
l
Problems:• Short cut (cup - repeller) in FC in SBD1• Leak/Broken SS in SBD5
All instruments inLBD1 SBD1 SBD2 SBD3 SBD4 SBD5are installed and checked with beam (FC)
All instruments inLBD2 LBD3 LBD4are installed and ready to be checked with beam
XT01
XT00
Next steps
• As soon as beam available:• Testing profile measurement in all DBs• Testing emittance measurement option• TOF measurements
• As soon as scheduled:• Change SS in SDB5
• Winter SD:• Repair FC in SDB1
Proposed beam line layout
HIE-ISOLDE Roadmap
I
II
III
Legend:
Existing REX-structures:RFQ, IHS: 20-gap IH-structure, 7GX: 7-gap split-ring cavities, 9GP: 9-gap IH-structure
Beam phaseswk 14/2015 SD 2015/16
SD 2016/17 SD 2016/17
REX