The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
Chamonix Summary of Session 6 on the
HL-LHC upgradeOrganized by O. Brüning and Paolo Ferracin
together with all the speakers
Summary of Session 6 on the HL-LHC
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Session Overview:• The Session featured 6 presentations with 20min presentation and 10
min of discussion for each presentation:
• HL-LHC Parameter and Lay-out Baseline Paolo Fessia
• HL-LHC Magnet Roadmap Ezio Todesco
• HL-LHC RF Roadmap Rama Calaga
• HL-LHC alternative scenarios, parameters and lay-out Rogelio Tomas
• Collimation and MP Roadmap Stefano Redaelli
• Down Selection Criteria and MDs Prior to LS3 Gianluigi Arduini
Summary of Session 6 on the HL-LHC
Equipment on the Beam Tunnel equipment Vert. J Surface Eq. Dis.
DF(X-M) + SC Link DSH (X-M)
Cryo line
Alignment
QPS2
Magnet systemMQXFA MQXFB, MBXF, MBRD, MQYY,
Q5 1.9, Q6 1.9MCBXFB, MCBXFA, MQSXF, MCTXF, MCTSXF,
MCDXF, MCDSXF, MCOXF, MCOSXF, MCSXF,MCSSXF,MCBRD, MCBYY
Beam vacuum
TAXS, TAXN
Interaction Region and MS IP 1,5
Collimation (TCTPM, TCL, TCLM, TCTP)
Beam diagnosticBPMSQW, BMPSQ, BPMSQT, BMLC
DS Collimation for ion IP 2
H.F. dipoles
Cryo-bypass+TCLD
DFH(X-M) + Power converters
EE
Crab Cavity cryomodules
RF systemLoads, circulators, RF power, LLRF, HVPS,
central LLRR
DS Collimation pp (TBC RUN II) IP 1,5
H.F. dipoles
Cryo-bypass+TCLD
DS Collimation pp (TBC RUN II) IP 7
H.F. dipoles
Cryo-bypass+TCLD
Rad-hard electronics for BLM and BPM
CC diagnostic and protectionPIC
BIS
DFA+ SC Link DSHA
DFHA + Power converters
SC link/Powering
arcIP 1,5
Cryoplant IP 1,5
CB Warm compressor and other surface eq.
SC link/powering IP 7
Hor. SC L. DSH + DFA
Power converters
New DSLM for Q6
Summary of Session 6 on the HL-LHC
Talk 1: Paolo Fessia
CS Baseline collection completedeach system/equipment with Conceptual Spec, presently 90 document recorded
4Courtesy of I. Bejar Alonso, S. Chemli Summary of Session 6 on the HL-LHC
Talk 1: Paolo Fessia
E. Todesco HL LHC magnets roadmap - 5
LAY OUT
Last bits being frozen (correctors for D2 Q4)
20 40 60 80 100 120 140 160 180distance to IP (m)
Q1 Q3Q2 D1
Q: 200 T/mMCBX: 3.3 T 1.5 T mD1: 1.8 T 26 T m
DFB
D2 Q4
2008
2022
Summary of Session 6 on the HL-LHC
Talk 2: Ezio Todesco
E. Todesco WP3 status - 6
CONTENTS: HL-LHC IR MAGNETS
Triplet QXF (LARP and CERN) Separation dipole D1 (KEK)
Recombination dipole D2 (INFN design)
Q4 (CEA)
Skew corrector (INFN)
Corrector sextupole (INFN)
Corrector dodecapole (INFN)
Corrector octupole (INFN)
Corrector decapole (INFN)
Orbit corrector (CIEMAT)
Cross-sections in scaleSummary of Session 6 on the HL-LHC
Talk 2: Ezio Todesco
E. Todesco HL LHC magnets roadmap - 7
11 TESLA: IDEA
Idea: replace a 8.3 T Nb-Ti dipole with 11 T Nb3Sn dipole
This leaves enough space for a 0.8 m long room temperature collimator
One dipole replaced by two 5.5-m-long dipoles plus r.t. collimator
4 units needed for IP2 in LS2 – first Nb3Sn seeing a beam!
8 units needed for IP7 in LS3
Up to 16 more units could be needed at IP5 and IP1 in LS3
Summary of Session 6 on the HL-LHC
Talk 2: Ezio Todesco
[Baseline program of WP5 for Col Upgrade]
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[Studies for ‘Option 0’ of Crab Kissing scheme ongoing]
Summary of Session 6 on the HL-LHC
Talk 3: Rama Calaga
Required for longit. bunch shaping
9Summary of Session 6 on the HL-LHC
Talk 4: Rogelio Tomas
10Summary of Session 6 on the HL-LHC
Talk 4: Rogelio Tomas
11Summary of Session 6 on the HL-LHC
Talk 5: Stefano Redaelli
MoGraphite
DS Collimators
E-lens & altern
12Summary of Session 6 on the HL-LHC
Talk 5: Stefano Redaelli
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Nominal Scenario: Areas for MD studies during RunII• Some of the challenges:
• Low b* optics with well behaved chromatic properties
• Electron cloud effects with 25 ns beams
• Large crossing angle and Crab Crossing to minimize the geometric reduction factor and pile-up density (SPS tests)
• b* levelling
• Large beam-beam tune spreads
• Beam Halo Measurement and Control particularly to cope with possible crab cavities failure scenarios.
• Stability and Minimization of impedance
Collide & Squeeze Dynamic Aperture Flat Optics
Summary of Session 6 on the HL-LHC
Talk 6: Gianluigi Arduini
14Summary of Session 6 on the HL-LHC
Main Points from the Q&A sessions:• It is important to quantify the required availability and efficiency for reaching HL-
LHC performance and to check these for all LHC systems (high reliability machine!)
• Stochastic Cooling (for Ion operation) is not in the HL-LHC Baseline
• Need for prioritization of MS upgrades not yet in the baseline (e.g. new Q5 in IR1 & 5) and identification of resulting performance limitations.
• Need for clarification of ‘ultimate’ HL-LHC performance.
• Issue of small series production and risk mitigation (multiple producers).
• Need for clarification of spare RF components for new HL-LHC equipment.
• Interplay of 200MHz LH RF system and 400MHz Crab-Cavities (non-linearity).
• Are there plans for testing Crab Cavities in the LHC after the SPS tests and before HL-LHC? Have been looked at at IP4 but would have impact on schedule!
• Preferred luminosity levelling method dynamic low-beta and NOT Crab cavities
The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
15Summary of Session 6 on the HL-LHC
