FP7 High Luminosity Large Hadron Collider Design Study...

CERN-ACC-2014-0069

HiLumi LHCFP7 High Luminosity Large Hadron Collider Design Study

Milestone Report

Database of Baseline Scenarios andVariants

Fartoukh, S (CERN) et al

18 June 2014

The HiLumi LHC Design Study is included in the High Luminosity LHC project and ispartly funded by the European Commission within the Framework Programme 7

Capacities Specific Programme, Grant Agreement 284404.

This work is part of HiLumi LHC Work Package 1: Project Management & TechnicalCoordination.

The electronic version of this HiLumi LHC Publication is available via the HiLumi LHC web site or on the CERN Document Server at the following URL:

CERN-ACC-2014-0069

http://hilumilhc.web.cern.chhttp://cds.cern.ch/search?p=CERN-ACC-2014-0069

Grant Agreement No: 284404

HILUMI LHC FP7 High Luminosity Large Hadron Coll ider Design Study

Seventh Framework Programme, Capac i t ies Spec i f ic Programme, Research Inf rast ructures, Col laborat ive Pro ject , Des ign Study

MILESTONE REPORT

DATABASE OF BASELINE SCENARIOS AND VARIANTS

MILESTONE: MS17

Document identifier: HILUMILHC-Mil-MS17

Due date of deliverable: End of Month 30 (April 2014)

Report release date: 18/06/2014

Work package: WP1: Project Management and Technical Coordination

Lead beneficiary: CERN

Document status: Final

Abstract:

A proposal addressing the configuration management for HL-LHC in perspective of merging it in the future with the system already in place for the LHC has been made by the team responsible for the Layout Database [1]. While mainly the approved baseline will be implemented in the Layout Database, a number of optics versions have been developed and studied during the initial phase of the project, of which an overview is provided in this document.

Grant Agreement 284404 PUBLIC 1 / 11


Doc. Identifier: HILUMILHC-Mil-MS17

Date: 18/06/2014

Copyright notice: Copyright © HiLumi LHC Consortium, 2012. For more information on HiLumi LHC, its partners and contributors please see www.cern.ch/HiLumiLHC 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. HiLumi LHC began in November 2011 and will run for 4 years. The information herein only reflects the views of its authors and not those of the European Commission and no warranty expressed or implied is made with regard to such information or its use.

Delivery Slip

Name Partner Date

Authored by S. Fartoukh and R. De Maria CERN 24/05/2014

Edited by M. Zerlauth CERN 13/06/2014

Reviewed by O. Bruning and Lucio Rossi CERN 10/06/2014

Approved by Steering Committee 17/06/2014


http://www.cern.ch/HiLumiLHC



Date: 18/06/2014

TABLE OF CONTENTS

1. INTRODUCTION ......................................................................................................................................... 4

2. OPTICS VERSIONS ..................................................................................................................................... 4

3. FUTURE PLANS / CONCLUSION / RELATION TO HL-LHC WORK ............................................... 8

REFERENCES ...................................................................................................................................................... 9




Date: 18/06/2014

Executive summary A baseline for the optics and layout of the high luminosity insertions has been established and agreed between all WP holders over the past year. A first detailed layout for the insertion left of the CMS experiment based on the baseline HL-LHC optics HLLHCV1.0 [2] will be presented in the Parameter and Layout Committee end of June. An overview of the various optics versions is given along with an outlook on the main features of the updated version of the baseline optics HLLHCV1.1, about to be released in the coming months.

1. INTRODUCTION Since the start of the HL-LHC project the baseline layout and optics has been in constant evolution, leading to the currently approved baseline optics HLLHCV1.0 [2]. The optics and layouts versions evolved from options proposed for the so called Phase I project ([3],[4],[5]), the development of the ATS scheme [6],[7],[8],[9],[10],[11],[12],[13],[14],[15],[16] to more and more realistic implementations by incorporating the hardware specifications being developed by the other work packages (for instance [17] and reference therein).

2. OPTICS VERSIONS Table 1 provides an overview of the optics versions presented in the official optics database [18]. All layout versions are based on the nominal optics version V6.503 file and sequence editors are provided to replace and introduce upgraded and or new beam line elements. Complete strength files are available for all optics configurations. Naming conventions vary between optics versions following the evolution of the new hardware. A rich set of tools used to build ATS optics and perform specific simulations is also provided, e.g. for mechanical aperture calculation, analysis of chromatic properties, field error modelling and dynamic aperture calculation, studies of beam-beam effects, and analysis of the optics transition from injection to collision (for some of the versions).

Table 1: HL-LHC Baseline Optics and Variants currently under study

SLHCV2.0 Optics and layout proposed for Phase I LHC upgrade based on NbTi 123T/m 120mm triplets [3][4][5], new TAS and D1 but constant matching section (D2/Q4/Q5)

SLHCV3.0 ATS proof of principle based on Phase I triplets [6][19][20] and first magnet aperture specification to reach low beta* with new matching section

SLHCV3.01 Same as 3.0 but optimized for dynamic aperture thanks to an additional main sextupole in Q10 in IR1 and IR5 [6][20].

SLHCV3.1a ATS optics based on 100T/m NbTi triplets and displacement of D2 for crab cavity integration [21][22].

SLHCV3.1b ATS optics based on 150T/m Nb3Sn triplets and displacement of D2 for crab cavity integration. [21][22][23][24].




Date: 18/06/2014

HLLHCV1.0 As SLHCV3.1b with new triplet layout based on 140T/m Nb3Sn triplets [2]. HLLHCV1.1 In preparation, as HLLHCV1.0 with input from WP3 for a realistic design of

D2, energy deposition studies for the passive protection of the superconducting elements, hardware integration studies and updated naming conventions [32][33]

Table 2 provides additional details of the above mentions versions emerging from this design process.




Date: 18/06/2014

Table 2: Main variations HL-LHC Optics Variants currently under study. The baseline collision optics corresponds to a beta* of 15 cm in both transverse planes (round optics) with a full crossing angle of 590 µrad (but other collision optics are available, round or flat, for dedicated studies)

SLHC V2.0 SLHC V3.0 SLHC V3.01

SLHC V3.1a SLHC V3.1b HLLHCV1.0 (Baseline)

HLLHCV1.1 (to be released)

Collision β* IP1,5

round: 30 cm, (40 cm)

flat: 30/7.5 cm with HV,VH, HH, VV crossings round: 30 cm, 15 cm;

round: 19 cm, (15 cm);

Round: 15cm (10 cm, 33 cm, 40 cm) flat: 30/7.5cm, (20/5 cm) with HV, VH crossing.

round: 15cm, (10 cm) flat: 30/7.5cm, (20/5 cm) with HV, VH crossing transition strengths

to be released

Pre-squeeze β* IP1, 5

60 cm 50 cm 40 cm, (2 m) 44 cm, (3 m) transition strengths

44 cm

Injection β* IP1, 5

14 m 5.5 m, (11 m) 5.5 m, (11 m) 6 m, (11 m, 18 m) 6 m

Triplet Gradient 123 T/m; lengths Q1-Q3 9.145m, Q2 7.735m

Gradient 100T/m, lengths Q1-Q3 10.614m, Q2 8.710m

Gradient 150T/m, lengths Q1-Q3 10.614m, Q2 8.710m

Gradient 140 T/m, lengths Q1-Q3 4.002m*2, Q2 6.792m

Gradient 140 T/m, lengths Q1-Q3 4.00m*2, Q2 6.8m

Triplet corrector package

Nested triplet nonlinear corrector package (new a5/b5/a6 corrector coils as of SLHCV3.1b)

Superferric triplet nonlinear corrector package.

Insertion region dipoles

New D1 New D2 D2 moved towards the IP by 15m – for version HLLHCV1.1 the magnetic length of D1 [29] and D2 has been shortened.




Date: 18/06/2014

Insertion region quadrupoles

MQYY type for Q4 in IR1,5 MQYL type for Q5 in IR1,5 Double MQY for Q5 in IR6

MQYY type for Q4 in IR1,5 MQYL type for Q5 in IR1,5,6 Additional sextupole in Q10 IR1 and IR5

Q5 moved towards the arc by 14m MQYY type for Q4 in IR1,5 MQYL type for Q5 in IR1,5,6 Additional MS in Q10 of IR1 and IR5

Q5 moved towards the arc by 11m, MQYY type for Q4 in IR1,5; MQYL type for Q5 in IR1,5,6;Additional MS in Q10 of IR1 and IR5

Q5 moved towards the arc by 11m MQYY type for Q4 in IR1,5 MQYL type for Q5 in IR1,5,6 Additional MS in Q10 of IR1 and IR5

Q4 moved towards the arc by 8m Q5 moved towards the arc by 11m MQYY type for Q4 in IR1,5 MQY at 1.9K type for Q5 in IR1,5 Additional MS in Q10 of IR1 and IR5 Double MQY for Q5 in IR6

Crab cavities 2 Crab Cavities 3 Crab cavities 3 Crab cavities 4 Crab cavities




Date: 18/06/2014

In addition other options have been studied based on triplet layouts using 120 T/m and 170 T/m gradients [25][26], with the layout using an additional Q7 for crab cavity kick enhancements [27], without upgrading the matching section layout [28]. Possible intermediate scenarios for the injector and LHC beam parameters have been studied and presented at the Review of LHC and Injector Upgrade Plans Workshop (RLIUP) [34]. The optics variants are presently available through the referenced authors.

3. FUTURE PLANS / CONCLUSION / RELATION TO HL-LHC WORK Emphasis on future work is the further evolution of the baseline, including variants featuring the new crab-cavity baseline and additional details on the powering scheme [30] [37], together with the possible implementation of the novel so-called crab-kissing (CK) scheme for mitigating the line density of pile up events [35,36]. Although the crab-cavities are and remain a keystone of the HL-LHC project, further re-motivated by their direct connection with the pile-up density via the CK scheme, it is worth mentioning the so-called HL-LHC Plan B [35] at constant pile-up density but slightly reduced performance (see Fig. 1): without crab-cavity but flat optics (50/10 cm beta* compared to 15/15 cm for the baseline) and relying on a small crossing angle of about 300 µrad (compared to 590 µrad for the baseline) thanks to a Long Range Beam Beam Wire compensator (LLRB) in the high luminosity insertions [30][31]. It is important to note however that at the moment of writing the LLRB still requires an approval of the hardware before eventually integrating the HL-LHC baseline.

Fig. 1: Estimate for the yearly performance [1/fb] of the HL-LHC as a function of the virtual luminosity [E34] for two possible bunch charges (1.9E11 or 2.2 E11 protons per bunch in dotted and solid lines respectively) and two possible values for the maximum allowed instantaneous luminosity. A few possible HL-LHC configurations corresponding to a given




Date: 18/06/2014

virtual luminosity are indicated on the horizontal scale, in particular the baseline with round optics and crab-cavity, and instead the Plan B with flat optics and beam-beam wire compensators. In parallel, work is progressing to reflect the baseline optics in the configuration management for HL-LHC, which will be largely based on the Layout Database already in place for the LHC [1]. As this service will have to handle several machines & layouts in parallel, e.g. the implementation of configurations with round and flat beam operation, aspects like consistent naming, parameters, layout drawings, and functional positions and slot assignments need to be considered from the start along with the optics studies in order to allow for a smooth integration consistent with all layout and optics variants. A first version of the Layout of the insertion region around the CMS experiment is currently being finalized within the Layout Database services.

REFERENCES [1] S. Chemli (2013), EDMS structure for parameters & layouts of current LHC project and proposal for HL-LHC, 4th HL-PLC meeting, Slides & Minutes, 2014. [2] R. De Maria, S. Fartoukh, A. Bogomyagkov, M. Korostelev. HLLHCV1.0: HL-LHC Layout and Optics Models for 150 mm Nb3Sn Triplets and Local Crab-cavities. IPAC'13 Proceedings. [3] S. Fartoukh, Optics Challenges and Solutions for the LHC Insertion Upgrade Phase I, in Chamonix 2010 Workshop on LHC Performance, Chamonix, France, 25 - 29 Jan 2010, pp.262-290, CERN-sLHC-PROJECT-Report-0038. [4] S. Fartoukh. Layout and Optics Solution for the LHC Insertion Upgrade Phase I, IPAC10 Proceedings. [5] S. Fartoukh, R. Tomás, J. Miles. Specification of the closed orbit corrector magnets for the new LHC inner triplet, CERN-sLHC-PROJECT-Report-0030, 2009. [6] S. Fartoukh. Towards the LHC Upgrade using the LHC well-characterized technology, CERN-sLHC-PROJECT-Report-0049, 2010. [7] S. Fartoukh. Breaching the Phase I optics limitations for the HL-LHC, in Chamonix 2011 Workshop on LHC Performance, Chamonix, France, 24 - 28 Jan 2011, pp.302-316. [8] S. Fartoukh. Breaching the Phase I Optics Limitations for the HL-LHC, CERN-sLHC-PROJECT-Report-0053, 2011. [9] S. Fartoukh. An Achromatic Telescopic Squeezing (ATS) Scheme For The LHC Upgrade, IPAC11 Proceedings. [10] S. Fartoukh, B. Goddard, W. Höfle, M. Lamont, R. De Maria, R. Miyamoto, G. Müller, L. Ponce, S. Redaelli, R. Steinhagen, M. Strzelczyk, R. Tomás, G. Vanbavinckhove, J. Wenninger. The Achromatic Telescopic Squeezing Scheme: Basic Principles and First Demonstration at the LHC, IPAC12 Proceedings. [11] S. Fartoukh. Achromatic telescopic squeezing scheme and application to the LHC and its luminosity upgrade, CERN-ACC-2013-0289, 2013 Published in: Phys. Rev. Spec. Top. Accel. Beams 16 (2013) 111002APS. [12] S. Fartoukh, G. Vanbavinckhove, M. C. Alabau Pons, R. Alemany Fernandez, R. Assmann, A. Butterworth, M. Giovannozzi, B. Goddard, P. Hagen, W. Höfle, D. Jacquet,


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R. De Maria, R. Miyamoto, G. Müller, S. Redaelli, R. Steinhagen, M. Strzelczyk, R. Suykerbuyk, E. Todesco, R. Tomás, W. Venturini, J. Wenninger, F. Zimmermann. The Achromatic Telescopic Squeezing (ATS) MD part I, CERN-ATS-Note-2011-033 MD, 2011. [13] S. Fartoukh, M. Lamont, R. De Maria, R. Miyamoto, G. Müller, L. Ponce, S. Redaelli, M. Strzelczyk, R. Tomás, G. Vanbavinckhove, J. Wenninger, M. Albert, R. Giachino, M. Giovannozzi, B. Goddard, P. Hagen, W. Höfle, V. Kain, A. Macpherson, L. Normann, G. Papotti, R. Steinhagen, D. Valuch, D. Wollman. The Achromatic Telescopic Squeezing (ATS) MD part II, CERN-ATS-Note-2011-060 MD, 2011. [14] S. Fartoukh, R. Tomás, B. Goddard, W. Höfle, D. Jacquet, G. Kruk, M. Lamont, R. De Maria, R. Miyamoto, G. Müller, M. Pojer, L. Ponce, S. Redaelli, N. Ryckx, R. Steinhagen, M. Strzelczyk, G. Vanbavinckhove, J. Wenninger. The Achromatic Telescopic Squeezing (ATS) MD part III, CERN-ATS-Note-2011-132 MD, 2011. [15] S. Fartoukh, V. Kain, Y. Levinsen, E. Maclean, R. de Maria, T. Persson, M. Pojer, L. Ponce, P. Skowronski, M. Solfaroli, R. Tomás, J. Wenninger. The 10 cm beta* ATS MD, CERN-ATS-Note-2013-004 MD, 2013. [16] S. Fartoukh. First demonstration with beam of the Achromatic Telescopic Squeezing (ATS) scheme, in Chamonix 2012 Workshop on LHC Performance, Chamonix, France, 6 - 10 Feb 2012, pp.128-134. [17] E. Todesco, H. Allain, G. Ambrosio, G. Arduini, F. Cerutti, R. De Maria, L. Esposito, S. Fartoukh, P. Ferracin, H. Felice, et al. A First Baseline for the Magnets in the High Luminosity LHC Insertion Regions, CERN-ACC-2014-0036, 2014. [18] O. Berrig, R. De Maria, S. Fartoukh, M. Giovannozzi, T. Risselada, LHC baseline optics repository, /afs/cern.ch/eng/lhc/optics and http://lhc-optics.web.cern.ch/lhc-optics/. [19] R. De Maria, S. Fartoukh. A Proposal for the Optics and Layout of the HL-LHC with Crab Cavities, IPAC11 Proceedings. [20] R. De Maria, S. Fartoukh. SLHCV3.0: layout, optics and long term stability, CERN-sLHC-PROJECT-Report-0050, 2010. [21] S. Fartoukh, R. De Maria. Optics and Layout Solutions for HL-LHC with Large Aperture Nb3Sn and Nb-Ti Inner Triplets, IPAC12 Proceedings. [22] R. De Maria, S. Fartoukh. Optics and layout for the HL-LHC upgrade project with a local crab cavity scheme, CERN-sLHC-PROJECT-Report-0055, 2011. [23] M. Giovannozzi, S. Fartoukh, R. De Maria. Specification of a System of Correctors for the Triplets and Separation Dipoles of the LHC Upgrade. IPAC'13 Proceedings. [24] M. Korostelev, A. Wolski, R. De Maria, S. Fartoukh. Optics Transition between Injection and Collision Optics for the HL-LHC Upgrade Project, IPAC13 Proceedings. [25] R. De Maria. Parametric Study of Optics Options for the HL-LHC Project, IPAC12 Proceedings. [26] B.J. Holzer, R. De Maria, S. Fartoukh, A. Chancé, B. Dalena, J. Payet, A. Bogomyagkov, R. B. Appleby, S. Kelly, M. B. Thomas, L. Thompson, M. Korostelev, K. M. Hock, A. Wolski, C. Milardi, A. Faus-Golfe, J. Resta Lopez. Optics Design and Lattice Optimisation for the HL-LHC, IPAC13 Proceedings. [27] B. Dalena, J. Payet and A. Chancé, R. De Maria, S. Fartoukh. High Luminosity LHC matching section layout vs crab cavity voltage, IPAC13 Proceedings.


http://lhc-optics.web.cern.ch/lhc-optics/



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[28] M. Fitterer, R. Bruce, R. De Maria, S. Fartoukh. Optics Considerations for PIC and US1 scenarios for HL-LHC in the framework of the RLIUP review, CERN-ACC-NOTE-2014-0031, 2014. [29] E.Todesco et al, 8th HL-LHC PLC meeting, https://indico.cern.ch/event/297333/ [30] R.Steinhagen et al, 7th HL-LHC PLC meeting, https://indico.cern.ch/event/281880/ [31] A. Valishev, S.Fartoukh, D.Shatilov, “BBLR compensation for HL-LHC”, 3rd Joint HiLumi LHC– 22nd LARP Collaboration Meeting May 7-8, 2014, BNL, USA, https://indico.bnl.gov/conferenceDisplay.py?confId=730 [32] R. Calaga, R. De Maria et al, 9th HL-LHC PLC meeting, https://indico.cern.ch/event/315418/ [33] M. Giovannozzi et al., “Optics and Layout Update”, 3rd Joint HiLumi LHC– 22nd LARP Collaboration Meeting May 7-8, 2014, BNL, USA, https://indico.bnl.gov/conferenceDisplay.py?confId=730 [34] Review of LHC and Injector Upgrade Plans Workshop (RLIUP), 29-31 October 2013 – Archamps (France), https://indico.cern.ch/event/260492/ [35] S. Fartoukh, Pile up density at HL-LHC with new shaping and leveling techniques, ECFA High Luminosity LHC Experiment Workshop, 1-3 October 2013, Aix-Les-Bains, http://indico.cern.ch/conferenceOtherViews.py?view=standard&confId=252045. [36] S. Fartoukh, The crab-kissing scheme: concept and motivations, Presentation at LHC- CC13 workshop, CERN, 10 December 2013. http://indico.cern.ch/conferenceOtherViews.py?confId=269322&view=standard [37] A. Ballarino et al, 4th HL-LHC PLC meeting, https://indico.cern.ch/event/239311/


https://indico.cern.ch/event/297333/https://indico.cern.ch/event/281880/https://indico.bnl.gov/conferenceDisplay.py?confId=730https://indico.cern.ch/event/315418/https://indico.bnl.gov/conferenceDisplay.py?confId=730http://indico.cern.ch/conferenceOtherViews.py?view=standard&confId=252045http://indico.cern.ch/conferenceOtherViews.py?confId=269322&view=standardhttps://indico.cern.ch/event/239311/

1. Introduction2. Optics VErsions3. FUTURE PLANS / Conclusion / relation to HL-LHC workReferences

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