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MDI towards technical design. Lau Gatignon. Very preliminary ! To trigger discussions. MACHINE DETECTOR INTERFACE. Plus others ………. IP Feedback. Beamcal + Lumical. Anti-solenoid. Vacuum. QD0 quadrupoles. Support tubes. +Stabilization + prealignment. CONTENTS. Introduction

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Mdi towards technical design

Very preliminary !

To trigger discussions

Mdi towards technical design


Plus others ………..

IP Feedback





QD0 quadrupoles



+Stabilization + prealignment


  • Introduction

  • QD0 Magnet

  • Stabilization

  • QD0 support & pre-isolation

  • Pre-alignment

  • IP-Feedback

  • Anti-solenoid

  • Instrumentation

  • Vacuum

  • Overall integration

  • Safety

  • Backgrounds

  • Other issues

Mdi towards technical design

R.Stapnes @ ACE meeting 2 February 2011

Mdi members

R.Appleby, A.Apyan, B.Bartalesi, M.Battaglia, E.Bravin, H.Burkhardt, P.N.Burrows, F.Butin, B.Dalena, K.Elsener, A.Gaddi, M.Gastal, L.Gatignon, H.Gerwig, C.Grefe, E.Gschwendtner, M.Guinchard, A.Hervé, A.Jérémie, Th.Lefèvre, L.Linssen, H.Mainaud-Durand, S.Mallows, M.Modena, J.Osborne, Th.Otto, C.Perry, F.Ramos, J.Resta Lopez, A.Sailer, H.Schmickler, D.Schulte, N.Siegrist, J.Snuverink, E.Solodko, R.TomasGarcia, D.Tommasini, R.Veness, J.Vollaire, A.Vorozhtsov, V.Ziemann, F.Zimmermann

Mdi towards technical design

QD0 Magnet

M.Modena, A.Vorozhtsov, A.Bartalesi, E.Solodkoet al

Qd0 magnet
QD0 Magnet

  • Construct and test short prototypeGradient, field quality, vibration modes, radiation hardness, impact of external fields

  • Finalize design, construct and test full length models of QD0 and QF1Gradient, field quality, stability

  • Design and build field measurement device for long and small apertures with required precision

  • Tests some prototype in beam line (ATF2, CERN-NA or other)In collaboration with stabilization team

Mdi towards technical design


QD0 Stabilisation

A.Jeremie et al (LAPP/Annecy)


  • Finalize choice of sensors (relative and absolute) and actuators

  • Analyze vibrational modes of final QD0 magnet and optimize stabilization strategy accordingly

  • Design and validate design of stabilization foot

  • Finalize integration in support tube

  • Simulation and test in realistic environment of stabilization performance

  • Cooperation with other luminosity stabilization systemsincluding data communication with other systems

  • Stabilisation for L* = 6 m solution

Mdi towards technical design

QD0 Support and Pre-isolator

A.Gaddi, H.Gerwig, F.Ramos et al

Qd0 support and pre isolation
QD0 support and pre-isolation

  • Finalize analysis and tests with pre-isolator prototype

  • Based on these results, finalize design of full-scale pre-isolator

  • Finalize design of QD0 support tubes, taking into account constraints from integration

  • Construct and test one pre-isolator + support tube assembly and validate performance

  • Combined test with stabilized QD0

Mdi towards technical design


Pre-alignment (including QD0)

H.Mainaud-Durand et al

Pre alignment

  • Execute agreed work packages with NIKHEFComplete/update CDR chapter accordingly

  • Test and validate rigidity of CAM mover system and demonstrate compatibility with stabilization requirements

  • As a result make full simulation of RASNIK system with realistic light transport channels through detector

  • Validate stretched wire approach for 500 m length

  • Full design of stretched wire system, compatible with integration and push-pull constraints.

Mdi towards technical design


Ph.Burrows, J.RestaLopez et al

Ip feedback
IP Feedback

  • Continue tests and design to optimize latency

  • Optimize feedback algorithms One or two sides, sensitivity to background (using detector MC)

  • Continue full simulations, including other feedback and feed-forward systems and isolation + stabilization

  • Studies of radiation hardness and B-field tolerance

  • Final engineering, taking into account integration constraints

  • Solution for L*= 6 m implementation of QD0

Mdi towards technical design


B.Dalena, A.Bartalesi, A.Sailer, A.Gaddi, H.Gerwig et al

Anti solenoid

  • Complete a realistic designConfirm choice of super-conducting technologyGood main solenoid compensation Take into account effect of permendur on field configuration Minimize deformation of main solenoid field

  • Integration with detector layout and QD0 support

  • Validate that luminosity performance is adequate

  • Coupling of anti-solenoid and main solenoid Protection of QD0 (permendur, permanent magnets)


  • In collaboration with other working groups, arrive at final design and integration of beam instrumentation relevant for the IP

  • This includes the instrumentation for the IP feedback, but also luminosity monitoring in the post-collision line

  • Follow-up of discussions related to polarization

Mdi towards technical design

Vacuum in IR region

R.Veness et al


  • Final design of all vacuum systems involved, including specification of all vacuum tubes/tanks, valves and pumps

  • Calculation of static and dynamic vacuum pressures in BDS, IR and post-collision lines

  • Validate that the impact on beam dynamics and luminosity is acceptable

Mdi towards technical design


H.Gerwig and many others


  • Work out in more detail the L*=6 m backup solution andcompare with L*=3.5 m (luminosity, acceptance, stabilisation, etc)

  • Follow-up evolution of detector designsFor both detectors or eventual new detector designs In particular impact of changes close to beam

  • Together with BDS teams, finalize choice of L*Can one agree on a single L*, which one? If needed, is it possible to have two different L* ?Work out solution with QD0 in the tunnel, first conceptually (1 year?), at a later stage also technically.Compare with L* = 3.5 m.

  • Design and construction of push-pull platforms

  • Optimize time for push-pull operation

  • Detailed integration with civil engineering and services


  • Agree with safety and civil engineering on all general safety aspects in the surface and underground areasFire safety, smoke extraction, ventilation, RP,escape routes, etcetera

  • Finalize RP simulations with final BDS and detector layoutsAre detectors self-shielding enough? Shielding cavern-garage, ... RP implications (if any) of muon backgrounds from BDS Evaluation of all accident scenarios. Requirements for MPS

  • Design shielding accordinglyEvaluate whether big shielding doors are necessary. Thickness?

  • Cryogenic safety issues


  • Collaborate with BDS, Post-collision line and LCD to evaluate and minimize backgrounds from machine, dumps and IP

  • Evaluate, together with BDS, the impact of muons and their cleaning on the IR in terms of RP safety and backgrounds

  • Confirm that Beamcal ad Lumical are sufficient to serve as masks against neutrons from the various dumps

  • Finalize integration of post-collision line in IR

Other issues
Other issues

  • Continue to coordinate between different working groupsMagnets, stabilization, post-collision line + dumps, BDS, LCD, CES

  • Establish link between detectors and CES group for specification of all services and their integration

  • Work towards full and more precise cost estimate

  • Provide relevant chapters in Project Preparation Plan

  • Prepare first version of Safety File

Stabilization 2
Stabilization (2)

In particular (Annecy groups):

  • Collaboration model

  • Continue characterization of vibration environment (correlations)

  • Continued sensor studies, in particular capacitive gauges and chemical sensors

  • Continued actuator studies and control loop optimization

  • Calculations on vibration modes of QD0 and support structures and combine those with pre-isolator and feedback loops in overall simulations

  • Contribute to integration with other IR equipment, supports, controls, etc (CERN responsibility)

  • Tolerance studies with respect to external magnetic fields and radiation

  • Construction of full prototype with test in real life (ATF2 or lab?)

  • Liaison with MDI and stabilization working groups. Documentation