Baseline Configuration Document

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Baseline Configuration Document

    11 Instrumentation and Controls Introduction

    The Instrumentation and Controls BCD document consists of thirteen sections, in addition to

    this introduction, as listed here:

11.1 Controls Standard Architecture

    11.2 Timing System

    11.3 Diagnostic Interlock Layer

    11.4 Global Network

    11.5 Machine Protection

    11.6 Low level RF

    11.7 Feedback

    11.8 Integration with Instrumentation 11.9 Machine Detector Interface

    11.10 Instrumentation Beam position monitors

    11.11 Instrumentation Beam profile monitors (transverse) 11.12 Instrumentation Longitudinal

    11.13 Instrumentation other (intensity, loss, ring)

It is anticipated additional sections will be needed as requirements are more carefully defined

    and understood.

    Author list:

    11.1 Claude Saunders, Andrew Johnson (ANL), Ray Larsen (SLAC), Matthias Clausen


    11.2 Frank Lenkszus (ANL)

    11.3 Ray Larsen (SLAC)

    11.4 Ferdinand Willeke (DESY), Margaret Votava (FNAL) 11.5 Marc Ross (SLAC)

    11.6 Brian Chase (FNAL), Stefan Simrock (DESY) 11.7 John Carwardine (ANL)

    11.8 Manfred Wendt (FNAL), John Carwardine (ANL) 11.9 TBA

    11.10 Steve Smith (SLAC), Hans Braun (DESY) 11.11 Grahame Blair (RHUL) and Marc Ross (SLAC) 11.12 Marc Ross (SLAC)

    11.13 Junji Urukawa (KEK)

    11.14 Controls (to be added)

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11 Instrumentation

    The ILC Instrumentation system functions both to provide diagnostic information to be used to correct substandard operation and as an integral part of the machine control system, providing input to the machine protection system and beam-based feedbacks. There are four types of basic monitors: position (BPM), intensity (toroid), profile and loss (BLM). These are supplemented by a system of special monitors to be 1) jointly used by the accelerator and detector, 2) to monitor other aspects of the beam such as longitudinal profiles and

    correlations, beam timing, damping ring parameters, beam halo, and 3) feedback. The beam

    based instrumentation system is further supplemented by hardware monitors: temperatures, field probes, radiation monitors and etc.

    The instrumentation for the ILC is challenging and much of it, although demonstrated in small test installations, has never been implemented on a large scale. From the point of view of instrumentation, the ILC is divided into two pieces, the „damped beam‟ section (damping

    rings beam dumps), and the injector system (upstream of the damping rings, including injection into the rings). Typical beam sizes and required position monitor resolution in the damped beam systems are around 1 micron. In some cases, these can be much smaller (~0.1 microns). RD is needed to provide confidence in a given system design, especially for the BPM and profile monitor systems.

    The most critical (and most expensive) instrumentation system is the BPM system. Experience at LEP, Tevatron, PEPII, SLC and many synchrotron light sources has shown the importance of having a well engineered, proven BPM system. The first instrumentation section of this chapter deals with BPM requirements and how these will be met, in large part by precision RF cavity BPM‟s. There are 2 parts to the section, one for the injector and damping ring and the other for the downstream systems, linac and beam delivery. The second section describes the second critical system, the damped beam profile monitor system. It is this system that validates the performance of the low emittance transport. For the most part, these monitors will be based on „laser-wires‟. A laser-wire consists of a 90 degree Compton

    scattering chamber where a finely focused, very high power pulsed laser is used to sample the particle beam density. Although laser-wires have been built and successfully tested in all three ILC regions, these systems are still very much in development and require constant handling by experts. It is useful to think of the laserwire system as providing an estimate of the luminosity, if the beams were brought into collision at that point. In that way, laserwires can be used to segment the low emittance transport. In sharp contrast to BPM‟s, laserwires need

    their own section of beamline to function optimally and this has added cost. The beamline length needed depends on the surrounding components (e.g. collimation), typical beam sizes in the area and the expected performance of the laserwires. The fourth instrumentation section describes longitudinal diagnostics. The ILC longitudinal diagnostics will be used to measure the bunch length and the x z, y z and E z correlations. These devices are used to test the damping ring beam dynamics, the bunch compressor phase space rotation, the phase space distortion in the main linac, the wakefield kicks in the collimation system and the effects of poor optical matching and non-linear fields. Because the longitudinal phase space distribution is not expected to be Gaussian and small features in the distribution are important, these devices must have resolving power well beyond the characteristic bunch length scale. It is expected that a relatively small number will be needed, but, as with the laserwires, these BCD v. Dec.12, 2005

devices need dedicated beam line space and hence have cost implications. Finally, the last

    instrumentation section deals with special monitors.

Table 1 summarizes ILC instrumentation requirements.

Monitors for intensity and transverse beam position


    RequirneedILC Required Cost R &D ed Technoled Information componeresolution estimate/Remarks requiremrisetimogy total from nt / precision unit ents e both


     4K Reliabilit

    excluding y; Injector Sigma/5 6MHz Stripline 600 Self vacuum redundan

    hrdwre cy



    band Roll Stability, Damping 20 mrad 4K exc. Snowmass roll under ATF 1 Slow; Button 600 ring precision Hrd. WG3b study pm-rad

    100um. (CCLRC)



    Special for

    ffbk Bunch Ffbk Damping Snowmass fraction spacinButton 20 8K Ffbk RD integratioring WG3b sigma also g n



    wiggler Similar to Damping L_w/sections; 1 µm / ? the rest of ring 2 vacuum DR chamber




    6MHz integral recommenseparalinearity, ded sig/3, te. 10K incl from DS a few at M. Wendt Calibratio10 % cavity 0.5% for sig/10 for Cavity ? GG2 talk n process, Linac increamore if absolute FFBK re-800 WG4/1 analysis (BPM) se in cleaning gain over Nom I. entrant ? common from noise is 200um scales session nBPM from included (needs with I for prev verificatilower. bunch on)




    Ferrite intensity Linac Whole 1% loaded 4 5K self what is (inten) train gap needed

    for 1 BCD v. Dec.12, 2005


    ResonanTest dark Linac 50nA/1ms 1ms t 010 ? Olivier I meas at dark I pulse mode/ TTF

    Single Parasitic Linac/DR 1e-4? 780ps 2 photon bunch counting? Beam Tesla spectromdelivery- Stability 100 nm 36 TDR/Snoweter 1 spectrom200 nm mass WG4 plane eter

    Beam Backgroudelivery-1 µm / StriplineIP nd 4 Tesla TDR IP 100 µm ? feedback influence feedback (ESA)

    8nm to

    100um 3 or 4

    s/10. beam types. Beam Same Cavity 10K „normal‟ size varies Woodley‟s Some delivery as for 500 including Virt IP‟s from table hard all else linac hardest cavity counted? 85nm to ATF2 IP

    1.2mm. nBPM

     Beam phase monitors


    d RequirILC Cost R &D resolutied Technolounits InformatiRemarcomponeestimate/urequiremeon / risetimgy needed on from ks nt nit nts precisioe


    Test Injector Use required Single gun 0.1 deg Cavity 2 20K Self Haimsonot used bunch system n for SHB


    From Damping Single 0.1 deg Cavity 2 10K Self main ring bunch RF

    TightesBunch Single WG1 BC t phase Compress0.01deg Cavity 6 30K bunch spec monitoor r req.

    May be

    integrated Single Part of Linac 0.1 ? in LL-RF, Self TTF, SNS bunch LL-RF no add‟l.



    n IntegratBeam Single overlap 2 ed with 2M$ delivery bunch crab


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    Monitors for transverse profiles


    ILC resolution Required units Cost Information R &D Technology Remarks component / risetime needed estimate/unit from requirements


     Single Wire Injector Sigma/5 30 30K Self bunch scanner

    XSR, ATF Damping 10% Multi-bunch 2 of WG3b XSR RD laserwire, ? 250K performance ring emittance ok each/ring Snowmass needed not quite

    Laserwire Integration Measurement 3sets/side with lattice Bunch of single WG1 10%e for 2 250K/set needed for ATF2 tests Compressor bunch w/o Snowmass stage BC coupling train precision

     Laserwire/ Cryo warm 3 sets/ Question Linac 10%e Same short warm 250K/set section linac 29 needs study

    Laser wire Does not

    include IP area, secondary secondary Beam 2 sets/ WG4 waist 10%e Same 250K/set waists, delivery side Snowmass monitors, extraction extracted line beam

    monitoring Beam


    collimation system


BCD v. Dec.12, 2005

    Monitors for longitudinal profiles


    ed ILC units Cost R &D resolutiRequired InformatcomponeTechnology needeestimate/Remarks requiremeon / risetime ion from nt d unit nts precisi


    Wire Injector;

    scanners and gun,

    LOLA SHB dE Single Gun, system, 30K Could be ~0.01 measuremlinac, e+ /wire & tested at % / s_z ent DR Self collectio300K/LOSLAC/K~ possible entrann, LA EK 100um w/o train ce booster



    Streak Single Damping camera/defleS_z/10 bunch 1per 500K ring s_z ction cavity w/o train

    XSR/visible Damping 0.01% SR 2 350K ring dE

    Laserwire/widE ~ 30K re scanner & Bunch 0.01% /wire & LOLA Compres 2 / s_z ~ 300K/LOsor 30um LA


    compresLinac dE sor dE at 2 0.01% monitors end used at


     Beam Crab delivery system - 2 see correlatiabove ons listing

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Special Monitors

    R &D ILC Require-Technologunits Cost InformatioType Remarks requirecomponent ments y needed estimate/unit n from ments

     1% remote Ion

    handling chamber 100x

    limit 1/10 m less Injector Beam loss 1W/m- + 0.5K sensitive cost

    linearity for PLIC than



    Damping Beam loss Same ring

    Damping Tighter 10x ring - Beam loss neutrons? wiggler

    Bunch Beam loss Same as inj. Compressor

    Linac Beam loss Same as inj. Beam Beam loss Same as inj. delivery

    Beam Calorimetrydelivery - Beam loss ? Collimation

    Beam Luminosity delivery


    delivery Polarisation

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11.1 Control System Architecture

    1. Overview

    The system topology is assumed to be two parallel tunnels with a central control room near the interaction point.

    The baseline configuration (BC) shall use as a reference design existing packaging standards such as VME and VXI, and be similar to the model envisaged for the NLC and Tesla as well as modern machines such as LHC. The software standard will be a 3-tier architecture with established frameworks at each tier. This approach would minimize development effort. However an alternative configuration (AC) is under consideration to develop a new architecture and packaging standard for the ILC, driven by the need for High Availability (HA) design of both hardware and software. This requires R&D evaluation of the technical and operational benefits of a significant HA investment to enhance the capabilities of both hardware and the 3-tier software at every level. HA systems use Intelligent Platform Management diagnostics and control which can also be extended to other electronics systems, including power electronics.

    The BC can draw cost models from the NLC and TESLA models as well as newer machines. The AC requires additional R&D to evaluate and converge on a new incremental cost model with enhanced HA architectural features.

    2. Baseline Configuration

    a. Description

    The baseline design envisions a dual star network model for controls emanating from a central modular computer cluster (Figure 1).

     Figure 1. Control Room Cluster & Dual Serial Networks

    Dual star data links provide branch control to all sector nodes of the various machines (Figure 2).

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     Figure 2. Dual Links, Sector Node Processors, Front End Modules

    The baseline software architecture utilizes a standard 3-tier approach: client tier, services tier, and real-time tier. This approach provides separation of concerns, re-use, load management, change management, and many other benefits. A significant portion of the logic that traditionally used to reside in the client tier is now provided as a service for use by many clients. Services provide a means to coordinate the activities of many applications, and also serve to integrate real-time and relational database data into a seamless API.

    Figure 3. Software Architecture

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