Instrumentation%20and%20Controls%20

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Instrumentation and ControlsGlobal Group 2
Update since Snowmass

• Thursday, December 8, 2005
• Marc Ross (SLAC), for Hans Braun (CERN), Junji
  Urakawa (KEK), convenors.

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GG2 BCD document

• represent place-holders
• not intended to be as complete
• expected to evolve
• not necessarily reflect the status of the
  Baseline Configuration
• Sub-sections
• Controls Standard Architecture, Timing System,
  Diagnostic Interlock Layer, Global Network,
  Machine Protection, Low level RF, Feedback
• Integration with Instrumentation, Machine
  Detector Interface
• Instrumentation BPM, Beam profile monitors,
  Other (intensity, loss, ring)
• GG2 ILC wiki http//www.linearcollider.org/wiki
  /doku.php?idilc_controlsilc_controls_home
• thanks to ANL/FNAL

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BCD editing Who and Status

• John Carwardine, Frank Lenkszus, Claude
  Saunders, Andrew Johnson (ANL)
• Hans Braun (CERN)
• Ferdinand Willeke, Matthias Clausen, Stefan
  Simrock (DESY)
• Brian Chase, Margaret Votava, Manfred Wendt
  (FNAL)
• Junji Urukawa (KEK)
• Grahame Blair (RHUL), Phillip Burrows (QMUL)
• Ray Larsen, Marc Ross, Steve Smith (SLAC)
• Status
• Needs specification review and comment
• Sections missing
• Uneven coverage (chapter to chapter)
• Uneven coverage (need Asian contributors)

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Standard Architecture
Primary Controls BCD/RDR impact

• Key concern Availability (co with GG3)
  controls and electrical (DC/pulsed)
• Availability Workshop Grömitz (12.2005) ?
  Conclusions
• Electronics in the tunnel is untenable when
• 1) it is untested
• 2) the environment is poorly predicted
• ? understanding the above can lead to an informed
  judgment
• disappointing BPM performance universally
  reported
• failures not directly detected ? resolution,
  systematic errors
• (behavior not included in availSim)
• High availability cost can be evaluated
• RD needed
• (usually cost effective)
• Redundancy, rather than up-front gold plating,
  is key
• fix the replacement time (0), rather than the
  lifetime

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ATCA Advanced Telecom Computing Architecture

• Since Snowmass
• Engagement of ATCA developers
• Demonstrations / Vendor meetings / Standard
  evaluation
• evaluation of ILC implementation
• begin active RD
• procurement of starter kits
• ATCA includes micro-ATCA which is appropriate
  for moderate development
• contact with designers of ATCA HA software
• software and hardware
• (ANL, FNAL, DESY, SLAC)

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Machine Protection
Biggest BCD/RDR impact

• 9 section topics ranging from beam dynamics,
  instrumentation, controls, dumps and operation
• BPMs have to work at 1 - for pilot
• How many and what kind of dumps? ? should have
  been a Snowmass-10 Q.
• Linac passive dumps (Alt) ? BCD not consistent
• Informally (not in BCD proposed since Snowmass)
  
• 2 x nominal full
• 1 x 15 MW ½ way undulator charged beam dump
• in the head-on xing, this could(?) be the back of
  the e main
• 6 x ½ MW damping ring and BC/linac entrance
• injector system also need ½ MW class
• this is a multi-10s M Q

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LLRF
Big RD/BCD/RDR impact

• Active since Snowmass
• Centers at DESY, KEK and FNAL with partners at
  SLAC and universities
• Priorities
• interpret specification and distribute
  performance budget
• parse the work effort
• understand TTF performance and collaborate on
  improvements ? are there fundamental problems?
• TTC Technical board discussion
• Americas LLRF coordination ? Nagaitsev (RF
  coordinator, FNAL)
• Meet in January with FNAL engineers

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Beam Position Monitors Resolution / Calibration
Big operational impact

• Systematic errors
• 1) Offsets
• 2) Gain errors
• 3) Roll error (or coupling)
• In a cavity BPM, also coupling between position
  and angle of the trajectory or pitch/yaw of the
  beam
• Combinations of 1-4 will depend on the intensity,
  beam size, bunch length, and position.
• Errors 1-4 can also depend on environmental
  effects temperature, beam intensity history,
  electrical noise, presence of nearby bunches or
  satellite bunches.

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Utility of resolution

• finding sources of instability and related
  failures
• a sort of insurance policy must evaluate
  incremental cost
• development of dither detection and feedback
  techniques
• very useful at LEP / SLC / etc
• improved speed / reduced step size of beam-based
  calibration procedures
• Beam based alignment a poorly named BPM
  offset-finding procedure
• probably most utility of the above 3

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BPM system cost

• resolution is the easiest specification to meet
• depending on the BPM cavity loss-factor (signal
  size), there is a cost threshold as noise figure
  is lowered
• believed to be below 0.5 um in linac
• electronics development costs are more a concern
  than production costs
• mechanical production cost more important
• robust system required.
• RD cost

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Ongoing BPM RD at ATF, TTF, ESA

• proving cavity BPM systems for ATF2, BDS energy
  spectrometer, linac (esp cleanability), TTF
  HOMs
• progress since Snowmass
• TTF HOM BPM system
• Cavity placement BPM system
• full implementation (80 channels)
• installation 11.2005
• expect um performance
• 2K/channel
• ATF2 Cavity BPM undertest now
• ESA Cavity BPM tests begin early 06
• Development of cavity BPM system for FEL
  undulator

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Beam Profile Monitors (laserwire)
possible long insertion

• design of emittance measurement system at BD
  entrance
• Grahame Blair draft ? real design document
• complex interplay between technology, beam
  optics, backgrounds, basic physics(?)
• what are accuracy/precision requirements?
• How much space is needed for a few percent
  system?
• long system recommended discussion needed
• BCD content ?

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Ongoing discussion and RD

• BCD
• 3 sets DR to linac
• 3 sets in the linac (the Euro set 10 20 50)
• 2 sets / BD side (first one high accuracy)
• Cost
• Development of 2m warm insert
• advised
• Large E/d extraction systems (WG2 BCD) ?
• Expect first precision UK laserwire scans at ATF
  next week
• new PETRA / UK system laser
• KEK optical cavity design work
• SNS multi-IP, long laser transport system ?
  working visit early 06
• Meeting January 30, 2006

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PETRA two scan planes
ATF extraction line laser wire IP single scan
dimension
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ILC bunch mechanics

• What are the inter-bunch timing constraints?
• interplay with ILC footprint, controls
  (MPS/timing), and beam dynamics
• post-Snowmass
• Much misunderstanding of basic limitations
• impact of undulator source decision
• impact of DR kicker pulse rise/fall time
  asymmetry
• draft by Heiko Ehrlichmann (DESY) (12.2005)
• presentation in tomorrows parallel session
• special invitation to hear this critical topic
  detailed

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conclusions
Heikos conclusion slide

• if the overall kicker pulse length can be small
• and a high flexibility in operation parameter
  choice is required
• gt long damping rings with equal circumference,
  every bucket filled
• taking into account all strong geometry
  restriction
• if the kicker pulse fall time is expected to be
  long
• gt gaps for the kicker pulse needs
• taking into account the reduced flexibility
• HF frequency changes during the damping times
  could be used for shifting bunch patters between
  two LINAC pulses, but are not able to relax the
  flexibility or geometry restrictions

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Controls RD testing and paradigm creation
Summary

• Evaluate industrial HA architecture standards
  for applicability to ILC electronics systems,
  subsystems, hardware, and software.
• Demonstrate proof-of-principle HA conceptual
  designs of control system backbone and
  representative control system applications.
• Demonstrate Diagnostics Interlock Layer prototype
  hardware, software, interface to control system.
• Demonstrate timing and rf master oscillator
  distribution system performance (dominated by BC
  requirements)
• Adopt appropriate facility-wide hardware and
  software standards for controls, instrumentation,
  and subsystem interfaces.

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Between Controls and Instrumentation
Feedback/forward RD
Summary

• built in to the layout
• feedforward performance not demonstrated
• what is needed?
• feedforward under test at ATF (QMUL)
• fast feedback
• under test at ATF
• system planning DESY (XFEL) (SLS - PSI)
• BPM-in-noise test at ESA
• important for IP deflection feedback BPMs

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Instrumentation RD
Summary

• Test facility usage
• instrumentation a large part dominant test-beam
  use
• define expectations
• develop international working level partnerships
• ATF, TTF, ESA, A0, Other (smaller, proposed)
• there are only 2 large pulsed SCRF machines TTF
  SNS RD usage requests disappointingly low in
  both cases
• we must take advantage of opportunities these
  large SCRF systems provide!
• existing machines

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GG2 meetings
Communication is key

• weekly (started 10.2005) EU/AM adjusted
• presentations from outside ILC
• SLS, CERN
• Draft agenda (the whole year!)
• planned face to face meetings

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FNAL Organization
Who we are example

• Fermilab interests are distributed.
• CD Patty McBride, Margaret Votava, Vince
  Pavlicek
• BD Manfred Wendt (Instrumentation), Jim Patrick
  (possibly), Brian Chase
• TD Jerzy Nogiec (possibly)
• PD Geoff Savage
• Controls work as part of ILCTA_at_FNAL
• CD Ron Rechenmacher, Luciano Picolli, Gustavo
  Cancelo
• AD Dennis Nicklaus, Sharon Lackey, Brian Chase
• TD Ruben Carcagno, Jerzy Nogiec, Andrzej Makulski

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Friday agenda

• scope definition and anti-definition
• GG2 / RDR matrix row interaction
• communication paths
• bunch timing mechanics presentation
• Heiko Ehrlichmann (DESY)
• RDR plans