SPS New Wire Scanner Mechanics Review Ray Veness BE/BI.
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Transcript of SPS New Wire Scanner Mechanics Review Ray Veness BE/BI.
SPS New Wire Scanner Mechanics Review
Ray VenessBE/BI
Contents
• Introduction– Wire scanners– Requirement and concept for the new wire
scanner• Project timeline and funding• Motivation for this meeting• What BI would like from this meeting
Limitations
Reproducibility much larger as required by specification
Beam size min LHC 130, PSB 2000 um
Flexible design of wire fork Deformation of fork are not
measured Angular position measurement
outside of vacuum system Lever arm play is not measured
Speed regulation circuit Analog feedback loop difficult to
optimize Secondary particle acquisition
system Requires accurate adjustment of
working range Saturation effect of PM
Dynamic of working range small < 200
Tail measurement limited by noise
High intensity beams cause an increase of background signal
Dynamic of working range reduced
Aging of bellows18.04.2013 Wire scanner design review; B.Dehning 4
Motor
&
Position
sensor
Proposal of PhD thesisJuan Herranz 28.09.2012
Optic FiberVacuum chamber
Motor Stator
Wire
Fork
Beam
Vacuum pipe
Optic Disc in vacuum
Resolver
BearingsShaft
Rotor in vacuum
Methodology - Conceptual Design
Slide Courtesy of J.Herranz Alvarez
6
From Schematic to Design
Optic FiberVacuum chamber
Motor Stator
Wire
ForkRF screen
Optic Disc in vacuum
Resolver
Bearings
Shaft
Rotor in vacuum
Magnetic lock
The Project
• Project timeline – Dec 2012: Production of a prototype for SPS installation
launched with MME– April 2013: External design review validates design– May 2014: Installation of the prototype tank in SPS sector 517– Jan 2015: Installation of the prototype instrument in the tank– EYETS 2016: Installation of a PS Booster prototype– LS2: Installation of 18 instruments + spares in PS, PSB, SPS– LS2-LS3: Installation of 4 or 8 instruments + spares in the LHC
• Funding– Fully funded by LIU for the injectors and HL-LHC for the LHC
18.04.2013 Wire scanner design review; B.Dehning 7
Motivations for the Meeting
• Smaller beam sizes and higher intensities will make this new design specification essential for transverse profile meaurement post-LS2, so it is a key instrument for the LIU project– Existing instruments are 30+ years old and suffer from obsolescence and reliability issues– Other projects and labs are already interested in this design
• We have a prototype that has been designed, built, installed in the SPS and has been operated in the lab, however…
• Manufacture cost was high, acceptable for a prototype but not for a series of 20-40 instruments– We need to address this both in design and production engineering
• Manufacture time was long and relied heavily on CERN-specific skills, (i.e. EB welding) at a time when CERN workshops were loaded i.e. during LS1)
• Some vacuum issues were found late during acceptance testing– We need to make all the qualification tests needed and agree early on materials, treatments (and
bakeout for the LHC)• The SPS prototype design we have will not fit in the PS Booster
– There are clear benefits from having one design, with a few different components across the whole accelerator complex
What BI would like from this meeting
• A list of all the things that we think we can improve from the prototype:– Design, standardisation, materials, manufacturing
technology, ease of manufacture, alignment– … and cost!
• Discussion on the best way forward:– Communication between BI, MME and VSC– In house manufacture vs. sub-contracting– Is this a large series?