schokys2011/02/09 · schokys experience from an ice member… an instrument from bi+ fritz...
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Scho%kys
ExperiencefromanICEmember…
AninstrumentfromBI+Fritz+Tevatron
AlotofmaterialandhelpfromMathildeFavier
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CoasDngbeamsSingleparDclecirculaDngwithconstantfreqwillinduceacertainsignalonapick‐upatitspassagetk
SignalovermrevoluDons
SecondparDcleataslightlydifferentfrequencywillgiveasignalatΔfwithΔfincreasingateachharmonicoftherevoluDonfrequencyf0
Reference:F.CasperCAS2008
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ForalargenumberofparDclesthesignalwillgive:
ForGaussianandnon‐GaussiandistribuDons
ForalargenumberofparDcleswithnon‐GaussiandistribuDonthesignalwillbeofthetype:Scho6kybands
Onecandetermine:• MeanrevoluConfreq• FreqdistribuConofparCcles• Momentumspread• NumberofParCclesN
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Trasverseplanesignal
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Whatcanbemeasured?
PowerfultoolparassiDcDOESNOTPERTURBTHEBEAMS!!!
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4.8 GHz Slotted Waveguide Structure 60 x 60 mm aperture x 1.5 meters long Gated, triple down-mixing scheme to baseband Successive filtering from bandwidth of 100MHz to 11kHz Capable of Bunch by Bunch Measurement
100MHz 24MHz 11kHz11x400MHz
GateHybrid21.4MHz
500MHz 22MHz379MHz
BBQ Acquisition Electronics
400MHz 21MHz 0‐22kHz4.8GHz
Schottky Monitoring LHC
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Thedataflow
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Bunchspectra
90secintegraConCmeperbunchneeded:takessomeCmetogothroughatrain
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Tunesoftwobunchesduringe‐cloudMDslastNovember200
GUIworkingforIONSaRermanyproblemswithapplicaCon!Somemeasurementswithprotonsbutno“instability”observed
MathildeFavier
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BunchselecDon,FBCTdefinesfilledslotsthenclickingtechnique….
BunchselecConwithplay‐listfromE.Bravin:externalapplicaConsClltobeimplementedinGUIbutworkingwellalsolikethis90secintegraConCmeperbunchneeded:takessomeCmetogothroughatrain
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Non‐integertunesEmi6ancesChromaCcityMomentumspread
Tobe“checked/compared”withotherinstrumentstodefinelimits
WhichotherdatacanbeinteresDng?
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JJGras,usingMathemaDcaLibraryItrecordsthedataoneneed(thesamethattheonerecordsinTimber)thensomeanalysiscanbedone.MathildeisprovidingascripttoplotthetunespectraformulDplebunchesonsiteforstraightcomparisonofbchtobch.
AnextraapplicaDon:ROSALI
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• Status in 2010 – Schottky made operational towards the end of the year – GUI & calculation daemon provided by FNAL – Now logging tune, chroma, emittance & dp/p
• Consistency of emittance & dp/p still to be verified – Proton signals not useable during ramp
• Longitudinal blow-up wreaks havoc! – Ion signals text book beautiful!
• Plans for 2011 – Incorporate automatic bunch cycling on selected
bunches in GUI (currently via expert program)
Schottky Monitoring