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Instrumentation for the new H - S ource T est B ench. Linac-4 Ion Source Review 2011 Uli Raich CERN BE/BI. Parameters to be measured. Beam intensity Transverse Profile Transverse Emittance Energy Spread. Instrumentation at current test bench. Faraday Cup SEMGrid Transformer

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instrumentation for the new h s ource t est b ench

Instrumentation forthenewH-Source Test Bench

Linac-4 Ion Source Review 2011

Uli Raich CERN BE/BI

Uli Raich CERN BE/BI

parameters to be measured
Parameters tobemeasured
  • Beam intensity
  • Transverse Profile
  • Transverse Emittance
  • EnergySpread

Uli Raich CERN BE/BI

instrumentation at current test bench
Instrumentation atcurrenttestbench

Faraday Cup




Uli Raich CERN BE/BI

installed instruments
Installed Instruments
  • Faraday Cup
    • Measuresintensity
    • Usedas beam stopper
    • Readoutonlywithoscilloscope
  • SEMGridwith 20 wires
    • 1mm wiredistance in thecenter
  • Beam transformer
    • Sampledat 10 MHz
  • Emittancemeter + Faraday Cup

Uli Raich CERN BE/BI

faraday cup
Faraday Cup
  • Source intensity measured by a retractable Faraday Cup
  • Secondary electron emission are suppressed by polarization voltage which also eliminates parasitic electrons created in the source
  • Pneumatic in/out mechanism on PLC like LEIR is available and controlled by a knob
  • Oscilloscope is used for signal observation
  • For final operation a 1 MHz sampling ADC is foreseen

Uli Raich CERN BE/BI

energy spread
  • On thecurrenttest stand weused a spectrometermagnet + SEMGrid
  • The spectrometer will beusedfor a short time in the L4 tunneland will befreeafterwards
  • Forthenewtest stand a 45 kVfloating FC isunderdiscussion
    • Needs new design
    • Electronics andprogramto do energyscan

Uli Raich CERN BE/BI

semgrids for profile meas
SEMGrids for Profile Meas.
  • SEMGrid resolution: up to 0.5mm, up to 36 wires
  • New analogue electronics for 36 under design
  • Needs time resolved measurements (200 kHz)
  • New VME readout card has been developed (36 channels), series of 50 cards have been produced
  • In/out mechanism by motor with PLC control

Uli Raich CERN BE/BI

transverse emittance measurement
Transverse Emittance Measurement
  • Slit and grid phase space scanner
  • L-shaped 0.1mm slit moves under
  • 45 degrees
  • Slit and grids move independently
  • Positioning precision: 50 µm
  • Movement PLC controlled
  • Slit and grids mounted in 2 independent vacuum boxes whichcan be separated
  • Horizontal and vertical SEMGrid
  • wire distance .75 mm
  • 30 signal wires
  • readout with home built 36 channel 250 kHz ADC
  • time resolved profiles

Uli Raich CERN BE/BI

emittance m eter r eadout
EmittanceMeter Readout

Uli Raich CERN BE/BI

emittance evaluation
Emittance Evaluation

Uli Raich CERN BE/BI

pseudo scubexx exvaluation
Pseudo Scubexxexvaluation

Histogram of signal levels

Background for each slit


Emittance Plot

Emittance when taking less

and less channels around


Uli Raich CERN BE/BI

modifications to the emittance meter
ModificationstotheEmittance Meter
  • Long arm for the combined hor/ver slit poses mechanical problems
  • Use shorter separate slits or install stiff guiding
  • Program was designed for commissioning only
    • LabView for readout, write raw data onto big files
    • Evaluation program in C++ / Qt / Root
    • Either these programs must be adapted and maintained or replaced by standard CO Java application(problem of frequent adaptations)

Uli Raich CERN BE/BI

current transformers
Current Transformers

Good magnetic shielding

avoids interference from

nearby pulsing quads

Shielding simulation and

test measurements have

been done

New electronicsandsoftwarehasbeendevelopedfor L4Needs no additional work

Uli Raich CERN BE/BI

instruments for new test stand
Instruments fornewtest stand
  • SEMGrid
    • Same mechanismascurrentdevice
    • Wirescanbepolarized in additiontopolarisationwires
    • New analogueelectronics (foreseenfor Linac-4)
  • Faraday Cup
    • Possibilitytopolarizeupto46 kV (variable) tomeasureenergyspread
    • Alternative: spectrometerwhich will not beusedfor Linac-4 anymore
  • Chinese copyof LEBT transformer

Uli Raich CERN BE/BI

instruments for new test stand 2
Instruments fornewteststand (2)
  • New emittancemeter
    • Mechanicalchangesforeseen (2 independantslits?)
    • Software was designedforcommissioningonlyeitherneedstobemaintainedorreplacedbystandard CO Java application (4-5 monthsofwork)
  • Diagnosticsofelectronsfromsourcetobespecifiedand not counted
  • Instruments will beneeded ~ 4 monthsbeforeusageforassemblyandtest.

Uli Raich CERN BE/BI

cost table

Uli Raich CERN BE/BI