Beam instrumentation: low energy, low intensity beams

50 %
50 %
Information about Beam instrumentation: low energy, low intensity beams
Technology

Published on July 27, 2011

Author: jharas

Source: slideshare.net

Description

Project update on low energy, low intensity beam instrumentation

Janusz HarasimowiczDaresbury, 13 July 2011Project Update Low Energy, Low Intensity Beam Diagnostics

Ultra-low Energy Storage RingUSR @ FAIRFacility for Antiproton and Ion Research

Challenges Intensity Current range: µA → fA Close to noise limitations (fA) No standard UHV components for low current measurements Position Low signal: ~1 µV @ 0.1 mm Noise level: >2.5 µV @ 20 MHz BW Low velocity: 0.025 c → 0.006 c Profile Low energy: <300 keV Low intensity: ~106 pps (sub-pA) Particles: antiprotons AND protons

Faraday Cup

Electrostatic Simulations

Noise Sources E-M interference (shielding) Triboelectricity C Parasitic (low-noise cables) capacitance Ground loops (triaxial cables) Faraday Beam Contamination Cup (cleaning) Leakage current (guarding) HV Ammeter Charge escape Supply (repelling electrode) Electrostatic coupling (low ripple, rigidity)

Signal Cable Inner shield Outer shield Triaxial cableCurrent Ground Ammetersource loop In-house built UHV triaxial solution for ultra-low currents measurements

Amplifiers Slow Slow Fast extraction extraction extraction (DLPCA-200) (DLPCA-200) (LCA-2-10T) 1012 Gain 106 107 1011 1013 2 HzUpper 1.1 kHz 500 kHz 400 kHz 0.3 Hzcut-off (10 Hz) 0.1 Hz 0.2 sRise/fall 0.7 µs 0.9 µs 300 µs 1s time 5s Input 1.8 450 0.18 fA/√Hz 4.3 fA/√Hz noise pA/√Hz fA/√Hz @ 0.2 Hz Max 10 pA (1012) 10 µA 1 µA 100 pAinput I 1 pA (1013)

Experimental Setup Floating feedthrough Faraday cup vesselElectron gun

Initial results with electrons

Initial results with electrons I = (V – V0) / G G [V/A] = 1012 ± 2% I = 97.7 fA ± 2.3 fA

Initial results with electrons I = (V – V0) / G G [V/A] = 1012 ± 2% I = 14.6 fA ± 0.9 fA

End of Part 1Annihilation! Fast pionsAntiproton Recoiling nuclear fragments …

Capacitive Pick-Up

Signal Estimation Estimate: ΣU ≈ 600 Vp-p ∆U ≈ 1 µVp-p / 0.1 mm ×46 dB: ΣU ≈ 120 mV ∆U ≈ 200 µV / 0.1 mm

Experimental Setup

Experimental Setup

Wire Alignment

First Measurements

First Measurements

First Measurements

End of Part 2Labview Application

Secondary Emission Monitor Mesh MCP + goes phosphor here over here Foil back there

Principle of Operation (Thin) foil Mesh Beam MCP Secondary electrons Phosphor up to -10 kV +2 kV approx. +5 kV

Secondary electrons

Protons 200 keV p 50 keV p 5 mm 50 mm 20 keV p 3 mm 6 mm MCP/phosphor Foil Mesh (0V, +2 kV, +5 kV) (-10 kV) (0 V) Primary beamAdditional shielding needed

H– (same conditions) 50 keV H– 20 keV H– 200 keV H– Primary beamAdditional shielding needed

Experiment @ MSL, Stockholm Al plate: –6.4 kV MCP: +1.2 kV Phosphor: +2.0 kV Collimator Al Mesh MCP1 MCP2plate Grounded metal ring Fluorescent screen

Experiment @ MSL, Stockholm Charged particles Bremsstrahlung photons? F.S. = fluorescent screen

Shielded SEM Entrance mesh FoilExit mesh(if needed)

2-in-1 SEM Foil + MCP MCP alone

Black electrons 10 eV Green electrons 5 eV Red electrons 1 eV Blue electrons 0.1 eV foil -5 kVSecondary electrons emitted in 60 deg half angle (120 deg)

Black electrons 10 eV Green electrons 5 eV Red electrons 1 eV Blue electrons 0.1 eV foil -7.5 kVSecondary electrons emitted in 60 deg half angle (120 deg)

Black electrons 10 eV Green electrons 5 eV Red electrons 1 eV Blue electrons 0.1 eV foil -10 kVSecondary electrons emitted in 60 deg half angle (120 deg)

Annihilation!

End of Part 3Annihilation!

Thank you for your attention

Add a comment

Related presentations

Related pages

Scintillating Screen Studies for Low Energy, Low Intensity ...

SCINTILLATING SCREEN STUDIES FOR LOW ENERGY, LOW ... on the required beam instrumentation. Low energy ... Studies for Low Energy, Low Intensity Beams
Read more

FARADAY CUP FOR LOW-ENERGY, LOW-INTENSITY BEAM ...

challenges of measuring the beam intensity in ... will require ultra-sensitive instrumentation ... in the USR due to low intensities and low energies of ...
Read more

Development of Instrumentation for Low Energy Beams

Development of Instrumentation for Low Energy Beams Thesis submitted in accordance with the requirements of the University of Liverpool for the degree of ...
Read more

Scintillating Screen Studies for Low Energy, Low Intensity ...

... Japan MOPD024 SCINTILLATING SCREEN STUDIES FOR LOW ENERGY, LOW INTENSITY BEAMS ... Beam Instrumentation ... Low Energy, Low Intensity Beam ...
Read more

Low Energy Beam Diagnostics Developments within DITANET

LOW ENERGY BEAM DIAGNOST ICS DEVELOPMENTS WITHIN DITANET * ... of beam instrumentation for such beams ... monitoring of low energy, low intensity beams ...
Read more

Low Energy Beam Diagnostics Developments within

Low Energy Beam Diagnostics Developments ... The development of beam instrumentation for such beams poses many ... on Low Energy and Low Intensity Beam ...
Read more

Particle Detectors for Low Intensity Ion Beam Diagnostics

Particle Detectors for Low Intensity ... Sometimes one might wish to handle very low intensity beams, ... dependent on the beam type and energy: ...
Read more

Thin Foil-based Secondary Emission Monitor for Low ...

THIN FOIL-BASED SECONDARY EMISSION MONITOR FOR LOW INTENSITY, LOW ENERGY BEAM PROFILE MEASUREMENTS ... 06 Beam Instrumentation and Feedback
Read more

LEIR BEAM INSTRUMENTATION - CERN Document Server

LEIR BEAM INSTRUMENTATION C. Bal, E. Bravin, ... The Low Energy Ion Ring ... serie of long low intensity ion pulses from Linac 3, ...
Read more