beam diagnostics for decelerator hitrap
TRANSCRIPT
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BeamBeam DiagnosticsDiagnostics forfor DeceleratorDecelerator HITRAPHITRAP
DITANET-WorkshopLow Energy and Low Current Diagnostic Methods
25.11.09
Michael WitthausHannes ReegPeter Forck
Rainer HaseitlChristiane Andre
Wolfgang Kaufmann
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BeamBeam DiagnosticsDiagnostics forfor DeceleratorDecelerator HITRAPHITRAP
Overview
- HITRAP-facility- Beam Diagnostic Devices- Measurement-Results- Summary and Outlook
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HITRAPHITRAP
HITRAP
up to 11 MeV/u
HITRAP-Operation: 150 MeV/u to 400 MeV/u
Deceleration to 4MeV/u HITRAP-Injection
HITRAP-Experiments:
- precision experiments with single ions- experiments with low energy heavy ion beam- spectroscopy with highly charged ions
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HITRAP HITRAP -- BeamlineBeamline
beam from ESR
Interdigital H-structure (IH)
Radio Frequency Quadrupole (RFQ)
108 MHz buncher
Experimental area on the topof tunnel
Cooler TRAP
verticalbeamlattice
Quadrupole
216 MHz buncher
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HITRAP HITRAP -- BeamlineBeamline
5 keV/q
0.5 MeV/u
6 keV/u
4 MeV/u
under construction
to experiment
7m
Beamtime Ion species
May 2007 Ni28+
August 2007 Ne10+
August 2008 Au79+
October 2008 Ni28+
February 2009 Ni28+
April 2009 Xe54+
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scintillation sreens, harp systems
Faraday cups
BeamBeam DiagnosticsDiagnostics of HITRAPof HITRAP
Objectives of Beam Diagnostics (BD) for HITRAP:
- beam position and profile
- detection of particles and energy
Challenges: low beam intensity (~1E6 ions / pulse; µA -range)
low repetition rate (1 pulse in ~ 70 sec., via ESR)
single beam pulse with length of 3 µs
Different beam diagnostic devices are necessary
- beam intensity (transmission through beamline)
Faraday cups, capacitive pick ups
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LocationsLocations of HITRAP of HITRAP BeamBeam DiagnosticDiagnostic
7m under construction
to experiments
Faraday cupsScintillation screensHarps
„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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LocationsLocations of Faraday Cups of Faraday Cups overover HITRAP HITRAP LatticeLattice
7m under construction
to experiments
Faraday cupsScintillation screensHarps„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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Faraday CupFaraday Cup
pneumatic drive
Mechanics
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Faraday CupFaraday Cup
Scheme of Faraday cup
transimpedance amplifier from FEMTO (Berlin)
Range: 10nA to 10mA Output: 1V f.s. (50 load)pneumatic drive Ω
window frame yoke
Mechanics Electronics
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FaradyFarady Cup Cup –– Data Data AcquisitionAcquisition
FEMTO 1
RelayMultiplexer
FEMTO 1+nFC 1+n
USB-Digital I/O-Box
FEMTO-Amplifier
Oscilloscope
PC with LabVIEW at HITRAP container
Remote-Desktop-PC at CR
USB-DIO96H (NI)FC 1
LeCroy 6100A
Pneumatic drives are controled by operator at control room (CR).
4 FCs are installed
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FCFC--MeasurementMeasurement--ResultsResultsNe10+, ~1.8E6 particles, 1.5µA
Time-resolved measurements of low currents
Faraday cups are very helpful for beamline setups
Transmissions can be calculated
0.5 µA/div. 1µs/div.
Output signal of FC
Hardware was reliably operating
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LocationsLocations of HITRAP of HITRAP BeamBeam DiagnosticDiagnostic
7m under construction
to experiments
Faraday cupsScintillation screensHarps
„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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LocationsLocations of of ScintillationScintillation Screens Screens overover HITRAP HITRAP LatticeLattice
7m under construction
to experiments
Faraday cupsScintillation screensHarps„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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ScintillationScintillation Screen Screen -- SetupSetup
Screen illuminated:
Beam spot on screenFor beam profile measurements
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ScintillationScintillation Screen Screen -- MechanicMechanicScintillation screen
Part of thepneumatic drive
Scintillation screen:
- YAG (Y3AI5O12)
Yttrium-Aluminium-Garnet
- mono crystalline
Good light yield at low energyFlange diameter 100 mm, CF 100
70 mm
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Data Data AcquisitionAcquisition forfor ScintillationScintillation ScreensScreens
Digital-Camera on diagnostic chamber
Digital-Camera with CVSoptical fiber for long-distance (> 1km)
FireWire (IEEE1394): up to 5 meters
GSI timing bus
CCD Digital Camera for precise triggering:
- fast scintillation material can be used
- short pulses can be detected
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ScintillationScintillation Screens Software Screens Software -- ""BeamViewBeamView""
horizontal and vertical projection
camera controls
log window and image information
live image withup to 35 frames/s
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ScintillationScintillation Screens Screens ExamplesExamples of measurementsof measurements
False colour pictures show more details
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ScintillationScintillation Screens Screens MeasurementsMeasurements--ResultsResults
Beamtime October 2008, Ni28+
4MeV/u
2.3MeV/u
Separated spots represent different energies
beam
dipolemagnet scintillation
screen
Image from scintillation screen behindthe IH-structure and dipole magnet
The scintillator screens are very helpful for operating !
Not detectable with harpsystems and ring pick ups
IH-structure
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LocationsLocations of HITRAP of HITRAP BeamBeam DiagnosticDiagnostic
7m under construction
to experiments
Faraday cupsScintillation screensHarps
„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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LocationsLocations of of HarpsHarps overover HITRAP HITRAP LatticeLattice
7m under construction
to experiments
Faraday cupsScintillation screensHarps„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
Harp 1 Harp 2 Harp 3
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HarpHarp Systems Systems -- LayoutLayout
beam
wires
I
I/U-converter
harp assembly
analog and control devicesfunction diagram
control program on screen at CR
0.5 - 2 mm
Harp systems arenot destructive !
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HarpsHarps Results Results –– MeasuredMeasured ProfilesProfiles
HARP 1
HARP 2
HARP 3
Profiles were measured in August 2008 ( Au79+)
Range: 2nA/V 20nA f.s.
beam
horizontal vertical
intensities were too low
Measurements usefulonly in lowest range(625 pA „Soft“-zoom necessary)
Results:
Operating was heavily affected
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LocationsLocations of HITRAP of HITRAP BeamBeam DiagnosticDiagnostic
7m under construction
to experiments
Faraday cupsScintillation screensHarps
„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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LocationsLocations of Pick of Pick UpsUps overover HITRAP HITRAP LatticeLattice
7m under construction
to experiments
Faraday cupsScintillation screensHarps
„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
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High frequency range :
Low frequency range :
CapacitiveCapacitive Pick Up Pick Up –– FunctionFunction DiagramDiagram
( ) ( )tIa
AcC
tU beamim ⋅⋅=πβ 2
1
( )dt
dIa
Ac
RtU beamim ⋅⋅=
πβ 2
Time-of-Flight (TOF) measurement ispossible with two pick ups
determination of beam energy
Beam (ion bunch) influences charge on thepick up plates
Charge (current) flows over the pick up platesthrough R into ground
-
-
kTBRu RMSnoise 4, =
cutωω >>
cutωω <<
RCCut
1=ωB = bandwidth
High impedance
Low impedance
U
t
U
t
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High High ImpedanceImpedance „„TubularTubular" Pick Up" Pick Up
„Tubular“ pick up in the HITRAP beamline
high-impedance amplifier (1MOhm, 10 MHz Bandwidth)
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TubularTubular Pick Up Pick Up -- MeasurementMeasurement--ResultsResults
FC
Beamtime February 2009 (Ni28+)
The tubular pick up did notshow signal induced bythe extracted ESR-beam.
Suggestion: reduced-length tubularpick up should help
tubular pick up
Yellow trace: 500mV/div.; 5 µs/div.
Blue trace: 100mV/div.; 5 µs/div.
Output signal of the tubularpick up should look simularto a FC-signal.
direct irradiationof pick up plate
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LocationsLocations of Pick of Pick UpsUps overover HITRAP HITRAP LatticeLattice
7m under construction
to experiments
Faraday cupsScintillation screensHarps„Tubular" pick upsRing pick ups
two bunchers IH-structure RFQ TRAP
beam
Overview:
1 2
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Ring Pick Up Ring Pick Up –– Design Mechanic Design Mechanic
ring electrode
Ring pick up: design optimized for 50 Ohm impedance
isolated carrier pick up at HITRAP
output plug
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CapacitiveCapacitive Ring Pick Ring Pick UpsUps -- ResultsResults
The pick up signals couldonly be detected withaveraging of 6 measurements
Beamtime October 2008 (Ni28+)
TOF-calculations possible
Long waiting period(here 7 minutes)
Note: 20mV/Div. and 5ns/Div.; beam current was > 1,5 µA
Image shows typical sig-nals of beam bunches
but
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CapacitiveCapacitive Ring Pick Ring Pick UpsUps -- Results Results
Pick up 1 after quadrupole
Unfortunately in most of the cases measurements are not possible
Sensitivity of the systemis not high enough(signal/noise ratio to low)
RF-reference
Pick up 2 in front of IH
Beamtime October 2008 (Ni28+)
Note: red trace: 50mV/div.; 10 ns/div.; blue and green traces: 20mV/div.; 10 ns/div.
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SummarySummary and Outlookand Outlook
March 2010 Next beamtime
With Faraday-cups we can detect the low energy / intensity beams ! (Calculation of transmissions, time-resolved measurement)
The scintillator screens are essential for operating !(detection of position up to 300 nA and < 2 µs beam pulse)
Pick ups are important for operating, but the sensitivity presently isnot high enough (signal/noise ratio to low)
Modify tubular pick up ?
Suggestion for ring pick ups: low-noise head amplifiers between pick upsand transmission lines to improve S/N ratio(not yet decided)
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ThanksThanks toto
Rainer JohänntgesChristoph Dorn
Pjot KowinaHorst Graf
Frank HerfurtMichael KaiserWinfried BarthOliver KesterLudwig Dahl
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ENDEND
Thanks foryour attention