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Dr. L. Beck
1
Maier-Leibnitz-Laboratorium – Tandem Operation and Experiments –
Structure of MLL Tandem operation Experiments
Dr. L. Beck
2
Maier-Leibnitz-Laboratorium
Am Coulombwall 685748 GarchingGermanyTel. 089/289-14271
MP 8 - 1970
Dr. L. Beck
3
Who is involved?
TUM/Uni-BW LMU
ClusterOrigin and Structure of the Universe
Cluster MAPMunich Centre for Advanced Photonics
Dr. L. Beck
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Where ?
UCN-SourceUCN-Experiments
Ultra Cold Neutrons
CompassSpinstructure of nucleons
ATLAS (LHC)
Astroparticle Physics Wimps
Nuclear PhysicsApplied nuclear physics
FRM-II
CERN
Tandem-accelerator
GSI
Nuclear- and Hadronphysics
Dr. L. Beck
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Tandem Laboratory Outline
Dr. L. Beck
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Operating statistics 2008
• Reliable operation 6600h
• ~13 MV
11
12
13
14
15
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2008
Te
rmin
al V
olta
ge
(M
V)
Maximum voltage for eperimental use
0
10
20
30
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2008
Da
ys
Routine operation Maintenance and shutdowns
Dr. L. Beck
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Charging Chains
Dr. L. Beck
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Terminal
14 Millionen Volts
Charging chains (red)
Stripperfoil
Accelerating tube
MP-Tandem van de Graaff®
2 sets of 3 charging chains
Dr. L. Beck
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Replacement of HE Charging chains
Why?
Ripple in Terminal voltage correlated with chain speed.
Installed September 1990 !
130 000 h of operation
Replaced April 2009
Dr. L. Beck
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Replacement of LE Charging chains
Why?
Installed August 2005
24 000 h of operation
Replaced May 2009
Dr. L. Beck
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LE-Chain Spacer Problem
Installed 8/2005 Replaced 5/2009
Delrin since 1993 (Nylon before)
Dr. L. Beck
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Lens 5 – Tank exit
beam at maschine exit with y-deviation?Solution: y-steering
Lower field
Dr. L. Beck
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Lens 5
Resistance: 0,4 Ohms allInductance: good coil 800 µH – bad coil 150 µH
Replacement of all 4 coils in December 2008 (Spare coils from Heidelberg)
Dr. L. Beck
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Idler Wheels - Storage
Storage in dry atmosphere!
Dr. L. Beck
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SF6 – 2,5 t in 2008
From Vivitron Company: Avantec
Dr. L. Beck
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Scientific Council of MLL (March 2001):
The Tandem accelerator as a research machine should be
phased out when MAFF becomes operational,
as foreseen for 2004.
MAFF project stopped! No funding!
Dr. L. Beck
17
Part III: Experiments
Nuclear Physics Applied Physics
Great demand for beamtime in the next years
Dr. L. Beck
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Experiments 2008
Distribution of beam time to experiments
AMS18%
Irradiation of cells14%
ERDA19%
Nuclear Physics21%
Detector Tests7%
Training of students7%
Irradiation of U-Samples
14%
Dr. L. Beck
19
Ion Beam Time 2008
0,00
5,00
10,00
15,00
20,00
25,00
H-1
H-2
He-3
He-4
Li-7
B-11
C-12
O-16
Al-26*
Cl-36 *
Ca-41*
Mn-53 *
Ni-58
Ni-59*
Ni-63 *
I-127
Au-197
Pu-244 *
Others
Ion beam time in percent of total available beam time.Isotopes marked with an * were measured in AMS studies
Dr. L. Beck
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Q3D – Magnetic spectrograph
Dr. L. Beck
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Q3D - Principle
High resolution nuclear physics ERDA
Dr. L. Beck
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SupraleitendesNanoskop
für angewandtekernphysikalische
Experimente
Bestrahlung von lebenden Zellen miteinzelnen, hochenergetischen Ionen
auf 0,5 µm genau.Irradiation of living cells with single ions.Study of DNA – repair mechanisms.
Biochemische Markierungder Schäden
im Erbgut DNA
Micro-beam setup SNAKE
Dr. L. Beck
23
Spirit
Support of Public and Industrial Research using Ion beam Technology
SPIRIT represents an Integrated Infrastructure Initiative funded by the European Commission.
SPIRIT integrates 11 leading ion beam facilities from 6 European Member States and 2 Associated States.
7 partners provide TransNational Access to their facilities. Ions are supplied in an energy range from below 10 keV to more than 100 MeV for modification and analysis of solid surfaces, interfaces, thin films, and soft matter, in particular on the nanometer scale.
Successes:
Dosimetry of fast neutronsHiroshima
Detection of a supernova2-3 Mio. years ago
AMS Setupultrasensitive detection of isotopes up to 1 : 10 000 trillions (10-16)
Dr. L. Beck
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GAMS
Dr. L. Beck
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Neutron detectors
Pulsed Neutron source
Energy measurement via
time of light
TOF
Scattering angle
Cryostat with detector
Detection of Dark MatterDetection of Dark Matter• Development of cryo-detectors for the detection of dark matter candidates (WIMPs)• Installation of a KELVINOX400 3He/4He cryostate at MLL• Test with neutrons hitting a CaWO4 crystal at ~10mK
Experimental setup:
Dr. L. Beck
27
Instruments 2008Instruments
Gams19%
I-607%II+50
10%II-109%
II-503%
Q3D24%
Snake13%
I-401%
I-201%
I+1013%
Gams
I+10
I-20
I-40
I-60
II+50
II-10
II-50
Q3D
Snake
Dr. L. Beck
28
FINE
FINE