Post on 25-Jan-2021
Dr. L. Beck 1
Maier-Leibnitz-Laboratorium – Tandem Operation and Experiments –
Structure of MLLTandem operationExperiments
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 4
Where ?
UCN-SourceUCN-Experiments
Ultra Cold Neutrons
CompassSpinstructure of nucleons
ATLAS (LHC)
Astroparticle PhysicsWimps
Nuclear PhysicsApplied nuclear physics
FRM-II
CERN
Tandem-acceleratorGSI
Nuclear- and Hadronphysics
Dr. L. Beck 5
Tandem Laboratory Outline
Dr. L. Beck 6
Operating statistics 2008
• Reliable operation6600h
• ~13 MV11
12
13
14
15
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2008
Term
inal
Vol
tage
(MV
)
Maximum voltage for eperimental use
0
10
20
30
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2008
Day
s
Routine operation Maintenance and shutdowns
Dr. L. Beck 7
Charging Chains
Dr. L. Beck 8
Terminal
14 Millionen Volts
Charging chains(red)
Stripperfoil
Accelerating tube
MP-Tandem van de Graaff®
2 sets of 3 charging chains
Dr. L. Beck 9
Replacement of HE Charging chains
Why?
Ripple in Terminal voltage correlatedwith chain speed.
Installed September 1990 !
130 000 h of operation
Replaced April 2009
Dr. L. Beck 10
Replacement of LE Charging chains
Why?
Installed August 2005
24 000 h of operation
Replaced May 2009
Dr. L. Beck 11
LE-Chain Spacer Problem
Installed 8/2005Replaced 5/2009Delrin since 1993 (Nylon before)
Dr. L. Beck 12
Lens 5 – Tank exitbeam at maschine exit with y-deviation?Solution: y-steering
Lower field
Dr. L. Beck 13
Lens 5Resistance: 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 14
Idler Wheels - Storage
Storage in dry atmosphere!
Dr. L. Beck 15
SF6 – 2,5 t in 2008
From VivitronCompany: Avantec
Dr. L. Beck 16
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 PhysicsApplied Physics
Great demand for beamtime in thenext years
Dr. L. Beck 18
Experiments 2008Distribution 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 20
Q3D – Magnetic spectrograph
Dr. L. Beck 21
Q3D - Principle
High resolution nuclear physicsERDA
Dr. L. Beck 22
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 AssociatedStates.
7 partners provide TransNational Access to their facilities. Ions are supplied in an energy rangefrom 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.
http://www.spirit-ion.eu/Project/Transnational-Access.html
Successes:
Dosimetryof 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 25
GAMS
Dr. L. Beck 26
Neutron detectors
Pulsed Neutron source
Energy measurement via
time of light
TOF
Scattering angle
Cryostat with detector
DetectionDetection of of DarkDark MatterMatter• 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%
GamsI+10I-20I-40I-60II+50II-10II-50Q3DSnake
Dr. L. Beck 28
FINE
Maier-Leibnitz-Laboratorium �– Tandem Operation and Experiments – Maier-Leibnitz-LaboratoriumWho is involved?Where ?Tandem Laboratory Outline Operating statistics 2008Charging ChainsMP-Tandem van de Graaff®Replacement of HE Charging chains Replacement of LE Charging chains LE-Chain Spacer ProblemLens 5 – Tank exitLens 5Idler Wheels - StorageSF6 – 2,5 t in 2008Scientific Council of MLL (March 2001):Part III: ExperimentsExperiments 2008Ion Beam Time 2008Q3D – Magnetic spectrographQ3D - PrincipleMicro-beam setup SNAKESpiritAMS SetupGAMSDetection of Dark MatterInstruments 2008FINE