Dr. L. Beck

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Maier-Leibnitz-Laboratorium – Tandem Operation and Experiments –

Structure of MLL Tandem operation Experiments

Dr. L. Beck

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Maier-Leibnitz-Laboratorium

Am Coulombwall 685748 GarchingGermanyTel. 089/289-14271

MP 8 - 1970

Dr. L. Beck

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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

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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

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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

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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

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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

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FINE

FINE