Johannes Gutenberg-Universität Mainz Institut für ... · "Vacoflux" Foil Production und energy...

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1 2 nd Meeting Polarized Nucleon Targets for Europe in the 6 th European Framework Program Miltenberg, June 2 nd 4 th 2005 Andreas Thomas Status of the the Mainz Real Photon Facility Institut für Kernphysik Johannes Gutenberg-Universität Mainz 1.- MAMI upgrade 1.5GeV 2.- Tagger upgrade 3.- Crystal Ball 4.- Frozen Spin Target L 1 L i L i+1 E B c e E R B c e E R dipole magnet: Magnetic field B dynamic coherence condition: ) 2 ( 1 R n L L i i static coherence-condition: k L 1 D B=1.28T =0.1224m (2.45GHz) n=1, z=90 D=12.86m E=7.48MeV RTM 3 E out =z E focusing only on the Linac-axis Race Trake Microtron MAMI

Transcript of Johannes Gutenberg-Universität Mainz Institut für ... · "Vacoflux" Foil Production und energy...

Page 1: Johannes Gutenberg-Universität Mainz Institut für ... · "Vacoflux" Foil Production und energy measurement of the Bremsstrahlungs photons ap p z N N N N A t b cos Determination

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2nd Meeting ‚Polarized Nucleon Targets for Europe‘in the 6th European Framework Program

Miltenberg, June 2nd – 4th 2005Andreas Thomas

Status of thethe Mainz Real Photon Facility

Institut für KernphysikJohannes Gutenberg-Universität Mainz

1.- MAMI upgrade 1.5GeV

2.- Tagger upgrade

3.- Crystal Ball

4.- Frozen Spin Target

L1

Li

Li+1

E

BceER

BceER

dipole magnet:Magnetic field B

dynamic coherence condition:

)2(1 RnLL ii static coherence-condition:

kL1

D

B=1.28T=0.1224m (2.45GHz)n=1, z=90D=12.86m

E=7.48MeV

RTM 3

Eout=z•E

focusingonly on theLinac-axis

Race Trake Microtron MAMI

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RTM 390 turns855 MeV

3.5 MeV

RTM 118 turns15 MeV

RTM 251 turns180 MeV

LINAC

Racetrack-Mikrotron

450 Tonnen

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To double theElectron energy One would need:

2000 To

Not possible to be realized!!

2000 to 2000 to

250to

250to250to

250to

HDSM (Harmonic Double Sided Microtron)

43 Turns, 1.500.000.000 eVolt

Solution:

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MAMI upgrade

Status MAMI upgradeHDSM-DipolesAssembledField maps doneVacuum chamber readyCorrection plate ready

Beamlines exp. ready

2.45GHz LinacAssembledTests next month

4.9GHz Linac2 sections ready6 sections until end 2005 First beam ca. beginning of 2006

31th May

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Moeller triggerCoincidence

eeE

eE

Electronbeam

Radiator(Moeller target)

Primarybeam%2.01.8 tp

"Vacoflux" Foil

Production und energy measurement of the Bremsstrahlungs photons

zppaNNNNA bt cos

Determination of the degree of polarization ofthe electron beam (Moeller Polarimeter);Circularly pol. photons

A2 Tagging system1.

2.

3. Coherent production of linearly polarizedphotons on a diamond radiator

Tagger upgrade

Beam planned for end of 2005

4th April

17th May

31th May

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Run 2004 – 4/20053900 hours beam on targets(H2 , D2 , C, Ca, Pb )

Rare eta decayMagnetic Moment DeltaMedium modificationsPion Production

14th April

3He/4Helium Dilution refrigerator with 4helium-evaporation precooling stages for the incoming 3He, the radiation shields and

internal coil.

EU money is partially used for the constructionof he -wave parts of the cryostat at JINR Dubna

Frozen Spin Target

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Physics Program:

100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850-200

-100

0

100

200

300

400

500

600

totalpnpnp

MAID2000 (N)

Phys. Rev. Lett. 84 (2000) 5950Phys. Rev. Lett. 87 (2001) 022003Phys. Rev. Lett. 88 (2002) 232002

GDH

-

(b

)

photon energy (MeV)

CB-Collaboration Meeting End of JuneProposals for next round

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A2 Targets for MAMI C experiments

Liquid Hydrogen/Deuterium Target

Liquid 3Helium Target

Frozen Spin Target for Crystal BallMauricio

Polarized 3Helium Gas Target Patricia