conference photo sponsorship workshop was supported by international committee for high energy spin...

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Sponsorship

Workshop was supported by

•International Committee for High Energy Spin Physics•International Science and Technology Center

• Russian Foundation for Basic Research

Dmitri Toporkov Summary of the 10th Workshop onSPIN2004 Polarized Sources and Targets PST2003

Contents

Polarized Gas Target, ABS and LDS 10 talks

Polarized Solid Targets 3 talks

Polarized Electron Sources 5 talks

Polarized Ion Sources 3 talks

Polarimetry 5 talks

Photocathods 9 talks

ISTC special session 4 talks


Polarized Gas Target, ABS and LDSFrank Rathmann (COSY) Polarized Gas Targets.

Eugeny Tsentalovich (MIT) The BLAST Polarized H/D Target

Paolo Lenisa (INFN-Ferrara) The HERMES Transversely Polarized Hydrogen Target

Werner Heil (IP,Mainz) Polarized 3He Targets

Tomohiro Uesaka (CNS,Tokyo) Polarized 3He Target for the Polarization Correlation Experiment at NUCLOTRON.

Hans Beijers (KVI) RF-Induced spin Transitions in Polarized Atomic Beam Sources.

Dmitri Toporkov (BINP) Analysis of the Beam Intensity from ABS.

Benjamin Clasie (MIT) Laser Driven Polarized H/D Sources and Targets

Yuri Shestakov (BINP) High Density Polarized Deuterium Gas Target for the VEPP-3 Electron Storage Ring

Anatoly Zelenski (BNL) H-Jet Polarimeter for RHIC


Polarized Gas Target, ABS and LDS

HERA, Bates,NIKHEF

COSY, IUCF, RHIC

HESR

Gas Targets:- thin- isotopically pure- polarized

Storage Rings:- high stored currents- low background

Presently achievable Luminosities

L 1029 – 1032 cm-2s-1 (protons) (electrons)

3, ,H D He

BINP


p d

p

e e+

e

Frank Rathmann (COSY) Polarized Gas Targets.


Although operated since only about 10-15 years, Polarized Gas Targets have been very successful in obtaining high quality data:

IUCF pp elastic

pp pp0, pp pn +

pd elastic

EDDA pp elastic 500 – 2500 MeV

TRI test at COSY

VEPP-3, AmPS

T20 measurements in ed reactions

HERMES at HERA employed 3He, H and D target in DIS



HERA e+/- ring: •45 mA•27.5 GeV•P 55 %

HERMES spectrometer


Paolo Lenisa (INFN-Ferrara) The HERMES Transversely Polarized Hydrogen Target


–Smooth running conditions

–Small amount of recombination (2%)

–Small effect of beam induced depolarization (<1%)

Target performance in 2002/2003

H transversely polarized target running @ HERMES and resonances under control

Additional coils installed for the present run

Target polarization in 2002/03 Pt = 0.741

Pt = 0.741 0.061, density = 1.1x1014 nucl/cm2

Relative factor of merit P2t 0.6x1014



Flux of polarized deuterium atoms injected into the cell at/sec. Magnetic poletip field of superconducting magnets up to 4.8 TPzz=0.4, target thickness viewed by the detector 8x1013at/cm2

168.2*10

13x14x400 mm

Inner diam. 44 mm


Yuri Shestakov (BINP) High Density Polarized Deuterium Gas Target for the VEPP-3 Electron Storage Ring



New pumps and pipes with larger conductivity improved vacuum conditions in the top chambers significantly. The ABS intensity increased by 30-40%.Installation of SFT/WFT unit reduced ABS intensity by about 30 %.

Now vacuum conditions in the bottom sextupole chamber are becoming the dominating factor in atomic beam attenuation.

• ABS in BLAST magnetic field (~2 kGs)• BLAST magnetic field reduces ABS

intensity by factor of 2.

•New sextupoles will be enclosed in shielding cases.

•Temporary shields have been installed on three out of four magnets in the upper sextupole unit.

•Even these shields reduced the intensity attenuation caused be BLAST magnetic shield from factor of 2

down to 15 %.

Eugeny Tsentalovich (MIT) The BLAST Polarized H/D Target


Flux of polarized hydrogenatoms per second171.2*10


Anatoly Zelenski (BNL) H-Jet Polarimeter for RHIC



Hermes (ABS) Novosibirsk ( ABS )

( Tensor polarization PZZ )

Gas H D D

F 6.5 4.6 8.2 (1016 atoms/s)

T 7.5 14 8 (1013 cm-2)

f 0.93 0.95

pz,atomic 0.92 0.89

F(f pz,at)2 0.48 0.32 0.13 – 0.52 (1017 atoms/s)

t(f pz,at)2 5.5 10.0 1.3 – 5.1 (1013 cm-2) Argonne (LDS) IUCF (LDT) MIT (LDT)

1995 1998 Preliminary (units)

Gas H D H D H

F 1.7 0.86 1.0 1.0 1.1 ( 1018 atoms/s )

t 0.3 0.4 1.5 ( 1015 cm-2 )

f 0.75 0.75 0.48 0.48 0.56

pz,atomic 0.51 0.42 0.37

pz,total 0.145 0.102

F(f pz,at)2 2.5 1.1 0.32 0.15 0.47 ( 1017 atoms/s )

t(f pz,at)2 0.93 0.61 6.4 ( 1013 cm-2 )

Benjamin Clasie (MIT) Laser Driven Polarized H/D Sources and Targets



1m

Tomohiro Uesaka (CNS,Tokyo) Polarized 3He Target for the Polarization Correlation Experiment at NUCLOTRON.

Polarized Solid Targets

Patric Hautle (PSI) Polarized Solid Targets

Michio Hatano (RIKEN) Design and Performance of the Polarized Solid Proton Target for the RI Beam Experiments

Andrey Dudnikov (BINP) Spin Isomeres and Ferromagnetic Particles in MR Tomography



Polarised Solid Targets in usePolarised Solid Targets in usePlethora of GDH Experiments on Photon BeamsPlethora of GDH Experiments on Photon Beams

USA (JLab, SLAC, TUNL, LEGS, GRAAL)

Germany (MAMI, ELSA)

Japan (SPring-8)Gluon Polarisation MeasurementsGluon Polarisation Measurements

CERN (COMPASS)

SLAC (E161)

OthersOthers n-d scattering length (PSI)

„DNP Dynamics“ (PSI, ILL)

RI Beams (Japan)

. . . . .


Patric Hautle (PSI) Polarized Solid Targets



Michio Hatano (RIKEN) Design and Performance of the Polarized Solid Proton Target for the RI Beam Experiments

Polarized Electron Sources

Eugeny Tsentalovich (MIT) Polarized Electron Source at the MIT-Bates

Klaus Shroeter (MPI NP) Status of the Pulsed Electron Source for Atomic Collision Experiments

Eugeny Konstantinov (BINP) Project of Polarized Electrons Source Based on GaAs Cathode S-band RF Photogun

Alexander Potylitsyn (TPU) Separation of Spin States in Unpolarized Positron Beam Interacting With Circularly Polarized Laser Photons

Yury Shatunov (BINP) Electron-Ion Collisions at RHIC Using a High Intensity Self-Polarizing Electron Ring




Eugeny Tsentalovich (MIT) Polarized Electron Source at the MIT-Bates

I (Peak), mA

T, sec

Rep.Rate, Hz

I(Aver.), A

P(laser) (QE1%)

P(laser) (QE.05%)

No ring (SAMPLE)

10 25 600 Hz 120 3 W 60 W

Stretcher mode

10 4 600 Hz 20 3 W 60 W

Storage mode

10 4 < 1 Hz << 1 3 W 60 W

Requirements


0

50

100

150

200

250

300

4 5 6 7 8 9 10 11

Electron energy, GeV

Po

lari

zati

on

tim

e, m

in

0

2

4

6

8

10

12

14

16

18

4 5 6 7 8 9 10 11

Electron energy, GeV

Po

lari

zati

on

tim

e, m

in


• The superbend control of polarization time.

8-15min polarization time is achievable.

Superbend magnet Yury Shatunov (BINP) Electron-Ion Collisions at RHIC Using a High Intensity Self-Polarizing Electron Ring

Polarized Ion Sources


Anatoly Zelenski (BNL) Polarized Ion Sources

Ralf Hertenberger (Univ. of Munich) A High Brightness Source for Polarized and Unpolarized Negative Hydrogen Beams

Ralf Gebel (Julich) Polarized D- Beams at COSY/Julich



Ralf Gebel (Julich) Polarized D- Beams at COSY/Julich

Pz=0.914+-0.022 new record for polarizationfor proton beamPz=0.764+-0.036 vector polarization for deuteron beam



Ralf Hertenberger (Univ. of Munich) A High Brightness Source for Polarized and Unpolarized Negative Hydrogen Beams

Polarimetry

Maxim Dyug (BINP) Deuteron Target Polarimeter at VEPP-3 Storage Ring

Victor Zhilich (BINP) Moeller Polarimeter for VEPP-3 Storage Ring Based on Internal Polarized Jet

Ivan Nikolaev (BINP) Tuschek Polarimeter for Circulating Electron Beams Rob Kremers (KVI) Design and Measurements With the New Lamb-Shift Polarimeter at KVI Ralf Engels (Forschungszentrum Julich) Nuclear Polarization Measurement of H/D Atoms Extracted from a Storage Cell with a Lamb-shift Polarimeter


Polarimetry

LQP

A - tangstem convertorB - brass baseC - scintillation fibers


Maxim Dyug (BINP) Deuteron Target Polarimeter at VEPP-3 Storage Ring

Polarimetry


Victor Zhilich (BINP) Moeller Polarimeter for VEPP-3 Storage Ring Based on Internal Polarized Jet

Polarimetry


Due to the location near the source

1) Easy investigation of source parameters.

2) Fast production of highly optimized polarized beam.

3) Depolarization studies possible of the accelerator facility.

Due to the principle

4) Atomic cross sections guarantee high accuracy.

Goal : A polarimeter measuring in 30 sec a polarization degree with accuracies of 1%.LSP measurement of a polarized proton beam

Magnetic field [mT]

52 54 56 58 60 62

coun

trat

e [

cou

nts/

sec

]

0

2000

4000

6000

8000

10000

12000

14000Pz = -0.912 +/- 0.009

LSP measurement of a polarized deuterium beam. Signal/ noise = 350

Magnetic field [ mT]

54 55 56 57 58 59 60

Cou

ntra

te [c

ount

s/se

c]

0.0

2.0e+4

4.0e+4

6.0e+4

8.0e+4

1.0e+5

1.2e+5

1.4e+5

Pzz = -1.751 +/- 0.002Pz = -0.006 = +/- 0.05

Rob Kremers (KVI) Design and Measurements With the New Lamb-Shift Polarimeter at KVI

Polarimetry


Nuclear polarization of an extracted atomic beam can be determined with high precisionof about 0.5% within 20 seconds

Pz=0.89 +-0.01 Pz=0.01+-0.01 Pzz=0.89+-0.01

Ralf Engels (Forschungszentrum Julich) Nuclear Polarization Measurement of H/D Atoms Extracted from a Storage Cell Target of ANKE with a Lamb-shift Polarimeter

Photocathods

Yuri Mamaev (SPSPU) Search of Optimal Structure of Photocathode for PES

Oleg Tereshenko (IPS) GaN-(Cs,O) Photocathode For Polarized Electron Source

Dmitry Orlov (MPI NP) Cold Electron Beams From a GaAs-Photocathode.

Svetlana Kulkova (ISPMS) Simulation of Na, K, Cs and Cs(O) Adsorption on GaAs (110) and (100) Surfaces: Towards Predictable Electronic Structure of Activation Layer James Clendenin (SLAC) Status of DULY/SLAC Polarized RF Gun Project


Photocathods

Sergey Starovojtov (SPSPU) Improvement of Strained GaAsP Photocathodes The technique of improvement of Ga-As-P photocathodes in application for laser systems of accelerator was considered.

Vitaly Alperovich (IPS) Polarized Cathodoluminescence in p-GaAs(Cs,O) Induced by Very Low Energy Spin-Polarized Electrons The problem of cathodoluminescence in Ga-As based photocathodes induced by spin-polarized electrons of low energy was discussed. Alexander Terekhov (IPS) Refraction and Subthermal Transverse Energy of Electrons Emitted from GaAs-(Cs,O) The problem of refraction and subthermal transverse energy of electrons emitted from GaAs-(Cs,O) photocathodes. Also the dependence of the angle distributions of electrons on their spin states was considered. James Clendenin (SLAC) Recent Progress at SLAC Extracting High Charge From Highly-Polarized Photocathodes for Future-Collider Applications. The progress in high pulsed current and high polarization degree photocathodes was regarded. The matter is valuable in future colliders application.


Photocathods



Accelerator P, % Beam

MAMI 80-85 QE > 1%

ELSA > 80 6*1011 el/1s pulse

MIT-Bates >80 peak current of up

to 12mA

JLC >90 2*1010el/1 ns pulse

TJNAF >80 <600 A>

Photocathods



High gradient doped strained superlattices InAlGaAs/AlGaAs and GaAs/GaAsP are being developed.

SCL has been overcame.

GaAs/GaAsP gave peak polarization of 85% with

~1% QE and no charge saturation up to 11012 e- in 60 ns.

JLC and SLAC sources are planned to operate with GaAsP strained superlattices.

Photocathods


Until now the best structures are

Strained GaAsP with GaAs quantum well.

Strained InAlGaAs/AlGaAs and GaAs/GaAsP superlattices.

The optimization of InAlGaAs/GaAsP strain-compensated superlattices is underway.

NEA activation process is of crucial importance.


ISTC special session

Yury Shatunov (BINP) (grant ISTC 1928) Construction of VEPP-2000 Electron-Positron Storage Ring

Alexander Ivanov (BINP) (grant ISTC 2569) Accelerator Based Neutron Source for Boron Neutron Capture Therapeutics. Vladimir Tarnetsky (BINP) (grant ISTC 2550) High Power Electron Accelerator

Frank Rathmann (COSY) (grant ISTC 1861) Measurements of the Polarization in H2 and D2 Molecules


The Proceedings of PST2003 will be published as a special issue of Nuclear Instruments and Methods in Physics Research A.


conference photo sponsorship workshop was supported by international committee for high energy spin...

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