Workshop summary PSTP2011

Workshop summaryWorkshop summary PSTP2011 PSTP2011

Workshop SummaryDmitriy Toporkov 1

Dmitriy Toporkov Workshop Summary

International spin physics committee:

Steffens E., Erlangen (Chair) Roser T., BNL (Past-Chair) Milner R.G., MIT (Chair-Elect)

Anselmino M., Torino Belov A.S., INR Bradamante F. *, Trieste

Courant E.D. *, BNL Crabb D.G. *, Virginia Gao H., Duke

Efremov A.V., JINR Fidecaro G. *, CERN Haeberli W. *, Wisconsin

Imai K., Kyoto Krisch A.D., Michigan Lenisa P., INFN

Mallot G., CERN Masaike A. *, Kyoto van Oers W.T.H. *, Manitoba

Poelker M., JLAB Prepost R., Wisconsin Prescott C.Y. *, SLAC

Saito N., KEK Sakai H., Tokyo Soergel V. *, Heidelberg

Stephenson E.J., Indiana Stroher H., COSY Tyurin N.E., IHEP

* Honorary Members

PSTP2011PSTP2011Scientific sessionsScientific sessions

Session 1: Polarized electron sources (chair E. Tsentalovich)6 TalksSession 2: Polarimetry (chair: Y. Makdisi)5 TalksSession 3: Polarized internal targets, ABS (chair D. Toporkov)4 TalksSession 4: Polarized ion sources (chair A. Belov)3 TalksSession 5: Prospects of polarized experiments (chair E. Steffens)5 TalksSession 6: Polarized solid targets (chair D. Crabb)6 Talks

Dmitriy Toporkov Workshop Summary

Dmitriy Toporkov Workshop Summary 4

Status of Spin Physics and Experiments

Erhard SteffensUniversity of Erlangen-Nürnberg

Chair, International Committee for Spin Physics Symposia

Diffraction

DIS Material science with pol. neutrons

Nucl. structure

Spin structure

SPIN TOOL

S

Spin tools are discussed in detail at Workshops (regular or topical)


Polarized electron sources

Eric J. Riehn, BNL


Period Dependence of Time Response of Period Dependence of Time Response of Strained Semiconductor SuperlatticesStrained Semiconductor Superlattices

Leonid G. Gerchikov State Polytechnic University, St. Petersburg, Russia

Partial electron localization leads to non-exponential decay of pulse response. Analysis of pulse response allows to determine the characteristic times of capture and detachment processes. Partial electron localization decreases considerably the diffusion length in SL Partial electron localization limits QE for thick working layer. For practical application one should employ SL photocathodes with no more than 10 – 12 periods.



Status of high intensity polarized electron gun project at MIT-Bates

Evgeni Tsentalovich, MIT

Current status The gun chamber: built and tested. It was vented 3 weeks ago to install the first dipole followed the gate valve and 2 additional NEGs. Rebaked and HV reprocessed. The preparation chamber: design is completed, the main chamber has been manufactured, many parts are already ordered. Load lock – the design is in progress. Beam line – conceptual design is completed, some parts are designed, the dipole vacuum chambers have been manufactured.

0

0.2

0.4

0.6

0.8

1

-6 -4 -2 0 2 4 6

R,mm


Marcus Wagner


Commissioning results of the SRF gun with Pb cathode R. Barday, HZB

few hunderd nm thick Pb cathode film

Energy Recovery Linac BERLinPro

Development of the SRF gun in a staged approach

Beam energy 50 MeV

Average current 100 mA

Bunch charge 77 pC

Normalized emittance <1 mm mrad

Repetition rate 1.3 GHz


Polarimetry

Polarized beam in RHIC in Run 2011.Polarimetry at RHIC A.Zelenski, BNL

Faraday rotation polarimeter Lamb-shift polarimeter 200 MeV - absolute polarimeter AGS p-Carbon CNI polarimeter RHIC p-Carbon CNI polarimeter RHIC - absolute H-jet

polarimeter Local polarimeters at STAR and PHENIX

H-jet is an ideal polarimeter !

High (~4.5%) analyzing power in a wide energy range (23-250 GeV).

High event rate due to high intensity (~100 mA) circulated beam current in the storage ring (~6% statistical accuracy in one 8hrs. long fill


Source, Linac, AGS-injector polarimetrs.Hjet:

Absolute polarization measurements Absolute normalization for other RHIC Polarimeters

pC: Separate for blue and yellow beamsNormalization from HJetPolarization vs. time in a fillPolarization profileFill-by-fill polarizations for experiments

PHENIX and STAR Local Polarimeters: Monitor spin direction (through transverse spin component) at collisionPolarization vs time in a fill (for trans. pol. beams)Polarization vs bunch (for trans. pol. beams)

Polarized beams in RHICA.Zelenski, BNL


Extra Physics with an Atomic Beam Source and a Lamb-Shift Polarimeter

Ralf Engels, JCHP / Institut für Kernphysik, FZ Jülich

PIT@ANKEBound β decay Precision Spectroscopy of H and D Polarized Molecules


Proton Polarimetry at the Relativistic Heavy Ion Collider and Future Upgrades

Yousef I. Makdisi, Brookhaven National LaboratoryFor the RHIC Polarimetry Group

Weak (if any) energy dependence pp elastic scattering in CNI region is ideal for polarimetry in wide beam energy range

24 GeV: PRD 79, 094014(2009)31 GeV: Preliminary100 GeV: PLB 638 (2006) 450250 GeV: Preliminary

Weak energy dependence pC elastic scattering in CNI region is good for polarimetry in wide beam energy range

31 GeV 100 GeV 250 GeV


Systematic Errors Studies in the RHIC/AGS Proton-Carbon CNI PolarimetersAndrei Poblaguev, Brookhaven National Laboratory

• Different types of detectors were tested in the Run 2011• Results of polarization measurements were consistent within 1-2% accuracy• No significant variation of the results of measurements were observed during the whole 4 month run.• The polarimeter has a capability to measure analyzing power up to the arbitrary normalization factor, but accurate study of the systematic errors is needed for that.• Standard energy calibration method was found to be unreliable, new method of calibration are suggested but more development is still needed.• Experimental evaluation of the rate effect is consistent with estimation of pileup contribution.• More accurate control of energy losses in the target is needed.

summary


POLARIZED INTERNAL TARGETS and ABSStorage cells for internal experimentswith Atomic Beam

Source at the COSY storage ringKirill Grigoryev Institut für Kernphysik, Forschungszentrum Jülich, GermanyPetersburg Nuclear Physics Institute, Gatchina, Russia

dimensions 15x20x370 (140+230) mm3

material 25μm Al + 5μm Teflon

Atomic hydrogen target density - 1.34 · 1013 at/cm2

Openable storage cell configuration: dimensions 11x11x390 (190+200) mm3

material 25μm Al + 5μm Teflon Fixed storage cell configuration:

Expected atomic hydrogen target - 4.7 · 1013 at/cm2


A.Belov, INR RAS


Possibility to obtain a polarized hydrogen molecular target

D. Toporkov BINP, Novosibirsk, RussiaD. Toporkov BINP, Novosibirsk, Russia

Suggested source of polarized molecules

Intensities of polarized beams from the Atomic Beam sources seems have reached it’s limit of about 1017at/sec.

Proposed source of polarized ortho-hydrogen (o-H2 ) molecules probably will provide intensity by order of magnitude higher.

An opening questions are preservation of polarizationof molecules under injection into the storage cell and realization of huge differential pumping system neededto get good vacuum condition.

Summarry


Modification of the Pumping System of the Polarized Atomic Beam Source (ABS)at the ANKE facility in COSY- Jülich

Viplav Gupta, IKP/Jülich, Jülich Center for Hadron Physics, FZJülich,Germany

• Installation at a test chamber

• All components tested successfully

• Pressure achieved in the system ≈ 3*10-8 mbar

Current Status

All 3 cryogenic pumps are to be replaced by 4 turbomolecular pumps made available from previous experiments


POLARIZED ION SOURCESHigh-Intensity Polarized H- Beam production in Charge-exchange CollisionsA.Zelenski, BNL

Atomic H injector produces an order of magnitude higher brightness beam thanpresent ECR source. A 5-10 mA polarized H- ion current (50-100 mA proton current) can be obtained for the smaller (higher brightness) beam. The basic limitation on the production ofthe high-intensity (~300 mA) , high-brightnessunpolarized H- ion beam in charge – exchange collisions will be also studied.

Higher polarization is expected with the fast atomic beam source due to:

a) elimination of neutralization in residual hydrogen; b) better Sona-transition efficiency for the smaller diameter beam; c) use of higher ionizer field (up to 3.0 kG), while still keeping the beam emittance below 2.0 π mm∙mrad, due to the smaller beam diameter.

All these factors combined will further increase polarization in the pulsed OPPIS to over 85%.


Status of the Source of Polarized Ions for the JINR accelerator complex

V.V. Fimushkin Joint Institute for Nuclear Research, Dubna

colider 2CT- 534 (C

Ring = 534 m)July 2010

The new flagship JINR project in high energy nuclear physics, NICA

(Nuclotron-based Ion Collider fAcility), aimed at the study of phase

transitions instrongly interacting nuclear matter at the highest possible

baryon density, was put forward in 2006

Charge-exchange plasma

ionizer hard ware status70%ready

Extraction chamber hard ware status

ready

ABS hard ware statusready

Intensive work on preparation of the ABS for tests iscarried out at INR of RAS (Moscow) Operating tests of the ABS systems are planned in 2011 The first tests of the SPI charge-exchange ionizer atJINR are planned in 2011 also


A.Holler, Julich


Yu.Kiselev

Prospects of polarized experiments


Precursor experiments to search forpermanent electric dipole Moments (EDMs) of protons and deuterons at COSY

Frank Rathmann, Juelich.

A permanent EDM of a fundamental particle violates both parity (P) and time reversal symmetry (T).Assuming CPT to hold, the combined symmetry CP is violated as well.

Next step: • Scrutinize potential of different Principal Experiments

Systematic error estimates for all PEs require reliable spin tracking tools.

Top priority to make them available ASAP!• Identify PE with best systematic limit on dp,d.

PE 1: Use a combination of a snake and RF fieldsPE 2: Dual Beam Method (equivalent to g-2 d) for p and dPE 3: Resonance Method with RF E-fieldsPE 4: Resonance Method of EDM Measurements in SR


A possible way to measure the deuteron EDM at COSYN.Nikolaev (IKP FZJ & Landau Inst)

The deuteron EDM < 1 E-24 e cm is within the reach of COSY supplemented by RFE-flipper running at approx. 5 % of the ring frequency Similar upper bound is feasible for the proton An obviously long way from an ideal ring to the real thing plagued by systematics But there is an in situ access to sytematics via the magnetic moment of the deuteron (proton...)

A magic storage ring for protons (electrostatic), deuterons, …

“Freeze“ horizontal spin precession; watchfor development of a vertical component !


First experiments with the polarized internal gas target at ANKE/COSY

Maxim Mikirtychyants for the ANKE collaboration FZ Jülich / JCHP and PNPI (Gatchina)What makes the difference in positive and negative polarization?

Target performanceReliable operationHigh target densityHigh polarization

PolarimetryOnline HFT tuning using the LSPOnline data analysis procedure

InstrumentsPoint-like target (jet)Unpolarized Gas Supply System (background measurements)

Summary


DOUBLE POLARIZED DD-FUSION

P. Kravtsov, Petersburg Nuclear Physics Institute, Gatchina, Russia

ABS

LSP

dd-polarimeteror LSP

Ion source

n , p

(2.4 MeV)(3.0 MeV)

3 2+

3 +He , H

(0.8 MeV)(1.0 MeV)

d+ (1-32 keV)

d+

d0 (0.1 eV)

d0 (0.1 eV)

++++

®++

++

epH

enHedd

3

230

rr

Polarized Atomic Beam Sourcebased on ABS(from Cologne University)I 1Target densityVector polarization: 0.7

SAPIS project

~ ∙ 10 a/s ~ 10 a/cm

±

16

211

Polarized Ion Sourcebased on POLIS source(

≤( 3 )

≤

KVI, Groningen)Ion beam: I 20 A1. ∙ 10 d/s

E 32 keV

μ14

beam

Vector polarization: 0.7±

Lamb-Shift Polarimeter

Wien filter

Starting experiment 2012-2013


Perspectives for Polarized AntiprotonsPaolo Lenisa, Università di Ferrara and INFN – ITALY, on behalf of the PAX-Collaboration

September 2011 ongoing beamtime:

II Ring polarization studiesI. Measurement of polarization lifetime: P>105sII. Measurement of spin-flip efficiency: =0.987

WASA

e-cooler

ANKE

PAX


Polarized solid targetPNPI polarized target for pion-nucleon scattering measurements at intermediate energies

D.V. Novinsky Petersburg Nuclear Physics Institute, Gatchina, Leningrad district, 188350, Russia

method of proton magnetic resonance (PMR),polarization pump by the dynamic nuclear orientation method up to absolute value 70–80% measurements are based on the calculations of square under the PMR curve: the system containing Q-meter with sequential contour and signal digitalizationCalibration is based on the equilibrium state at temperature 0.8 – 1.4 K

Successful target work > 20 years Modernization and new tests are requiredNew physics tasks

In memory of A.I. Kovalev (1936-2011)


Alexander Berlin, Ruhr Universitat Bochum

Conclusion


G.Reicherz


The polarized solid target for the cristal ball experiment at MAMIA.Thomas


Development of polarized HD target for LEPS experimentsHideki Kohri , RCNP Osaka University Japan

Purity of HD ： about 99%Temperature ： T = 14 mK Magnetic Field ： B = 17 TeslaAging time : 53 daysExpected Polarization ：　 80%(H)Measured Polarization ： 40%(H)Measured relaxation time (T1) : 100 days

First production of polarized HD target(2008Nov-2009Jan We are developing a polarized HD target.

We tried to produce the polarized HD target in 2009. Although the polarization degree was small(40%), the relaxation time was long enough for LEPS experiments.

We developed new NMR system, gas analyzer system, and gas distillation system for future production of polarized HD target. These systems are working well. We plan to carry out an experiment using polarized HD target in the next year.

We constructed a new beam-line (LEPS2) at SPring-8. The BNL/E949 spectrometer will be transported to SPring-8 in this year.

Summary and future plan


Polarized solid 3He target created by the brute force method for medical useMasayoshi Tanaka, Department of Clinical Technology, Kobe Tokiwa University, Kobe, Japan

To reduce the risk arising from the radiation This is our motivation to start the “NSI” (Nuclear Spin Imaging ) - MRI with the Hyperpolarized Nuclei. Basically, the NSI uses a polarizer and conventional MRI, no need for constructing a new device except for the polarizer itself.

I. Practical use of hyperpolarized 3He-MRI for medical diagnosis:1) Basic study on lung, e.g., ventilation Time dependence

2) Medical diagnosis for COPD (Chronic Obstructive Pulmonary

Disease) with ADC (Apparent Diffusion Coefficient) etc.

Future prospect

ConclusionThe technical part of the first step, i.e. experimental verification of production of the hyperpolarized 3He is on going.


I would like to thank to the members of Program Committee who help me a lot during the preparation of the program

Alexander BelovRalf Engels

Frank RathmannErhard Steffens

Masayoshi TanakaEugeni Tsentalovich

Final remarkFinal remark

Workshop SummaryDmitriy Toporkov 36

We had an excellent week with inspiring talks and discussions.Alexander and the organizers did a fantastic job!Many thanks to the Local organizing committee:

Alexander Vasilyev Mariya MarusinaEugeniya Brui Peter Kravtsov Kirill Grigoriev

Documents

Workshop summary PSTP2011