ELENA, CRYRING, or FLAIR ELENA, CRYRING, or FLAIR D. Fischer, R. - - PowerPoint PPT Presentation

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ELENA, CRYRING, or FLAIR ELENA, CRYRING, or FLAIR D. Fischer, R. - - PowerPoint PPT Presentation

Mar 03, 2023 208 likes •458 views

The ReMi Experiment at The ReMi Experiment at ELENA, CRYRING, or FLAIR ELENA, CRYRING, or FLAIR D. Fischer, R. Moshammer (Heidelberg), Ulrik Uggerhj, Helge Knudsen (Aarhus), Masaki Hori (Munich), Yasunori Yamazaki, Yasuyuki Matsuda, Naofumi

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SLIDE 1
  • D. Fischer, R. Moshammer (Heidelberg), Ulrik Uggerhøj, Helge Knudsen

(Aarhus), Masaki Hori (Munich), Yasunori Yamazaki, Yasuyuki Matsuda, Naofumi Kuroda (Tokyo), Michael Charlton (Swansea) et al.

The ReMi Experiment at ELENA, CRYRING, or FLAIR The ReMi Experiment at ELENA, CRYRING, or FLAIR

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SLIDE 2

(Sub-)femtosecond correlated dynamics probed with antiprotons

  • D. Fischer, R. Moshammer (Heidelberg), Ulrik Uggerhøj, Helge Knudsen

(Aarhus), Masaki Hori (Munich), Yasunori Yamazaki, Yasuyuki Matsuda (Tokyo), Naofumi Kuroda (Tokyo), Michael Charlton (Swansea) et al.

The ReMi Experiment at ELENA, CRYRING, or FLAIR The ReMi Experiment at ELENA, CRYRING, or FLAIR

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SLIDE 3

Sub-Femtosecond Correlated Dynamics

Atom: t ≈ 20 as I = 1016 W/cm2

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SLIDE 4

Sub-Femtosecond Correlated Dynamics

Atom: t ≈ 20 as I = 1016 W/cm2 Half-cycle pulses: t ~ 5 fs … 1 as I = 1016 W/cm2

Collisions:

  • vary the interaction strength
  • vary (and access) ultra-short

interaction times

  • vary the charge sign
  • Chance for rigorous theory
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SLIDE 5

Femtosecond Correlated Dynamics

Atom: t ≈ 20 as I = 1016 W/cm2 Half-cycle pulses: t ~ 5 fs … 1 as I = 1016 W/cm2

Collisions:

positive ion

  • p impact

a unique and the only tool!

  • e- impact

ionization threshold

  • ion impact

electron transfer / quasi-molecules

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SLIDE 6

Total cross sections of single ionization of helium in slow antiproton collisions: THEORY in the year 1994

. 2 . 4 . 6 . 8 1 . 1 1 1 1 1

E n e r g y [ k e V ] C r

  • s

s s e c t i

  • n

[ 1

  • 1

6

c m

2

]

C D W

  • E

I S F a i n s t e i n ( 9 4 ) C T M C S c h u l t z e t a l ( 8 9 )

1 fs … 0.3 fs … 0.1 fs … 30 as time

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SLIDE 7

0.2 0.4 0.6 0.8 1.0 1 10 100 1000 10000

2C PWBA: Das et al (97) CDW-EIS: Fainstein (94) CTMC: Schultz (89) TDCC Foster et al (08) MEAOCC-3: Sahoo et al (05) MEAOCC-2 Igarashi et al (04) IPM-BGM-RESP-2: Keim et al (03) LTDSE: Schultz and Krstic (03) TDDFT/OEP-SIC: Tong et al (02) IPM-BGM-RESP-1: Kirchner et al (02) MEAOCC-1: Lee et al (00) MEHC: Bent et al (98) MFIM, 7 cuts: Reading et al (97) IEV: Wehrman et al (96) IPM: wehrman et al (96)

Energy [keV] Cross section [10

  • 16 cm

2]

Total cross sections of single ionization of helium in slow antiproton collisions: THEORY in the year 2008

1 fs … 0.3 fs … 0.1 fs … 30 as time

slide-8
SLIDE 8

Knudsen et al PRL 101, 043201 (08)

Total cross sections of single ionization of helium in slow antiproton collisions: THEORY in the year 2008

0.2 0.4 0.6 0.8 1.0 1 10 100 1000 10000

CERN (08) CERN (94) CERN (90) 2C PWBA: Das et al (97) CDW-EIS: Fainstein (94) CTMC: Schultz (89) TDCC Foster et al (08) MEAOCC-3: Sahoo et al (05) MEAOCC-2 Igarashi et al (04) IPM-BGM-RESP-2: Keim et al (03) LTDSE: Schultz and Krstic (03) TDDFT/OEP-SIC: Tong et al (02) IPM-BGM-RESP-1: Kirchner et al (02) MEAOCC-1: Lee et al (00) MEHC: Bent et al (98) MFIM, 7 cuts: Reading et al (97) IEV: Wehrman et al (96) IPM: wehrman et al (96)

Energy [keV] Cross section [10

  • 16 cm

2]

1 fs … 0.3 fs … 0.1 fs … 30 as time

Benchmark system for ionization in the presence of correlation Ultimately: fully differential!

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SLIDE 9

gas jet projectile beam recoil ion recoil ion electron

Reaction Microscopes

The “Cloud-Chamber” of atomic and molecular physics

Fragmentation kinematically complete and in 3D

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SLIDE 10

Knudsen et al PRL 101, 043201 (08)

Total cross sections of single ionization of helium in slow antiproton collisions: THEORY in the year 2008

0.2 0.4 0.6 0.8 1.0 1 10 100 1000 10000

CERN (08) CERN (94) CERN (90) 2C PWBA: Das et al (97) CDW-EIS: Fainstein (94) CTMC: Schultz (89) TDCC Foster et al (08) MEAOCC-3: Sahoo et al (05) MEAOCC-2 Igarashi et al (04) IPM-BGM-RESP-2: Keim et al (03) LTDSE: Schultz and Krstic (03) TDDFT/OEP-SIC: Tong et al (02) IPM-BGM-RESP-1: Kirchner et al (02) MEAOCC-1: Lee et al (00) MEHC: Bent et al (98) MFIM, 7 cuts: Reading et al (97) IEV: Wehrman et al (96) IPM: wehrman et al (96)

Energy [keV] Cross section [10

  • 16 cm

2]

1 fs … 0.3 fs … 0.1 fs … 30 as time At high energies: perturbative limit

  • all theories converge
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SLIDE 11

|𝜔atom |𝜔cont incoming (plane) wave |𝜒P = 𝑓−𝑗𝑞

0𝑆

Theory: 1st Born

Cross section (Born series): d𝜏 = 8𝜌𝜃2

𝑟3 𝜔cont

𝑔

𝑓−𝑗𝑟∙𝑠

𝜔atom 𝑗 2d𝑟 + ℴ 𝜃3

Perturbation parameter: 𝜃 =

𝑎P 𝑤P

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SLIDE 12

𝑟 𝑤 proj

Fully differential cross section d3𝜏 d𝐹 d𝑟 dΩe 1.2 GeV C6+ + He η = 0.1

  • M. Schulz, …, DF et al.

Nature 422, 48 (2003)

𝑟 = 0.75 a.u.

CDW-EIS, D. Madison et al.

Cross section (Born series): d𝜏 = 8𝜌𝜃2

𝑟3 𝜔cont

𝑔

𝑓−𝑗𝑟∙𝑠

𝜔atom 𝑗 2d𝑟 + ℴ 𝜃3

Perturbation parameter: 𝜃 =

𝑎P 𝑤P

Fully differential cross sections for ions

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SLIDE 13

1.2 GeV C6+ + He η = 0.1

  • M. Schulz, …, D. Fischer et al.

Nature 422, 48 (2003)

𝑟 = 0.75 a.u. Theory: CP, M. McGovern et al. PRA 81, 042704 (2010) TDCC, J. Colgan et al., JPB 44, 175205 (2011)

Fully differential cross sections for ions

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SLIDE 14

incoming (plane) wave 𝜇 = 2𝜌 𝑁𝑄𝑤𝑄 scattered wave

What goes wrong?

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SLIDE 15

many source points many frequencies incoherent wave

Projectile mass and coherence

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SLIDE 16

many source points many frequencies incoherent wave

the coherence length 𝜀⊥ is the maximum slit distance still resulting in an interference pattern

𝜀⊥ ∆𝑞⊥= 𝜌 𝜀⊥ ≈ 10−3a.u. in the 1.2 GeV C6+ experiment

Projectile mass and coherence

Effects were observed for ion-molecule collisions

(K.N. Egodapitiya, et al., PRL 106, 153202 (2011))

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SLIDE 17

increase of 𝜀⊥ = 𝜌 ∆𝑞⊥

e- beam ion beam

ion storage ring TSR electron cooling:

Projectile coherence

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SLIDE 18

0° 30° 60° 90° 120° 150° 180° 210° 240° 270° 300° 330°

1.2 GeV C6+ (𝜀⊥ ≈ 10−3a.u.) CDW-EIS for 1.2 GeV C6+ 3 MeV protons (𝜀⊥ ≈ 3 a.u.) CDW-EIS for 3 MeV protons

  • X. Wang, ..., D. Fischer, JPB (FTC) 45, 211001 (2013)

Projectile coherence

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SLIDE 19

incoherent wave

Select small impact parameters 𝑐:

16 MeV O7+ (𝜀⊥ ≈ 0.35 a.u.) incoherent (Δ𝑐 > 𝜀⊥, single ionization) Coherent (Δ𝑐 < 𝜀⊥, transfer ionization)

0° 30° 60° 90° 120° 150° 180° 210° 240° 270° 300° 330°

  • K. Schneider, ..., DF, PRL 110, 113201 (2013)

Projectile coherence

transfer ionization ∆𝑐

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SLIDE 20

Projectile coherence

  • Experimental evidence of projectile coherence

effects on the cross section

  • that implies that scattering cross sections

depend on the way, how the projectile is prepared? … but further research is required to  include the coherence length in a QM model  Measure cross section as a function of coherence length (in one experiment)

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SLIDE 21

500 keV Theories, pbar-He, McGovern et al. (09):

  • First Born Appr. (grid)
  • Coupled Pseudostates (surface)

But what to expect for antiprotons?

60 keV 3keV

  • Are there differences between p and pbar at high energies?
  • What is the correlated dynamics at low energies?
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SLIDE 22

ELENA machine section 1

  • F. Butin / ELENA collaboration

1569 mm From http://indico.cern.ch/event/280768/session/2/contribution/8/material/slides/1.pdf Space for the REMI

Energy 100 keV Vacuum 3E-12 Torr beam emittance εxy 3 mm mrad beam diameter

  • typ. 3mm

pulse duration >50 ns number of injected pbars ca 1E7 intensity (directly after decceleration) 1E12 pbars/s

  • 1. New setup with new design
  • 2. No fully differential cross sections
  • 3. No very low energies
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SLIDE 23

The in-ring MOTReMi in CRYRING

CRYRING:

  • Protons, highly charged ions, antiprotons …
  • Energies ≥ 300 keV

Future perspective: A ReMi in the USR@FLAIR  Talk by C. Welsch

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SLIDE 24

Daniel Fischer Johannes Goullon Renate Hubele Hannes Lindenblatt Katharina Schneider Michael Schuricke Shaofeng Zhang Xincheng Wang

Collaboration

MPIK:

Robert Moshammer Alexander Voitkiv Bennaceur Najjari Joachim Ullrich (now PTB) …

MST, Rolla, Missouri:

Michael Schulz

Aarhus University:

Helge Knudsen Ulrik Uggerhoej

MPQ, Munich:

Masaki Hori