TRIµP Laser Spectroscopy:Status and Future

U Dammalapati

TRIP Facility

Lasers forNa -decay Ra Spectroscopy & EDM

Towards cooling of Heavy Alkaline Earth Elements

Outlook

Production

Target

RFQ

Cooler

Optical

Trap

Beyond

The

Standard

Model

TeV Physics

TRIP FacilityAGOR Magnetic

Separator

Atomic Physics

Nuclear Physics

Particle Physics

Energy:

MeV eV neV

Ion

Catcher

keV

Separator commissioning SuccessfulA Rogachevskiy

RFQ prototype test and simulationsE Traykov

Charge exchange at low energiesL Willmann

G P Berg, U Dammalapati, P G Dendooven, O Dermois, G Ebberink, M N Harakeh, R Hoekstra, L Huisman, K Jungmann, H Kiewiet, R Morgenstern, G Onderwater, A Rogachevskiy, M Sanchez-Vega, M Sohani,M Stokroos, R Timmermans, E Traykov, L Willmann and H W Wilschut

TRIµP – Trapped Radioactive Isotopes: µ-laboratories for fundamental Physics

• - angular correlations in nuclear -decay• Suitable isotope 21Na

p, q 1MeV/c 260

a.u.

Erecoil = (p + q)2/2Mrecoil

100 eV 3.6 a.u.

p

q

J

Double differential decay probability:

Na -decay

Violation of T-Symmetry

H= -(d.E+µ.B)d - EDMµ - magnetic dipole momentI - Nuclear spin

Limit for nuclear EDM Hgd< 2.1 x 10–28 e cm

M. V. Romalis et al. Phys.Rev.Lett. 86, 2505 (2001)

Radium: Excellent candidateV. A. Dzuba et al. Phys. Rev.A61 062509(2000)

EDMs violate- Parity- Time Reversal

Radium Atomic Structure

482.7 nm

714 nm

7s2 1S0

7s 7p 1P1

7s 7p 3P

7s 6d 1D2

7s 6d 3D1

23

2

10

1438 nm1488 nm

2.8 m

Energy level data:E. Rasmussen, Z. Phys. 86, 24 (1933) and 87, 607 (1934); H.N. Russel, Phys. Rev. 46, 989 (1934)

Calculations done by K Pachuki and Flaumbam, Dzuba et al.

• Lifetime measurement• Energy level spacing• Hyperfine structure• Needed for atomic structure calculations

Spectroscopy of P and D states

Heavy Alkaline Earth Element: Barium

– 8.4nsecIs=14mW/cm2

1 2

3

• Life time measurement• Hyperfine structure• Laser cooling of barium• Develop trapping strategy

791.3 nm

6s2 1S0

6s 6p 1P1

6s 5d 1D2

6s 6p 3P210

1130 nm

1499 nm

6s 5d 3D

3 m1108 nm

– 1.4 µsecIs=30µW/cm2

553.7 nm

Spectroscopy of P and D states

Verdi pumpat 532 nm

Collimator

Ba Oven500C

PD

M1

BS

Dye Laser

PowerStabilization

PMT

AOM

Optical fiber from 791.3 nm diode laser

553.7 nm

Coherent 699Single mode dye laser

B

/2

138 B

a

137 B

a F

=5 /

213

7 Ba

F=

5 /2

138 B

a

135 B

a13

6 Ba

in Polarization plane

Polarization plane

Fluorescence at 553.7 nm from different Ba isotopes

Cou

nts

[k

Hz]

PMT

PMT

Cou

nts

[k

Hz]

Frequency [MHz]

Frequency [MHz]

Hanle effect

Life time of 1P1 state

Plaser B field

eff = h/(2 gJ B1/2)

eff = 8 nsec 0.5sec

138Ba 136Ba

138Ba 136Ba

Cou

nts

[k

Hz]

Cou

nts

[k

Hz]

Cou

nts

[k

Hz]

Cou

nts

[k

Hz]

Magnetic Field [G]

Magnetic Field [G]

Magnetic Field [G]

Magnetic Field [G]

0 100 200 300 400 5000

20

40

60

Grou

nd St

ate D

eplet

ion [%

]

Power [W]

553.7 nm

791.3 nm

6s2 1S0

6s 6p 1P1

6s 6p 3P1

6s 5d 3D

3 m

1.4 µsec

8.4 nsec

40%

60%

Creation of intense beam of meta-stable D-state atoms

321

Intercombination line 1S0–3P1

-0.010 -0.005 0.000 0.005-2

-1

0

1

2

Iodi

ne S

igna

l

k + 12636.6632 cm-1 [cm-1]

FM Saturated absorption spectroscopy of I2

DiodeLaser791.3 nm

I2 Oven

(560ºC)

M1

M3BS

BSPD

Lock-InAmp

FeedbackControl

VCO

/4 AOM

To Beat note

Lock point

Reference Line P(52)(0-15) transition

f=f0+f1 Sin(wt)

w=90.5kHz

599 MHz away from 1S0–3P1 in 138Ba

390 400 410 420 430 500 510 520 530 540

0.7

0.8

0.9

1.0

1.1 138Ba136Ba

Dep

leti

on

[%

]

Offset Frequency to I2 reference Line [MHz]

Hyperfine Splitting of 1S0–3P1 transition in an External Magnetic field

= gJ µ mJ B

IS = 138Ba–136Ba= 108.5 (3) MHz

2.3 MHz

Outlook

• Diode Laser for 1P1–1D2 transition @1500nm and for 1P1–3D2 and 1P1–3D1 transitions @1130&1108nm)

Towards Radium• Laser @482.5nm for 1S0–1P1 transition by frequency doubling Ti:Sapp Laser• Production of Radium at TRIµP by end of 2004• Spectroscopy in a Radium beam

Laser Cooling of Barium

Producing light for Ra 1S0-1P1 transiton

• Second harmonic generation in linear cavity using KNbO3 (b-cut, 19°) 3 or

5mm; temperature tunable and high efficiency

• Wavelength tunable from 480 nm (10°C) to 490 nm (40°C)

M1

M2

Telescope

BS

SplitPD

PD

PZT

R=-50mm, HR485 nm & 970 nm

Faraday Isolator

Ti:Sapp

Dichroic MirrorKNb03

HR AR

Blue output