ISAC Science Forum - TRIUMF Science... · 2009. 3. 18. · ISAC Science Forum: Wednesday, August 20th, 2008 at 15:15 in the ISAC-II Conference Room The schedule for the meeting will

ISAC Science Forum: Wednesday, August 20th, 2008 at 15:15 in the ISAC-II Conference Room The schedule for the meeting will be as follows: * reports on finished/on-going and up-coming experiment: * EDM (Mike Hayden -SFU) * beta-NMR (Gerald Morris) * TRINAT (John Behr) * status actinide test (Colin Morton) * fall schedule discussion (G. Ball) * supernanogan and CSB installation and commissioning plan (F. Ames) * aob

Gordon Ball,1 John Behr,1 Tim Chupp,2 Celia Cunningham,2 Greg Demand,3

Martin Djongolov,1 Paul Finley,3 Adam Garnsworthy,1 Paul Garrette,3 Katie Green,3

Greg Hackman,1Mike Hayden,4 Carolyn Kierans,1,4 Jamie Kilkenny,1

Wolfgang Lorenzon,2Matthew Pearson,1 Tim Raben,2 Evan Rand,3

Chandana Sumithrarachchi,3 Carl Svensson,3 Eric Tardiff,2 Smarajit Tirambak,1

Scott Williams,1 Jan Zirnstein2

1TRIUMF2University of Michigan3University of Guelph

4Simon Fraser University

S929 Rn Electric Dipole Moment

Search at ISAC: Progress Report

Hayden / ISAC Science Forum / Aug 20, 2008

Spokesmen: T. Chupp and C. Svensson

Requested: 8 shifts of 121Cs & 123Cs with intensities ~106 s-1

(decay to 121Xe,123Xe)

Basis: beams of 1.3 × 106 s-1 and 5.6 × 107 s-1 previously

demonstrated at ISAC for 121Cs & 123Cs from Ta

production targets and surface ion sources

Objective: collect, manipulate, and polarize 121Xe & 123Xe

(surrogates for Rn isotopes)

Received: 123gCs: 1.2×106 s-1 & 123mCs: 6.2×104 s-1

→ 123Xe: τ½ ~ 2 hrs, J=1/2

121gCs: 7.8×103 s-1 & 121mCs: 6.2×104 s-1 Low!

→ 121Xe: τ½ ~ 40 min, J=5/2


REDM

Rn EDM location

at ISAC-I

Goal#1: commission ILE1 beamline extension to RnEDM


implant Cs

(decays to Xe)

heat foil to

release Xe and …

… cryopump Xe

to coldfinger

1

2

3

4 warm coldfinger

and ‘push’ into

cell using N2 gas

5 close valve, and start

next collection cycle

Goal#2: test and refine collection & transfer of Xe


Transfer Efficiency(Coldfinger and Push)

• Transfer Xe by

cryopumping directly

into cell

• Warm up cell and

cryopump Xe to

coldfinger

• Push Xe back into cell

using N2 gas

Preliminary

Preliminary

Preliminary

Preliminary


Study Xe Adsorption to Surfaces

0.0085 0.0090 0.0095 0.0100 0.0105 0.0110 0.01150.01

0.1

1

123Xe on Stainless Steel

(Tcell/T

CF)1/2 RCF/R

cell

1/T (1/K)

preliminary result: EB=2.75(15) x 10

3 K

Preliminary

Preliminary

Tcell = 77K

cell

coldfingerTCF > Tcell

HPGe

(Rcell)

HPGe

(RCF)



Goal#3: incorporate spin-exchange optical pumping &

polarization of 121Xe; measure γ-ray emission anisotropies

cell B, M

HPGe

HPGe

Laser (on/off 10 min period)


Started with 123Xe because of low 121Xe rates (~ 18hrs)

Finished run with 121Xe (~ 12 hrs)

Goal#3: incorporate spin-exchange optical pumping &

polarization of 121Xe; measure γ-ray emission anisotropies

Entire sequence (cool coldfinger, heat foil, collect Xe,

warm coldfinger, push into cell, start optical pumping)

accomplished in under 10 minutes

time →off

on

off

on

off

on

offγasymmetry

Hints of γ-ray asymmetries for 121Xe, but not yet conclusive

β+-assymetry for 123Xe ?

Detailed analyses underway

Preliminary

Preliminary


Summary

beamline commissioning

efficient and rapid transfer of noble gas to cell

polarize and detect asymmetries?

statistics limited by 121Cs

production rate

Next Steps (using Cs →Xe)

study polarization buildup and decay

detect free precession signal

optimize design for sensitivity to β+ asymmetry

S1127 Search for Exotic Massive Particles in decay oftrapped isomers

Search for anything massive emittedfrom nuclear transition, independentof interaction in detector or lifetime• Statistical sensitivity ∼ 10 � 6branch per day of counting

photo−ionizing

778 nm

E= 0 V/cm E= 3 V/cm

6 cm

e−+Rb

γ

18.025.0

6− 1.0 m

2−

Rb86

556 keV

Behr for Kong, Chatwin-Davies, Gorelov, Murray, Pearson

Neutral daughter atom has 1.9 eV kinetic energy:photoionization scheme

Thibault PRC 1981: we agree withtheir isotope shifts in trappingtransitions :)

��

��

��

�

< 1250nm

5P

5D

Rb I5S

778 nm

778 nm


We need the unknown S to D transition of the 86Rbground state

• Yield insufficient to hunt fortransition on the decaying atoms(estimate ∼ 1/minute onresonance)• We realized (9 p.m. Tuesday) wecould trap the 18-day 86gRb andmeasure the 2-photon yield on thetrapped atoms• Then we took several hours ofdata on 86mRb decay with thelasers fixed at that frequency. Wemay find in the analysis that wehave demonstrated our technique.


summaries

• Trapped several 1,000 atoms 86mRbTrapped several 10,000 atoms 86gRb and measured neededisotope shift in S to D two-photon transitionTook 3 hours data in final night in full experimental mode withfrequencies optimized.• Yield of 86mRb was 6x106/sec for most of run.Yield declined 20% yesterday after one proton trip, thendropped linearly to 3x10**6/sec at end of run• Those of us who are here and those of us who are sleeping(like Tao Kong, Ph.D. student) thank everyone for the extra dayof beam where we made critical progress


Actinide Target Development – ISAC Science Forum, August 20, 2008 A.C. Morton

The plan:

• First test run with a UOx target • Limited currents:

o ~1 A o 300 A•hrs total – total potential radiological hazard

comparable to 30,000 A•hrs on Ta or Nb

• Originally scheduled to start today; delayed until next week – license and entrance module

The run:

• Stage 1: 0—100 A•hrs (~8 shifts) o No extraction

o Rad. safety measurements at 50, 100 A•hrs • Stage 2: 100—300 A•hrs (~16 shifts)

o Extraction and delivery to yield station

o Yield measurements of selected alkalis o Rad. safety measurements at 150, 300 A•hrs

• Need CNSC “concurrence” to proceed to Stage 2

Status:

• Monitoring and controls:

o Radiation monitoring upgrades completed o Some controls work still in progress

• Target:

o Entrance module repaired and replaced o TM1 to fly to ITW August 21

• Licence:

o Hearing (in Ottawa) August 22 [Incorrectly reported as “tomorrow” in the meeting – ACM] – not public

Status and Commissioning Planfor the

ISAC Charge State Breeder (CSB)

Friedhelm Ames, TRIUMF, August 20, 2008

B(m0)

B(m(Emax))

B(z)

z

1+ n+

rf

B)E(m

qcrf =ω=ω

PHOENIX ECR source:

3cm1210...1110en

keV730maxET25.1maxB

T52.0)0m(BGHz5.14rf

−=

=⇒=

=⇒=ν

Electron Cyclotron Resonance Ion Source (ECRIS)

charge breeder results from the test stand

Measurements with ions from standard ISAC ion sources

Element Mass

Charge state with maximum efficiency (A/Q)

Efficiency (%)

rise time (90%) for charge state with maximum efficiency (ms)

1+ ion source

Ar

Kr

Xe

K

Rb

Cs

ECR1025.58+ (5)40

84 ECR

129

401

39

6.3

85/87

12+ (7)

17+ (7.6) 432

9+ (4.3)

13+ (6.5)

4.8

2.1

133 20+ (6.7)

3

3.5

230

300

ECR

surface

surface

surface + testsource

•emittance of Csn+ measured < 20 π mm mrad @ 15 kV

installation in ISAC mass separator room

Statusmechanical installation finishedservices installation finishedvacuum finishedcontrols not finished scheduled end of Sept.rf not tested scheduled end of Sept.

August 14, first test on the injection of ions from ISAC into the CSB failedinvestigation of reasons is going on

PlanComissioning of charge breeding with Cs test ion sourceNew injection test from ISAC scheduled for October 30

End of shut-down 2008

Status and Commissioning Planfor the

OLIS SUPERNANOGAN ECR ion source

Friedhelm Ames, TRIUMF, August 20, 2008

SUPERNANOGAN ECR ion source

permanent magnet6-14.5 GHzsputtering targets and ovens for nongaseous elements

should provide stable highly charged ion beamsas pilot beams for CSB or directly for experiments

ION H+ He+ He2+ C4+ O6+ Ar4+ Ar8+ Ar9+ Ar11+ Xe25+ Au30+

I eµA 1000 1000 500 200 200 300 200 80 30 10 1

Implementation in existing OLIS cage

microwave source

surface source

SUPERNANOGAN

gas inlet and control system

source cart in OLIS HV cage

Schedule for final installation and commissioning (draft)

ISAC Science Forum_Aug 20 2008.docEDM_M. Hayden.pdfTRINAT_J. Behr.pdfActinide Test_C. Morton.pdfCSB_F. Ames.pdf

Documents

ISAC Science Forum - TRIUMF Science... · 2009. 3. 18. · ISAC Science Forum: Wednesday, August 20th, 2008 at 15:15 in the ISAC-II Conference Room The schedule for the meeting will