Experimental%20Systems%20at%20the%20ISAC%20Radioactive%20Beams%20Facility

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ISAC II Building March 7, 2003
Experimental Systems at the ISAC Radioactive
Beams Facility
John M. DAuria Simon Fraser University
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Outline

• ISAC I Overview
• Experimental Facilities Present and Planned
• ISAC II Status
• Experimental Facilities Planned
• Future Plans
• Remarks

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The TRIUMF-ISAC Radioactive Beams Facility

• ISAC Project proposed in 1985
• ISAC Project funded in 1995
• RB Production by the ISOL Method
• RB Accelerated using LINACS (0.15 1.5 MeV/u)
• Two Experimental Areas (LEBT and HEBT)
• Major Milestones
• 1998 First RB beam (38mK) to TRINAT
• 2000 First physics (74Rb lifetime with high
  precision)
• 2001 TUDA and DRAGON perform RB experiments
• 2002 - 8? and ?-NMR perform physics
• TITAN and TIGESS Proposed

ISAC II funded
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Production of Radioactive Beams
RIA
ISAC
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Radioactive Beams at TRIUMF The ISOL
Method
M. Dombsky TRIUMF www.triumf.ca/people/marik/

• 500 MeV protons onto thick target
• Have used Ta, SiC, TiC, CaO, CaZrO3, (ZrC)
• Intensities up to 100 ?A possible (now 40)
• Products diffuse out at high temperatures
• Species ionized in surface ion source
• ECR (2003) Laser(2004)

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REMOTE HANDLING for ISAC TARGETS, ION SOURCES
MODULE COMPONENTS
TARGET CONSUMABLE
HOT CELL AND REMOTE CRANE FOR MODULE TARGET
SERVICING
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ISAC I Science Program
ISAC 1 Facilities

Nuclear Astrophysics Fundamental
Symmetries Condensed Matter Physics Nuclear
Structure
DRAGON TUDA TRINAT GPS LTNO Beta NMR 8? Gamma
array RT Collection Station OSAKA Systems
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Experimental Facilities at ISAC Criteria and
Process
-Approved science (EEC) -Approved funding
(NSERC) -Specifications provided by
user -Professional designer/engineer -Reviewed
(all aspects) mechanical electrical control
systems safety -Discussion with other
groups -Approval by Science Director
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TRINAT
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TRINAT
TRIUMF Neutral Atom Trap
John Behr TRIUMF

• Specifications
• -Long development time/university support
• -Lasers and experiment in same room
• Radiation, B field, and acoustically shielded
• Intense, well focused beam

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GPS Facility (General Purpose Spectroscopy)
Gordon Ball TRIUMF
Beta, gamma T1/2,, B.R. High precision
(0.1) Superallowed fermi trans. 74Rb
PRL86(2001)1454
T1/264.710.14 ms
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The 8? Gamma Array at TRIUMF
Greg Hackman TRIUMF
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Detector Reconfiguration
Re-use hemisphere superstructures
Densalloy collimators
BGO inner core was removed
Removable 4 cm Delrin to stop high-energy betas
with minimum Bremsstralung radiation
BGO suppressors now 13 cm from center

• H. Scraggs,
• 60Co source
• ephotpeak 1.5
• P/T 0.41

HPGes 14 cm
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8p Recent Progress

• Jan 2002 8p reconfigured for radioactive ion
• beam (RIB) experiments at ISAC.
• Feb 2002 First Offline Experiment (176Lu).
• Apr 2002 ISAC beamline to 8p complete.
• May 2002 First radioactive beam (26Na).
• June 2002 ROOT online data analysis and
• spectra viewer implemented.
• July 2002 Data acquistion upgrade for RIB
  experiments completed (10 throughput).
• Aug 2002 11Li b-delayed neutron experiment.
• E909 g-liftime test with 26Na beam.
• The 8p is open for business at ISAC!
• (45 collaborators from 12 institutions in 2002)
• Jan 2003 First 8p publication from ISAC,
• Half-Life of 176Lu, G.F.
  Grinyer et al.,
• Phy. Rev. 67, 014302 (2003).

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8p Spectrometer and SCEPTAR
20 plastic scintillators or 10 plastics and 5
Si(Li) detectors
20 Compton-Suppresed HPGe detectors
tape transport
Beam from ISAC
8p
SCEPTAR
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SCEPTAR Progress and Timeline

• Summer 2002 Development and testing of prototype
  detectors and lightguides completed.
• Aug 2002 Detailed technical design and safety
  review completed.
• Fall 2002 Fabrication of 20 detectors and
  lightguides.
• Jan 2003 Assembly of detectors and lightguides.
• Feb 2003 Fabrication of chamber and beamline.
• March 2003 Fabrication of tape system.
• April 2003 Installation and initial beam tests.

8p and SCEPTAR at ISAC-I The worlds premier
facility for high-efficiency b - g -e- decay
studies with short-lived isotopes.
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8? Research Program
E909 Isospin Symmetry Breaking in Superallowed
Fermi Beta Decays E921 High-K Isomers in
Neutron-Rich A 170 190 Nuclei E929 Octupole
Deformation and Spin-Exchange Polarization of
Odd-A Radon Isotopes Toward Radon Electric
Dipole Moment Measurements at ISAC E954 Half-Lives
of Long Lived Isotopes, Chronology and
Environment E955 Probing Shell Structure with b
and b-n-Delayed g Spectroscopy E957 Search for
High-Spin Isomeric States in the Vicinity of
Doubly Magic N Z 100 Sn. E961 A gt 62
Superallowed Fermi Beta Decays Constraining
Unknown Corrections with 66As and 70Br Decay
.
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New data acquisition system

• Needs
• To determine half lives and branching ratios to a
  precision of better than 0.1
• Long term stability
• Time stamping of events
• Dead-time on an event by event basis
• Complete understanding of all systematic
  uncertainties
• High statistics
• Flexibility for future installation of detector
  subsystems
• Plastic scintillator array SCEPTAR for bs
• Si(Li) conversion electron detectors
• Desires
• High through-put, minimal dead time
• Minimal loss
• Make use of many existing components (lower cost)

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Our Solution FERA based system

• Replace pure CAMAC digitizers with FERA (ADCs,
  TDCs, hit pattern registers, latching scalers)
• Cheesecote Mountain FERA driver (Sumner)
• Implement 64 kword VME triple-port memory with
  FERA front-panel input
• Replace CAB with VME front-end
• Replace Differential FIFOs parallel cable with
  Ethernet
• maximum reliable rate before upgrade under 4,000
  Hz
• theoretical maximum now 50,000 Hz
• (upgrade costs shared with LLNL Paul Garrett)

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Results of 26Na runs

• Ran in several modes
• variable (minimized), 27 µs, or 40 µs dead time
• hardware v. software escape suppression
• various rates
• 152Eu or 56Co sources to enhance background
• Even with instantaneous rates of 30,000 triggers
  per second less than 1 in 104 events lost
  between FERA and on-line analyzer
• Detailed analysis underway at Guelph

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Polarized Radioactive Beams
Phil Levy TRIUMF

• Parameters
• Condensed matter
• 8Li
• lt 80 polarization
• 30 transmiss eff.
• ? 107 p/s
• Nuclear physics
• 9,11Li, 20,21,26,28Na
• 50 pol.

Lasers Tisapphire Ring dye Argon-ion
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Beta NMR in Thin Metal Films
Low-energy spin-polarized radioactive beams as a
nano-scale probe of matter
Rob Kiefl UBC
Recent studies Physica B326(2003)213 Physica
B326(2003)189
8Li ?-NMR in Gold foil at 300 K
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Radioactive Targets and Implantation Station
Pierre Bricault TRIUMF Tom Ruth
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LTNO Facility
Paul Delhaij TRIUMF
NMRON Measurement of 60Co in Fe
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DRAGON and TUDA
ISAC LINACS Energy 0.15 1.5 MeV/u Pulse
Iteration 86 ns Masses A lt 30 amu
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ISAC LINACS Energy 0.15 1.5 MeV/u Pulse
Iteration 86 ns Masses A lt 30 amu
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TUDA - TRIUMF University of Edinburgh Detector
Array
21Na(p,p) PRC 65 (2002) 042801
20Na(p,p)
L. Buchmann TRIUMF P. Walden TRIUMF
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Dave Hutcheon Wed.
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21Na(p,?)22Mg
GOAL Measure astrophysical rate at
explosive stellar temperatures (Nova) WHY
Clarify mechanism of nova explosion HOW
Inverse kinematics using 21Na beam PROBLEMS
- Reaction governed by weak resonances -
Requires intense 21Na radioactive beam -
Requires hydrogen gas target - Requires high
beam suppression - Intense gamma background
around target
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Results for 212 Resonance
Thick target yield -only mid point used
Resonance energy Ecm 205.7.5 keV Not 212
keV
Why?
Mass of 22Mg -403.21.3 keV Not 396.8 keV
Elit 214 keV
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Resonance Strength for 5.714 MeV state
Thick target yield
?? 1.03 0.16stat 0.14sys
Accepted Phys Rev Lett March 5, 2003
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Additional Results
21Na(p,g)22Mg at Ecm 821 keV
wg 556 /-77 meV E 821.3 /- 1.9 keV G
16.1 /- 2.8 keV
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Summary Report on E824
21Na(p,?)22Mg

• Received 21Na beam (? 2 x 109600 epA)
• DRAGON operational
• -used DSSSD as focal plane detector
• -used beta activity,FC and elastics for flux
• -used BGO gamma despite high ? bgd.
• Measured ??, ? for resonance at Ecm821 keV
• Measured ?? for resonance at Ecm212 keV
• Measured new mass excess for 22Mg
• Preliminary results (??) from other levels
• - Ecm 336 keV (no coincidences)
• - Ecm 461 keV (?? lt 0.2 meV)
• - Ecm 545 keV (?? 8 meV)
• - Ecm 747 keV (?? 171 meV)

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Plans for ISAC-1 Facilities/Set-ups
Low Field NMR
Sceptar
EDM Test Setup
TITAN
Laser Spectroscopy
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TITAN _at_ ISAC
Highly charged ions for mass measurement in
Penning Trap ISAC Up to three orders of
magnitude gain in sensitivity!

• Mass measurements of isotopes
• T1/2 10 ms
• ??m/m lt 1?10-8
• Operational 2005

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Joe Vaz Thursday
Physics _at_ TITAN
Jens Dilling - TRIUMF

• High precision mass measurements for
  2006
• CKM unitarity test (e.g. 74Rb , t1/2 65 ms,
  needed precision ??m/m lt 1?10-8 )
• Nuclear astrophysics (e.g. Q-value for rp-
  process waiting points)
• Nuclear structure (island of inversion _at_ N 21
  shell closure test _at_ N 26)
• Nuclear models and mass formulae
• Laser spectroscopy 2004
• On cooled bunched beams (behind the RFQ) for
  Nuclear structure
• 177m2Lu (39/2-) predicted 6 min ?
• 134Sn first case above N82 shell closure
• In an RF trap
• 6,7Li for QED tests up to order a4 atomic units.
• 8,9,11Li for nuclear charge radius determination
  (Halo-nuclei).

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TITAN
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Planned/Proposed Experimental Facilities at ISAC
(II)
ISAC II March 7, 2003
ISAC II EXPERIMENTAL HALL From SE Entry Door
Planned Facilities TIGRESS HERACLES BIG
DRAGON TUDA II
123 x 90 x 33 h 11000 ft2
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ISAC-II Stage 1 - 2005
Device Ein Eout A/q Veff
(MeV/u) (MeV/u) (MV)
CSB 0.002 0.002 ?150??30 -
RFQ 0.002 0.153 ? 30 4.5
IH-DTL1 0.153 1.53 ? 6 8.1
SCDTL 0.4 5.7 6 25
0.4 9.8 3 25
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ISAC-II Stage 2 - 2007
Device Ein Eout A/q Veff
(MeV/u) (MeV/u) (MV)
CSB 0.002 0.002 ?150??30 -
RFQ 0.002 0.153 ? 30 4.5
IH-DTL2 0.153 0.4 ? 30 7.5
SCDTL 0.4 6.5 7 42.7
0.4 14 3 42.7
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ECR CHARGE STATE BOOSTER on TRIUMF IS TEST STAND
ION SOURCE TEST STAND
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ISOTOPE ?() ?(ms) a/q
23Na1?8 5 100 2.9
39K1?9 4.6 120 4.3
40Ar1?6 3 75 6.7
59Co1?9 2.8 50 6.5
64Zn1?10 4.1 150 6.4
69Ga1?11 3.6 125 6.3
85Rb1?13 2 80 6.5
88Sr1?14 2 100 6.3
109Ag1?17 5 100 6.4
115In1?18 7.9 70 6.4
120Sn1?19 1.8 ? 6.3
MEASURED CHARGE STATE BOOSTER IONIZATION EFFICIENC
Y CHARGE BOOSTING TIME for RATIOS REQUIRING NO
ADDITIONAL STRIPPING
 
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SCRF Cold Tests

• Tests began April 2002
• Tests support parallel developments of cavity
  performance, rf controls, cryogenic studies,
  cavity preparation, mechanical tuners

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• TRIUMF
• ISAC
• Gamma
• Ray
• Escape
• Suppressed
• Spectrometer

A Next Generation Gamma-Ray Spectrometer for
ISAC-II
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TIGRESS 32-Fold HPGe Prototype

• Collimated 137Cs source shining on Segment 1.
• 50 sequential preamp waveforms from the central
  contact, and segment 1, 2, and 4 outer contacts.

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2
Centre
4
Time in 25 ns steps
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TIGRESS 32-Fold Segmented HPGe Clover Detector
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TIGRESS Modular Compton Suppression Shields
HPGe forward Maximum Efficiency Mode
HPGe back Optimized Suppression Mode
CsI(Tl) Backplug for high-energy g rays
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16-Detector TIGRESS Array at ISAC-II
Optimized Suppression
Maximum Efficiency
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TIGRESS at ISAC
Helen Scraggs Thursday
Carl Svensson Guelph
ISAC I Fundamental Symmetries Superallowed
Fermi b Decays Rn Electric Dipole Moment
searches Nuclear Astrophysics Radiative capture
and transfer reactions with DRAGON and TUDA
2003
ISAC II Nuclear Structure Evolution of Nuclear
Shell Structure Pairing Correlation far from
Stability Mirror Nuclei and Isospin
Symmetry Nuclear Astrophysics Transfer
reactions with BIG-DRAGON Studies of
astrophysically important states Nuclear
Reactions Isospin dependence of nuclear
reaction mechanisms with a CsI(Tl) array
2005
2007
2009
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HERACLES Array at ISAC-II
Nuclear Dynamics Studies Isospin dependence
Light ions, 10-15 MeV/A
R. Roy and L. Beulieau
University of Laval
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Recoil Spectrometerfor ISAC-II(Big Dragon)
VAMOS at SPIRAL
A. Chen and U. Greife
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Highly-Segmented 4p Si Array (TUDA-II)
TUDA at ISAC-I

• Transfer Reactions in inverse kinematics with
  accelerated radioactive beams from ISAC-II.

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TUDA-II
HERACLES
BIG DRAGON
TIGRESS
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THE NEXT 5 YEAR PLAN

• 2005 - 2010
• Draft to be released soon
• Initial review this summer

Key TRIUMF-ISAC Personnel Alan Shotter
Director Jean Michael Poutissou Science
Head Paul Schmor Division Head for
ISAC Pierre Bricault Ass. Div. Head for ISAC
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Concluding remarks
Be clear about the objectives of the
facility Bring team together with common
goal Develop detailed specifications Ensure good
communications between builders and
scientists Maintain close contact with
progress Long term support for university labs
to develop techniques before RIA RIA needs
multiple beam lines

• ISAC is a premier radioactive beams facility
• Available as site for tests and experiments