daniela leitner michigan state university

NSCL Operations and ReAcclerator Facility at MSU

Daniela Leitner Michigan State University

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• NSCL is funded by NSF in support of a versatile user program with a historical average of 4500 hours of operation per year

• Average experiment requires 120 hours of primary beam and multiple rare isotope tunes

•  FY2013: First GRETINA campaign: 5600hr of operation 24 successful experiments (MSU support of $4 M)

• FY2014: 3500 hours scheduled (funding limited)

CCF Operations In Perspective

CFF operations for users is funding limited

Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014

More than 1000 RIBs have been produced and more than 900 RIBs have been used in experiments

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CCF Is The Only Facility In The World That Provides Fast, Stopped, And Reaccelerated Beams Of Rare Isotopes

Science-driven upgrades respond to articulated user needs


Fast Beams Gas Stopper Stopped beams Reaccelerated Beams

Space for future expansion of the science program

ReAccelerator Facility

A1900 Fragment Separator

K1200 Cyclotron

K500 Cyclotron

MoNA LISA

Sweeper Magnet

SECAR (design) JENSA ANASEN, FSU, SuN,

SEETF SeGA HiRA , CAESAR, LENDA, LH2 target

BCS NERO DDAS, CAESAR

RFFS

Momentum Compression ANL Gas Stopper

BECOLA LEBIT

S800

ReA6-12 Hall ReA3 Hall

AT-TPC

Proton detector

20 meter

Triplex Plunger GRETINA (DOE)

Cyclotron Stopper Cryogenic Gas Stopper

Laser Ablation Minitrap SIPT Positron Polarimeter

CFFD, JANUS….

Cooler Buncher Helium Jet

2014- 2016

2011-2013

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–  PAC-38 (Apr. 2014): 30 (of 48) proposals were approved for 4246 hours (6 experiments use reaccelerated beams, 4 use stopped beam facility, 20 use fast beams)

–  New backlog is 6964 hrs

NSCL PAC Statistics

CFF operates well below capacity of 6,000 hours/year (funding limiting)


•  PAC 39 early FY2015 •  Pressure for beam time

will increase in FY2015 when GRETINA will return to NSCL

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Equipment developed and commissioned by users can be used for research with beams from CCF now and later from FRIB

NSF plays a critical stewardship role for maintaining and evolving cutting edge research capabilities and user program while FRIB is built


Production Linac

Target

Fragment Separator (tie into the existing facility

Fast Beams

Stopped and ReAccelerated Beams

In-situ commissioning and first science with beams from CCF FRIB early completion: 12/2020 CD4 6/2022

EBIT CB

RFQ CM2

CM3

CM1

ReA6

SECAR

AT-TPC, …

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NSCL Reaccelerator (ReA) Facility New Opportunity for NSCL Users

ReA3 user program will start late 2014


CCF A1900

> 50 MeV/u Experiments

Cryomodule 5,6 β=8.5%

Cryomodule 4 β=8.5%



CM 1 4.1%

RFQ MHB

Mass separaFon

Gas Stopper

1+ ‒› n+ Future expansion ReA12

ANASEN, SUN, LENDA, SeGA/

CAESAR JENSA Ongoing Developments

Cooler Buncher (2015) ECR injector (2015/16) Prebuncher (2015/16) Rebuncher (2016) Cryogenic Gas Cell (2016/2017) Cycstopper (2016/17)

ANASEN Detector

JENSA Gas Jet Target (SECAR)

ReA3 Hall Commissioned in 2013/2014 ANASEN: 7/2013

AT-TPC: 12/2013 JENSA:

3/3/2014

At-TPC Line

7 Joint DNP Town Meetings on Nuclear Structure and

Nuclear Astrophysics , August 21-23, 2014

Operational Highlight – Reaccelerated Beams First Low Energy Rare Isotope Experiment In The Rea3 Hall (8/2013)

8 Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014

37Cl

13C

Reaccelerated 37K

Energy [A.U.] E

nerg

y L

oss [

A.U

.]

37K produced by CCF and separated by A1900

Linear Gas Cell

Analyzing Magnet

Purity for K-37 ~ 100%

To R

eA

Purity for K-37 ~ 50%

37K+

37K17+

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Installation of Remaining ReA3 Cryomodule

Integrated testing is ongoing, design goals have been demonstrated

Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "

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High Energy LINAC Section ReA6-ReA12 Expansion can be done without interrupting the ReA3 Research Program

Science Case for ReA6-12 is compelling

EBIT CB

RFQ

CM2

CM3

CM1

ReA3

SECAR

AT-TPC

ReA12 Equipment & Beamlines

TBD (user driven)

D-Line N4 Stopped beams A1900

L-Line

ReA3 Low Energy Hall Commissioned 2013/2014

ReA12 High Energy Hall (conceptual design)

JANUS, ANASEN, SuN, CFFD….

AT-TPC

ISLA

GRETINA

Room for Expansion (Higher Energies)

•  Nuclear Structure: E > 6 MeV/u enables the use of the full arsenal of tools for low energy nuclear science, Coulomb Excitation, inelastic reaction, fission, fission barriers, and fusion evaporation reactions ..

•  Surrogate Reactions: Neutron captures •  Astrophysical reactions using ANC technique

Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "

• With adequate Federal funding ReA6 -ReA12 can be built without impacting the ReA3 program − Novel Bottom-Up design (more cost effective, better alignment) − Cavity performance has been demonstrated − ReA3 can be upgraded one module at a time without impacting the science program

Proof of Principle for new ReA6 cryomodule has been progressing with MSU Funding

11"Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "

3.85 W 2K

4K

ReA6 Goal

FRIB (2K)

(2014-proof of principle, 2 Cavities, 1 solenoid)

ReA12 Energy Reach


• NSCL is the nation’s flagship user facility for rare isotope research with new cutting edge capabilities

• Demand for rare isotope beams (fast, stopped, and reaccelerated) is high

• NSCL currently operates well below capacity

• ReA3 provides a world-unique science capability for low energy rare isotope beams, ready for operations

• ReA12 energy upgrade has been a high priority for users with a compelling science case, but requires additional funds

• New instrumentation and tools can use CCF beams for research now and will benefit FRIB science program later

Summary


Back-up

Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 " 14

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ReΑ Concept: 3 Stages


Requirements Ion efficiency for all elements > 20 % EBIT charge breeder + high efficiency

LINAC Beam rate capabilities 108 ions/sec Hybrid EBIS/T charge breeder

High beam purity A1900, EBIT CB, Q/A Low energy spread, short pulse length

1keV/u, 1nsec Multiharmonic external buncher and tight phase control in SRF linac

Q/A

CCF A1900

> 50 MeV/u Experiments

Cryomodule 5,6 β=8.5%




CM 1 4.1% RFQ

MHB

1+→n+

Mass separaFon

Gas Stopper

ReA12 optics design is starting/shielding calculations are being finalized for the accelerator


Energy spread requirements Bunch lengths requirements Bunch spacing

-4 -2 0 2 4-4

-2

0

2

4Real Space

X (mm)

Y (m

rad)

-4 -2 0 2 40

100

200

300

400Horizontal plane

X (mm)

N

0 100 200 300 400-4

-2

0

2

4Vertical plane

Y (m

m)

N

12MeV/u Transverse Phase space

• Nominal pulse structure for 80.5 MHz is 12.54 nsec • Currently exploring the option of pre-buncher between EBIT & RFQ

– Prebunching the beam using 16.1MHz buncher (62.5 nsec spacing)

Time structure from ReA


0

100

200

300

400

500

600

700

880 890 900 910 920 930 940 950

Cou

nts

(arb

.uni

t)

nsec

FWHM0.52 nsec

12.54 nsec

-0.1 -0.05 0 0.05 0.1-20

-10

0

10

20Longitudinal: Energy& Time

T (ns)

DEk(

keV/

u)

-0.1 -0.05 0 0.05 0.10

500

1000

1500

2000Bunch Length

T (ns)

N

0 500 1000 1500 2000-20

-10

0

10

20Energy Spread

DEk(

keV/

u)

N

Longitudinal Phase Plot ReA12

daniela leitner michigan state university

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