ReA12 -Update
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Georg bollen michigan state university

  • ReA12 -Update

Georg BollenMichigan State University

  • D. Leitner, D. Alt, T. M.Baumann, C. Benatti, B. Durickovich, K. Kittimanapun, A. Lapierre, L. Ling-Ying, S. Krause, F. Montes, D. Morrissey, S. Nash, R. Rencsok, A. Rodriguez, C. Sumithrarachchi, S. Steiner, S. Schwarz, M. Syphers, S. Williams, W. Wittmer, X. Wu and others


Facility for rare isotope beams fast stopped and r eaccelerated beams for science

Facility for Rare Isotope BeamsFast, Stopped, and Reaccelerated Beams for Science

ReAccelerator Facility

  • Rare isotope production via in-flight technique with primary beams up to 400 kW, 200 MeV/u uranium

  • Fast, stopped and reaccelerated beam capability

  • NSCL will provide pre-FRIB science opportunities with fast, stopped and reaccelerated beams

  • New equipment must integrate into FRIB in the future

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Frib construction underway

FRIB Construction Underway

  • FRIB project completion in 2022

    • managed to early completion in 2020


Georg bollen michigan state university

NSCL only Facility in the World that ProvidesFast, Stopped, and Reaccelerated Beams of Rare Isotopes

SECAR (design)

JENSA

ANASEN, FSU

SuNCFFDJANUS..

Cycstopper off line commissioning

BECOLA

AT-TPC

20 meter

MoNA

LISA

LEBIT,

Minitrap

Sweeper Magnet

Momentum Compression Beam Line)

ReA3 Hall

K500

Cyclotron

Gas Stopper

ReA6-12

Hall

ReAccelerator Facility

Space for future expansion of the science program

SEETF

K1200

Cyclotron

SeGA

HiRA

Triplex Plunger

CAESAR

LENDA

GRETINA (DOE national user facility)

BCS

NERO

DDAS

CAESAR

S800

A1900 Fragment Separator

RFFS

Gas Stopper

Fast Beams

Stopped beams

Reaccelerated Beams

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


In flight fragmentation offers a wide variety of rare isotopes

In-flight Fragmentation Offers A Wide Variety Of Rare Isotopes

CCF

NSCL’s Coupled Cyclotron Facility has produced >1000 RIBs and >870 RIBs have been used in experiments with > 90% availability

FRIB

FRIB will provide 1000-10000 times higher beam rates


Fast rare isotope beam production at nscl and frib

Fast Rare Isotope Beam Production at NSCL and FRIB

CCF

FRIB

  • 1000x higher primary beam power

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


The reaccelerator rea from fast to stopped to reaccelerated beams

The ReAccelerator (ReA)From fast to stopped to reaccelerated beams

Highly chargedionbeam,

12 keV/u x A

(2≤A/Q≤5)

12 keV/u

600 keV/u

RB

80.5 MHz

b=4.1%

b=8.5%

A few MeV’s/u

Magnetic

sector

Room-temperature RFQ

Superconducting RF linac

Achromatic

Q/A separator

  • Continuous injection (currently) & accumulation (~1 s - 200 ms)

  • Pulsed extraction (~ 1 - 50 Hz)

MHB

Electrostatic

sector

Trapped ions ~ 200 eV

EBIT charge breeder

1+ Q+

≤ 60 keV

**Production & In-flight separation

<1 eV

> 80 MeV/u

Thin foil

target

Initial configuration, ReA3:

He gas-cell

Continuous stable heavy ion beam>80 MeV/u

  • 48Ca 0.3 - 6 MeV/u

    238U 0.3 - 3 MeV/u

“Stopping” area

Finalconfiguration, ReA12

  • 48Ca 0.3 - 20 MeV/u

    238U 0.3 - 12 MeV/u

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Stopped beam facilities ready to deliver beams

Stopped Beam FacilitiesReady to Deliver Beams

Si detector to measure b-decay activity for particle ID & beam transport optimization

  • Purpose of beam stopping:

  • Decelerate the rare-isotope beams

  • Reduce the emittance for reacceleration

Si detectors to measure b-decay activity for particle ID & beam transport optimization

Thermalizaeiosn in gas cellwith helium as a buffer gas

Rare-isotope beams

from the production area

DC beams > 80 MeV/u

DC beams, up to60 keV

Analyzing dipole magnet

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Stopped beam f acilities continuing upgrades

Stopped Beam FacilitiesContinuing Upgrades

  • Multifaceted approach

    • Linear gas stopper (heavier ion beams)

    • Cyclotron gas stopper (lighter ion beams)

    • Solid stopper (certain elements, highest intensity)

  • Cyclotron gas stopper well underway

    • Yoke, poles, coils, cryostat fabricated, stopping chambermanufactured. System assembled

    • Cool down of magnet started

    • Ion transport and extraction techniques demonstrated

  • Cryogenic linear gas stopper

    • Higher beam purity, faster extraction, higher beam rates

    • NSF-MRI funding (information received)

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Georg bollen michigan state university

Re-Accelerator ReAState-Of-The-Art RIB Post-Accelerator and the First Coupled toA Fragmentation Facility

CM1

EBIT CB

RFQ

CM2

SECAR

CM3 (2014)

General Purpose Line

D-Line

N4 Stopped beams

A1900

ReA3

AT-TPC

L-Line

2010/10: RFQ commissioning started

2011/04: CM1 first beam acceleration

2011/06: CM2 first beam acceleration

2012/04: first 1+-n+ acceleration

2013/06: Experimental hall beam line

2013/08: First rare isotope experiment

2014/05: Cryomodule 3 installation

ReA6

ReA6 Equipment & Beamlines TBD

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Rea will provide world unique beams top energies rea3 to rea12

ReA Will Provide World Unique BeamsTop Energies (ReA3 to ReA12)

“n-rich”

“n-deficient”

Measured cavity performance

Original cavity performance

Measured cavity performance

Measured cavity performance

Original cavity performance

ReA energy upgrade continues to be a key user demand

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Rea design choices ebit charge breeder

ReADesign Choices: EBIT Charge Breeder

Achromatic Mass Separator

Pilot source for linac tuning

MHB

0.041 modules

RT RFQ

0.085 module

FY14

n+ RIB beam

EBIT

1+ RIB beam

  • EBIT:

  • Short breeding time

  • High ionization efficiency

  • Charge state flexibility

  • Low beam contamination

  • 0.5 ≥ Q/A ≥ 0.2

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Charge breeding in the ebit source

Charge Breeding In The EBIT Source

Continuous injection and accumulation (~100 ms)

A+

Electron

beam

Magnetic field

Electron

collector

Trap electrodes

Electron

gun

Pulsed extraction (msto ms)

AQ+

Highly charged ions

Radial electron-beam space-charge potential

Axial potential well from the trap electrodes

Lower-the-barrier extraction

Over-the-potential barrier injection

V

V

1+

1+

1+

1

q+

q+

2+

2+

Continuous injection

Pulsed extraction

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Measured charge breeding efficiency

Measured Charge Breeding Efficiency

Efficiency in single charge states of injected 39K stable-isotope beams

ReA EBIT not yet operated at full current

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Improving ebit efficiency with beam bunching

Improving EBIT Efficiency with Beam Bunching

Dynamic capture of ion bunch doesn’t rely on 1+ 2+ charge breeding

  • Continuous injection into EBIT charge breeder

    • Ultimately needed for highest beam intensity (FRIB)

    • 30% efficiency (for all charge states) demonstrated with present electron gun

  • In-flight capture of ion bunches increases efficiency

    • Capture efficiency ecapt= 30% (DC)  ecapt = 100% (pulsed)

    • Higher efficiency for breeding into single charges state

    • Reduced breeding times

  • New beam buncher is under construction

    • Cryogenic cooler and buncher based on gas filled RFQ ion trap

    • Optimized for fast cooling and bunching (<100ms)

    • Optimized for high rate capability (107 ions per bunch  108 ions/s) - compatible with NSCL’s CCF beam rates

  • Status

    • Assembly underway

    • Start commissioning in fall

2013

2014

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Rea design choices rt rfq with external buncher and high efficiency sc linac

ReA Design Choices: RT-RFQ With External Buncher And High Efficiency SC-Linac

Pilot source

Q/A

MHB

0.041 modules

RT RFQ

0.085 module

FY14

n+ RIB beam

EBIT

1+ RIB beam

  • SRF LINAC

    • 80.5 MHz RF frequency

    • Flexible energy range (deceleration 300keV/u to maximum linac energy in small steps

    • External multi harmonic buncher to minimize the longitudinal emittance

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Room temperature radio frequency quadrupole rfq

Room Temperature Radio Frequency Quadrupole (RFQ)

  • Pulsed operation (160kW, 25%)

  • Energy Boost: 12 keV/u - 600 keV/u

  • 4-rod structure, 92 cells, 3.3 m long

  • Buncher : 80.5MHz, 161MHz, (241.5 MHz)

  • Nom 82 % beam capture measured

MHB

Longitudinal acceptance (white area)

Beam bunch after RFQ

Beam at the entrance of RFQ

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Cryomodule 3 makes rea3 complete installation on platform started

Cryomodule 3 Makes ReA3 CompleteInstallation on Platform Started

  • Ten β=0.085 cavities were redesigned to reliably provide high gradient acceleration fields

Cryomodule 3

  • CM4 (FRIB prototype phase I, 2014)

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Reaccelerator testing with p ilot beam

Reaccelerator Testing with Pilot Beam

CM1

EBIT CB

Low Energy Experimental hall

RFQ

CM2

SECAR

CM3 (2014)

First RIB beam delivered

D-Line

N4 Stopped beams

A1900

AT-TPC

Charge Bred Beam

Rb+ → Rb28+

from the EBIT

Pilot Beam

Linac transmission RIB beams ≈ 70%

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Experimental equipment for rea3 installation started in may 2013

Experimental Equipment for ReA3Installation Started in May 2013

At-TPC Line

First radioactive beam experiment with ReA3 (8/2013)

ANASEN Detector

JENSA Gas Jet Target (SECAR)

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Optimizing rea beam time structure investigating different beam scenario with ebit

Optimizing ReABeam Time StructureInvestigating Different Beam Scenario with EBIT

  • EBIT provides flexibility in time structure of extracted beams, ranging from release of very short to long pulses.

  • 2nd EBIT would provide option for near continuous beam.

  • Study of extraction of very short pulses (50 ns) underway

 D. Bazin

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Optimizing rea beam time structure investigating rea bunch spacing options

Optimizing ReABeam Time StructureInvestigating ReA Bunch Spacing Options

 D. Bazin

  • With 80.5 MHz ReA components, bunch spacing is 12.4 ns

  • TOF experiments require larger bunch spacing

  • Designing 16 MHz “pre-buncher”

RFQ

3D EM design of PB electrodes

EBIT

  • Proposing different frequency re-buncher after RFQ or Linac to remove “satellite” bunches

  • Can create continuous 62 ns spacing; a pulsed EBIT in conjunction would allow greater spacing

(Alt, Syphers, et al.)

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Optimizing rea beam time structure investigating rea bunch spacing options1

Optimizing ReABeam Time StructureInvestigating ReA Bunch Spacing Options

  • Very short pulses  50 ns from EBIT

    • No principal show stopper to reach very short pulses (50 ns)

      • Being investigated

      • May require trap electrode optimization

  • Maximizing beam throughput

    • Extraction pulse length determines number of ions

    • Desired repetition rate may not empty EBIT before next injection/breeding cycle

    • May require trap electrode optimization and more sophisticated in trap ion gymnastics

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


Summary

Summary

  • ReA is the first re-accelerator coupled to a fragmentation facility

    • First reaccelerated radioactive ion beam to users was delivered 8/2013

  • Beam stopping commissioned and being upgraded

    • Linear gas catcher (FRIB R&D provided by ANL) operational and improved

    • Cyclotron gas stopper construction underway

    • Linear cryogenic gas cell development scheduled for funding

  • Charge breeding

    • Demonstrated and efficiencies good starting point

    • Parallel approach to further increase efficiencies

      • Adding dedicated cryogenic beam cooler and buncher

      • Increasing current densities

  • Accelerator

    • Better-than-design performance

    • 3rd cryomodule assembled and being installed  ReA3 nears completion

    • Adding more β=0.085 cryomodules will lead to ReA12

  • ReA has significant potential to taylor beam properties to experiment needs

    • Developments are under way

G. Bollen, Recoil Separator for ReA12Workshop, MSU 2014


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