The Accelerator System for ReA3 the New Re-accelerated RIBs Facility at MSU

Transcription

1 The Accelerator System for ReA3 the New Re-accelerated RIBs Facility at MSU Xiaoyu Wu National Superconducting Cyclotron Laboratory Michigan State University on behalf of the NSCL ReA3 team X. Wu, Cyclotrons 21, 9/9/21, Slide 1

2 Acknowledgements Accelerator R&D O. Kester F. Marti M. Doleans C. Compton W. Hartung L. Popielarski J. Popielarski J. Wlodarczak Q. Zhao C. Benatti G. Perdikakis Mechanical Engineering D. Lawton J. Ottarson M. Johnson J. Wenstrom Nuclear Physics D. Bazin G. Bollen S. Schwarz J. Yurkon F. Montes Special thanks to B. Laxdal and colleagues from TRIUMF Facility/Operation D. Sanderson A. Zeller S. Chouhan J. Bierwagen S. Bricker N. Verhanovitz M. Portillo J. Delauter P. Miller G. Machicoane D. Cole Electronics J. Vincent K. Davidson N. Usher K. Holland X. Wu, Cyclotrons 21, 9/9/21, Slide 2

3 Production of RIBs by Projectile Fragmentation at NSCL ReA3 X. Wu, Cyclotrons 21, 9/9/21, Slide 3

4 NSCL Present Facility Layout X. Wu, Cyclotrons 21, 9/9/21, Slide 4

5 Facility for Rare Isotope Beams (FRIB) >2 MeV/u for all ions 4kW Superconducting driver linac Three-stage fragmentation separator Successfully passed DOE CD-1 review To be completed in ~218 X. Wu, Cyclotrons 21, 9/9/21, Slide 5

6 ReA3 Connections to CCF and FRIB ReA3 will be operated as a radioactive beam reaccelerator for the Coupled Cyclotron Facility in the coming years ReA3 will be operated as a radioactive beam reaccelerator for FRIB once the FRIB driver linac is operational and replaces the coupled cyclotrons ReA3 shares similar technology as the FRIB driver linac Low energy beam lines for ion beams RFQ SRF linac ReA3 will provide valuable experience to FRIB for tuning strategies, particularly for SRF linac phasing strategy and development of beam tuning applications X. Wu, Cyclotrons 21, 9/9/21, Slide 6

7 ReA3 platform Q/A-Separator 12 kev/u LEBT RFQ 6 kev/u Higher energies for lighter ions Minimum energy spread 1keV Minimum pulse length 1 ns SRF-linac EBIT charge breeder HEBT Modern ion linac: LEBT with multi-harmonic buncher Radio frequency quadrupole (RFQ) Superconducting RF linac HEBT with rebuncher 238 U.3 3 MeV/u 48 Ca.3 6 MeV/u X. Wu, Cyclotrons 21, 9/9/21, Slide 7

8 ReA3 platform Q/A EBIT RFQ SRF X. Wu, Cyclotrons 21, 9/9/21, Slide 8

9 ReA3 hardware EBIT Charge Breeder Q/A Separator SC Linac LEBT RFQ HEBT X. Wu, Cyclotrons 21, 9/9/21, Slide 9

10 ReA3 EBIT charge breeder Unique features: Continuous injection of ions» high capture rate Variable extraction duty cycle» μs pulse to quasi-continuous Short breeding time (<1 ms) High efficiency > 5% in a single charge state EBIT installation will be completed in October, Simulations are performed to optimize performance, Injection tests end of 21! X. Wu, Cyclotrons 21, 9/9/21, Slide 1

11 Achromatic Q/A-separator Energy collimation slit Resolving power > 1 Beam from EBIT Mass separation slit X. Wu, Cyclotrons 21, 9/9/21, Slide 11

12 Low energy beam transport (LEBT) Stable Ion Source ( 4 He 1+ ) E-Quads Multi-harmonic buncher Triple-Bender X. Wu, Cyclotrons 21, 9/9/21, Slide 12

13 Beam Diagnostics (LEBT) Faraday cup CaF viewer MCP viewer Bunch length monitor Attenuators 45 deg. slit RFQ X. Wu, Cyclotrons 21, 9/9/21, Slide 13

14 Emittance Scans RFQ transverse acceptance > ε n = 1. π-mm-mrad ε g = 2 π-mm-mrad (@ RFQ input energy of 12 kev/u ) Desired twiss parameters α =.6 and β =.6 m Measured beam emittances fit into RFQ transverse acceptance X. Wu, Cyclotrons 21, 9/9/21, Slide 14

15 RT 4-rod 4 RFQ rods (milled from Cu profiles) stem tuning plate New design: Al-tank (no copper plating required) Simple adjustment of tuning plates, no alignment required High power operation RFQ installed in beam line, Conditioning started, Beam tests in September 21! X. Wu, Cyclotrons 21, 9/9/21, Slide 15

16 ReA3 SRF-cryomodules ReA3-3 ReA3 Cryomodules 15 cavities 2 cavity types (QWR) Beta=.41 &.85 Same as FRIB design 8 solenoids Same as used in FRIB First two cryomodules completed, third in progress to be completed Q2FY211 re-buncher β =.41 module β =.85 module X. Wu, Cyclotrons 21, 9/9/21, Slide 16

17 SRF-LINAC infrastructure Clean rooms Lead shield diagnostic boxes X. Wu, Cyclotrons 21, 9/9/21, Slide 17

18 Building cryomodules! Clean room assembly of cold mass required! Cryogenic Distribution System Cold-mass ReA3 Cryomodule Vacuum Vessel ReA3 design Performance tests of cavities and solenoids. Thermal Shield C.K. Gelbke, 9/15/21, Slide 18

19 ReA3 QWRs testing β opt =.41 β opt =.85 Q Q ReA3 FRIB SC236 (BB) SC24 (Ja) SC241 (Ch) SC237 (Fr) SC243 (Dr) SC245 (Nm) SC244 (PH) E p (MV/m) ReA3 FRIB Generation 1st (RIA) 2nd (SC247 Jk) E p (MV/m) X. Wu, Cyclotrons 21, 9/9/21, Slide 19

20 ReA3 High Energy Beam Transport (HEBT) Beam dynamics design completed Design of Re-buncher cryomodule started Completed end of 211 Beam dynamics design completed Mechanical design of S-bend completed Magnets in production Completed end of 21 ReA3 Platform β=.41 QWR Re-buncher X. Wu, Cyclotrons 21, 9/9/21, Slide 2

21 ReA3 Facility Layout Q/A Separator LEBT+RFQ SC Linac EBIT ReA3 Experimental Hall ReA3 Platform HEBT X. Wu, Cyclotrons 21, 9/9/21, Slide 21

22 Strong interests using ReA3 RIBs for nuclear astrophysics experiments ANSEN SeGA CAESAR AT-TPC JENSA SECAR X. Wu, Cyclotrons 21, 9/9/21, Slide 22

23 ReA3 Beam Simulations 4 Energy Ek (MeV/u) Z (m) Beam Envelope 4 Rmax (mm) Z (m) X. Wu, Cyclotrons 21, 9/9/21, Slide 23

24 ReA3 Beam Simulations Erms(x/y) (pi mm-mrad) E995(x/y) (pi mm-mrad) Z (m) Transverse 99.5% emittances Transverse rms emittances Erms(x) Erms(y) E995(x) E995(y) Z (m) Erms(z) (pi kev/u-ns) E995(z) (pi kev/u-ns) Longitudinal rms emittance Z (m) Longitudinal 99.5% emittance Z (m) X. Wu, Cyclotrons 21, 9/9/21, Slide 24

25 ReA3 Beam Simulations 5 5 X (mm) Real Space X (mm) Y (mm) Longitudinal Phase Space Horizontal plane Vertical plane N Phase (degree@8.5mhz) -5 5 X (mm) Bunch length N -5 N N Py (mrad) Y (mrad) Vertical Phase Space 1 DW/W (%) Px (mrad) Horizontal Phase Space Y (mm) Energy spread Time (ns) dek (kev/u) 2 X. Wu, Cyclotrons 21, 9/9/21, Slide 25

26 ReA3 to ReA6 Upgrade β=.85 QWR Re-buncher β=.41qwr Re-buncher β=.85 QWR Accelerating Cryomodule X. Wu, Cyclotrons 21, 9/9/21, Slide 26

27 ReA6 Facility Layout Q/A Separator LEBT+RFQ EBIT SC Linac ReA3 Experimental Hall ReA3 Platform HEBT HEBT X. Wu, Cyclotrons 21, 9/9/21, Slide 27

28 ReA6 to ReA12 Upgrade ReA6 ReA12 β=.85 QWR Re-buncher β=.85 QWR Accelerating Cryomodule ReA3 SRF LINAC on platform X. Wu, Cyclotrons 21, 9/9/21, Slide 28

29 Re-Accelerator Energy Increase with Additional Cryomodules X. Wu, Cyclotrons 21, 9/9/21, Slide 29

30 NSCL Pre-FRIB (216) Facility Layout X. Wu, Cyclotrons 21, 9/9/21, Slide 3

31 Fast, Stopped, and Re-accelerated RIBs at NSCL with FRIB RIBs from FRIB X. Wu, Cyclotrons 21, 9/9/21, Slide 31

32 Summary ReA3 status Test of EBIT electron beam system done, magnet commissioned, assembly ongoing first operation October Q/A-separator beam commissioning completed LEBT beam commissioning is presently performed RFQ tuning completed, conditioning ongoing, first beam tests in early September 21 SRF-linac: re-buncher rf-tests completed, first beam tests in conjunction with RFQ beam commissioning β=.41 module installed, hardware tests are being performed β=.85 under construction Accelerated stable beams end of 21 Reaccelerated beams in 211 X. Wu, Cyclotrons 21, 9/9/21, Slide 32