Mass separation and mass measurement capabilities ...

A study of the accuracy of PILGRIM, a future MR-tof3 MS for the S Low-Energy 3 Branch ( S -LEB ) at Ganil Blaise-Mal RETAILLEAU Glasgow, 1/08/2018 Contributors : J.F. Cam, P. Chauveau, P. Delahaye, V. Manea, L. Schweikhard, P. Ujic and C. Vandamme Table of content 1.Introduction 2.Online Mass resolution and precision 3.Offline Mass resolution and precision 4.Perspectives and conclusion INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 2 Introduction Physics case Workbench description Bunch description Physic case th 0 3 y, a d s e u T o d

o e h t nc n e ra s e Pr S. F by ly u J The scientific goals focus on the study of ground-state properties of the N=Z nuclei up to the doublymagic 100Sn and R = m/m = t/2/t 100 000 of the~ few10 very m/m = 1/(R.2,35.sqrt(m)) ~ few10m/m =those 1/(R.2,35.sqrt(m)) heavy and -7 INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 4 PILGRIM working principle M CP Electrostatic mirors

BradburyNilson gate Pulse Drift Tube Alkalin Source Colim ator Photograph Courtesy : R. N. Wolf (University of Greifswald), modified by B-M. Retailleau (Normandie University, GANIL) INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 5 Initial Bunch shape FWHM = 42,77 ns Tof-Mean Uncertainty All ion distribution at the entrance of PILGRIM have a FWHM ~43 ns tof-Mean = t INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 6 Online mass resolution and precision Resolution in function of laps number Mass resolution and precision Time of flight fluctuations Mass resolution of 39K depending of

the number of laps We use K for his high statistic 39 = = 2. Resolution 140000 1000 laps Mass Resolution 120000 100000 80000 FWHM = 74,45 ns 60000 40000 ~3-10 min / points 20000 0 0.00 200.00 400.00 600.00

800.00 1000.00 1200.00 1400.00 1600.00 Number of Laps INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 8 Online mass resolution on 39K, 85Rb 87 Acq time > 8h and Rb Direct mass resolution of PILGRIM for isotope separation 39 85 87 R b 699 23 833 K Time of flight (ns) 15 958 384 R b 230 23 558 FWHM (ns) 119,33

164,50 181,19 Resolution 66 865 71 606 65 772 INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 9 Time of flight fluctuations 39K Mean 15,958,440.00 15,958,420.00 Dividing run into 9 cycles of 3000 ions on MCP Time of flight (ns) 15,958,400.00 15,958,380.00 15,958,360.00 94 ns 15,958,340.00 15,958,320.00 15,958,300.00 15,958,280.00 Using 39K and 85Rb with least +

= in functionto of cycle squaresParameters method find the two parameters : Cycle Number = 85Rb Mean Offset 3.911510000E-04 3.911505000E-04 3.911500000E-04 3.911495000E-04 2.00 3.00 4.00 5.00 6.00 7.00 8.00 -7.2000E-02 9.00 -7.4000E-02 -7.6000E-02

-7.8000E-02 -8.0000E-02 -8.2000E-02 -8.4000E-02 3.911490000E-04 -8.6000E-02 3.911485000E-04 -8.8000E-02 3.911480000E-04 -9.0000E-02 Weighted Mean 23,558,350.00 23,558,300.00 Time of flight (ns) 3.911520000E-04 1.00 3.911515000E-04 a : Slope coefficient Cycle Number Standard Error 23,558,250.00 Standard Error 23,558,200.00 Bias

Slope Coeff 139 ns 23,558,150.00 23,558,100.00 23,558,050.00 Number INPC 2019 A study of accuracy ofCycle PILGRIM B-M. RETAILLEAU 10 Online mass precision Determination of 39K,85Rb and 87Rb masses using + = least squares method on linear function 25.000000 Error of measured masses a b Measure Mass Mass uncertainty Error keV 39 85 87 K R

R 0,00039115040(5) 0,00039115045(2) 0,00039115045(2) b -0,082(1) b -0,082(1) -0,082(1) 36 293 942 keV 79 094 341 keV 80 954 890 keV 16,27 keV 29,35 keV 34,75 keV 9,63 keV 20,81 keV 11,95 keV preliminary Error mass in keV 20.000000 15.000000 10.000000 5.000000 0.000000 38K 85Rb Elements Error mass 87Rb Tabulated Mass

INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 11 Online results with 39 Tabulated Mass (keV) FWHM (ns) Resolution K Measured Mass (keV) Mass uncertainties (keV) Error mass (keV) 39 85 R K, 85 Rb and 133 Cs 133 Cs 36 293 952 71,89 110 997

79 094 320 b 103,40 113 918 123 800 134 138,65 106 287 36 293 955 13 4 79 094 312 20 8 123 800 105 34 29 INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 12 Comparaison Time of flight fluctuations The first run is 8h 39min long Time of flight fluctuations on 85Rb 23,558,350.00 The second run is 14h 9min long Time of flight (ns) 23,558,300.00

23,558,250.00 139 ns 23,558,200.00 70 ns Mean 1st run Mean 2nd run 23,558,150.00 23,558,100.00 The Online resolution of PILGRIM is 23,558,050.00 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 Cycle Number INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 13

Offline measurements Improving mass resolution Mass precision Offline measurement ; mass 85 resolution of Rb Cycling run for increasing mass resolution Cycle number Sigma Resolution 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 9,00 76,14 49,52 61,45 38,55 42,64 40,55 27,45 50,86 56,61 66 600,82 102 402,73 82 522,19 131 543,40 118 925,97 125 055,72 184 736,29 99 705,22 89 577,89 Average resolution of 111 230 85

R b Group number 3,00 6,00 Sigma 40,30 32,03 Resolution 124 376,51 156 489,93 9,00 12,00 15,00 18,00 21,00 24,00 27,00 30,00 35,08 37,09 28,61 35,25 44,00 35,00 35,97 32,83 142 884,16 135 140,88 175 196,90 142 195,35 113 917,84 143 210,72 139 348,78 152 676,68 Average resolution of 137 0764 85 R INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 15 Mass precision for the first run

Mass Measurment of 85Rb 79094340.00 79094320.00 Measued mass (keV) Determination of the mass of 85Rb using weighted average on 1st run 79094360.00 79094300.00 79094280.00 79094260.00 79094240.00 79094220.00 79094200.00 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00

Cycle number Mesured Mass Cycle number Mesured mass (keV) Uncertainty meas. Mass 1,00 79094281 67,11 2,00 79094320 38,46 Average uncertainty = 11,85 keV 3,00 79094352 35,87 4,00 79094320 28,38 Weighted av. 5,00 79094323 51,79 Mass precision ~ 1,5 10-7 Tabulated Mass 6,00 79094323 28,23 Mass Uncertainty

7,00 79094321 26,96 Mass Uncertainty 8,00 79094310 32,58 9,00 79094261 62,50 Average error = 0,79 keV INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 16 Measured mass (keV) Mass precision for the second run Mass Measurement of 85Rb using weighted average 79094430.00 Determination of the mass of 85Rb using weighted average on 2nd run 79094410.00 79094390.00 79094370.00 79094350.00 79094330.00 79094310.00 79094290.00 79094270.00 79094250.00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. Tabulated Mass Group number Mesured mass (keV) Uncertainty Mass meas. 3,00 79094327 6,00 79094320 9,00 79094327 30,48 31,56 30,23 Average uncertainty = 5,82 keV Mesured Mass Cycle Number Weighted av. 12,00 15,00 18,00 21,00 79094303 79094335 79094305 79094295 29,87 30,74

Mass precision ~ 7,36 10-8 33,12 31,24 Mass Uncertainty Mass Uncertainty 24,00 27,00 30,00 79094312 79094305 79094318 30,15 29,06 30,44 Average error = 7,29 keV INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 17 Conclusion and perspective We perform online mass resolution up to 120 000 We find mass precision down to 12 keV with a good accuracy X We have fluctuations which can degrade mass resolution and we need to control it X Limit in mass precision still to be determined, work in progress We must look for the origin of the instabilities on the set-up In the future we plan to make tests using RFQ cooler buncher instead of alkaline source INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 18

Thanks for your attention End Bad bunch from Bradbury-Nilson gate FWHM = 96,88 ns Bad BNG timing INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 20 Time of flight focus Time of flight focus is done for 750 laps But we find a bigger tail FWHM = 59,10 ns INPC 2019 A study of accuracy of PILGRIM B-M. RETAILLEAU 21

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