Fragment Mass Analyzer Argonne N.L.

Transcription

1 Fragment Mass Analyzer Argonne N.L. Version from 09/11/2015 Link: Separator ANL FMA extended configuration Documentation FMA files location Optics Optimization Angular Acceptance Momentum Acceptance Experiment 32 S (115 MeV) + 58 Ni Open questions OT, 09/14/15, East Lansing 1

2 FMA documentation sources COSY file with FMA settings example kindly provided by Darek Seweryniak (ANL) OT, 09/14/15, East Lansing 2

3 FMA files LISE ++ package LISE ++ file FMA extended for the reaction 32 S(115MeV)+ 58 Ni(0.4 mg/cm 2 ) Recommended! LISE ++ configuration FMA extended configuration OT, 09/14/15, East Lansing 3

4 FMA optics settings OT, 09/14/15, East Lansing 4

5 FMA aperture and slit settings slits apertures These aperture parameters are used to obtain angular and momentum acceptances of the separator. This settings list can be produced in LISE ++ using menu Experimental Settings -> Optics -> Optics settings: View and Print OT, 09/14/15, East Lansing 5

6 FMA optics LISE ++ does not provide information for mass dispersion So, this value can not be used for optimization constraint Quad values have been taken from COSY optimization All matrices have been calculated inside LISE ++ Final global matrices obtained with LISE ++ COSY OT, 09/14/15, East Lansing 6

7 FMA optics Will be zoomed on the next page zero angular dispersion Almost zero angular dispersion OT, 09/14/15, East Lansing 7

8 FMA 1 st order matrix elements (zoom) vertical focus FP double focus, double achromatic OT, 09/14/15, East Lansing 8

9 Attempt to optimize FMA optics without mass dispersion; keeping work after that with COSY Quad values Optics fit was good. All constraints done! But no more any dispersion in the final focal plane including charge dispersion See right plots for this optics, and compare with the previous page OT, 09/14/15, East Lansing 9

10 Angular Acceptance See details for angular acceptance with the next link Settings Coming to the FP Initial emittance gated on the final focal plane Beam dialog Monte Carlo options Monte Carlo Transmission settings Angular acceptance is equal to ±41.2 x ±41.4 mrad, that corresponds to 5.36 msr OT, 09/14/15, East Lansing 10

11 Angular Acceptance : Results X Intensity lost Y OT, 09/14/15, East Lansing 11

12 Angular Acceptances transmission benchmarks Distribution method With set Angular Acceptances Monte Carlo method With set Angular Acceptances No bounds Monte Carlo method No Angular Acceptances WITH bounds OT, 09/14/15, East Lansing 12

13 Momentum Acceptance Intensity lost Corresponds to the Dipole X-aperture ± 100 mm P/P = ± 7.05 % ( E/E = ± 14.1 %) OT, 09/14/15, East Lansing 13

14 FMA acceptances benchmark Emittance corresponding to the acceptances Distribution method With set Angular Acceptances Monte Carlo method; No Angular Acceptances; WITH bounds Transmission 77.3% OT, 09/14/15, East Lansing 14

15 Charge state selection Analytical solution Very thin target for charge state simulation Monte Carlo solution OT, 09/14/15, East Lansing 15

16 Envelopes : LISE ++ Monte Carlo solution NIM B70 (1992) 358 LISE ++ OT, 09/14/15, East Lansing 16

17 Envelopes : LISE ++ analytical solution NIM B70 (1992) 358 LISE ++ X X Y Y OT, 09/14/15, East Lansing 17

18 Experiment 32 S (115 MeV) + 58 Ni NIM B70 (1992) 358 Target LISE ++ settings File: FMA_32S_58Ni.lpp Beam Production mechanism OT, 09/14/15, East Lansing 18

19 Experiment 32 S (115 MeV) + 58 Ni : fusion-residue reaction OT, 09/14/15, East Lansing 19

20 Horizontal Final Focal plane LISE ++ Analytical solution NIM B70 (1992) 358 OT, 09/14/15, East Lansing 20

21 A=87 Q=17 A=87 Q=18 Experiment 32 S (115 MeV) + 58 Ni : Monte Carlo solution Horizontal projection (this X-inverted plot is used on the next page ) OT, 09/14/15, East Lansing 21

22 A=86 Q=18 A=84 Q=17 A=87 Q=19 A=87 Q=18 A=87 Q=17 Horizontal Final Focal plane LISE ++ Monte Carlo solution NIM B70 (1992) 358 OT, 09/14/15, East Lansing 22

23 Experiment 32 S (115 MeV) + 58 Ni : 87 Mo isotopes transmission 87 Mo FP (tuning for 87 Mo 18+ ) : transmission 14.8 % 87 Mo FP (tuning for 87 Mo 16+ ) : transmission 20.9 % OT, 09/14/15, East Lansing 23

24 Outlook and Acknowledgement Open Questions: 1. Mass & charge dispersion values calculation 2. Using Mass & charge dispersion values for optimization Acknowledgement: to Darek Seweryniak for documents and files providing, to Mauricio Portillo with COSY actions OT, 09/14/15, East Lansing 24