Reverse technique for A1900

Transcription

1 Reverse technique for A1900 v from 02/03/16 1. LISE-type reverse file creation 2. Optics (1 1) 3. Optics (2 1) 4. Detector resolution for optics (1 1) 5. Contribution of straggling in wedge 6. Some remarks: charge states 7. Summary Direct file: Reverse file: 1

2 Preparation of direct file : double focus & achromatism initial final 2

3 LISE-type reverse file creation beam direct reverse beam 3

4 First order matrix elements: R/R, R/A, R/D 4

5 First order matrix elements: A/R, A/A, A/D 5

6 Initial emittance to generate an array of rays to benchmark 6

7 LISE-type reverse file creation With reverse configurations it is possible to use experimental rays from the final point LSE ++ rays generated for current reverse mode (LISE or COSY) zoom Four ray arrays have been generated at the final plane using LISE ++ reverse mode: Using 1 st order optics Using 2 nd order optics Using 1 st order optics and thin I2 Using 1 st order optics and thick I2 7

8 target target Benchmarking process of the reverse technique final final beam direct 1 2a 1 2a 3 reverse 2b beam 3 2b 8

9 1 st order optics Direct and Reverse envelopes direct X Y reverse 9

10 X vs X reverse results direct 1 st order 2 nd order reverse 2 nd order LISE technique woks in the case of A1900! 10

11 Y vs Y direct and reverse 1 st order optics plots 1 Y vs Y 1 st order Cut by apertures (angular acceptance) 2a 3 11

12 Y vs Y direct and reverse 2 nd order optics plots 1 Y vs Y 2 nd order Cut by apertures (angular acceptance) 2a 3 12

13 Y vs Y reverse different optics order plots 2 nd order LISE technique woks not so bad in the case of A1900! 13

14 Reverse (Final Target) : X vs. dp/p

15 X (horizontal) direct & reverse envelopes for 1 st & 2 nd order optics direct 1 st order 2 nd order reverse 15

16 Y (vertical) reverse envelopes for different order optics 16

17 size ±50 mrad Band 5 mrad Using detector resolution (x,y) with 1 st order optics : X vs X d(x), d(y) = 1 mm, d(x ), d(y ) = 2 mrad, d(e) = 0 % manually been entered in the ray file X vs X 1 st order size ±3 mm Band 0.3 mm Ideal resolution case 17

18 size ±40 mrad Band 5 mrad Using detector resolution (x,y) with 1 st order optics : Y vs Y d(x), d(y) = 1 mm, d(x ), d(y ) = 2 mrad, d(e) = 0 % manually been entered in the ray file Y vs Y 1 st order size ±3 mm Band 0.3 mm Ideal resolution case 18

19 Using detector resolution (x,y) with 1 st order optics : Y vs Y d(x), d(y) = 0 mm, d(x ), d(y ) = 0 mrad, d(e) = 2 % manually been entered in the ray file 1 st order Expected answer due to the achromatic mode 19

20 Contribution of straggling in wedge : Y vs Y Y vs Y 1 st order Thin wedge: 10% of range Thick wedge: 40% of range 20

21 size ±50 mrad Band 5 mrad Contribution of straggling in wedge : X vs X X vs X 1 st order Thin wedge: 10% of range size ±3 mm Band 0.3 mm Ideal resolution case, no wedge 21

22 size ±50 mrad Band 5 mrad Contribution of straggling in wedge : X vs X X vs X 1 st order Thick wedge: 40% of range size ±3 mm Band 0.3 mm Ideal resolution case 22

23 Charge states in reverse technique Negative thickness wedge Focal plane : X vs q Negative thickness material do not change charge state distributions!!! 23

24 Summary 1. The A1900 LISE-type reverse configuration has been created, its benchmarks have been done 2. High order optics is important in the reverse A1900 case. COSY-type reverse configuration should be tested. 3. Second order LISE-type optics operates well in the reverse A1900 case 4. Energy resolution at the final focal plane detectors is not a key factor in the reverse A1900 case comparing to the S800 case 5. Use of thick wedge destroys reverse resolution quality in the horizontal spatial plane 24