high resolution mass separator for the desir facility at spiral2
DESCRIPTION
Teresa Kurtukian-Nieto CEN Bordeaux-Gradignan XVIth "Colloque GANIL" Giens, September 8 th 2009. High resolution mass separator for the DESIR facility at SPIRAL2. HRS: initial conception Design goals Ion optical calculations Prototypes: HRS C135 HRS Alpha Asymmetric - PowerPoint PPT PresentationTRANSCRIPT
Teresa Kurtukian-NietoCEN Bordeaux-Gradignan
XVIth "Colloque GANIL"Giens, September 8th 2009
High resolution mass separator for the DESIR facility at SPIRAL2
Teresa Kurtukian Nieto September 8th 2009 2Colloque GANIL, Giens
HRS: initial conception
Design goals
Ion optical calculations
Prototypes:
HRS C135 HRS Alpha Asymmetric HRS Alpha Symmetric
Outlook
Outline
Teresa Kurtukian Nieto September 8th 2009 3Colloque GANIL, Giens
HRS: initial conception
High resolution separator with enough mass resolution to allow
isobaric separation.
Resolution ~ 20000
mm
DESIR
Teresa Kurtukian Nieto September 8th 2009 4Colloque GANIL, Giens
Design goals
The design of the HRS should fulfils the following requirements :
High transmission (ideally 100%) and high resolution in order to provide mono isotopic beams of exotic nuclei.
Compact configuration, to be able to fit in the SPIRAL2 production building.
Should be robust in order to tolerate errors in alignment and component manufacturing.
Reduced costs, concerning both installation and operation.
Teresa Kurtukian Nieto September 8th 2009 5Colloque GANIL, Giens
Design goals
Resolving power: Ideal case:
is the total amount of aberrations00 002x 2x x
mR=dm(x | δ) DR= =(x | x) M
002x(x | δ)R=(x | x)+ Δ
In order to get a high resolving power, a large value of (x|δ) and a small value of (x|x) and Δ are desirables.
Teresa Kurtukian Nieto September 8th 2009 6Colloque GANIL, Giens
Ion optical calculations
Ion-optical code COSY INFINITY
Beam emmitance:
The SPIRAL2 high intensity radio frequency cooler SHIRAC will be coupled with the high resolution separator HRS.
Its purpose is to cool the radioactive beams to an emittance below 3π.mm.mrad.
With cooled beams the HRS should reach its design performance in mass resolution (~20000).
F. Duval talk
Teresa Kurtukian Nieto September 8th 2009 7Colloque GANIL, Giens
Monte Carlo Simulation: mass distributions
Input beam:
50000 particles with mass deviations -1/20000, 0,
+1/20000 .
Final phase spaces calculated to 5th order
Teresa Kurtukian Nieto September 8th 2009 8Colloque GANIL, Giens
Prototypes
HRS C135 HRS Alpha
Teresa Kurtukian Nieto September 8th 2009 9Colloque GANIL, Giens
HRS C135
Transfer matrix (x, ) (a, ) (y, ) (b, )
x -1.004793 -4.517902 0.000000 0.000000a -0.210E-2 -1.004670 0.000000 0.000000y 0.000000 0.000000 0.9991091 -0.459E-1b 0.000000 0.000000 -0.3695E-1 0.991949δm -26.50605 -59.73332 0.000000 0.000000
+1/20000-1/20000
(x|δ) = -26.5 cm/%
Mirror symmetric
point-to-point both x and y
Q
M
S
S
Q
Object plane
image plane
Teresa Kurtukian Nieto September 8th 2009 10Colloque GANIL, Giens
COSY INFINITY X and Y motion
Dm = = 26.5 cm/%R ~ 26500
( | )x
Teresa Kurtukian Nieto September 8th 2009 11Colloque GANIL, Giens
HRS Alpha Asymmetric
Transfer matrix : (x, ) (a, ) (y, ) (b,
)x 0.4794806 4.745134 0.0000000.000000a -0.7961E-2 2.006843 0.0000000.000000y 0.000000 0.000000 1.4702323.969397b 0.000000 0.000000 -0.966E-10.4193341δm 10.14652 -0.224E-04 0.0000000.000000
(x|δ) = 10 cm/%
asymmetric for M plane
(x|x) ~ 0.5
symmetric for mid-plane
point-to-point both x and y
Teresa Kurtukian Nieto September 8th 2009 12Colloque GANIL, Giens
COSY INFINITY X and Y motion
Dm = ~ 10 cm/%R ~ 20000
( | )x
Teresa Kurtukian Nieto September 8th 2009 13Colloque GANIL, Giens
HRS Alpha Symmetric
δm = = 26.5 cm/%M = -1.0
( | )x Transfer matrix
(x, ) (a, ) (y, ) (b, ) x -1.004793 -4.517902 0.0000000.000000a -0.210E-2 -1.004670 0.0000000.000000y 0.000000 0.000000 0.9991091 -0.459E-1b 0.000000 0.000000 -0.3695E-1 0.991949δm -26.50605 -59.73332 0.000000
0.000000
Same as HRSC135
Compensation doublet
Doubly symmetric: cancel high order aberrations
Teresa Kurtukian Nieto September 8th 2009 14Colloque GANIL, Giens
Outlook:
TRANSPORT, GALOP
ZGOUBI
D. Toprek
GICOSY:
Teresa Kurtukian Nieto September 8th 2009 15Colloque GANIL, Giens
Outlook: Fringe field effectsMatrix with Fringe Field (FF) effects taken into
account:
(x, ) (a, ) (y, ) (b, )x -1.004793 -4.517902 0.0000000.000000a -0.210E-2 -1.004670 0.0000000.000000y 0.000000 0.000000 0.999109 -0.459E-1 b 0.000000 0.000000 -0.370E-1 0.991949 δm -26.50604 -59.73332 0.0000000.000000
Matrix FF off:
x -3.126042 -9.264154 0.000000 0.000000a -0.946891 -3.126042 0.000000 0.000000y 0.000000 0.000000 0.6700217 -11.66724b 0.000000 0.000000 0.4723E-1 0.670021δm -26.93832 -60.48427 0.000000 0.000000
COSY Infinity:
Simulations of field maps with other codes, such as TOSCA, in order to carefully evaluate the fringe field effects and later perform a more realistic study of possible misalignment effects on the resolution.
Teresa Kurtukian Nieto September 8th 2009 16Colloque GANIL, Giens
HRS working group
CENBG: B. Blank, T. Kurtukian-Nieto, L. Serani
GANIL: F. Varenne
CSNSM Orsay: D. Lunney
Institute of Nuclear Science Vinca, Belgrade : D. Toprek
Teresa Kurtukian Nieto September 8th 2009 17Colloque GANIL, Giens
Backup slides
Teresa Kurtukian Nieto September 8th 2009 18Colloque GANIL, Giens
Misalignment effects on mass resolution
Phase spaces calculated to 5th order
50000 particles with mass deviations -1/20000, 0, +1/20000 .
A shift in the multipole of 0.2 mm in the x-direction induces a deformation in the x-a phase space which is responsible for the blur in the final mass separation. In this example m/m is reduced to ~11000