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

QQ

Q

QQ

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