Collider Ring and IR – Optics Design for MEIC

MEIC Meeting, Alex Bogacz September 25, 2009 1

Collider Ring and IR – Optics Design for MEIC

Alex Bogacz

Figure-8 Collider Ring (electrons)

Compact Arc with Low Emittance Dispersion〈 H〉

Dispersive straight

Asymmetric IR with conical FF quad (first)

Pair of IRs with dispersion waves

Chromaticity compensation

Natural Chromaticity Compensation Arc and dispersive

straight

‘Compensation Block’ next to IR


Compact Figure-8 Collider Ring - layout

2

3 3150

180

C L

L

C

-5000

-3000

-1000

1000

3000

5000

-15000 -10000 -5000 0 5000 10000 15000x [cm]

z [cm]

Figure-8 Collider Ring - Footprint

60 deg

total ring circumference: 660 m


36 FODO cells, total arc length: 180 m

empty cells empty cells

Electron Ring Compact 2400 Arc

Arc dipoles

$Lb=150 cm

$B=12.3 kG

$ang=3.53 deg.

Arc quadrupoles

$Lb=50 cm

$G= ±4.5 kG/cm

10060

Thu Sep 24 15:36:57 2009 OptiM - MAIN: - N:\bogacz\ELIC\MEIC\Optics\compact lattices\electrons\Arc_R_mis.opt

15

0

0.4

-0.4

BE

TA_

X&

Y[m

]

DIS

P_

X&

Y[m

]

BETA_X BETA_Y DISP_X DISP_Y390

Thu Sep 24 15:41:52 2009 OptiM - MAIN: - N:\bogacz\ELIC\MEIC\Optics\compact lattices\electrons\Arc_L_mis.opt

15

0

0.4

-0.4

BE

TA_

X&

Y[m

]

DIS

P_

X&

Y[m

]

BETA_X BETA_Y DISP_X DISP_Y

phase adv./cell (x= 1200, y=1200)

B/3 2B/3

B/32B/3

9 GeV

dispersion suppressed with ‘missing dipoles’

50

Thu Aug 06 23:12:15 2009 OptiM - MAIN: - C:\Working\ELIC\MEIC\Optics\compact lattices\electrons\5m_120_cell.opt

150

0.5

0

BETA

_X&Y

[m]

DISP

_X&Y

[m]


32 FODO cells, B

5 meter FODO cell


36 FODO cells, B, total arc length: 180 m

empty cells empty cells

10060

Thu Sep 24 14:58:18 2009 OptiM - MAIN: - N:\bogacz\ELIC\MEIC\Optics\compact lattices\electrons\Arc_L_disp.opt

15

0

0.4

-0.4

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]



Electron Ring Compact 2400 Arc

Arc dipoles

$Lb=150 cm

$B=11.6 kG

$ang=3.33 deg.

Arc quadrupoles

$Lb=50 cm

$G= ±4.5 kG/cm

390

Thu Sep 24 16:00:10 2009 OptiM - MAIN: - N:\bogacz\ELIC\MEIC\Optics\compact lattices\electrons\Arc_L_disp.opt

15

0

0.4

-0.4

BE

TA_

X&

Y[m

]

DIS

P_

X&

Y[m

]


9 GeV

No dispersion suppression


30 FODO cells, total length of the straight : 150 m

Arc

Electron Ring Dispersive Straight

quadrupoles

$Lb=50 cm

$G= ±4.5 kG/cm

9 GeV

No dispersion suppression from the Arcs end

850

Thu Sep 24 17:15:51 2009 OptiM - MAIN: - N:\bogacz\ELIC\MEIC\Optics\compact lattices\electrons\Straight_disp.op

15

0

0.4

-0.4

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]



0 1sext

sextsext

g


IR Optics (6m + 6m ‘magnet free’ region)

340

Thu Sep 24 21:42:25 2009 OptiM - MAIN: - C:\Working\ELIC\MEIC\Optics\IR\ele\e_6m_IR_2.opt

15

00

00

50

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]


*

*

25

5

x

y

mm

mm

l * = 6m

IP

Q1 G[kG/cm] = 3.4Q2 G[kG/cm] = -4.3 Q3 G[kG/cm] = 5.5

FF triplet : Q1 Q2 Q3

6

6

85 10

17 10

xN

yN

m

m


340


0.5

0

0.5

0

Siz

e_

X[c

m]

Siz

e_

Y[c

m]

Ax_bet Ay_bet Ax_disp Ay_disp

IR Optics – Beam Envelopes

*

*

25

5

x

y

mm

mm

l * = 6m

IP

FF triplet

6

6

85 10

17 10

xN

yN

m

m

,* *

, *,

2x ytrip

x yx y

l

Asymmetric focusing (*) for flat beams desirable, x/y ~ 5

Initial focusing of larger emittance plane results in minimized beam sizes in both planes

Manageable beam sizes on FF quads, RMS ~ 3mm


IR Optics – Natural Chromaticity

340


15

00

00

50

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]


*

*

25

5

x

y

mm

mm

IP

Q1 G[kG/cm] = 3.4Q2 G[kG/cm] = -4.3 Q3 G[kG/cm] = 5.5

1 1, , 0 , 14 4IR i i i ix y x y x y

i i

g ds k 2

1

1[ ]y yB Be

k dl dl mB x pc x

FF triplet : Q1 Q2 Q3

Natural Chromaticity: x=-139.1 y =-842.6


FF triplets

A pair of IRs Anti-symmetric Dispersion Wave

700

Thu Sep 24 18:12:01 2009 OptiM - MAIN: - N:\bogacz\ELIC\MEIC\Optics\IR\ele\e_6m_IR_IR_2.opt

15

00

00

3-3

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]


IP IP

FF triplets dispersion matching


700

Thu Sep 24 23:27:26 2009 OptiM - MAIN: - C:\Working\ELIC\MEIC\Optics\IR\ele\e_6m_IR_IR_2.opt

15

00

00

3-3

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]


FF triplets

A pair of IRs Symmetric Dispersion Wave

IP IP

FF triplets dispersion matching


symmetric dispersion wave

Compensation Blocks

4426


50

00

0

3-3

BE

TA_

X&

Y[m

]

DIS

P_

X&

Y[m

]

BETA_X BETA_Y DISP_X DISP_Y 4426


50

00

0

3-3

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]


anti-symmetric dispersion wave


Flexible Momentum Compaction Bend

triplet Q3 Q4 Q5

singlet Q2

triplet Q5 Q4 Q3

4 × 450 rectangular bends

4.084070

Tue Sep 15 12:43:06 2009 OptiM - MAIN: - N:\bogacz\Gamma project\Arc_FMC_1.opt

80

0.5

-0.5

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]



Same Bend Compensation Block

Inward bends inward bends

4.30

Fri Sep 25 00:17:16 2009 OptiM - MAIN: - C:\Documents and Settings\bogacz\Desktop\Gamma project\Arc_FMC_imagi.o

10

.01

0

0.5

-0.5

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]

BETA_X BETA_Y DISP_X DISP_Y 4.084070


10

.01

0

0.5

-0.5

BE

TA_

X&

Y[m

]

DIS

P_

X&

Y[m

]



Opposing Bend Compensation Block

Inward bends outward bends

4.30


10

.01

0

0.5

-0.5

BE

TA

_X

&Y

[m]

DIS

P_

X&

Y[m

]

BETA_X BETA_Y DISP_X DISP_Y 4.084070


10

.01

0

0.5

-0.5

BE

TA_

X&

Y[m

]

DIS

P_

X&

Y[m

]



Conical First FF Quad IR?

Pawel Nadel-Turonski

Collider Ring and IR – Optics Design for MEIC

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Transcript of Collider Ring and IR – Optics Design for MEIC