Second CLIC Test Facility (CTF-II)

!! Two beam acceleration !!

qtrain 375 nC

qbunch 7.8 nC

30 GHz power out of PETS 1/2 27/22 MW

30 GHz power into CAS 1/221/17 MW

RF pulse length 16 ns

Gradient in CAS 1/2 57/51 MV/m

30 GHz acceleration 30.5 MeV

E m i t t a n c e G r o w t h a n d S h i e l d i n g ( T h e o r y ! )

C o h e r e n c e : c s r > l

S h i e l d i n g : < h c

l a r g e r h o r . b e t a f u n c . - - > l a r g e r e m i t t . g r o w t h

l o n g w a v e l e n g t h s a r e c u t o ff - - > r a d i a t i o n s h i e l d e d

Setup for CSR experiments at CTF-II (emittance growth)

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! R56 > 0 !

-2.00 -1.00 0.00 1.00 2.00

x (mm)

Emittance_X=188.3pi*mm*mrad Beta_X= 0.96m Alpha_X= 0.10

-2.00

-1.00

0.00

1.00

2.00

-3.00 -2.00 -1.00 0.00 1.00 2.00 3.00

y (mm)

Emittance_Y=336.4pi*mm*mrad Beta_Y= 0.76m Alpha_Y=-0.48

-4.00

-2.00

0.00

2.00

4.00

16/11/00 15:12:42

0.00 2.00 4.00 6.00 8.00

-1.00

-0.50

0.00

0.50

1.00

Twiss Parameters of line measem

Dx [m]

Z [m]

0.00 2.00 4.00 6.00 8.00

0.0

5.0

10.0

15.0

20.0

By [m]

Z [m]

0.00 2.00 4.00 6.00 8.00

0.0

5.0

10.0

15.0

20.0

Bx [m]

Z [m]

Emittance vs. Hor. Beta Function

horizontal beta function

vertical beta function

E x p e r i m e n t a l S e t u p a t C T F I I ( S h i e l d i n g )