1

Feasibility Study for Stripping Test along L4T Line

(Beam Dynamics)

Veliko Dimov23.04.2013

2

Outline

• Summary of previous meeting (L4-BCC038) about stripping test along L4Z.

• Feasibility study for stripping test along L4T line (beam dynamics).

• Conclusion & suggestions.

3

Injection Scheme L4PSB

4

Option 1 : Installing Only Stripping Foil Unit

• Requires about 20 cm of free space along the beam line

5

Option 1 : Installing Only Stripping Foil Unit

6

• Requires about 1.3m of space along the beam line.

Option 2: Installing Stripping Foil Unit with two Chicane Magnets

Ref: L4-T-EP-0002 rev 1.0

7

Option 2: Installing Stripping Foil Unit with two Chicane Magnets

8

• Bending angle at PSB injection: 66mrad gives around 45 mm offset of the proton beam.

• Beam pipe radius is 50mm.

• Possibility of hitting the beam pipe and missing the dump!!!

Option 2: Installing Stripping Foil Unit with two Chicane Magnets

9

L4T

10

L4T• 10 quadrupole and 3 bending

magnets before the debuncher cavity. D

ebucher

11

Advantage of having the test along the L4T line

• Along the L4T, a movable dump can be aligned according to the proton beam.

Along L4Z

Along L4T

12

Objective of the simulations• H- beam from L4 should fit inside the stripping

foil.• H0 and H- beams after stripping should fit inside

the monitors in front of the internal dump.• Proton beam after stripping must be

transported to dump safely.

13

Beam size along L4T• No loss along the L4T.• Parallel beam on the stripping foil (important for

transporting the beam to the dump after stripping).• Smaller size on horizontal plane (compatible with the foil

& screen sizes).

14

Beam size along L4T• There is no significant growth in

beam size (even in 10m after the foil)Foil

15

Spot size on the foil• The 99 per cent

beam size on the stripping foil is

x=±6mm, y = ±10mm• Because beam size

does not change rapidly, this is also the beam spot size on the H0&H- monitors.

16

Spot size on the foil can be changed

17

Conclusion and suggestions• From beam dynamics point of view, a

measurement bench can be installed at the position of debuncher cavity along the L4T.

• It may be a good idea to install two quadrupole magnets between the test bench and the movable dump. They may be necessary if the beam size is changed on the stripping foil.