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L. Keller Apr. 9, 2006. Damage Simulation in MPS Collimators. 3 MPS collimators in this region. end of linac. chicane. energy collimator. wire scanners. MDW. SLAC Damage Test - 1971. Beam scraping the edge of a 30 cm long copper block. 30 cm. 500 kW beam (0.65 MJ in 1.3 sec).

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Presentation Transcript
slide1

L. Keller

Apr. 9, 2006

Damage Simulation in MPS Collimators

3 MPS collimators in this region

end of

linac

chicane

energy

collimator

wire scanners

MDW

slide2

SLAC Damage Test - 1971

Beam scraping the edge of a 30 cm long copper block

30 cm

500 kW

beam (0.65 MJ

in 1.3 sec)

Beam diameter

~ 2000 µ

It took about 1.3 sec to melt thru the 30 cm block, but for this relatively large beam, the front two radiation lengths remain intact.

slide3

Diagnostic Chicane

Use FLUKA to Model an Off-energy Beam Hitting the Sacrificial Energy Collimator

MPS energy collimator

ΔE/E = ±10%

trajectories

MDW

slide4

Beam into Edge of Two Meter Aluminum MPS Collimator

250 GeV beam, 0.16 MJ in 60 µsec

beam axis

Above Al

melting

0.2 cm half-gap

200 bunches

1 from edge,

Ebeam = 250 GeV

X (cm)

Z (cm)

cm

GeV/e-

Al

boiling

Al

melting

FLUKA

slide5

Aluminum MPS Collimator Near Shower Maximum

250 GeV beam, 0.16 MJ in 60 µsec

0.2 cm half-gap

Aluminum

melting

200 bunches

1 from edge,

Ebeam = 250 GeV

beam axis

into page

Y (cm)

X (cm)

FLUKA

GeV/e-

slide6

Beam into Body of Two Meter Aluminum MPS Collimator

250 GeV beam, 0.16 MJ in 60 µsec

beam axis

0.2 cm half-gap

200 bunches

Ebeam = 250 GeV

X (cm)

Z (cm)

cm

GeV/e-

Al

melting

Al

boiling

FLUKA

slide7

Beam into Edge of Two Meter Aluminum MPS Collimator

500 GeV beam, 0.32 MJ in 60 µsec

beam axis

0.2 cm half-gap

200 bunches

1 from edge,

Ebeam = 500 GeV

Above Al

melting

X (cm)

Z (cm)

cm

GeV/e-

Al

boiling

Al

melting

FLUKA

slide8

Beam into Edge of Two Meter Carbon MPS Collimator

250 GeV beam, 0.16 MJ in 60 µsec

beam axis

200 bunches

1 from edge,

Ebeam = 250 GeV

X (cm)

Z (cm)

cm

GeV/e-

FLUKA

C boiling

C melting

mps collimator summary
MPS Collimator Summary:

1. 200 full energy bunches hitting an aluminum block within 2 mm of the edge will eject molten and vaporized aluminum into the gap over a length of ~1 meter.

2. During accelerator tune up, the bunch intensity would need to be reduced by ~2 orders-of-magnitude and the emittance increased to avoid melting. (This is not new information.)

3. To avoid collimator damage, a spoiler/absorber combination would require a ≈0.5 rl consumable spoiler and many tens of meters of drift to the absorber (not simulated yet).

4. If the first part of the 200-bunch train vaporizes aluminum along the beam path, the longitudinal extent of the collimator damage may be considerably greater than one meter (not simulated).

5. A carbon collimator melts and vaporizes in a much smaller volume than in aluminum.