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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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wire scanners

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  1. 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

  2. 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.

  3. Diagnostic Chicane Use FLUKA to Model an Off-energy Beam Hitting the Sacrificial Energy Collimator MPS energy collimator ΔE/E = ±10% trajectories MDW

  4. 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

  5. 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-

  6. 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

  7. 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

  8. 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

  9. 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.

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