Dumps at different energies
LHC commissioning status meeting
F. Burkart
on behalf of BTP section
Motivation
• Check the dump position on the TDE with the BTVDD screen.
• Check the stability of the dump position as a function of energy.
• Beam dumps with 2 – 4 nom. bunches performed at 450 GeV, 1 TeV, 2
TeV, 3.5 TeV, 5 TeV and 6.5 TeV.
LHC commissioning status meeting - 09/06/2015
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First tests - 450 GeV Beam 2
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Stability of dump position
• Dump position stable for
B1/B2 and b1/b2.
• Max. variation: 10 mm.
Different filling pattern
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After image flip – Beam dump @ 450 GeV, B1
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After image flip – Beam dump @ 450 GeV, B2
Off-set in B2 of up to 35 mm (hor.) and 20 mm (ver.) found.
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Beam dump @ 6500 GeV, B2
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Off-set measurements
Adjusted the image by
• -20mm (hor), +17mm (ver) (B2)
• -1.4mm (hor), -12mm (ver) (B1)
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Re-check the image centres
B1
B2
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First dump after first stable beams – B1
10 mm
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First dump after first stable beams – B2
30 mm
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Beam dump after de-bunched beam – 450
GeV – B1
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Beam dump after de-bunched beam – 450
GeV – B2
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Conclusions and further work
• Image has the right directions.
• Positions stable within 10 mm.
• Images adjusted – off-set corrected.
• -20mm (hor), +17mm (ver) (B2)
• -1.4mm (hor), -12mm (ver) (B1).
• Bunches still displaced (max 30 mm) .
 might come from camera angle.
• Bunches a bit outside of reference line, MKB delay w.r.t. MKD?
 investigations done by Matthew.
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Thank you for your attention!
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Beam dump @ 6500 GeV, B1
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How it is now – dump during ramp to first
stable beams, 4127 GeV - B1:
10 mm
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How it is now – dump during ramp to first
stable beams, 4127 GeV - B2:
15 mm
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