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Some MKI observationsduring fill 1794 -1859

MD 25ns Wk43V. Baglin (1/11/11)

CERN TE-VSC, Geneva

1. 2.

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MKI LSS2

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MKI LSS8

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Fill 1794• Fill 1794 : 50ns_1308b_108bpi_13inj_scrub

• At 450 GeV

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Fill 1794 – MKI LSS2 • Fill 1794 : 50ns_1308b_108bpi_13inj_scrub• 450 GeV• Solenoids ON

• MKI : 3 -> 5 10-10 mbar

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Fill 1794 – MKI LSS2 - intermodule • Fill 1794 : 50ns_1308b_108bpi_13inj_scrub• 450 GeV• Solenoids ON

• Pressure blue beam larger than red beam• Pressure increases from Q5L2 to Q4L2• Blue : 4 -> 6 10-9 mbar• Red : 4 -> 11 10-10 mbar

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Fill 1794 – MKI LSS8 • Fill 1794 : 50ns_1308b_108bpi_13inj_scrub• 450 GeV• Solenoids ON

• MKI : 5 10-10 mbar

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Fill 1794 – MKI LSS8 - intermodule • Fill 1794 : 50ns_1308b_108bpi_13inj_scrub• 450 GeV• Solenoids ON

• No strong difference between two beams• • Blue : 6 -> 24 10-10 mbar• Red : 1 -> 2 10-9 mbar

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Fill 1859• Fill 1859 : 50ns_1092b+1small_1042_35_1008_108bpi

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MKI2 - Tank• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2 and B1+B2, highest pressure in tank MKI close to Q5L2• Pressure is lower than for MKI8 case

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MKI2 – intermodules line B1• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2, almost no pressure increase, whereas it increase with B1+B2•

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MKI2 – intermodules line B2• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2, almost no pressure increase, whereas it increase with B1+B2

• The copper chamber does not produce significant pressure increase due to electron cloud

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MKI8 - Tank• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2 and B1+B2, high pressure in tank MKI

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MKI8 – intermodules line B2• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2, high pressure in inter-module at extremity of tank with highest pressure• The highest pressure in on the right of the tank• Pressure ratio at extremities between 2 to 5

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MKI8 – intermodules line B1• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2, high pressure in inter-module at extremity of tank with highest pressure• The highest pressure in on the right of the tank• The pressure is lower than inter-module B2• Pressure ratio at extremities equal 7

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MKI8 – intermodules right of tank 2• 50ns_1092b+1small_1042_35_1008_108bpi• • With B2, high pressure in inter-module at right extremity of tank with highest pressure• The highest pressure in on the right of the tank• The pressure ratio is 2 to 3•

• The ceramic chamber seems to have the highest pressure increase

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Fill 2251• MD25 ns, wk 43• Fill 2251 : 2100/1020 b spaced by 25 ns and 925 ns, 72bpi

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MKI2 - Tank•

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MKI2 – Tank with intermodules•

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MKI8 - Tank•

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MKI8 – Tank with intermodules•