Impedance of the TOTEM Roman Pots Nicola Minafra, Benoit Salvant, Nicolò Biancacci, …

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Presentation transcript:

Impedance of the TOTEM Roman Pots Nicola Minafra, Benoit Salvant, Nicolò Biancacci, …

The RP system 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 2

The RP system 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 3 Vertical RP Cylindrical RP Horizontal RP Shielded RP 4 X 2 X1 X 2 X

Wakefield simulations using CST 4 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra Real part of the longitudinal impedance for the old horizontal RP at various distances d (mm) from the beam

Wire and probe tests 5 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra Simulations Measurements Cylindrical RPShielded RP TOTEM NOTE: RF Measurements of the New TOTEM Roman Pot Only geometrical contribution!

The RP system D (mm) USED? OLD (PAIR)6.6YES* SHIELDED3.0YES SHIELDED2.1YES OLD (PAIR)6.2YES* OLD (PAIR)6.1GARAGE OLD1.9GARAGE CYLINDRICAL1.9YES OLD1.6GARAGE OLD (PAIR)5.8GARAGE D (mm) USED? OLD (PAIR)6.5YES* SHIELDED3.1YES SHIELDED2.2YES OLD (PAIR)5.9YES* OLD (PAIR)5.8GARAGE OLD2.0GARAGE CYLINDRICAL2.0YES OLD1.7GARAGE OLD (PAIR)5.5GARAGE Beam 1 Beam 2 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 6 * Vertical RP can be extracted in case of problems

The RP system D (mm) USED? OLD (PAIR)5.2GARAGE SHIELDED7.9GARAGE SHIELDED6.5YES OLD (PAIR)6.4YES OLD (PAIR)6.6YES OLD6.1YES CYLINDRICAL6.0GARAGE OLD5.4YES OLD (PAIR)7.4YES D (mm) USED? OLD (PAIR)5.3GARAGE SHIELDED7.8GARAGE SHIELDED6.4YES OLD (PAIR)6.6YES OLD (PAIR)6.8YES OLD6.0YES CYLINDRICAL5.9GARAGE OLD5.3YES OLD (PAIR)7.5YES Beam 1 Beam 2 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 7

23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 8

Low frequency longitudinal impedance 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 9 ℑ[∥]ℑ[∥] Low frequency longitudinal impedance is a conservative estimation of the effective longitudinal impedance Horizontal Old RP 5.4 mm form the beam

Low frequency longitudinal impedance 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 10 Low frequency longitudinal impedance is a conservative estimation of the effective longitudinal impedance Cylindrical RP 1.9 mm form the beam ℑ[∥]ℑ[∥]

D (mm) /03/2015Impedance of the TOTEM RPs - Nicola Minafra 11

D (mm) /03/2015Impedance of the TOTEM RPs - Nicola Minafra 12

D (mm) /03/2015Impedance of the TOTEM RPs - Nicola Minafra 13

D (mm) /03/2015Impedance of the TOTEM RPs - Nicola Minafra 14

Low frequency transverse impedance 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 15 Moving the particle beam, integration path always in the centre Moving the integration path, beam always in the centre

23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 16 D (mm) / / / / / / / / D (mm) / / / / / / / /

D (mm) / / / / / / / / / / / / / / / / /03/2015Impedance of the TOTEM RPs - Nicola Minafra 17

D (mm) / / / / / / / / / / / / / / / / /03/2015Impedance of the TOTEM RPs - Nicola Minafra 18

23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 19 D (mm) / / / / / / / / 67 D (mm) / / / / / / / / 67

23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 20 D (mm) / / / / D (mm) / / / /

21 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra LHC Power Spectrum LHC revolution frequency Number of buckets: 3564 The computation has been done using a flat top Power Spectrum with a bunch spacing of 25 ns. Impedance contribution is only geometrical. Power loss: heating

Old RP horizontal, heating 22 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra

Old RP vertical, heating 23 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra

Shielded RP, heating 24 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra TO BE DONE

Cylindrical RP, heating 25 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra

D (mm) OLD (PAIR) (0.64) < (< 0.1) SHIELDED SHIELDED OLD (PAIR) (0.64) < (< 0.1) OLD (PAIR) < 0.1 OLD400.42< 0.1 CYLINDRI CAL << OLD400.42< 0.1 OLD (PAIR) < 0.1 TOTAL 8.7 (6.9) D (mm) OLD (PAIR) (0.64) < (< 0.1) SHIELDED SHIELDED OLD (PAIR) (0.64) < (< 0.1) OLD (PAIR) < 0.1 OLD400.42< 0.1 CYLINDRI CAL << OLD400.42< 0.1 OLD (PAIR) <0.1 TOTAL 8.7 (6.9) 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 26

D (mm) OLD (PAIR) << 0.1 SHIELDED SHIELDED OLD (PAIR) < 0.1 OLD (PAIR) < 0.1 OLD < CYLINDRI CAL << 0.1 OLD < OLD (PAIR) < 0.1 TOTAL9.4 D (mm) OLD (PAIR) << 0.1 SHIELDED SHIELDED OLD (PAIR) < 0.1 OLD (PAIR) < 0.1 OLD < CYLINDRI CAL << 0.1 OLD < OLD (PAIR) < 0.1 TOTAL9.4 23/03/2015Impedance of the TOTEM RPs - Nicola Minafra 27

Conclusion 8.7 (6.9) 9.4 All RP in GARAGE 4.2 All RP in GARAGE (before LS1) /03/2015Impedance of the TOTEM RPs - Nicola Minafra 28