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SPS wire scanner prototype

SPS wire scanner prototype. Benoit Salvant and Carlo Zannini for the impedance team With the help of Elena Chapochnikova, Jose Ferreira Somoza, Jose Varela and BI colleagues SPSU meeting - 27/02/2013. Question.

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SPS wire scanner prototype

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  1. SPS wire scanner prototype Benoit Salvant and Carlo Zannini for the impedance team With the help of Elena Chapochnikova, Jose Ferreira Somoza, Jose Varela and BI colleagues SPSU meeting - 27/02/2013

  2. Question • Bernd informed us that the wire scanner tank is likely to be installed without the wire scanner. • Is that acceptable from longitudinal point of view?

  3. Eigenmode simulation results Above TE11 cutoff of attached pipe (~1.09 GHz ) Is this acceptable from longitudinal point of view? Q should be lower in real life ECR coming. We will anyway request bench measurements (probes in particular to assess the Q)

  4. “Ugly” devices in the SPS? (from impedance point of view)

  5. One example: near QF 41801 CDD database ~2007 From SPS OP site December 2013 Some drawings missing and some not up to date

  6. Impedance of “bare” bellow transition Shunt impedance in Ohm Frequency Qs are of the order of 4000 to 8000

  7. Impedance of transition with bellows Shunt impedance in Ohm Frequency Qs are of the order of 500 to 3500 Shunt impedance could reach of the order of 100 kOhm (depends on actual length).

  8. How to proceed? • The safest is to survey the machine in the tunnel half cell by half cell (drawings are not up to date…). Can probably be done in two days. • Survey points: • Potential issues for impedance • Where are the shielding of pumping ports missing (needs VAC colleagues as not obvious from outside) • Where are damping resistors installed? • Other ideas? • When? • Now is good as a lot of time and no radiation • But some parts of the machine are still not reinstalled • Who? • Carlo, Jose, Fritz, Benoit ? needs

  9. QF32210 Shunt impedance in Ohm 100 kOhm Frequency (GHz)  Also of the order of 100 kOhm (if Q is correct)

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