1 5 ghz sub harmonic bunchers
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1.5 GHz Sub-Harmonic Bunchers. past – present – perhaps future. L. Timeo on behalf of S. Rey and H. Shaker. Feb 10, 2012. 1. some consideration (1).

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1.5 GHz Sub-Harmonic Bunchers

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1 5 ghz sub harmonic bunchers

1.5 GHz Sub-Harmonic Bunchers

past – present – perhaps future

L. Timeoon behalf of S. Rey and H. Shaker

Feb 10, 2012

1


Some consideration 1

some consideration (1)

  • from “Proceedings of EPAC 2006, Edinburgh, Scotland” - MOPLS101 - (http://accelconf.web.cern.ch/accelconf/e06/PAPERS/MOPLS101.PDF) we know that: “Since the beam loading is different in each of the three SHBs, the structures are individually detuned [5]. The common parameters for the SHBs are listed in Table 1.”

Feb 10, 2012

L. TIMEO

2


Some consideration 2

some consideration (2)

  • from “Proceedings of EPAC 2006, Edinburgh, Scotland” - MOPLS102 - (http://accelconf.web.cern.ch/accelconf/e06/PAPERS/MOPLS102.PDF) we know this is the layout:

Feb 10, 2012

L. TIMEO

3


Some consideration 3

some consideration (3)

  • from [5] “CTF3 Note 071: Parameter list of the CTF3 Linac and the CT line” (http://clic-study.web.cern.ch/CLIC-Study/CTF3/Notes/CTF3_071.pdf) and following the inspection in the tunnel we know that:

    • SHBs are travelling wave cavities (cables are used as loads);

    • PB is a standing wave cavity (fed by wall side);

    • Buncher is a travelling wave structure;

    • ACS03 is a travelling wave structure, as well.

Feb 10, 2012

L. TIMEO

4


Time domain reflectometry

time-domain reflectometry

SHB03

SHB01

Courtesy of S.Rey

Courtesy of S.Rey

SHB02

Courtesy of S.Rey

Feb 10, 2012

L. TIMEO

5


1 5 ghz sub harmonic bunchers

Δ13=7.75MHz

Δ23=1.38MHz

Δ12=6.38MHz

Δ13=-5.25MHz

Δ23=1.38MHz

Δ12=-6.63MHz

Δ13=-1.63MHz

Δ23=0.88MHz

Δ12=-2.50MHz

Feb 10, 2012

L. TIMEO

6


Overview of all s parameters

overview of all S parameters

SHB01

SHB03

From these 3 plots we can conclude the transmission seems to be good enough, but there is a strange behavior in S11 and S22 of SHB02.

SHB02

Feb 10, 2012


Conclusion

conclusion

  • Hamed said that theoretically “the resonant frequencies of SHB1 and SHB2 should be about 10.1 and 3.0 MHz more than SHB3, respectively”, but this does not really correspond to the measurement.

  • we can identify also different behaviors after 1.52GHz, in particular for SHB02 where we can notice some difference especially in its S11, but no final conclusion can be achieved.

  • we shall repeat the measurement once the water station will run again and compare new results with theoretical ones.

Feb 10, 2012

L. TIMEO

8


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