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Comparison of placement classes

This comparison of the PB17 and PB19 placement classes aims to facilitate the decision taking for developing a single, preferred scenario.

The ratings are expressed as follows:

+ : advantageous 0 : neutral - : a disadvantage

Characteristic PB17 Description PB19 Description PB17 Rating PB19 Rating Conclusions
Circumference 96 km 91.3 - 92.1 km
Performance for scientific programme Comparable to the CDR baseline For FCC-ee, a few percent more energy will be required to compensate for the synchrotron radiation losses and for FCC-hh the peak centre-of-mass collision energy will be a bit lower (a few percent) than the baseline. + 0 Both scenarios are adequate to meet the scientific goals. The differences between the two scenarios are marginal. PB17 is slightly better.
Geology No additional risks with respect to the baseline to be expected Higher risk with respect to the baseline, due to placement between two faults in the Vuache region. Impact is not quantifiable today + - tbd
Cost Comparable to the CDR baseline About 5% lower cost due to smaller ring. Potentially more costs due to Vuache fault crossing. 0 + tbd
Experiment site PA placement On CERN Meyrin territory In Prevessin on a field + - Placement of PA on CERN territory is a clear advantage.
Experiment site PG placement In Thorens-Glières. The Thorens location is challenging from integration perspective. farm complex will need to be used. The buildings can be maintained as monuments and could be integrated in the site as visitor space. Outside Villy-Le-Pelloux on a free field, just next to the A410 highway - + PB19 is at a location easier to integrate and easer to access.

-- JohannesGutleber - 2020-12-09

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Topic revision: r1 - 2020-12-09 - JohannesGutleber
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