Minutes of the SPL steering group (draft )

meeting no. 7

date: 14 March 2008

present: S. Calatroni, E. Ciapala, R. Garoby, F. Gerigk, A. Lombardi, V. Parma, C. Rossi, M. Vretenar, W. Weingarten
excused: R. Losito


1. General news and facts
2. Cryo-modules for different frequencies and at different temperatures (V. Parma)
3. Review of maximum surface fields at JLAB
4. subject3
5. New actions
6. Next meeting

1. General news and facts

  • a half day SPL review meeting will take place on April 30th, Dave McGinnis from FNAL has accepted an invitation to attend. In the morning Dave is asked to give a talk on the status of Project X.
  • the main goal of the review meeting will be the frequency and cryogenic temperature of the SPL.
  • the preliminary schedule for the afternoon meeting is:

Status of analysis of SPL RF frequencies and cooling temperature
Wednesday, 30 April 2008, CERN building 864/1-C02

title subject speaker
Introduction Characteristics of the different SPL implementation stages, design constraints, meeting goals R. Garoby
Potential linac architecture & beam dynamics several (frequency) options for the layout and their impact on beam dynamics F. Gerigk/A. Lombardi
Cryogenics Consequences of tunnel slope, cryo-module design, possibility to reuse ILC/XFEL experience V. Parma
SC cavities performances and overall efficiency as a function of temperature and frequency W. Weingarten + S. Calatroni, F. Gerigk
RF frequency impact on RF hardware E. Ciapala
Discussion, other arguments, criteria, optimisation how far are we from making a choics, which criteria, open questions all
Wrap-up   R. Garoby, F. Gerigk

2. Cryo-modules for different frequencies and at different temperatures (V. Parma)

  • If possible one should avoid the use of superfluid helium (<2.17 K) in order to reduce the complexity, cost, maintenance effort,
  • At 704 MHz it now seems that there is no point going to superfluid helium, at 1408 MHz in pulsed operation it seems necessary but must be studied in depth (tests!) if one really needs to be < 2.17 K.
  • For 704 MHz, 4.5 K the cavities can probably fit into the ILC outer tubes, but it is likely that most of the openings will change position. However, to take into account the slope of the tunnel the interior of the tubes (helium vessels, pumping pipe, shielding) will have to be completely re-designed, so that there will be little benefit from ILC/XFEL work. Probably one can reduce the size of the pumping pipe, but then one has to make sure that the structural stability is still sufficient. Also, there may be a risk of helium dripping down the slope in one direction, while the gas is pumped in the opposite direction.
  • Conclusion: at 704 MHz, 4.5 K it is very unelikely that we can profit from ILC/XFEL work on cryo-modules, at 1408 MHz, 2.1 K a reuse of this design is very likely,

3. Subject two

4. Round table

5. Actions

Assigned to Start date Description State Result
2007-12-07 edit
link to all open actions and closed actions

6. Next meeting

will take place in 2008, to be announced

-- FrankGerigk - 26 Nov 2007

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