Summary of 6th WP meeting 02/08/2006
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Wednesday 2 August 2006
West Coast East Coast W.Europe Japan
07.00 10.00 16.00 23.00
Present:
Ties Behnke
Ralf Diener
Madhu Dixit
Ivor Fleck
Keisuke Fujii
Leif Jonsson
Martin Killenberg
Vincent Lepeltier
Takeshi Matsuda
Joachim Mnich
Dan Peterson
Peter Schade
Oliver Schaefer
Ron Settles
Akira Sugiyama
Peter Wienemann
AGENDA
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See the agendafoils
http://www.mppmu.mpg.de/~settles/tpc/lp/wpmtg/wp6thmeeting2august2006.ppt
-1.News
-Formation of the LCTPC/LP Collaboration
-WWS-R&D-panel tracking review at Beijing
-2.WP meeting
-LCTPC/LP goals (Ron)
-LP electronics connectors (Leif)
-LCTPC electronic proposal (Madhu)
-3.Future meetings
-4.AOB
1. News
---------------------------------
1a. Status of the LCTPC/LP collaboration (foils#3-4)
The names for Collaboration-Board (CB) representatives from about 8
out of 35 groups are still missing (the non-checked groups on foil#4).
As soon as these are received, RS will send around the CB list
to everybody, and the next round of discussion on the organization
of the collaboration can start.
1b. WWS-R&D-panel tracking review at Beijing (foil#5).
As announced at the VLSW06, the WWS-R&D Panel is starting regular reviews
of the different R&D projects for the LC detector. Chris Damerell
informed they want to start with tracking (Si and TPC) at the Asian LC
meeting in Beijing (February 2007). Details have not yet been worked out,
but they may want a written report (update of the May-PRC TPC report in
our case), an overview talk at an open session and, perhaps, reports from
each country at a closed session. The organization of our LCTPC
collaboration should be finished by the end of this year, so that
preparing material for the Beijing meeting can more easily be distributed
amongst the TPC groups and be much easier than it was for the PRC. More
info will follow soon when available.
2. WP Meeting
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2a.Purpose of the LP/SP (RS) (foils#6,7)
A first iteration on the LP question was presented by Takeshi at the
meeting two weeks ago (6July2006). At Takeshi?s request, Ron included
possibilities for the small prototypes (SP) in his Vancouver talk (see
http://mppmu.mpg.de/~settles/VancouverTPCtalkJuly2006r.ppt). The idea
(agenda foil#6) could be that there would be two phases for the LP: LP1
where present details developed at the WP meetings over the next few
weeks would be tested, and LP2 around 2009, where a true prototype for
the LCTPC would be buillt/tested. In parallel work can go on using the
SPs to address additional issues which the LP R&D program cannot
get to due to time limitations. A list of possibilites which includes
feedback from Dan is seen on foil#7.
For the LP Dan suggested that we put as many features we know about in LP1
(e.g. a gating grid, C-fiber sandwich structure, etc.). Ron thought it
would be good to implement such aspects as early as possible, but we
have to understand details of how the first-version LP1 sectors will be
built by end 2006. Details which are not yet ripe may be studied using
an SP or later in LP2. Dan thought there may be several intermediate
steps between LP1 and LP2 where such features could be added.
At Vancouver the possibility was discussed of doing multi-track
resolution tests at Fermilab in a 100 GeV hadron beam using the Carlton
SP with micromegas + resistive foil or the MPI SP using triple Gem (a
magnet however was not immeadiately identifiable). Madhu will follow up
these alternatives during the next weeks. Madhu suggested that the SPs may
be too small to really test the jet environment, Ron thought that one
would have to choose the right range of beam energies.
Ties and Joachim reminded that EUDET facility can also be moved to other
beams (e.g. at Cern or Fermilab) if the TPC R&D program requires it.
Other ideas from the collaboration are welcome.
2b.More on the LP electronics (Leif)(foil#8)
Leif?s drawing of the connector for the electronics was discussed.
Dan asked about achievable density of pads, Leif said the connector
on the TPC side can be attached to the pads via flexible cables
and thus adaptable to the chosen pad density. There was a long
discussion about how the drawing was to be understood, which Leif
explained. Leif said he would distribute another drawing which
would make the arrangement clearer.
2c.Proposal for the LCTPC electronics (Madhu)(foil#9)
This was already detailed at the last meeting two weeks ago
(preamp with 25ns T_rise, no shaper, 25MHz digitizer). Leif
replied this is o.k. but that the first LP version using the upgraded
Altro chip won'?t have these specs and aked whether it is necessary
to discuss the next generation electronics already. Ron pointed out that
we have to understand the achievable electronics density for the
LCTPC a.s.a.p. since it affects many aspects of the LCTPC design which is
under continual discussion now. A design study for the next generation
electronics using e.g. 130nm technology can be started now and proceed in
parallel to the LP work, since such design studies require several
iterations and several years of work before they converge.
(Note added by RS: IPN-Orsay colleagues together with RS already did a
design exercise two years ago of assuming a factor 4 improvement
in FEE-board size of the Alice electronics and putting them on the LCTPC
with 2mm x 5mm pads. The exercise failed because of too much material.
What was not yet taken into account then was the need for less cooling
due to power switching; the gain due to power switching is one of
the critical aspects to be understood for the LCTPC electronics.)
(Another note added: Madhu proposed after this phonemeeting
that Carleton/Montreal might be able to build a number of prototype
(using hybrids e.g.) channels with the specs proposed above and mount them
on the LP-- there should be plenty of room--in order to test their
performance. This will be discussed at the next WP phonemeetings in two
weeks.)
2d.LP setup (Madhu). Madhu suggested that the LP gating grid could
be mounted on the fieldcage and thus be usable for different endplates.
In an email which followed this meeting, Akira pointed out that this
would not be possible with the mechanism Dan is planning to use for
mounting the panels in order to minimized the dead space (push the panel
turned sideways through the frame into the drift volume, pull it back
against the frame and bolt it on). This lead to a flurry of emails which
won'?t b summarized here and which agreed with Akira (including Madhu).
4. Future meetings (foil#11)
---------------------------------
-The next phonemeeting will be in two weeks, around August 16.
-Paul/Akira are organizing the 'endcap meeting' in Paris 12-15 September;
preliminary details have been sent; more will follow at the end of the
month. At the end of the Paris meeting there will be a workpackage
phonemeeting where the happenings will be summarized for the WP conveners
and the LCTPC collaboration.
-The annual Eudet meeting will be in Munich 18-20 October.
-The European LC workshop in Valencia 6-10 November.
-The Asan LC workshop in Beijing 4-7 February 2007.
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