Summary of 9th WP meeting 13/09/2006
--------------------------------------------
Wednesday 13 September
West Coast East Coast W.Europe Japan
07.00 10.00 16.00 23.00
Present:
David Attie
Ties Behnke
Paul Colas
Madhu Dixit
Ivor Fleck
Keisuke Fujii
Leif Jonsson
Alexander Kaukher
Martin Killenberg
Hirotoshi Kuroiwa
Vincent Lepeltier
Jean-Pierre Martin
Takeshi Matsuda
Dan Peterson
Peter Schade
Oliver Schaefer
Ron Settles
Akira Sugiyama
Jan Timmermans
AGENDA 13 September 2006
See the agendafoils at
http://www.mppmu.mpg.de/~settles/tpc/lp/wpmtg/wp9thmeeting13sept2006.ppt
1.News
-a.LCTPC/LP Collaboration: formation
-b.WWS-R&D-panel tracking review at Beijing
2.WP meeting
-Status of Paris meeting
3.Future meetings
-Eudetmeeting at MPI 18-20 October
-Valencia European WS 6-10 November
-Beijing Asian WS February 4-7 February
1. News
---------------------------------
1a. Status of the LCTPC/LP collaboration (foils#3-8)
The Collaboration-Board (CB) of group representatives is complete and the
names of both CB and TB are shown on the foils. A proposal by the SP for
the next steps was sent to the CB and TB and the first collaboration
phonemeeting was held on 20.09.2006.
1b. WWS-R&D-panel tracking review at Beijing (foil#9).
Nothing new on this at the moment. Chris wrote that planning still
on-going (it seems that FALC will also be involved).
2. WP Meeting (foil#10)
---------------------------------
This is a short review of Paris meeting. For details see all the talks at
http://www-dapnia.cea.fr/Spp/Meetings/EndPlate
A brief summary was given by each speaker at the phonemeeting. Here are a
few observations of things that not have already been covered at earlier
WP meetings (if the speakers have more, please let me know). Also
included is information by the participants at the phonemeeting.
Summaries of all WP meetings are available at
http://mppmu.mpg.de/~settles/tpc/lp/wpmtg/wpmtg.html
--Ron (Overview)
This was an update of the Vancouver talk, reviewing the performance
issues as drawn up in the LDC and GLD DODs. One new point is that we
should shoot for the best possible momentum resolution because our
competition (SiD) is making a big point that they are better. This
is of course a physics question which must be answered by the detector
studies: what physics do we buy with 1-3x10**-5 tracking resolution?
--Takeshi (PCMAG)
Takeshi reviewed the magnet for the LP@Eudet and followed with a
discussion of the B-field uniformity. Takeshi pointed out that it is not
realistic to think of adding a yoke to PCMAG to improve the uniformity; we
should use another magnet if that is wanted.
--Leif (LP Elelctronics)
Leif showed present ideas for the connectors/channel pitch/pad pitch
based on 1mm x 4mm as discussed in WP meeting #7(16/08/2006). The first
LP version based on the Alice TPC electronics will havea new programmable
preamp together with the Altro chip, and the overall layout is still be
worked on. An interesting development for the future is a Mini-FEC based
on new commercial components: digitizing baseband + digital signal
processing, DSP, advantages: higher density, cheaper price and
reprogrammability are potential improvements over the ASIC technique. The
question of a having a shaping amplifier or not was discussed. The
digital approach was covered by Jean-Pierre in the next talk.
--Jean-Pierre (Digital electronics)
Jean-Pierre went though details of design issues for digiziting
electronics. (A summary won't be attempted here--see the foils for
details.) This approach was proposed by Madu and others in WP meeting
#6(02/08/2006). The advantage of this method is the possibility of
gathering the charge of all to the electrons by adjustments on an
pulse-by-pulse basis.
--Denis Calvet (Electronics for T2K )
Paul reviewed the talk by Denis. The strategy is: re-use ALTRO-based
electronics for detector R&D while designing new read-out electronics.
These are based on a SCA coupled to a FADC connected to the outside world
via optical fiber.
--Ivor (Fieldcage, German-Gem discussion: slides by Ties Behnke)
Ivor (Ties) showed again the fieldcage drawing; see also WP meeting
#8(30/08/2006). The FC length was discussed again (no conclusion yet).
Dan pointed out that the FC rings near the gas-amplification need
clarification. Paul requested that position for a source be included.
The discussion included the question of a laser; it was thought that
integrating a laser would complicate the FC too much for the first LP
version. The question of being able to rotate the FC by 90 degrees for
cosmics was also raised. Ties suggested interchangable panels may be a
solution. Dan thought we might stage the options such as cooling or laser
to a later version of the FC.
The German groups are starting to discuss about their contibution to
the GEM endplate for the LP and are interested in discussions with other
groups.
--Akira (Gem endplate)
Akria discussed that we still have to figure out how we want to
work together and how to decide many things: pad size, sector/panel
geometry, etc. A design of a LP1 should be simple in order to be ready by
end 2007. The Japanese budget foresees a reasonable amount of funds in
2006 so LP1 should converge soon.
--Paul (Micromegas endplate)
Paul reviewed design issues for the LP endplate that he gave at
WP meeting #4(06/07/2006). New points raised here were on the channel
arrangement where he calculates that about 10000 channels will be
needed, and on optimization of the design where weight, radiation
thickness, cooling, stiffness, materials and gas tightness are important
properties.
--Vincent (positive ions)
Vincent didn't have any tranparencies; he went through the arguments
for Gem gating, a dicussion which started in WP meeting #7(16/08/2006) and
is still continuing. Dan informed of a study he will be doing ot the
transmission of positive ions through a 10V Gem voltage.
--David Attie (gas studies)
David has studied a large number of gases studied in recent months at
Saclay. Many properties of gas mixtures have been simulated, and
measurements of gas gain were carried out in a test chamber with
Micromegas amplification. An impressive number of gases including Penning
mixtures were investigated as can be seen on David's tranparencies.
--Jan Timmermans (Si TPC)
Jan gave an overview of the pixel TPC status. Tracks using the
Medipix chip, in Nikhef with Micromegas and in Freiburg with Gem
amplification, were shown along with the explanation by Michael Hauschild
given at Vienna for the difference in results. The development of the
Timepix chip, which is a Midipix design upgraded to give timing
information, was described: prototypes are about ready and test results
expected in a couple of months. Other developments reported were:
Ingrid--integration of a Micromegas mesh on a chip; Twingrid--two-stages
of Micromegas meshes; RELAXD--larger chips. The goal is to have the full
infrastructure for a SiTPC endplate ready by 2009.
3. Future meetings (foil#11)
---------------------------------
-The annual Eudet meeting will be in Munich 18-20 October
http://www.eudet.org/AnnualMeeting2006/AnnualMeeting2006.html
-The European LC workshop in Valencia 6-10 November
http://ific.uv.es/~ilc/ECFA-GDE2006
-The Asan LC workshop in Beijing 4-7 February 2007
http://bilcw07.ihep.ac.cn
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