To: lctpc@desy.de
Subject:Summary WP phonemeeting #54 Wednesday 09.April.2008
Dear lctpc colleagues,
Below is a summary of last Wednesday's phonemeeting. Let me know
if you have something to add/change...
I would like to thank Ron for replacing me chairing this phonemeeting and
writing this summary.
Greetings,
Jan
-----------------------------------------------------------
WP#54 09/04/2008
---------------------
Wednesday 9 April 2008
West Coast East Coast W.Europe Japan
07.00 10.00 16.00 23.00
Agenda
-----------------------
1. News
2. LP cosmic trigger
3. LP fieldcage, endcap/panels, laser etc
- Dan's URL:
http://www.lepp.cornell.edu/~dpp/linear_collider/LargePrototype.html
4. Electronics
5. AOB
Present:
--Paul Colas
--Ralf Diener
--Klaus Dehmelt
--Lea Hallermann
--Jochen Kaminski
--Martin Killenberg
--Alexei Lebedev
--Dan Peterson
--Peter Schade
--Ron Settles
--Akira Sugiyama
--Jan Timmermans
Excused:
--Dean Karlen
--Takeshi Matsuda
--Anybody forgotten?
Summary
-----------------------
0. Slides are at the agenda site:
http://ilcagenda.linearcollider.org/conferenceDisplay.py?confId=2660
1. News.
-Ron chaired this meeting since Jan just had dental work today
which compromised his discussing/talking ability.
-The Desy PRC documents are on the meeting website: a)our written
report was submitted before the PRC meeting on 1.4.2008 and b) Takeshi's
presentation at the open session. Some highlights are given below.
At the closed session, our LCTPC MOA Addendum was reviewed and Uli Koetz
gave his referee's report. We do not yet have the final PRC
recommendations for the LCTPC work.
-Highlights of the open session:
a)Our written report consisted mainly of an i)introduction saying why an
LCTPC is needed, a ii)review of progress since the last PRC (May 2006)
and iii) the LCTPC MOA showing how the Collaboration is being formed.
Since i) and iii) should be familar to everybody, only ii) will be
mentioned in these minutes.
Under ii), The executive summary of recent progress was given and the
detail report followed. The executive summary which included most of the
points in the detailed report was:
=> Americas.
..Carleton and collaborators have measured very good point-resolution
values using Micromegas plus resistive-anode technique.
..Victoria made such measurements using GEM plus normal anode in the
past and is now actively pursing correction techniques for E- and B-field
distortions for the large prototype (LP) being built for the Eudet
facility at Desy.
..Cornell is a key player in designing and fabricating the endplate
components for the LP; Cornell and collaborators are also measuring
point resolution using their small prototype with GEM and Micromegas
endplates.
..BNL has joined the LP effort and is providing a system of laser
mirrors for it.
=> Asia.
..The Asian groups and other collaborators led by the KEK and Saga CDC
groups are
(1) measuring point-resolution for different gas-amplification
technologies and testing gas mixtures using the MP-TPC and Tsinghua TPC
prototypes,
(2) simulating and testing of GEM gating and
(3) preparing GEM detector modules for the TPC at the LP at the
DESY test beam.
..KEK provided the magnet for the Eudet facility at Desy.
..The Minadano group has been active in analyzing the test-beam data
taken with the MP-TPC.
=> Europe.
..All European groups have been, in addition to other work below,
actively involved in getting the hardware built and software written for
the LP work which is to start this year at the Desy test beam:
..Bonn/Freiburg -- GEM pixel module and software,
..Desy and other German groups -- fieldcage, infrastructure and
coordination,
..MPI-Munich -- LCTPC coordination and the MP-TPC prototype with
different endplate technologies,
..Saclay/Orsay -- Micromegas pixel and resistive-anode modules and
the LP trigger,
..Lund/Brussels/CERN -- LP and LCTPC electronics, and
..Nikhef -- CMOS pixel TPC and Timepix development, to be tested
in the LP.
b) Takeshi's presentation at the open session contained in addition
more information on the following highlights:
..The theoretical understanding of the TPC resolution developed at Kek.
..The Bonn contribution to the software development.
..The LP trigger work at Saclay.
..The Cern/Desy work on the PCMAG fieldmap by Cern/Desy.
2. LP cosmic trigger.
-Paul reported that the trigger preparations at Saclay are essentially
finished except for the ironing-out of some details, and it could be taken
to Desy essentially any time as soon as it is needed there (probably
May).
3. LP laser, endcap and fieldcage.
Laser:
-----
-Alexei put his latest ideas on the agenda site (see point 0. above).
Endcap:
-------
-Dan reported that the following orders have been placed and that delivery
can be expected in ca. 6 weeks:
2008-04-09 What was ordered?
Endplates .................. (2)
Mounting Brackets ... (16), enough for both endplates, plus spares.
Field Cage Termination assemblies: (2)
BackFrames
"3GEMG" ................(20), 6 for active modules, 14 dummies to be
constructed at Bonn
.........................................plus, there were 2 delivered to
Saga 2008-02-28
"Micromegas" ........... (6), all for active modules
.........................................plus, there were 2 delivered to
Saclay 2008-02-28
"3GEM No Gate" ..... (1)
"Pixel GEM" ............. (0)
.........................................there were 2 delivered to Bonn
2008-02-28
Fieldcage:
----------
-Peter reported that mandrel is finished and the fabrication of the FC
can start at the company Heindl. Delivery time expected: 2-4 weeks.
TPC sensitive volume:
-----------------
-There was a discussion about the materials that can be put into
the TPC sensitive volume. It was concluded that G10 (PR4) is acceptable,
but anything unknown should be tested first.
Gem Panels:
-----------
Akira reported that the Japanese Gem panels are delayed by about 4 weeks.
Micromegas panels:
------------------
Paul reported that a panel with Micromegas+pilars+resistiveanode has been
successfully produced. First tests have started and look promising.
Schedule:
--------
Klaus Dehmelt has posted the latest update to the LP schedule on
the meeting site (see point 0. above). Everyone is requestded
to study it and give feedback in case he/she knows of changes.
4. LP1 electronics.
-Leif reported the status to Klaus Dehmelt who put the information in
his latest schedule (just mentioned). See Items#63-73.
5. AOB.
-Next meeting:
WP55 phonemeeting 23 April 2008.