Minutes of the Geneva AMS group meeting on May 07, 2000
Geneva AMS group meetings
GORE sent last week an offer for the Ribbon-AX cable with all specs we
want. The only point is the spacial qualification. It has been decided to be
done this qualification with the conectors assembled.
As the delivery delay for the conectors is ~8 weeks offers are going to be
demanded. Wrt cable server it has been proposed that the assembly of it
should be a "simplified" version of the flight cable.
For the moment there is no company that can succesfully depose Ni. Still
searching... P. Levtchenko confirms that Gandi will not do the Upilex mass
production. It has been agreed to ask them if they can subcontract the mass
production. On the other hand, the blindage will be done by Gandhi, a nes
design with the holes for alignement (TAS) is in cours.
Probably an italian company can do all Upilex business (litogr., Ni, golding)
M. Pauluzzi is in charge of this.
Report from KSC
Next June there will be the PDR (Preliminary Design Review) meeting. This
document will be prepared by Lockheed-Martin. Tracker representative is
R. Battiston and E. Perrin is the contact person with LM to exchange
Vacuum case of the magnet. Frist prototype is going to be built. It has been
asked enough quantity of holes and fixations. There is the possibility of
using one of the prototypes to construct a "maquette" at CERN (R. Becker in
charge) and perform there some preintegration work. before the final
integration at Zurich.
Cooling: Magnet people want that inner face of vacuum case is at 250K (-25C).
Some modelling shows that tracker influence on the vacuum case is around 15C.
To avoid radiation from tracker to magnet there will be a double shielding
between tracker and the inner face of the vacuum case.
Bart presented the work done for tracker cooling. It seems that tracker is the
only detector that has done a serious work so far. As everybody knows there
are three possibilities:
There is also a redundancy in the cooling system (Independent systems for up
and down) and also two of such systems on each side.
It is needed also to agree on the procedure for the final choice. If
everybody is at Perugia next tracker meeting there will be a 1/2 day
dedicated to this topic.
- MPL, with NH3 or CO2. Drawback: find a pump for three years whitout
- CPL with a heat pipe. A test has been done with a heat pipe with several
heat points. OK.
- CPL with a TPG "band"
Bart has contacted also with a Dutch goverment agency (NRL) that has
experience on cooling system and also are interested.
News from Aachen, probably they cannot take care about vibration test. There
is no problem to perform them either at EPFL or at Munich.
In case of necessity UniGe will provide mechanic support to IDEAS for the
hybrid assembly. As they have the same bonding machine as us UniGe could
built any neccesary tool to them.
Ladder reinforcement. Offer received. It will be comanded soon.
Next week is foreseen a meeting to decide what to do with the glue dispenser
machine.... more news then...
Last week hybrid assembly was discussed with IDEAS. It will be comanded 210
S+K hybrid pairs. In case of necessity it will be comanded 40 more. All this
process will last 6 months, so in this time it can be seen the neccesities to
order these 40 pairs or not. It was agreed to rediscuss the project (time and
cost) after the first batch of assembled hybrids.
IDEAS has proposed an improved design of the ampli on the hybrid. PB and JPR
are studing it.
There is the possibility to do the radiation test for hybrid components here
at Geneva at Hopital Cantonal. First contacts will be done this week.
Gate array for Test System are now at Geneva (Altera EP20K100EQPF240-3). In
next three weeks a board with one of such devices with 50 input pins and 50
output pins will be ready to perform test and validate VHDL code.
This week it will be finished the design of the analog chain on the TDR. A
test board will be constructed to measure consumption and perform test
(probably also for the radiation tests).
Small problems with CSEM: Still no response about the bad/old masks
discovered two weeks ago. Also first batch has arrived to Perugia to be
tested. It has been discovered now that a modification demanded to simplify
some tests is not implemented. This descission was taken by CSEM in december,
and was not communicated to Emmanuelle. There will not be any sensor at
Geneva before the Perugia tests (at least three weeks). This also affects
the schedule with MICRON, because no sensor can be sended to them.
For dummies, First batch received from TRENTO, they are acceptable form the
mechanical point of view. The 2nd and 3rd batches from TRENTO as well as the
batch from CSEM also finished. Next week will be built a mechanical ladder.
Our colleagues from Aachen have reserved a SPS beam to test TRD next 21-26
july. It would be a good idea to used this time to test new VAs and new
silicium production. GA is going to write a proposal for that.
- Geneva AMS group meeting: May. 16 , 2000, 10am, Ecole de Physique
- PRD: June 2000, KSC.
- AMS electronic meeting: Jul 7-10, 2000, Taiwan. GA,ECG.
E. Cortina, May, 07, 2000