Minutes of RD42 meeting at CERN October 4, 1995. ------------------------------------------------ Transparencies from the formal presentations are being copied and will be sent to each collaborator early next week. The presentations followed roughly the agenda that was circulated before the meeting: New Studies - CERN (d,iV) Meier Strasbourg (Magnetic Fields) Husson Heidelberg (protons and alphas) Baumann U.S. (Cleaning) Kagan Status of Renewal Trischuk Status of Norton Growths + future directions Kagan Status of deBeer's Growths + future directions Trischuk Diamond Orders in 1996 (a first look) Trischuk Testbeam Results - July 95 Schnetzer Sept. 95 (magnetic field) Dulinski Oct. 95 Zoeller Walsh Irradiations - Pions 1995 Hrubec Neutrons Dulinski 1994 Pion irradiation paper Kagan RD42 Business - New collaborators Talks/Papers and contributions to meetings Several points were discussed in more detail. The most important of these concerned the status of outstanding diamond orders. We now have orders for four 10cm diameter wafers outstanding with Norton (Two from Europe and two from the US). Norton has recently upgraded their growth reactor in an effort to make the growth process more robust. They have done a series of chemistry runs (wafers only a few hundred microns thick) which convince them that they should be able to produce full thickness (700-800 mirons) as-grown wafers with collection distances of up to 125 microns (RD42 would then thin these (removing poor substrate side material) and irradiate them which should allow us to reach the 200 micron collection distance milestone we have been set). Norton still expects to fill several of the outstanding orders before the end of the year. DeBeers have almost filled our order for 10 1x1cm^2 pieces in 1995. The last four samples are expected by the middle of November. We have begun to explore ways to continue collaborating with them in 1996. They will provide us a quote for 40 cm^2 of material (including some samples as large as 2x5 cm^2 on which to make slightly bigger trackers) before our next collaboration meeting. The request for renewal has been considered and approved by the LHC Detector Review Board (LDRB). Their recommendation was favourably received by the LHC experiments Committee (LHCC) but final approval was delayed pending clarification of our (RD42's) intentions to study diamond pixel devices. A one page addendum is being prepared (a draft was circulated at the group meeting. The most up to date version can be found on VXCERN: DISK$WH:[DIAMOND.RENEWAL]LDRB_2.PS) outlining our plans in this direction for the coming year. The outcome will probably be an additional milestone urging us to study the charge collection properties of "pixel-like" devices, however it seems clear that the LHCC is aware that it will be impossible to make a fully working pixel detector (with bump-bonded readout electronics) in the next 12 months. At the meeting there were several requests for new/additional devices to be made available. Neutron irradiations are continuing at ISIS however all but one of the samples currently being tested suffer from the cleaning problems described at the meeting by H. Kagan. The final ISIS run (until next summer?) is scheduled to start on November 6. One additional sample (properly cleaned) is available for this run, but 4 others were requested. It was suggested that one good way to test the charge collection simulations in diamond was to prepare trackers with readout strips on the growth side. Until now all strips have been on the substrate (smooth) side, however on recent tracker had a very rough substrate side and strips still look quite good. Finally there was some discussion of new collaborators. CERN has been approached by members of the University of Florence (and INFN-Florence). A student (who has been growing CVD samples) will come to CERN to work in the characterisation lab for a week or two later this fall as a first step towards possible further collaboration. The University of Iowa has approached our American collaborators. They would like to use a diamond layer as a multiplicity detector in the upcoming FNAL fixed-target run. Steve Schnetzer was charged with pursuing further negotiations with them with the goal that they would soon become a "full" member of the RD42 collaboration. The Vienna group offered to host the next group meeting. It is expected that this will be held in late January (dates to be confirmed in the next couple of weeks). It was also suggested that we investigate holding intermediate meetings via teleconference. CERN has the hardware to make this possible and several of the North American groups are in the process of acquiring it. It was agreed that we try this facility as soon as possible for a smaller meeting (eg. preparation for a beamtest or of irradiation samples) to see how it goes. We could then plan larger group meetings in the future. William