minutes collaboration meeting 5.Nov.2004, written AF

present: K.McDonald, H.Kirk, J.Lettry, H.Haseroth, T.Otto (partly), A.Fabich

bulletNew beam optics are available resulting in a beam spot of rrms=1.4/1.5 mm. This is a pure simulation solution and does not respect technical possibilities in the tunnel itself, e.g. the last but one quad has been shifted 2 m downstream, where the wall separating TT2 and TT2A is located. A combined study is need. Instead of decreasing the beam spot, one could also envisage a doubling the intensity from 4 to 8 bunches. If we change the layout of the beam line, could nToF run with this as well? this would saave us the time to put averything back in its original place.
bulletThe current interlock situation does not allow an access to TT2A while having beam in the PS. This has severe impact on the running and the removal of the experimental setup. Two solutions are possible:
bulletThe minimum removal can be performed within two working days, where a dedicated PS MD without extraction should be scheduled. This demand has to be placed in the proposal to the research board. This solution does not provide access during the experiment itself.
bulletThe beam line setup has to be changed such, that the radiation level does not exceed 100 mSv/h in TT2A. A study (EDMS 341746, pdf, doc) on radiation level has been done, due to a previous accident in TT2A, where the beam was lost and caused a radiation dos of about 0.5mSv within a single spill, while people where working on the water factory for the nToF target. With an installation of a moveable beam dump upstream of D3 and adding a radiation monitor and the dipole to the interlock chain of the PS, acces could possibly be provided (needs a study).
bulletAn overview the transport times was presented. The solenoid weighs 4.5 tons and clearly exceeds the maximum of the turtle. Ask transport team for solution (AF). Basically the study of actual installation and removal is a task for the EA section. They are experts in this.
bulletJL presented an excel spreadsheet showing the intersection of jet, beam and solenoid with variable jet speed and nozzle position.
bulletThe possibility of using fiber glas (T.Sang) or semiconductor detectors (AF) instead of high-speed camera should be studied in detail.
bulletTiAlV is the preferred material for beam windows. The embrittlement by the mercury splash is to be studied. An additional "thick" plate of stainless steel or equivalent can protect the windows from the mercury splash.
bulletThe space for a control room, power suplly etc should be reserved in the ISR close to the gallery towards TT2A.
bulletH.Kirk expressed, that the procedure to purchase the power supply ALICE/LHCb can be initiated. The following steps should be taken as rapidly as possible:
bulletparallel to the purchase procedure, the definitive specs have to be determined:
bulletcan a single transformer do the job? (action AF): If yes, no transformer will be pruchased; if no, a closer contact with Japan should find a common solution
bulletmodification of DCCT to accomplish for Amax=7200 Amps
bulletmodification to reverse instantaneously the input voltage for faster ramp-down.
bullettwo possibilities for payment
bulletBNL only: in this case, CERN is not involved. A contact to the supplier will be established by CERN
bulletBNL purchases via CERN: get in contact with purchasing office via Carlos (action AF), setup of team-account (action HK), assure BNL to be owner of device
bulletsecond possibility is preferred
bulletA collaboration meeting takes place on Nov16th at Princeton. Topic is the mercury loop and its integration in the solenoid.
bulletWhat is the maximum momentum of the PS and the nToF line?