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2/4/2004 TT2A target test: GENERAL & PHYSICS present: S.Gilardoni, H.Kirk, H.Haseroth, J.Lettry, A.Fabich contact urgently L.Leistam for commissioning schedule of ALICE, F.Szoncso for alternative power supplies (action AF) Q: How long is the delay for ordering and delivery of a purchased power supply type ALICE/LHCb? 10 months selon C.Martins Possibly we need to move the power supply ALICE twice or three times. Only a single movement is indicated in slide 3. Q: How long does it take, until the kicker of PS can be launched again? Milliseconds? If it is possible, what do we gain? manpower at CERN for physics 2 man*years, project management 1 man*year Q: HK should provide a table of investment manpower/money provided by/in the US? What is already financed and not? J.Engelen has been informed on the activities towards a target test in TT2A (in the context of Neutrino matters). Using the power supply type ALICE/LHCb would make it possible to ramp faster and reduce heating in the solenoid. shielding/dump useful downstream of TT2A target test to protect other beam elements and nToF target. Dump is for sure possible in dedicated mode. define disposal of mercury loop: vessel, pipes, etc. JL did not see list of manpower needed for removal of experiment. Do we need a dedicated mercury lab outside of TT2A? Can we transform part of TT2A into a mercury lab, which would at the same time solve the problem of ventilation? Estimate Feasibility + costs + manpower needed? nToF beam would most probable scrape the jet chamber/mirrors! What is the beam envelope in TT2A at nToF running? Does this imply the dedicated mode for TT2A target test? It should also be noted that it was agreed that the minimal disruption to the nTOF program would have us setup, take beam the 1st 2 weeks of the PS program, and then dismantle our setup so that no beam obstructions are possible in the beam line toward the nTOF target. This has important implications concerning the need to be concerned about the nTOF Pb target, and the beam disruptions due to our windows. What is the activation of the solenoid during TT2A target tests (action HK)? Can we handle optics locally or do we need remote control? The optics can be designed such, that pictures are made of the jet in two or three different places (half mirrors inside and one observation just outside of the bore): Also attached is a schematic optics path diagram (eps-format) which summarizes our discussion concerning the need for optical diagnostics at more than one position along the solenoid axis. This scenario calls for one 2/3R-1/3T mirror and one 1/2R-1/2T mirror. It includes one input optical path from a laser and has three exit optical paths to 3 separate cameras. pulse list: running in (5 pulses), vary B-field (0,5,10,15 T) at max.
intensity (4 pulses, repeat three times), vary intensity at 0 and 15 Tesla (2x4
pulses, repeat twice), pump probe at 0 and 15 Tesla (2x5 pulses, repeat twice),
vary beam position (5 pulses) HK presents the following list:
HK: At any rate I get a total of 38 shots which when coupled with start up problems and mishaps looks to me like we are looking at a ~60 shot program. At 8 shots per day, we should be able to do this within a 2 week time frame. Time schedule:
Who is designing/building/testing the mercury loop? In the solenoid at MIT? With final optics? Is this all done only at CERN? Testing the setup without beam should as well take place in TT2A? see also
above mercury lab in TT2A. Or can we perform test at the present location of
ALICE power supply? Needs LN2 etc. as well? TT2A Option 1 or 2 or 3: O3 is very far downstream, extends optics system and lines for power and LN2. At the same time, nToF target is not really a dump. O1 and O2 are similar, where I have the impression, that O2 provides more space. Option 2 was favored because it: provides more space, is more removed from possible camera locations, electronics, etc. an is more removed from the upstream tangle of equipment. INTC meets end of May and again in September. A man*year in the work shop accounts about 80 KChF, a fellow about 160 KChF and staff more than this ;-) |
