From: "Rick Baartman" Subject: Re: UCN meeting prior to ACOT Date: Tue, November 6, 2007 1:47 pm To: "Des Ramsay" Cc: "Ewart Blackmore" ,"Rick Baartman" ,"Shane Koscielniak" ,"Gordon Ball" ,"Jeff Martin" ,"Charles Davis" ,"Shelley Page" ,"Wim van Oers" ,"Lothar Buchmann" ,"Anna Micherdzinska" ,"Akira Konaka" ,baartman@lin12.triumf.ca Trying to make sense of the options, I worked out the following equations. Cost of UCN as a function of siting. BL5A: A "green field" UCN facility that uses the existing cyclotron is to use BL5, a beamline proceeding South along the west wall of the vault, to a new underground area. This would look very much like 2A to ISAC-1 targets. Think of the two targets as providing a way of achieving the minute-scale beam pulsing. One would just use a kicker at the location of the bipolar bender. This is the best and, of course, most expensive solution. I don't know the cost, but it can be estimated easily from our experience of building 2A and the ISAC-1 targets. BL5B: This is the option listed as BL5 in jmartin-meeting-10-17-7.pdf. It option would save about 40m of beamline and the construction of a new underground area, but would use up most of the proton hall space. It would still need its own dump. Cost: BL5B = BL5A - 40m_beamline - Underground_area. BL4A: UCN in the proton hall in the old TISOL area. At 100uA, this would use up a lot of the proton area, but not quite as much as BL5B because using Jeff's fast-sharing scheme, it could use the ISAC3 beam dump. It would also use the same BL front end as ISAC3. This includes the extraction equipment, combination magnet, first few optics. Cost: BL4A = BL5A - 40m_beamline - BL_frontend - Underground_area - Beam_dump = BL5B - BL_frontend - Beam_Dump. BL4N: This would require the new underground area for the UCN. Cost: BL4N = BL5A - 40m_beamline - BL_frontend - Beam_dump = BL4A + Underground_area. -- rick baartman TRIUMF 4004 Wesbrook Mall Vancouver, BC V6T2A3