SuperB Gen meeting Oct 5-9, 2009 IR Interface 1 IR Interface Issues M. Sullivan For M. Boscolo, K. Bertsche, E. Paoloni, S. Bettoni, P. Raimondi, et al.

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Presentation transcript:

SuperB Gen meeting Oct 5-9, 2009 IR Interface 1 IR Interface Issues M. Sullivan For M. Boscolo, K. Bertsche, E. Paoloni, S. Bettoni, P. Raimondi, et al. SuperB General Meeting SLAC October 6-9, 2009

SuperB Gen meeting Oct 5-9, 2009 IR Interface 2 A List of Topics at the Interface Physics Beampipe –Inside radius is 10 mm –As thin a Be wall as possible PEP-II beam pipe –Double Be wall 800 um inner and 400 um outer –1.4 mm water channel – water cool from ends? –4 um Au – will need something like this (perhaps thinner) Trapped HOM power – see presentation from this morning Beampipe junction is +/-36 cm from the IP –PEP-II junction was +/-2.4 m from the IP Angle of Acceptance –300 mrad is currently assumed by machine people –Cryostat may end up close to that boundary –Can the SVT data come out on a fiber? Will need quick access to the SVT if we have complicated electronics inside

SuperB Gen meeting Oct 5-9, 2009 IR Interface 3 More Topics Angle of Acceptance (cont.) –Presently assume that any detector hardware inside 300 mrad must be negotiated with machine (and vice versa) This is out to some radius – we should try to see what is an acceptable radius for everyone. –Machine will need some space down near the physics beampipe for a bellows and possibly a flange pair –The SVT will want some space in this area as well –Is there any thought about some sort of low angle detector (veto counter, etc.)? Magnetic Fields –The super-conducting quads will have an external field that might perturb the detector field –The same may be true for the compensating solenoids Kirk will address this in the next presentation –We are looking at race track type of solenoids for QF1 and possibly QD0 if this is a better way to go.

SuperB Gen meeting Oct 5-9, 2009 IR Interface 4 Still More Topics Rapid access to the SVT –Presently working toward a rapid (few days) access to the SVT (and PM) –See the Cryostat design presentation of this morning Cryostat support –If we have W shielding in the form of cylinders on either side we can use these cylinders to help support the cryostats and to enable rapid access by giving us two sturdy supports for a rail type structure –Can we have carbon fiber rods crossing over the top of the SVT like there was for the BaBar SVT? If yes, then this might be a way of securing the two cryostats together. –We have to anchor the cryostats against the large expulsion forces of the detector field Polarization measurements –Just getting started on this issue (see presentation Thurs. morning)

SuperB Gen meeting Oct 5-9, 2009 IR Interface 5 How do we put this together (and take it apart)? This is starting to look like the PEP-II design with large stiff cryostats (permanent magnets for PEP-II) on either side of a small fragile beampipe surrounded by a big fragile SVT If we have to put this together outside of the detector, then how do we get it into the detector? We assume no support tube. Perhaps a removable trough with temporary stiffeners between cryostats? Rolled in on small rollers? How close does the DCH have to be to the SVT?

SuperB Gen meeting Oct 5-9, 2009 IR Interface 6 Latest Cryostat design

SuperB Gen meeting Oct 5-9, 2009 IR Interface 7 Detector doors opened

SuperB Gen meeting Oct 5-9, 2009 IR Interface 8 Outside beam pipes moved

SuperB Gen meeting Oct 5-9, 2009 IR Interface 9 Cryostats slide out of the detector

SuperB Gen meeting Oct 5-9, 2009 IR Interface 10 Summary We need to try to minimize the material for the Be beam pipe We will need to decouple the Be pipe from the cryostats. Bellows on either side. We can not do a magic flange so we have to put everything together outside of the detector. On the bright side this also makes it easier to get fast access to the SVT. This has implications for the space between the SVT and the DCH