Overview of HINS Operations and Radiation Shielding Considerations in the Meson Detector Building Bob Webber August 16, 2006

Layout with One SSR-2 Cryomodule

Review of Work on this Topic Webber – Proposed Beam Ops Document, July 2005 and revisions (now Beams Doc. #2394) –Describes operating parameters at different energies and different stages of installation Vaziri – Preliminary shielding/dose estimates, February 2005 –Assumed beam energies up to E Hz for 1.35E18 pph –Finds 14.7 R/hr on top of 3’ concrete cave roof for full beam loss –Determines single pulse accident not an issue with 3’ concrete Lauten – Preliminary shielding/dose estimates, August 2005 –Assumed E18 pph (Webber Stage 4c parameters) –Finds 185 R/hr on top of 3’ concrete cave roof for full beam loss (factor of ~ 2.7 larger than normalized Vaziri number for slightly different conditions) Vaziri – Provided 2.5 MeV beam stop calculations April/May 2006 Rakhno – August 2006 note comparing conditions to MuCool 2003 dump design –110 MeV, 1.7E14 ppp, 2.0E18 pphr and 4E21 ppyr vs. 400MeV, 1.6E13 ppp, 3.5E17 pphr and 10E21 ppyr –Concludes that Meson layout reserves sufficient volume for absorber and there are no groundwater problems

Review of Proposed Operating Conditions Machine design has changed –Energy at exit of first four cryomodules is now: SSR 1 cryomodule 1 : MeV SSR 1 cryomodule 2 : MeV SSR 2 cryomodule 1 : MeV SSR 2 cryomodule 2 : MeV NOT 110 MeV! –Need space at end of machine for beam diagnostics Anticipated funding has changed –Second SSR 2 cryomodule may be dropped Revise proposed maximum conditions –95 MeV, 1.75E14 ppp, 4.5E17/hr (95/110)^6 = shielding scaling w/energy 2/10Hz (1 hr average) = 1.26E17/6.3E18 = 0.2 max hourly rate –Lauten’s 185 R/hr → 15.3 R/hr for full beam loss –If drop to 65 Mev get another (65/95)^6 = 0.10

3’ Concrete Shielding - Scaling with Energy

Scaling of Shielding with Energy and Thickness

Target Occupancy Conditions and Proposed Solution MDB is now posted as Controlled area –Consistent with normal operation at <5mr/hr and minimal occupancy –Consistent with operation at <5mr accidents Area of concern is localized to near high energy end of machine Propose to meet these conditions with: –Shielding as presently laid out with further consideration of entrance labyrinths –Interlocked chipmunks on top of 3’ concrete cave roof at high energy end

Meson Floor Plan

Tasks at Hand Finalize specification of beam operating conditions (Webber/Apollinari) Propose absorber design (Webber/Reilly et al.) Model and verify absorber design (Rakhno) Design labyrinths (may need one on west side!) (Gerardi/Lauten) Understand low energy end requirements (???) “Design” chipmunk layout (???) Write up formal shielding assessment (Webber, Steimel et al.)

Meson Schedule 2006 rev. 4/20/ MHz klystron delivery –March 2006 Modulator completion –April 2006 – June MHz RF power system commissioning –May 2006 – June MHz component testing in RF test area –June 2006 – July MHz cavity power testing in cavity test cave –August 2006 RFQ (now in procurement) delivery and power testing –October 2006 – December MeV beam tests –November 2006 – January 2007