1 RF Workshop 16 th & 17 th April 2012 Design Layout Alan Grant, STFC.

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Presentation transcript:

1 RF Workshop 16 th & 17 th April 2012 Design Layout Alan Grant, STFC

Overview Review Panel Recommendations Coax Distribution Coax Installation Coax supports Magnetic Field – 4616 pre amp Next Steps Summary 2

Recommendation from Review Panel RF Distribution Coax high power line stretchers not warranted. Relocate Hybrid splitters from behind shield wall. Provides more space for access to amplifiers. Reduces the length and volume of 4” coax. Were possible reduce number of coaxial joints. Mechanical Installation & Maintenance Try and install all under floor coax distribution at stage V. Design improved mounting mechanism to minimise protrusions. Improve lateral movement capability for any miss-alignment of coax distribution during installation. 3

Initial RF Layout – view from cooling channel side 4

NEW RF Layout – view from cooling channel side 5 line stretchers removed. no 4 inch coax over wall. hybrid splitters moved - more accessible manually adjustable phase shifters to take up errors in coax length easier to assemble – introduced flexible coax.

Initial RF Layout – view behind shield wall 6

NEW RF Layout – view behind shield wall 7 hybrid splitters moved – space freed up behind wall. no coax distribution going under the wall. Previously 8 off 4 inch under wall. 6 off 6 inch coax over the top of wall. Previously 8 off 4 inch over wall. Coax length matching now takes place other side of wall – space less of a constraint. improved access for installing amplifiers.

NEW RF Layout – view behind shield wall 8

Initial 4” Coax Distribution 9 Phase shifters to each cavity coupler Coax length matching behind shield wall above amplifiers

NEW 4” Coax Distribution 10 Flexible coax in each line – assemble & alignment easier Manually adjustable phase shifters to take up errors in coax length Total travel 60mm Next steps:- Match the coax lengths. Position coax supports. Coax under floor split for easier access and installation

Coax Sections – Installation/Removal Concerns 11 ~55mm required to clear mating flangeFlexible coax system in each line. Have adjustment in clamp system. Phase shifters to be installed last in assembly sequence

Coax Supports 12 Rotation Vertical Longitudinal Horizontal CLAMP TEE SLOT RAILS

Pre Amp Tube Position Behind Shield Wall Pre amp tube below level of shield wall ~ 0.16m and spaced ~ 0.53m back. Initial magnet field analysis predict approx 8-10 gauss. Wall Tube 4616 Pre Amp

Next Steps - What Phase Angle Do We Design For? 14

Summary Addressed all of the issues raised by the review panel. Changed the design as per their recommendations. There are no clashes with the steel work on both the cooling channel false floor and the parked position false floor – lighting trunking clash on South mezzanine floor which is being resolved. Some concrete on south side needs to be removed. Installation made simpler with introduction of flexible coax and relocation of hybrid splitters. No clash issues with moving AFC’s to parked position on false floor. Magnetic field calcs indicate no issues for 4616 pre amp. Fire officer has been consulted and agreed that what is proposed causes no access problems or issues. 15