LCLS-II High Power RF L1-L3 Spaces Review Andy Haase Feb

Gallery HPRF review SSA and Gallery equipment layout – SSA Details not included as they have been reviewed elsewhere and prototypes are currently being evaluated. – SSA anchor pattern/design previously approved – Have worked closely with others to ensure compatibility with “ancillary” equipment (no offense intended) Waveguide Layout – Routing – Installation plan – Alignment/Precision – Supports – Thermal expansion – Service access and layout review 2

Top Level Layout P2-17 and P6-17 highlighted 3

Gallery Plan Requirements Layout required to accommodate – Clearances for Utilities and other equipment – Water lines – Power and instrumentation cables – LLRF, controls, power supply racks, etc. Installation Service (including R&R as well as required safety clearances) Emergency egress/fire codes – Each penetration unit will include: 4 L-band SSAs 1 LLRF rack 1 other controls rack 1 DC cables rack (~ every other penetration: only one per module) 1 ATCA cables rack (~ every other penetration: only one per module) 1 ATCA cables rack (~ every other penetration: only one per module) Rack heat exchangers Rack heat exchangers 1 shielding cap 4

Gallery Plan Configuration of standard and close spacing – (note variations in standard spacing ~20.5’) 5

Gallery Plan Typical Note space and N-S 6

Gallery Plan Close No access from the north 7

Gallery HPRF Routing Single level waveguide allows flex guide placement and isolator clearance Can accommodate full size radiation shield Service connections (prime power, isolator and SSA rack water) on same side Clearance for use and service Single waveguide flange for SSA R&R Review supporting constraints This configuration requires thermal expansion to be absorbed by the waveguides and “fixed mount compliance” 8

Gallery Routing Tolerances Flexible guide is required to accommodate: – Positional errors/uncertainty between fixed mounting locations – Differential thermal expansion – Geometric errors in the distribution components – Reduction of forces on sensitive elements To determine required guide flexibility various component and installation tolerances were evaluated EIA and Mil standards (RS-261A & MIL-DTL-85) allow considerably more distortion than is typically achieved – Our layout will be based on the typical precision values published by a well known “reputable” vendor. In the gallery, the location of amplifier cabinets is to be established based on the local service shaft or preferably the waveguide end position if pre-installed. – In either case it is expected that the location of the anchors is accurate enough to allow location of the amplifier racks at the nominal lateral position (True position of.5” diameter) – Note that if the cabinets were spaced 1” apart rather than ½” the positional tolerances of the anchor holes could be relaxed Tolerance accumulation has been investigated to verify the routing and support scheme. These approximations are summarized in this review 9

LCLS-II 1.3 GHz SSA Rack Geometry Assures Interchangeability of SSAs from Different Vendors. 10 All vendors required to Comply with: Base anchor bolt pattern Output Waveguide orientation and relationship with anchor bolt pattern, and height from floor. Maximum perimeter specifications. Slots for forklift lifting from either direction Eyebolts on top for lifting with crane. Key points Key points +/-.25 to center 1.25” Dia. anchor holes ½” dia anchors +/-.13” height Note layout spacing is only ½” Note layout spacing is only ½” Anchor location tolerance should not be a factor Anchor location tolerance should not be a factor

Service Shaft Waveguide Four individual waveguide assemblies will be bundled for installation into the service shafts. The individual runs will consist of waveguide fabricated by best available means that might consist of: – Standard box welded and flanged segments – Standard box welded with butt welded lengths – Extruded/drawn tubing The bundle will be supported from the gallery floor After installation the lower/housing ends of the bundle will be released to allow easier lateral adjustment of position The housing ends of the guide will be individually braced laterally but free to expand/contract vertically A Heat loss in the waveguide bundle will be ~300W heat transfer will be via: – Conduction out the ends – Free convection (could be enhanced with a septum) – Radiation and convection to the “earth sink” If additional cooling is required, air can be circulated by a small fan/blower ~30cfm can be delivered to the base of the shaft through a 2” duct. Bulk air temperature rise ~20C at the full 300W Pressure drop below 2.5” of water required It is expected that this fan will not be required 11

Service Shaft - Conduit Conduit is assembled Welded into a bundle – Mounting and lifting hardware is included directly above cg Weight is ~1250 lbs empty All fill is not known at this time but maximum allowed fill results in a total weight of ~2,625 lbs Conduit is installed into service shafts before the waveguide – End protection/bushings/caps are used during installation 12

Conduit Lifting/Support Mounting lifting bracket an integral part of conduit weldment Conduit end protection and thru-hole, bolt on swivel lifting hardware allows for tilt-up lift. Design is ready detailing and specification for procurement 13

Service Shaft Waveguide Long lengths of guide may be assembled from segments of “stock” guide or fabricated to length by other means. Once the entire bundle is assembled (including short horizontal stubs at the top) it will be tested/qualified prior to acceptance. The ends will be capped for transport/installation – The bottom “cap” will also include guides to assist in passing along the previously installed conduit bundle. – It is anticipated that a tag line will be used to help guide the assembly into position The waveguide will again be tested (probably pressure and RF) before accepting the installation. – Subsequent removal and replacement (of the complete bundle) is possible… Weight is ~400Lbs, lift points aligned with cg Additional load from housing distribution is dependent on final support configuration and varies from run to run – Total load will never exceed 1,500 lbs 14

Waveguide Lifting/Support Mounting lifting bracket an integral part of waveguide assembly Waveguide end protection and bolt on swivel lifting hardware allows for tilt-up lift. Note lower/removable brace/guide not shown 15

Installation Clearance (Conduit) Conduit installed first, can be lowered in center then moved to the side for final placement – A guide plate mounting in the housing will push the conduit bundle parallel with the shaft after the waveguide installation is complete. Note: Service shaft is shown at 26” ID to account for the ~1/2” thick step reported to exist just below the gallery floor level 16

Installation Clearance (Waveguide) Once the conduit bundle is in final position (~7.5” off center) – Shaft tilt will result in conduit laying against the side wall when moved into location – The conduit bundle/weldment includes adequate guards/support The Waveguide is lowered into position – shown closer to the conduit – Will be moved toward the penetration wall near final height 17

Support Base Before service shaft component installation begins the gallery will be prepared by installing/anchoring support hardware at required penetrations Image shows support rings and anchor sleeve This sleeve is 40” OD by 27” high and so fits inside the baseline radiation shield (with the upper anchor tabs removed) 18

Installation/Mounting View of conduit and waveguide bundles with lifting hardware w/o mounting base or support sleeve View of conduit and waveguide bundles with base shield rings w/o lifting or mounting hardware – Outer support sleeve is not shown for clarity During installation the conduit and waveguide bundles are “simply” lowered into position. – Mounting hardware is only required for securing in final position. – Lifting rings may be easily removed for use in subsequent installation 19

Installed in Support Sleeve Although mounting hardware appears inaccessible the space is actually quite open 20

Compact Shield Steel and concrete composite shield performs in 40” OD x 46” envelop Cap weighs “only” 3,800 lbs – can be easily removed with standard hand powered equipment With cg just 35” above the floor, can be anchored with only six ½” anchors Efficient use of material and low cost manufacturing makes very cost effective – Net cost below solid concrete baseline 21

Compact Shield Steel and concrete composite shield performs in 40” OD x 46” envelop 22

Housing HPRF Space Additional space below the nominal waveguide is required in certain locations 23

Cryo-Module Connection Forces (moments) on the coupler boxes will be minimized by immediate flex guide attachment The directional coupler LLRF connections may be rotated in away from the walkway to reduce the possibility of damage 24

Horizontal Distribution At the base of every penetration the waveguide will be routed horizontally to the appropriate cryo-module location 25

Housing HPRF Horizontal distribution is unique in every case but can be grouped into just a few configurations Each configuration will be documented Lengths of the “Z” guides will be specified by table based on precise data when available – Can be approximated now 26

Housing Supports Typical Flex and support locations 27

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Housing 30

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