1. 1 PST Heater Panel Design The PST heater panels are internally redundant resistive circuits printed onto a Kapton sheet with an aluminum backing. They have pads for connecting power wires and for connecting the pads to each other to form a Faraday cage. Each pad will have a 10kOhm NTC thermal sensor attached to it. Power wire connection points Connection points for Faraday cage (several)

2. 2 Local Circuit Design The heater panels are paired into circuits of 2 panels each. One power triplet: 2x AWG24 (supply) + 1x AWG22 (grounded return) serves each circuit. One sensing pair: 2x AWG28 serves each panel. Power and sensing wires are soldered to connection points, strain-relieved, then routed toward the slots leading to the cryostat bore. The ground wire on the return power line is daisy-chained from one circuit to the next and connected to ground at the ID endplate. Additionally, one AWG24 wire is added to the wire bundle for grounding. Return, 0 V ground Sensor pair 3 power wires for every 2 panels 2 sensing wires for every panel In, +24 V

3. PST Heater System Layout Forward ABarrelForward C 9 sections 7 sections Top Bottom Sides ● Panels are arranged in rows and sections ● 9+7+9 = 25 rows ● 4 sections (top, 2 sides, bottom) ● Wires routed on tops and bottoms of shells ● Forward wires go out their respective sides ● Barrel wires are split (unevenly) between A and C

4. 4 PST Surface Design The service wires of the heater panels are first grouped together into bundles which are routed toward slots at either end of the barrel. A bundle of power and sensing wires serves a group of 6 or 8 heater panels. A Type BII cable contains 4x AWG22, 8x AWG24 and 16x AWG28 wires. This yields maximum of 4 power triplets and 8 sensing pairs. Bundles serving 8 panels become full cables. Bundles serving 6 panels have unused channels in the cables. Unused wire positions are not filled in the wire bundles. The PST heater system requires 14 cables. 2 13 5 4 6 7 8 9 10 11 1213 14 Wire bundle routing dir’n

5. Forward PST Heater Schematic (A/C Identical) 10 th Row Eliminted (Only 9 Rows Current) Circle signifies area serviced by 1 JST connector (8 pin) 18 Connectors Service 1 Forward Shell

6. Barrel PST Heater Schematic Circle signifies area serviced by 1 JST connector (8 pin) 14 Connectors Service Barrel Shell

7. PST Heater Overall Numbers

8. PST Heater Panel Wiring 1 2 3 6 5 4 7 8 T2T2 T1T1 H1H2 JST Connector Heater Pads ● Two Heater Panels with Common Ground ● One NTC per Panel ● 3 Wires per panel pair ● 1 JST per pair Schematic is not indicative of actual pad locations on heaters

9. 9 PST cables distribution Wire bundles are routed toward the slots at either end of the barrel. These will be ultimately converted to 14 Type BII cables. Barrel SCT EC SCT C Side EC SCT A Side Existing manifold PST Barrel SCT EC SCT C Side EC SCT A Side Cables 1,4 Cables 2,3,5 Cable 10,13 Cable 7 Cable 6 Cables 11,12,14 TOP BOTTOM PST heater Cables Cable 9 Cable 8

10. 10 PST cables distribution and slot assignment Side A Slot B9 Cable [6] Slot B10 Cable [1,4] Slot B27 Cable [3,7] Slot B28 Cable [2,5] Side C Slot B10 Cable [10,13] Slot B9 Cable [8] Slot B28 Cable [11,14] Slot B27 Cable [12,9] 35 mm 4 mm Slot Cross section PST heater Cables CO2 pipes The 14 cables (still wire bundles) are routed through slots toward the cryostat bore. Up to 2 wire bundles are routed through each slot. Along with each wire bundle is an AWG24 ground wire. The CO 2 pipes are accommodated in different slots. Each of the 14 wire bundles is led to a connector at PPB1.

11. 11 PPB1 design Cryostat bore 1 st Alu insulated plate glued to the cryostat 2nd Alu insulated plate glued to the first PST heaters board 1 SCT DST board PST heater board 1 Wires to PST +AWG24 for GND PST heaters board 2 PST heater board 2 Type II cable 4x(AWG22+2AWG20) 4x(2x2AWG28) Each wire bundle is converted to a Type BII cable via its own connector board located at the end of the slot on the cryostat bore. The extra AWG24 ground wire is connected to the single Alu plate on which each board is mounted on. The PST system uses the same board type as the SCT.