MEA Machine and Experiment Assembly Norbert Meyners MEA

MEA Machine and Experiment Assembly Norbert Meyners, MEA LDC Engineering Design (Status) Introduction General Design Detector opening/End Cap Yoke Split or not Surface Assembly Underground Cavern Size Platform Conclusion 12. July 2007 ILC IRENG 07 WG-A 1

The LDC concept is evolved from the TESLA detector concept. MEA 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Machine and Experiment Assembly Base Picture from “Mechanical Concept of the TESLA Detector” (LC-DET-2001 -045) 2

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Now H. Videau, C. Clerc, M. Anduze, LLR; M. Jore, LAL; K. Sinram, DESY; started to work on the Engineering Model (all part time) Several „small“ changes have happened over the years. Several question came up. Several items are under discussion. (See Videau’s talk: “Toward an LDC engineering model” LDC meeting, Paris May 4; 2007) 3

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A General Design Central Barrel split in three rings for CMS style surface assembly End Cap HCAL made of magnetic iron to serve as field forming nose (to improve the field quality in the central tracker) Shorter Detector High force Q: Fixture? Lumi. CAL enlarged to overlap with the end cap calorimeter Q: Support? Q: Access to Vertex detector? 4

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Assumptions • Surface assembly: in pure CMS style • Main Solenoid discharged during the move: Charge/Discharge Time: ~4 hours (CMS) • Push/Pull Scenario: ~30 days running or maintenance 3 -4 days detector exchange Not only “fast” change over ”Fast“ maintenance too! • Vacuum: Flange and ion pump behind the Lumi. CAL • Lumi. CAL Support With spokes between TPC and ECAL • Central Beam Pipe Support By the reinforced inner tube of the TPC or by the Lumi. CAL support Possible? Stiff structure • Vertex Detector maintenance Once a year 5

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Questions: • • Air Pads or Roller? End Cap Yoke split? • • Support QD 0? Supply QD 0? • • • Vacuum (CMS first yoke discs (600 mm thick) bend 14 mm at full field ( force 7000 t) (Disconnect/Cool down, “Umbilical Cord”, Valve Box, Recooler, Pipe Dimensions …) Anti-DID really needed? Anti-Solenoid really needed? (Conductance, Position of Pump, Small Pump (available? ), …) • Alignment • Magnetic HCAL end cap? • • Support Central Beam Pipe incl. Detectors? Support/Shape Lumi. CAL? Position Beam. CAL? Background Shielding? • • Shape of the TPC … (QD 0, Inner Detectors, …) Really necessary (TPC field quality)? How to fix? (Thickness, Length, Support from QD 0 or Yoke or …? ) 6

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Detector Opening (Beam Position) Splitting the end cap yoke in beam position not necessary with Push/Pull (2 m just sufficient to access the detector; Are there safety rules to be obeyed? ) n n How to support the QD 0? Where to place the recooler? 7

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Detector Opening (End Cap Yoke NOT split) A full end cap yoke disk would be stiffer then two half! Prefered solution! If not split, the End Cap Yoke has to be moved 8 m aside for TPC exchange! Can the QD 0 be disconnected easily? Is this possible with a platform? 8

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Detector Opening/End Cap Yoke split If disconnecting of the QD 0 s is to difficult or time consuming, splitting the end cap yoke could help! Access to Muon System Central Rng Moving the TPC over the QD 0 is at the moment not foreseen (Problem: Lumi. Cal; Support of central beam pipe) 9

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A End Cap Yoke split or not • No final answer now! • The structure of the detector should allow both. To be confirm by the design engineers! (Split yoke end caps may have more engineering difficulties due to the magnetic forces!) • Answer depends mainly on the QD 0 support and supply (Can the supply easily and fast (~1 h) cut or not? ) 10

The supply lines from the valve box to the QD 0 s should go from the bottom (or the top) through the shielding, but not from the side. MEA 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Machine and Experiment Assembly QD 0 Supply, Support, “Umbilical Cord”? Is a continues cryo supply of the cryo box really necessary? 11

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Surface Assembly a la CMS Clear preference! We split the barrel yoke in three rings and do it like CMS. The shaft dimension are at the moment to small! Need 18, 4 m diameter! 12

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Surface Assembly a la GLD It should be possible too!. LDC 1/8 LDC Barrel yoke ~ 440 t; 1/8 LDC End cap yoke ~240 t; GLD 400 t Much cabling work underground What is advantage over the CMS concept? 13

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Underground Cavern Size n n n 25 m floor width are only sufficient, if the walls stay inclined. Length (120 m) is okay. Height (39 m) is large. Beam height (8. 6 m) is just sufficient. Shaft diameter (16 m) is to small for CMS style surface assembly (min. 19. 4 m). 14

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Platform • • Waiting for the talk! No final answer today! Should be possible! Answer depends mainly on the QD 0 support and supply (Can the cryo supply easily and fast (~1 h) cut or not? ) • The concrete platform looks difficult for cable and pipe routing! Preference: Steel Platform • What is the advantage to a system where all support feet would be bolted together (with cones and cups)? 15

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Conclusion • Engineering Design has started • Several open questions (internal, external and mixed) n Lacking information about FD magnets and cryo supply (Dimensions, positions etc. ) • Question about ‘door splitting’ or ‘to use a platform’ are not decide yet. Need further information, discussion and engineering • Where our assumptions right? (Push/Pull duration, …) (I hope I have covered Andrei’s wish list: General design of detector, opening and door splitting and why a particular design approach was chosen) 16

12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A MEA Machine and Experiment Assembly End Thank you for your attention 17

12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A MEA Machine and Experiment Assembly Additional Material 18

MEA (If QD 0 can not be remove) Solution for air pads. Big platform would be possible too! 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Machine and Experiment Assembly Feet 19

MEA (If QD 0 can not be remove) Possible cryo supply routing below the detector 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A Machine and Experiment Assembly Cryo Supply View from below 20

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A TPC Exchange (If QD 0 can not be remove) The central beam pipe could be taken out after the central detector is move by ~1 m. 21

MEA Machine and Experiment Assembly 12. July 2007 Norbert Meyners, MEA ILC IRENG 07 WG-A TPC Exchange (If QD 0 can not be remove) The TPC can be taken after the central detector is move by >2 m. 22