FP 420 Infrastructure in LHC FP 420 meeting
- Slides: 13
FP 420 Infrastructure in LHC FP 420 meeting 8 -Feb-2007 8 February 2007 D. Swoboda FP 420 Infrastructure
Services and Instrumentation § Tunnel Structure Working Group – – Specify requirements for cabling and piping Launch integration study in LHC Schedule pre-installation of services Reserve installation space § Distances detector to near electronics/supplies § possible locations – Underneath nearby machine magnets – Tunnel wall @ § service electronics space reservation § cavities § Undertake radiation calculations for FP 420 sector § Cryostat and detector shielding § Select adequate instrumentation § Radiation issues 8 February 2007 D. Swoboda FP 420 Infrastructure 2
Services space (1) We could drill 'cores' through the concrete lining and into the rock up to a depth of 1 metre. We would then insert a steel pipe and grout it into position. The maximum finished internal diameter is approx. 75 cm. Assuming no services need to be diverted, no water ingress problems, and the core is at around 1 metre above the tunnel floor, an approximate budget cost is : 13, 000 chf per hole = 24 no. * 13 k = 312, 000 chf. 8 February 2007 D. Swoboda FP 420 Infrastructure 3
Services space (2) 8 February 2007 D. Swoboda FP 420 Infrastructure 4
Services space (3) 8 February 2007 D. Swoboda FP 420 Infrastructure 5
Services Space (4) § Available Space – In the region of interest considerable space is already reserved for survey and vacuum instrumentation. – The vacuum installations are mounted in steel frames of 350 mm height. But the total height underneath the magnets is ≥ 400 mm. – The free length available varies but is at least equivalent to 1 VME crate – The closest distance from FP 420 is always less than one magnet length but limited to a couple of crates. § Required Space – A 6 U VME Fantray will have the following outside dimensions: – 482, 6 mm (incl. 19" rack-mounting profile) x 352 mm (8 U) x 553 mm (Wx. Hx. D). – Required at each FP 420 station are 2 VME crates for Si-3 D power supplies. 8 February 2007 D. Swoboda FP 420 Infrastructure 6
FP 420 Services Routing LHCf implementation 8 February 2007 D. Swoboda FP 420 Infrastructure 7
FP 420 BPM requirements Parameter Value Resolution @ central positon ~1 0 μm Precision @ central position ~1 0 μm Acquisition speed 25 Aperture width 8 February 2007 Nom. Beam pipe Unit nsec ø + 2 x (Δx) D. Swoboda FP 420 Infrastructure mm 8
BPM Technologies § Electrostatic pick up (buffer Amp required) § BW: 1 k. Hz – 200 MHz § position resolution: 10 μm § current resolution: 12 m. A § § Button pick up BW: 1 k. Hz – 200 MHz position resolution: 10 μm current resolution: 12 m. A § AM, PM readout electronics, digital readout electronics § BW: 1 k. Hz – 200 MHz § position resolution: 10 μm § current resolution: 10 m. A § BW: 200 MHz, CMRR: ~ 50 d. B @ 100 MHz Courtesy: Marek GASIOR for BDI-PI section 8 February 2007 D. Swoboda FP 420 Infrastructure 9
BPM Technologies Inductive pick up = similar to wall current but with transformers instead of resistors. Strip line pick up Courtesy: Marek GASIOR for BDI-PI section 8 February 2007 D. Swoboda FP 420 Infrastructure 10
Inductive Pick-Up § Four pick-up output signals are processed by an Active Hybrid Circuit ( and signal separation, amplification) § Distribution amplifiers split signals into 3 outputs. One of them is bandlimited ( 20 MHz) for a digitizer input § Digitizers: VME, 8 channel, 12 -bit, 100 MHz (actual clock 98 MHz) § The only timing is the acquisition start § Calibration with current pulses of precise amplitude ( 0. 1 %) § Cal+, Cal-, Cal 0 § BW: 1 k. Hz – 200 MHz, position resolution: 10 m, current resolution: 10 m. A 8 February 2007 D. Swoboda FP 420 Infrastructure 11
Remote positioning control § H/V movement § Cryostat in region of max β § Vertical beam uncertainty ± 2 mm (machine stability limit) § Uncertainty from remnant field, magnet memory (snap back) § Control system architecture & implementation § Interlocks – Risk analysis for beam accident scenarios § Fast movement of closed orbit § Control failure of detector positioning system 8 February 2007 D. Swoboda FP 420 Infrastructure 12
Radiation Environment RADIATION ENVIRONMENT IN THE MAIN RING OF THE LHC Claire A. Fynbo (EST-LEA), G. R. Stevenson (TIS-RP) LHC Project Seminar, 22 -11 -2001 Based on LHC version 6. 1 8 February 2007 D. Swoboda FP 420 Infrastructure 13
