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Information about Hamburgpipe

Published on January 14, 2008

Author: Reginaldo


Hamburg pipe project – status and plans:  Hamburg pipe project – status and plans Benoit Florins, Krzysztof Piotrzkowski, Guido Ryckewaert Université Catholique de Louvain Introduction: Reminder what the HH pipe is First technical meeting - CERN, Nov 9 List of open questions and tests Next steps Slide2:  Small project: moving pipe was to minimize distance to e-beam during ep collisions – detector readily accessible, in normal atmosphere Hamburg pipe:  Hamburg pipe  Routinely used at HERA at high L, since 1995 … : Technical coordinator: Uwe Schneekloth (DESY) bellows shielding moving pipe Slide6:  The “Hamburg pipe” was originally proposed for the PETRA wiggler beam line, and is still in use today. A similar solution, suggested by U. Schneekloth (DESY) in 1994, was used for tagging photoproduction at HERA by detection of very forward electrons. Basically, a section of beam pipe is oversize and is displaced sideways with the detectors attached, but separated from the vacuum by an “envelope”. The pipe, some 43 m from the interaction point, was routinely displaced after HERA was in collision mode, such that the (calorimetric) detectors were in the working position up to about 20 mm from the beam. The step motors and control electronics were the same as for the HERA electron collimators. The detector could be easily maintained and was successfully and routinely operated for 6 years providing data for several publications. PETRA wiggler pipe – original inspiration, still in use… Slide7:  Parking position RF screen? For an FP420 application some modifications might be necessary, with an RF shield (through which the detectors approach the beam via narrow slots), to minimise any impedance change on the beam. The design of RF screen and contact of the HERA chamber were very simple and cheap. Some copper braid was used. Before the chamber was built, the design had been tested by moving prototype many (several thousand) times. Aims of the meeting of 9 November for FP420.:  Aims of the meeting of 9 November for FP420. Identify the relevant open issues requiring R&D, studies and tests, and start to define the set of the 'global' parameters for the design. Exchange all possible technical info on the materials, parameters, specifications and requirements in each particular domain. Establish personal contacts and future exchanges, plan next steps and work. See: Draft Agenda of Informal Discussions:  Draft Agenda of Informal Discussions 09.30 Introduction, K.Piotrzkowski & K.Potter Detector layout ~10.00 A second generation cryostat (Sebastien Marque) Integration into the LHC - Help from TS/LEA. (Emmanuel Tsesmelis, Daniela Macina) ~10.30 The 'Hamburg Beampipe' concept, Krzysztof Piotrzkowski Mechanical issues (Tadeusz Kurtyka) ~11.00 Vacuum Issues (Christian Rathjen) Lunch break 14.00 RF Issues (Elias Metral) Alignment - not to be forgotten (Helene Mainaud) ~15.00 Suitable High precision BPM's (Rhodri Jones) Who does what next? - General discussion Connection Cryostat “COLD MASS”:  Connection Cryostat “COLD MASS” T (vacuum pipes) < 3.3 K to allow sufficient H2 cryopumping => vacuum pipes immersed in a bath of superfluid He Minimal distance between bus-bars and beam pipes to avoid B magnetic field on the beam 124.5 mm LHC Integration issues:  LHC Integration issues Continuity cryostat (S. Marque) Assure the continuity of all LHC arc services Volume left for detectors Mechanical issues (Tadeusz Kurtyka, TS/MME) Bellows Thin windows Movement Alignment (Helene Mainaud, TS/SU) Moveable detectors (~20 mm with respect to beam (BPM’s) 5 micron precision on the detector to beam distance ( ≥ 3 mm) Precision BPM’s (Rhodri Jones, AB/BDI) Assymetry ~ 20 mm movement (linearity) Long term stability and calibration Wakefields and RF issues (Francesco Ruggiero, Elias Metral, AB/ABP) Beam impedance RF screens Sliding fingers Vacuum issues (Ray Veness, Christian Rathjen, AT/VAC) Isolation valves NEG pumps Bakeout Ion pumps LHC/Experiment interface and general coordination (Emmanuel Tsesmelis, Daniela Macina, TS/LEA) A detector alignment test bench? A horizontally displaceable beam-pipe at the LHC ?:  A horizontally displaceable beam-pipe at the LHC ? A basic schematic Slide13:  FP420 Detector layout ~8 m 20 mm movement Double set of bellows Double set of bellows ~ 85 mm diameter Beampipe ? 44 mm diameter non-concentric beampipe 20 mm movement Beam two K. Potter slide A horizontally displaceable beam-pipe at the LHC:  A horizontally displaceable beam-pipe at the LHC Plan view 44 mm diameter round pipe thick copper ? Enlarged pipe ~85 mm diam. Detectors Thin window Off-momentum proton Alignment RF screen, 15° D ± 5 μm K. Potter slide FP420 ISSUES: Louvain perpective:  FP420 ISSUES: Louvain perpective DETECTOR   Layout and dimensions of the detectors Vacuum window size and thickness How are detectors fixed to support structure   INTEGRATION INTO LHC   Clearance available vertically and longitudinally in modified cryostat Define overall space available for the device outside the cryostat in the tunnel Longitudinal location of detectors (w.r.t. each other, to ends of movable tube, to BPM's) Height of beam line to ground   PUMPS – VACUUM   Isolation valves Required vacuum Pumping system: what types of pumps? Bakeout temperature – tube elongation   ALIGNMENT   General philosophy: - either: the detectors always move to identical positions and beam is moved to canonical position using BPM's - or: beam position is measured and detectors are moved to canonical distance from actual beam axis   How will the moving beam pipe device be aligned in the tunnel at installation? What needs to be provided on the support structure? TESTS   What type of testing is foreseen during prototyping? Is it useful to test not a full-scale prototype? Use mock-ups? Do we plan specific (integration/alignment) tests at CERN? At test beams?     MISCELLANEOUS   Any cooling required? What are the radiation levels in this area? MECHANICAL   Recommendations / specifications for materials to be used for different purposes Precision and tolerances on: - beam tube positions (height, laterally – x,y) - detector positions Intermediate beam pipe supports required? End flange design/layout of LHC beam pipe to connect moving pipe Isolation from vibrations required? (Marble table?) Required dimensions/shapes for the different elements: beam pipe, transitions, RF screens, sliding tables – for example, what is the allowed length of the wall at 3 mm from the beam axis from the RF point of view? Use positioning (driving motors, control system, …) and position measurement devices same as elsewhere in LHC? Electric end-switches required? Mechanical stops provided. What interface with LHC control system? What if moving pipe system "crashes" – gets stuck? Emergency exit/withdrawal system ?   Slide16:  detector moving tube motor BEAM BEAM marble table INTRODUCTION axis moving tube beam marble table RF screen G. Ryckewaert slide Slide17:  Detector position (precision-tolerance)? Mechanical Specifications for materials Required dimensions? Electric end switches? Interface with LHC control system? intermediate support? end flange? use positioning? emergency exit system? G. Ryckewaert slide Slide18:  layout detector? Vacuum and detectors detector fixing? isolation valves? pumping system + required vacuum? bakeout T° - tube elongation? G. Ryckewaert slide Slide19:  INTEGRATION INTO LHC location of detector? height of beam? clearance available in modified cryostat? define overall space? how aligne moving beam pipe? any cooling required? radiation levels? G. Ryckewaert slide Slide20:  G. Ryckewaert slide Slide21:  D. Dattola / S. Marque FP420 - 09/11/2005 Slide22:  D. Dattola / S. Marque FP420 - 09/11/2005 Slide23:  HeII Beam pipes Heat exchanger BusBars Support posts (T) Support post (Tamb) Thermal insulation on cold mass structure Usable Volume (Tamb) Vacuum Vessel Cold to warm transition warm to cold transition Radiation Shielding (beam-gas + proton losses) Bottom tray thermalisation Magnetic shielding (busbars on beam pipes ?) S. Marque / D. Dattola FP420 - 09/11/2005 Slide24:  1.9K MLI (2x10layers) – 4K/6mm Vacuum >= 2mm Thermal shield (actively cooled 80K) – 1mm MLI (2x15layers) – 80K/12mm Vacuum >= 4mm 300K FROM 1.9K to 300K: AT LEAST 25mm S. Marque / D. Dattola FP420 - 09/11/2005 Slide25:  One possible solution: Wire Positionning System… Resolution: 0.1 mm Range: 10 mm along two axes Repeatability: 1 mm Bandwidth: 0-100 Hz WPS sensors use a capacitive measurement technique along 2 perpendicular axes. They measure the distance between its mechanical axis and a stretched wire which is the reference. On each measurement axis, the wire sits between 2 electrodes WPS does not include any electronic components The wire is made of carbon fibers and its geometry is maintained by a sheath of woven PEEK filaments. H. Mainaud slide Slide26:  One exemple: the energy spectrometer Energy spectrometer installed in the LEP in 1999 to determine the beam energy with a relative accuracy of 10-4. Which requires an accuracy of 1 mm on the beam position 12 WPS were installed to determine the relative mounting stability of each BPM, in order to avoid unnoticed movements. H. Mainaud slide Slide27:  One basic test to check the behavior of the sensors: to change the set point of the water temperature regulation system for the BPM. Other tests demonstrate a WPS resolution of less than 0.3 mm. The expansion of the BPM determined from the WPS signals can be compared with the expansion coefficient of aluminium from which BPM are made. Performance of the WPS (example of the energy spectrometer) H. Mainaud slide Slide28:  Alignment system and accuracy To determine the position accuracy, we need to answer all the following questions… Slide29:  Some first answers… Integration of the alignment system and its constraints as soon as possible Influence of all these constraints on the chosen alignment system will have to be tested. Next steps:  Next steps Study further two scenarios of the cryostat modification – with detectors in the air, or in the insulation vacuum (Sebastien); Study RF properties of two scenarios for the pipe shape (Elias, Cockroft, Louvain) Re-think and possibly re-define the alignment/BPM precision needed, and the procedure to reach it (Keith, Louvain, Mike?) What has been assumed about beam momentum spread, emittance and detector distances in the acceptance and resolution estimates? Radiation shielding??? (Sebastien) Louvain plans to build a prototype pipe and test it in spring’06 for the stability, rigidity, etc.; a small prototype of the HPS is planned for the test beam studies with edgeless detectors at CERN in Sep’06 CERN will work on alignment issues (TS/LEA & SU with a Manchester RA??) BPM development may be needed (Cockroft & CERN?) Lines of attack in Louvain now:  Lines of attack in Louvain now Concentrate mostly on the pipe design: Pockets vs Long Indent Need urgently feedback on RF properties of a given design AND definitions of detector volumes AND required alignment precision In parallel watch & consider implications/ possibilities for integration scenario: Open Access (in ‘air’) vs Limited Access (in isolation vacuum) Need decision on this issue asap – otherwise very difficult to progress in the complete system design Pocket design I (B. Florins):  Pocket design I (B. Florins) Slide36:  Pocket design II (B. Florins) Slide37:  Indent design I (B. Florins) Slide38:  Indent design II (B. Florins) Slide39:  Plans: Build a moving pipe prototype in spring/summer (Which length? Both schemes?) to test it in the lab (robustness and precision) and at the beam in summer/fall’06 Arrive to the proposal of the moving pipe integration – is possible to reach that by summer’06? Strong and efficient interactions with the cryostat design are crucial… To reach these goals we need to set up the FP420 working group scheme/work plan starting Jan’06 Welcome on board!

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