1 / 12

ATLAS micromegas

ATLAS micromegas. Progress report 17 March 2011. Large chamber with resistive strips. Dimensions: 1.2 x 0.6 m 2 (half of Large CSC), 2048 strips with 0.5 mm pitch Production of first chamber with resistive strips suffered a number of production problems Mesh not well stretched (waves)

cathy
Download Presentation

ATLAS micromegas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ATLAS micromegas Progress report 17 March 2011 J. Wotschack

  2. Large chamber with resistive strips • Dimensions: 1.2 x 0.6 m2 (half of Large CSC), 2048 strips with 0.5 mm pitch • Production of first chamber with resistive strips suffered a number of production problems • Mesh not well stretched (waves) • High-ohmig connection b/w mesh and detector ground (insufficient development of support pillars) • Production of second chamber prototype started beginning of March • Several provisions to avoid the problems encountered in 1st try Chamber after pillar development but before curing J. Wotschack

  3. Large resistive MM (CR2) ... cont'd • Chamber assembled a few days ago (Monday) • Connected to gas on Monday afternoon and applied HV a few hours later: no currents • First cosmic tracks seen on Tuesday morning J. Wotschack

  4. The very first events with CR2 • Connected one strip group to two APV25 hybrid cards = 2 x 128 ch • Trigger on cosmics with scintillators • Data are clean; zero suppression as on small chambers (not optimized) • Correct mapping between electronics channels and strips not yet done for these events (done now) J. Wotschack

  5. MM test in ATLAS cavern • In February the infrastructure for the MM installation was installed in the ATLAS cavern (thanks to the help and support of ATLAS Technical Coord. and Operation) • Location on HO (side A) 6th floor, close to beam • HV and ethernet cables were pulled from from HO to USA15 • Gas pipe from GSX1 to location close to rack • Small standard rack installed and connected to safety system (missing: rack connection to cooling water) • Identified a location in USA15 for HV mainframe and PC • Setup with four small MMs being prepared in Lab • 2 MMs for triggering (standalone trigger) • 2 MMs with 2D readout with 250 µm strip pitch • DAQ system for 1440 channels, including DCS and readout • Installation: hope to be ready for next access (end March?) or for sure for the one after that ... J. Wotschack

  6. MM project time line Following the request of the Muon Upgrade Management, here a preliminary time line for the MM project • 2011: Summer/Fall: Proposal • Construction of CSC-size chamber with several layers and xy readout (to be installed in ATLAS); fully equipped with first version of new VMM1 chip (BNL) • 2012: Technology choice (?) • Detector long-term tests and ageing studies (material choice) • Construction of full-size module-0 chamber with two multilayers and xyreadout, compatible with new Small Wheel design; fully equipped with VMM1 chip; commissioning of readout and trigger system • 2012/13: Design optimization & industrialization of production; setup of production, assembly, and test sites; MoUs • 2014-16: Construction and commissioning of 128 chambers • 2016/17: Installation on Small Wheel & commissioning J. Wotschack

  7. Plans for 2011 • March/April: install small MMs in ATLAS cavern • March/April: 2nd plane for large chamber (mirror symmetric) to have a double layer module back-to-back • May: test large chamber in neutron beam (?) • Test beam July: test double-layer chamber + 2D • Summer/fall: construction of full-size module with several active layers • October: 2nd test period to test full-size chamber and first version of new BNL chip J. Wotschack

  8. JoergDubert’s Questions • as you all aware we currently do not yet know how the final mechanical design of the new Small Wheel will look like. Nevertheless, in the end the available space for detectors will be quite similar: - in the x-y plane the maximum size will be approximately that of the   current CSCs or MDT chambers. Of course, in the radial direction the   new chambers could be smaller and their number increased. In the   phi-direction the size is more or less fixed as we want to keep the arrangemnt in 16 sectors. - in the z-direction the space will be about 25-40 cm, depending   whether we can profit from an additional wall of neutron   shielding. • If possible we still envision the new Small Wheel to use only one single type of chamber (which could of course consist of a mechanically integrated sandwich of technologies if needed), i.e. we want to avoid regions with different technologies like the current CSC and MDT/TGCs.

  9. Mmegas-based Strawman Detector Toy Detector just to get a rough idea what could be possible and approximate channel count Two basic criteria: 1. At least one dimension of the chamber must be <= 1100 mm 2. Channels/plane give a sensible chip count with strip width ~0.5 mm

  10. The resulting “Parameter Table”

  11. Total width easily within 40 cm • Generate track at a given angle • Track crosses a strip at a random position • Generate primary ionization clusters Poisson distributed • Generate number of electrons for each cluster • Take strip with earliest time and charge over a certain threshold as the track’s coordinate Strip pitch = 0.5 mm Reconstruct track and compare slope with the generated one No transverse diffusion considered but effect is negligible for the first arriving cluster

  12. Services • Power needed 22 kW (Have 18 kW presently for CSC) • 2 M channels with <10 mW/ch front-end chip ≈ 20 kW • 1 GBTx (optical fibre) link/chamber adds 1-2 mW/channel • Existing cooling more than adequate (only use ~15 l/min/loop, 4 loops) • Existing MDT Gas Infrastructure adequate • Optical fibers assuming 1 link/Chamber 128-256 (depending on max size) Already have 320 for CSCs • HV needs further studies to devise a distribution strategy

More Related