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DC1 Assembly and Testing Status Report for MEG Project - March 2006

This report details the status of the DC1 assembly and testing processes as part of the MEG project. It covers the assembly of components such as the anode, cathode, and hood, as well as the delivery and testing of critical materials like foils and preamplifiers. The report includes measurement parameters, pressure stability tests, and findings on the performance of gas outlets and flow control systems. It highlights personnel contributions and outlines the testing schedule for further assessments in upcoming months.

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DC1 Assembly and Testing Status Report for MEG Project - March 2006

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  1. Status report MEG DC 13/2/2006 • Foil, cathode, hood, anode • DC1tests and measurements • Preamplifiers • Cables, connectors, cable panels, splitter + sum • Cable duct, DC support, minibag • Tests and Schedule

  2. All Foils delivered : resistance tested by REPIC : geometry checked New polyimide: UPILEX stronger, less sensitive to humidity

  3. Cathode : delivered after some discussion about planarity Hood: first 2 delivered for check, OKgiven for the 16 others Anode: delivered

  4. DC1 ASSEMBLED .1 mm precision to frame referencepointsreached for anode, cathode and hood

  5. DC1 ASSEMBLED • Production and mounting stopped to check HV-print-C edge stability (go to DC2) •  foil measurement epoxided C-fiber mount cathode test Hood first delivery + mount •  Simple HV test, HV-preamp test, set start value of parameters ( potential wire Voltage, ..) (go to DC2) •  Read out(go to DC2)

  6. More direct measurement to determine necessary pressure stability : • Gas outlet of DC in simple bag with same tubes as to manifold • source at a fix point in the middle of the surface • Vary flux through the chamber (0 to 50 sccm)  0 to 3 Pa and measure amplification variation with the current in the chamber •  CONFIRM DIRECT MEASUREMENT OF CHAMBER „EXPANSION“ • For sudden change (door, ..) • no change in pV (flow in = flow out) 2 mbar in He bag  .2% in pressure compensated by .2% in Volume = .1 mm = 1. Pa in (He bag-DC) • b) For change over 2 mbar at the rate of storm for 20 l ~ 2.6 cc/secflow controller (DAC) 1 Hz  correction per second < 1 Pa = .2 cc/secMKS 1179B at 200 sccm precise to .7% = .025 cc/sec • c) Diff. Pressure to be controlled < 1 Pawith range of 1 mbar, MKS 120AD .25%  .25 Pa

  7. 5. Gas pressure control Flow controller Flow controller He pump 1400 l .0 to .2 bar DC 16 x 1l < 500 Pa To Air 50% He + 50% C2H6 PDC PHe Flush in ~2 h ~ 150 sccm Storm ~ 500 Pa in/10 min = 8 Cc/min >1.8 bar PHe-PDC < 1Pa  .2 Cc, 14 Cc Dif. Pressure sensor

  8. Preamplifiers : With 6 V supply and 5 V regulator on the preamp chip input protection diode for 2.2 kV break down ~ 100, with old dimensions ~ 150, ~1.5 mm shorter and inclined connectors (5 different types) production continues Last prints and elements partly here, connectors offered with cables Tests with DRS and DC1 + DC_Al + small DC  factor 2 ? Preamplifier cooling (Malte) Some like it not hot and water cooled !!

  9. S Cables, connectors, cable panels, splitter + sum 1750 between ~250 cm and ~400 cm + 1750 ~750 cm long Precimation coaxial as in magnet , offered Suhner coaxial soldered on 16 channel print, attenuation + ~6 db Erni 34x2 pins (SMD?) connectors for 16 channels Splitter (1 kW) + S ampli

  10. Background in LXe from central part of cable duct (Hajime,..) number of g background event (low threshold) Distance to current position [cm]

  11. To larger radius Small level arm (near TC) Measurement by survey group of exact edgeshape at COBRA’s smaller radius ( being analyzed) Later measure welding circle at transition [edge – inner Cylinder] ( fix shape of DC Al fixing parts)

  12. minibag • Non negligible effect on DC precision because of additional multiple scattering • Effect smaller near the target or near the DC  both technically dangerous • Minibag is designed and will be constructed as test bag for: • tests with a few DC • Study of foil mechanical resistance

  13. DC tests • HV test with assembled DC : [anode prints, parameters for pressure behavior] • HV test with preamps and DRS with Sr90 and cosmics:[ preamps, DRS,..] • 6-11 April : test in pE(M)1 with minimal ionizing p (>150 MeV/c) or e 50 MeV/c) 1 DC + Al-DC[preamp, DRS, DC calibration, resolution,…] • 11-16(24) May : test in Cobra, Field on + e+beam with < 3 DC’s[DC behavior in Cobra background , 511 keV] • Eventually second test in pE1 with more DC [ better DC calibration]

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  16. Manpower Person        jan.-mar. 2006      apr.-jun. 2006 Johny             100%                100% Malte              90%                 80% Andi              100%                100% Dieter            100%                100% Florian           100%                100% Matthias          40%                 40% Hajime            60%                 60% Zdenek           40%                 40% Ueli               30%                 30%                  ------              ------                   6.6              6.5

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