1 / 13

Duke Aging Test 7 Chiho Wang Duke University

Duke Aging Test 7 Chiho Wang Duke University. Test Setup. Test 7 (module 2) 15 wires in Xe-CO2 volume 2 plain wire (reference) 5(old)+1(new) glass (G) 5(old)+2(new) mylar encapsulated glass (GE) 19 wire in Xe-CF4-CO2 volume 2 plain wire (reference) 1 plain in high gain

yoshio-mosley
Download Presentation

Duke Aging Test 7 Chiho Wang Duke University

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. Duke Aging Test 7 Chiho Wang Duke University

  2. Test Setup • Test 7 (module 2) • 15 wires in Xe-CO2 volume • 2 plain wire (reference) • 5(old)+1(new) glass (G) • 5(old)+2(new) mylar encapsulated glass (GE) • 19 wire in Xe-CF4-CO2 volume • 2 plain wire (reference) • 1 plain in high gain • 4 thinner Au wires • 4 PI wires • 4 GE wires • 4 peek (of the 4 wires, 2 in high gain 2 in low gain)

  3. Accumulated Dosage • Averaged dosage (~90cm) each wire (C/cm) • Radiation is enhanced at the central region. Local dosage (~20 cm around wire joint) should have 2-3 times of the average.

  4. Wire Tension Loss • In Xe-CF4-CO2 there seems to have more tension losses. This may be due to the fact that they are all new wires and are just settling down(?) • In Xe-CO2 volume, the circled ones are new wires, the rest are old wires.

  5. Gas Gain Monitor • A Fe55 source was mounted on a stepping motor to scan the module 4 times a day. • Each scan takes ~12 min.. During that time Sr90s were shut off and HV restored to nominal voltage. • ADC data were taken at 26 positions along the straw with an 1.5” interval. • Step 1-14 are upstream of wire (wire joint is offset from center to face 2nd 50mCi Sr90 source) • Step 15-26 are down stream of wire • legend of subsequent plots:

  6. Bare Glass, Gain vs Time in Xe-CO2

  7. GE, Gain vs Time in Xe-CO2

  8. GE, Gain vs Time in Xe-CF4-CO2

  9. Peek, Gain vs Time in Xe-CF4-CO2

  10. PI, Gain vs Time in Xe-CF4-CO2

  11. Cleaned Not Cleaned Thin Au, Gain vs Time in Xe-CF4-CO2

  12. Regular Plain Wire

  13. Summary • 4 types of the wire joints (glass, GE, Peek & PI) have been irradiated ~ 2-3 C/cm near wire joint. • No obvious degradation in wire tension slippage. • Not much of wire darkening compared to previous run. • Gain losses were seen in Xe-CF4-CO2 volume, consistent to local irradiation rates. • No gain decreases were seen in Xe-CO2 volume. • Wire joint type does not affect gain • Wire cleaning does not affect gain • Thinner Au wires suffer more gain loss than regular wires

More Related