1 Aging Study for SiD Hcal and Muon System RPCs (University Linear Collider Detector R&D, project 6.19) Changgo Lu, W. Sands, K. T. McDonald, A.J.S. Smith.

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Presentation transcript:

1 Aging Study for SiD Hcal and Muon System RPCs (University Linear Collider Detector R&D, project 6.19) Changgo Lu, W. Sands, K. T. McDonald, A.J.S. Smith Princeton University February 15, 2010

2 Outline Review of the main motivation. Where we are standing after 6 months?  Set up a cosmic ray trigger array;  Finished second round of aging test, confirmed the aging phenomena from the first round test, on which we proposed this R&D project;  Purchased a Nikon microscope;  Microscope study of the aged RPC inner surface and Bakelite samples exposed to HF vapor; Plan for next 6 months and additional two years of the R&D.  Develop new variant Bakelite to improve the resistance to HF vapor.

3 Review: original motivation of project 6.19 Address aging issues in RPCs built from the new type of Bakelite developed by the BESIII Muon group of IHEP (Beijing) and Gaonengkedi, Inc. (Beijing) for use in the BES III and Daya Bay Muon Systems; RPCs using this material have achieved acceptable dark noise rates without Linseed oil coating, but aging effects have not been thoroughly studied - there is no published report available on this topic; A preliminary study of Daya Bay Muon System RPCs has indicated a significant aging effect that must be understood and mitigated prior to use of this technology for SiD; In the longer-term, a collaboration with IHEP and Gaonengkedi will lead to develop new variants of Bakelite that are more resistant to aging.

4 Where do we stand after 6 months of working? 16 strip scintillation counter trigger array for cosmic ray test set up and operating Assembled 5 BESIII-type aging test RPCs; Finished second round aging test for these chambers; Purchased a Nikon microscope to study surface morphology before and after the aging; Verified the aging test results from the first round of aging test — w/o oil coating BESIII-type RPC is vulnerable to HF attack; Developing new variant Bakelite electrode based on our aging test results; Preparing for third round of aging test with new RPCs made out of new-type Bakelite electrodes.

5 What we have done: Test set-up Upper trigger array (x and y, 4 for each). Bottom trigger array (x and y, 4 for each). Copper plates, Co-60 source sits on. Aging test RPCs.

6 Evolution of test RPC’s efficiency 38 (97) days are equivalent to 2.2 (5.6) years of cosmic ray run. Day 97 Day 38 Day 0 Aging dose: 1 month ~ 21 months of normal cosmic ray operation. Oiled RPC BES RPC #4 (unoiled) BES RPC #8 (unoiled)

7 Aged RPC inner surface RPC#4RPC#6 RPC#7 RPC#8 Opened the aged RPCs we can see very dense sparking marks populated all over the inner surface. RPC#8 has much smaller size sparking marks. The microscope images of the inner surface are shown in the following slides. Sparking marks Small sparking marks, display slide in larger scale will see them.

8 Microscope study: aged RPC inner surface 100 pixels scale bar equals 0.16mm in length. RPC#4 sparking spot RPC#6 sparking spotRPC#7 corroded surface RPC#8 less corroded surface

9 Future plan: Develop variant Bakelite We now know the oil coating can protect the Bakelite surface from HF attack. Based on this observed fact our Chinese collaborator is developing new techniques to integrate this coating into the Bakelite production procedure. We have obtained some small sample pieces. The surface smoothness is not as good as ordinary Bakelite, it certainly needs further improvement. We are also developing mirror quality surface Bakelite sheet. The existing production facility in Hebei China can produce such Bakelite, but more expensive. The goal of this R&D is lower the cost, make it affordable. Another by-product from this R&D is thin Bakelite sheet. We have produced 0.33mm thick Bakelite sheet, which has good potential application for making double gap RPC and mRPC. 2mm Bakelite 0.45mm Bakelite Thin Bakelite sheet

10 Future plan: 3-d round of aging test 5 new RPCs that made out of new variant Bakelite have been assembled, their initial performance has been checked. The new Bakelite used different resin, which mixes Linseed oil into normal resin. Preliminary test shows its resistance to HF is somewhat better than original BESIII Bakelite. Aging test on these RPCs will tell us if this technique works. At the same time our Chinese collaborators will develop more variant Bakelite. It could be a long learning process, through try and error we’ll find our best solution.