CMS High Eta MPGD Upgrade Andrey Marinov CMS

CMS High Eta MPGD Upgrade Andrey Marinov

CMS Detector RE 1/1 Region 2

CMS GE 1/1 Introduction 3

GE 1/1 Advantages for CMS • GE 1/1 detector can provide triggering and tracking information – Improve the trigger (we can go to a very small granularity 0. 1 -0. 5 mm pitch) • GE 1/1 is a high rate detector – required for SLHC and high eta region in CMS - 10 KHz/mm 2 • High efficiency and good time resolution • GE 1/1 is not working with flammable gas – Ar, CO 2, CF 4 4

CMS GE 1/1 prototype description Shielding Openings for VFAT electronics Readout Frame GEM Foil Drift plane HV divider Spacers Gas grooves 5

CMS GE 1/1 prototype description II Detector Active area: 990 x (220 - 445) mm Drift gap 3. 00 mm GEM 3 T GEM 3 B GEM 2 T GEM 2 B GEM 1 T GEM 1 B Anode • Single mask GEM technology T 1 T 2 Induction gap • 2. 00 mm 1 D readout • Gas mixture: Ar/CO 2 (70/30) 2. 00 mm • Gas flow: ~ 5 l/h 2. 00 mm Single Mask technology will be used for large size detector and mass production! 6

CONSTRUCTION OF THE LARGE PROTOTYPE - CMS GE 1/1 7

CMS Prototype GEM - Stack 8

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CMS Prototype GEM - Stack GEM foils 10

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GE 1/1 3 D Model Alu. Cover Readout PCB GEMs Spacer frame Drift Electrode + Alu cover 12

GE 1/1 Drift Electrode Cu Foil – 5 um Kapton stack 300 um (75 + 100 +75 + 50) Aluminum plate 3 mm The operation voltage is 4. 5 k. V The leakage current is 20 n. A in open air Working point 13

Production of CMS Single Mask (SM) GEMs Single Mask technology eliminates alignment of the holes issue Size 990/45. 5/22 mm 14

HV test of the GE 1/1 GEMs Before and after stretching and framing, the GEMs are passing QT of the GE 1/1 1. Optical inspection 2. HV test before stretching 3. HV test after stretching → Applying up to 500 V between the top sector and the bottom layer plus the 2 neighbor sectors as well. Testing sector by sector 15

HV test of the GE 1/1 GEMs Criteria - Current less 10 n. A Results of the HV test. Sectors/Voltage/Current 16

GEM single mask process Chemical Polyimide etching Copper electro etching Stripping Second Polyimide etching Reality 17

Stretching and Framing Procedure for GE 1/1 GEMs Gluing the spacer frame on the GEM foil. 18

Stretching and Framing Procedure for GE 1/1 GEMs The GEM foil, with glued frame, stays in the oven heated up to 37 o. C over 24 hours. 19

Glued drift and 3 gems 20

Glued drift and 3 gems 21

Weights on top 22

Corners 23

Waiting for the readout in safe 24

Without weights 25

3 D Model of GE 1/1 Alu. Cover Readout PCB GEMs Spacer frame Drift Electrode + Alu cover 26

Readout PCB 128 channels per connector 256 strips for each eta partition 0. 8 mm pitch 1. 6 mm pitch PCB thickness = 3 mm

GAIN: SM 10 cm x 10 cm Single GEM • Ed = 2 k. V/cm • Ei = 3 k. V/cm • Rate ~ 180 k. Hz/mm 2 • Spark voltage ~ 530 V • Max gain ~ 1080 28

Gain: Triple GEM GE 1/1 Proto 29

Beam Tests 30

Beam Test @ RD 51 setup (H 4 – SPS) Tracking telescope GE 1/1 31

RUN = 37 – 181 Thr = 40 Vu Lat = 14 Position = P 1 Data-taking focused on different points along the GE 1/1. Preliminary results show good performance. 32 CMS/GE 11_efficiency_p 1_09012011 RUN = 175 HV = 4. 50 k. V I = 738. 90 u. A Thr = 40 Vu η = 99. 5% Position = P 1 CMS/GE 11_Sp. Res_p 1_09012011 Preliminary results

CMS GE 1/1 - Evolution Several feasibilities studies Meetings GE 1/1 The very first idea. Sept Oct Dec At the RD 51 setup we performed further studies with small single mask prototype. Integration studies, gas flow, mechanics, electronics, detector performance… Starting weekly meeting with strong support from DT, RD 51 collaboration. Nov Test. Beam 2 Jan Feb Mar Apr May Jun Jul Ago Sep 2009 Interests Few groups expressed interest. Lab tests Setup preparations in the lab. Test. Beam 3 The GE 1/1 is beingsuccessfully tested! Oct Nov Dec 2010 Test. Beam 1 At the RD 51 setup we tested timing performance of small prototype. Detector is ready! The construction of the first GE 1/1 is finished. Jan 2011 GE 1/1 proto II Started working on the second prototype. The detector GE 1/1 has been designed, built and successfully tested within a year! 33

Near future • Producing new GE 1/1 Prototype 2 with reduced drift and T 1 gaps, using thermo stretching method • Producing new GE 1/1 Prototype 3 with reduced Drift and T 1 gaps by using a new self stretching method – Small 10 x 10 cm sample is under tests at the moment. 34

Thank You 35