J.M. Heuser – CBM Silicon Tracking System 1

Update on Microstrip Detector R&DUpdate on Microstrip Detector R&D

Johann Heuser, Johann Heuser, 6 October 20096 October 2009

J.M. Heuser – CBM Silicon Tracking System 2

22ndnd full-size double-sided microstrip full-size double-sided microstrip detector prototypedetector prototype

ConsortiumConsortiumGSI-CiSGSI-CiS

22ndnd radiation tolerant test structures radiation tolerant test structuresGSI-CiSGSI-CiS

Prospects for other radiation hard detectorsProspects for other radiation hard detectors

J.M. Heuser – CBM Silicon Tracking System 3

1) Full-size prototype CBM01 (rad soft)

4" wafer, 285 µm Si

2) CBM02 –rad tolerant designs

main detector 15° stereo angle

50 m strip pitch

90° test detectors

Successors to: 2 next full-size prototypes: r/o pin-compatible with each other

• 60 60 mm

• 1024 strips/side

• 58 m pitch 7.5 deg stereo angle

• double metal on 2(1) sides

Baby detectors + test structures:

• for systematic studies

• before/after irradiation and in-beam tests with readout electronics

J.M. Heuser – CBM Silicon Tracking System 4

Status:Full-size prototype:

1) Consortium/MSU design final since Summer 2009

Production of 60 40 mm2 detectors ongoing at RIMST; dummy wafer (Al layers) produced 10/2009 (financed by STS Consortium)

see overview of Y. Murin

J.M. Heuser – CBM Silicon Tracking System 5

Full-size prototype:

2) Design 60 60 mm2 at CiS

financed by GSI (~ 35 kEuro, within UF-FP7 ULISI) ongoing Complicated! Finished not before the end of the year production until Spring/Summer 2010

4" mask

space for the big sensor

+ two baby detectors (?)

J.M. Heuser – CBM Silicon Tracking System 6

Status:

New "technology wafer":

Accepted as BMWI-R&D project of CiS together with GSI (Jan/2009 – July 2011)

J.M. Heuser – CBM Silicon Tracking System 7

Project with Helsinki Institute of Physics, Finland / CERNProject with Helsinki Institute of Physics, Finland / CERN

CBM test structures on CBM test structures on 150 (300) 150 (300) m n-type MCz material: m n-type MCz material:

Thin single-sided microstrip detectors with Thin single-sided microstrip detectors with AC coupled r/o strips AC coupled r/o strips

J.M. Heuser – CBM Silicon Tracking System 8

1. CBM test object for thin inter-mediate STS-MVD station:

Single-sided wedge detector, r-strips, 25/50/100 m pitches,in 3 groups of 128 strips, AC r/o

2. CBM test object for thin&single-sided detectors, compatible with current baby detectors:

Single-sided small baby sensor, 50 µm pitch, 256 strips, AC r/o

3. Main sensors, 50 µm pitch, 768 strips (J. Härkönen, RD39/50)

1. Wafer layout

n-type 6” wafer

1 2

3 3

3 3

RD50 wafer: Two CBM test structures with p-strips in n material would fit in a "half moon" area, plus a few pin diodes etc.:

J.M. Heuser – CBM Silicon Tracking System 9

2. Wedge layout

128 strips, 100 µm pitch

128 strips, 50 µm pitch

128 strips, 25 µm pitch

• 30º sector

• 2 AC pads + 1 DC pad per strip for test purposes

• Try out 3 various strip pitches

• Each group of strips is compatible with n-XYTER FEB + Al/Kapton pitch adapter cable (tab-bonded)

Close-up of the wedge corner. Bias structures/AC pads on alternating sides of the wedge.

Schematics of arrangement of strips on the wedge

poly bias DC pad AC pad

J.M. Heuser – CBM Silicon Tracking System 10

3. “Baby” detectors

With 50 m strip pitch, 256 strips do fit the interior region of the detector, including guard and bias rings.

The external dimensions specified fit already existing CBM test boards.

The strips themselves could most likely be identical to those of Jaakko's detectors.

J.M. Heuser – CBM Silicon Tracking System 11

Current status:

will not be realized on the RD50 wafer (due to cost reasons)

but on a separate wafer, to be built at VTT, Espoo, Finland

funding has been applied for in Finland, with a finish foundation

production ... open, goal: in 2009

no further progress since last report March/2009

not clear when/whether this will converge

J.M. Heuser – CBM Silicon Tracking System 12

Ioffe Physical-Technical Institute, St. Petersburg

V. Eremin et al.

interest in joining CBM

motivation: application of its long-term experience in physics and development of silicon radiation hard detectors.

Two tasks for the participation are proposed:

1) Complementary radiation study which will accompany the STS double side detectors (DSSD) development, prototyping and mass production, development of operational scenario for the STS DSSDs.

2) Development of alternative Technologically Effective Approach for the STS detectors based on thin single sided microstrip detectors (SSSD) and future fabrication of pilot set of the detectors.

under discussion in CBM-MPD STS Consortium and ...

J.M. Heuser – CBM Silicon Tracking System 13

Detector device simulationsDetector device simulations

• Software packages have been set up• Now ready to be directed to CBM specific R&D problems• back up design at CiS and coming irradiation studies

see talk by Sudeep Chatterji