Construction of the silicon tracker for the R3B experiment.

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Denis Oliver
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1 Construction of the silicon tracker for the R3B experiment. M.Borri (STFC) on behalf of the teams at Daresbury Laboratory, Edinburgh and Liverpool Universities. Outline: FAIR and R3B. Overview of Si tracker. Mechanics, sensors, ASIC, DAQ. Electrical and in-beam tests. Conclusion.

2 FAIR. Facilities for Antiproton and Ion Research (FAIR). It is an expansion of GSI. Secondary beams of highly unstable nuclei (up to 1 GeV/u). Produced by primary heavy ions beam hitting production target. Separated in-flight within 100 s of ns: Super FRS. High-energy branch for secondary beams up to Bρ max of 20 Tm.

3 R3B. Reactions with relativistic radioactive beam (R3B). Emphasis on nuclear structure and dynamics. Located in high-energy branch of Super-FRS. Kinematically complete measurements of reactions with high-energy radioactive beams. Unprecedented high efficiency, acceptance, and resolution.

Silicon tracker. Precise tracking and vertexing, as well as energy and multiplicity measurements. Conical shape. Detect light charged particles (like protons) from the target region.

4 Silicon tracker. Precise tracking and vertexing, as well as energy and multiplicity measurements. Conical shape. Detect light charged particles (like protons) from the target region. Double-sided micro-strip silicon sensors wire bonded to a custom made ASIC. 30 detectors: 6 in inner layer; 12 in each of the 2 identical outer layers. Total sensitive area 5600 cm ASICs equivalent to 116,736 front-end channels. Each outer layer: 384 ASICs (49152 chs); Inner layer: 144 ASICs (18432chs). Operated in vacuum.

5 Mechanics. Vacuum chamber made of Al. Total volume of 0.148m 3. 2mm wall: low material budget (2.2% of X0). Reached target vacuum: 1e-5 mbar. Support structure made of Al. Cooling system based on Cu (pipes and blocks) and H2O+Glycol (coolant). New Cu-blocks: better alignment; good thermal contact. ASIC temperature range: 0-70 o C.

Sensor. Sensor specifications Type double sided Bulk doping n-type Bulk thickness 300 µm [ABC] 100 µm [BD] Strip pitch 50 µm Strip width 38 µm Strip length variable Strip stereo angle 16.

6 Sensor. Sensor specifications Type double sided Bulk doping n-type Bulk thickness 300 µm [ABC] 100 µm [BD] Strip pitch 50 µm Strip width 38 µm Strip length variable Strip stereo angle 16.2 o Isolation implant p-spray Guard rings 9 floating I-leak per strip 3.25 na/cm [<100 na] Strip capacitance 2.3 pf/cm [<80 pf] BD detector for inner layer. ABC detector for outer layers. Starting production from ABC detectors. Sensor successfully assembled to carbon-fibre frame. It has I-leak<8µA@60V (op.voltage).

ASIC specifications Size 13x6 mm 2 CMOS process AMS 0.35 µm Power consumption < 1.

7 ASIC. Designed at STFC Rutherford Appleton Lab. The R3B ASIC is intended for reading out signals from the N and P strips. The chip provides three informations: 1. strip number. 2. energy deposit. 3. time of the hit. ASIC specifications Size 13x6 mm 2 CMOS process AMS 0.35 µm Power consumption < 1.5 W/ASIC Channels per chip 128 Data rate < 5 khz/channel Energy range 0-50 MeV Time stamp 200 MHz Readout based on a daisy chain sequence. Four ASICs are connected in a chain. They are not adjacent to each other. Rate in each ASIC proportional to the associated strip length.

Particular focus on : threshold tuning; front-end linearity; signal sampling; ADC to energy.

8 ASIC testing. Tests performed on bare ASICs. Front-end characterization performed with internal pulse. Comparing ASIC with its specifications. Particular focus on : threshold tuning; front-end linearity; signal sampling; ADC to energy. Pulse-mean [ADC] PulsePeriod@200us, PulseAmpl@0.5V, PeakTime@8.0us Asic e-mode h-mode Channel [a.u.]

9 DAQ. Control ASICs: set registers, distribute clock. Synchronize tracker with other sub-detector systems. Transfer data to experiment DAQ (NDAQ). MIDAS software: well established in UK nuclear community. Total of 3 utca crates: 10 FEE cards in each crate. 1 FEE card for each detector. Current cable has measurable x-talk, exploring other types.

Detector testing. Std.Dev.[ADC] 10 9 8 7 Pulse-std.dev. Vs Channel N-side Peak-time 1.0µs Peak-time 4.0µs Peak-time 7.0µs 6 5 4 3 2 1 Test-pulse injected in each individual channel.

10 Detector testing. Std.Dev.[ADC] Pulse-std.dev. Vs Channel N-side Peak-time 1.0µs Peak-time 4.0µs Peak-time 7.0µs Test-pulse injected in each individual channel. Input capacitance strip length. I leak strip length. Higher noise for longer strips. More uniform and lower noise with high shaping time. N.B. N-side has a broken daisy chain. Std.Dev.[ADC] Channel[a.u.] 10 Pulse-std.dev. Vs Channel 9 P-side Peak-time 1.0µs 8 Peak-time 4.0µs Peak-time 7.0µs Channel[a.u.]

11 In-beam GSI. GOAL: study reactions produced by a Ca48 beam hitting a CH2 target. MEAN: detect correlations of signals produced by particles in CALIFA and Si-tracker. OUTCOME: we acquired two data sets which could enable finding correlations. BUT: To achieve this goal we had to adopt several work around to overcome several difficulties. The scientific goal allowed us to test our detector system in terms of: 1. building. 2. mounting. 3. operating. 4. taking data. 5. analysing data. 2 / 2014 October 2014 Schedule as of 14-Okt-2014 Week 40 Week 41 Week 42 Week 43 Week U207, Backe/Block, 48Ca (EZR), Y7 SHIPTRAP U259, Düllmann, 48Ca, X8 U000, Barth/Hollinger, p (MUCIS), UNILAC U259, Düllmann, 48Ca, X8 U207, Backe/Block, 48Ca, Y7 SHIPTRAP U282, Ortner/Blazevic, Ca, 3.6MeV/u, pµa, Single Shot Experiment, 5Hz, Z6 UBIO, Scholz, Ca, X6 U259, Düllmann, 48Ca, X8 UB04, Groening/Spill er, U, UNILAC S438 Simon, Ca, block sharing, HTC S438 Simon, Ca, block sharing, HTC SMAT, Trautmann, MeV/u, Sm, HTA S00 S438, S411, S401Heuser/Kis, Ca, 0, S411, Taeib,Si Plaß/Pur S000, block sharing, HAD Spil S000, Spiller, U, SIS Plaß/Purushothama mon, U, ushotha Spiller, ler, n, U, FRS Nach man, U, U, SIS N, HTC, FRS S00 S401Heuser/Kis, Ca, 0, block sharing, HAD Spil S000, Spiller, U, SIS ler, N, S00 S417, S411, S438, S401Heuser/Kis, Ca, 0, SMAT, Trautmann, Nociforo/ Plaß/Pur Taeib,Si S411, block sharing, HAD Spil U, FRS Simon, ushotha mon, U, Plaß/Purushothaman, U, ler, U, 300- man, U, HTC, FRS N, 1000 FRS FRS E082, Litvinov, Sm, FRS-ESR, ESR E000, Steck, U, soweit möglich, ESR E098/E116, Bräuning-Demian, U, ESR, HTA Burkhard Kolb, Phone , beamtime@gsi.de 10/14/2014 3:48:00 PM

$Only operated a fraction of Det101. Main problems: data corruption, data repetition, high leakage current.$ Problems caused by: cabling (ongoing), firmware (fixed), detector assembly (ongoing). Data analysis started. Exp.

Problems caused by: cabling (ongoing), firmware (fixed), detector assembly (ongoing). Data analysis started. Exp.

12 In-beam GSI. 3 detectors to GSI. Det101 and Det104 are in front of CALIFA petals. Det103 does not have a CALIFA petal behind it. Only operated a fraction of Det101. Main problems: data corruption, data repetition, high leakage current. Problems caused by: cabling (ongoing), firmware (fixed), detector assembly (ongoing). Data analysis started. Exp.S438, cave C Run Target Thickness Beam type Beam energy CH2 4.98mm Ca48 550MeV/u [ADC] ADC vs TS: Pside (side1) spill ~25s TS[s]

13 Conclusion. The R3B silicon tracker is under construction. Mechanics, sensors, ASICs and DAQ are in an advanced stage. Tests allowed for an improvement of the setup.

ITk silicon strips detector test beam at DESY

ITk silicon strips detector test beam at DESY Lucrezia Stella Bruni Nikhef Nikhef ATLAS outing 29/05/2015 L. S. Bruni - Nikhef 1 / 11 Qualification task I Participation at the ITk silicon strip test beams