Kenneth Wraight, Andrew Blue, Kate Doonan & Sam Crawley

SLAC

Kenneth Wraight, Andrew Blue, Kate Doonan & Sam Crawley

421/04/23

SLAC

Andy Blue

521/04/23

End Station A

Remote control required.

Andy Blue

621/04/23

Parasites & Particles

•ESTB is parasitic beam from Linac Coherent Light Source– Secondary beam of electrons up to 13.6GeV of LCLS beam– 5Hz standard bunch frequency– Variable particle number per bunch–

•SLAC benefits– Triggering available from– beam– Larger region of

– interest than previous

– scintillator limited area

– Reduced multiple scattering– Possible to take data with

– more devices in beamAndy Blue

721/04/23

Beam Conditions

•Data taken with various conditions– 5 & 10Hz frequencies– dependent on LCLS users

– Varying charge per bunch– Dependent on LCLS users

– some control with beam slits

– Consistent beam energy of 12.5GeV

•Used multiple devices in beam– 2 – 4 devices used --> 6 – 10 sensor planes– Limited by available power, mounts and cooling for devices– More made as testbeam developed

Andy Blue

821/04/23

Telescope and device setup

•Telescope visiting from DESY from April to July

Beam side(Mimosa 0)

Far side(Mimosa 5)

Devices<-- mounted

andcooled -->

Andy Blue

921/04/23

(Remote) Control of devices

•EUTelescope– Config for runs (devices)– (semi-)Online monitor (not full quad monitor)

•RCE– Usd to read out pixel devices– Setting configs and thresholds

•DCS– Voltage settings (HV > 500V, low voltages were 1.2V & 1.5V)– Humidity & temperature monitors

•Teamviewer– Linked to laptop in beam hall– Peltier control and additional temperature monitoring

Andy Blue

1021/04/23

Itinerary

•Tue 28/4 arrived in Palo Alto•Wed 29/4 arrived SLAC: training and registration •Thu 30/4 access to ESA: basic tour•Fri 1/5 set-up and tune devices, begin data taking with Q5

– Found out customs holding irr. devices over weekend

•Sat 2/5 data taking: Q5 and singles– 10Hz periods, variable beam conditions

•Sun 3/5 data taking: singles•Mon 4/5 set-up for irr. devices, data-taking: singles

– Receive irr. devices around noon; irr. quad and 125x100 broken

•Tue 5/5 data-taking: singles + Igor's angled measurements•Wed 5/6 dismantle set-up

Andy Blue

1121/04/23

Data taken

Unirradiated•Quad – data taken: 3 regions @ 100V, THL=2500 & 3000e•250x50 – data taken: 50 & 100V, THL=2500e•500x25 – data taken: 50 & 100V, THL=1.5, 2, 2.5, 3 ke•125x167 – data taken: 50 & 100V, THL=2500 & 3000 ke

•irradiated•Quad – no data: unable to tune, 8mA @ 15V (no analogue)•250x50 – data taken: 0V, THL=1.5, 2, 2.5, 3 ke (broken bonds?)

•500x25 – data taken: 100V, THL=1.5, 2, 2.5, 3 ke•125x167 – data taken: 100V, THL=1.5, 2, 2.5, 3 ke

Andy Blue

1221/04/23

Irr. 500x25 IV

•Limited bias of device due to large leakage current

Andy Blue

1321/04/23

Initial cluster scans

•Used online monitor and initial clustered reconstruction to check data quality

2k triggers

2k triggers

Andy Blue

125x167 structure

14

Can see structure in 125x167 online monitor

Unbonded pixels due to mismatch of geometry

1521/04/23

Experience

•Facility– Very helpful local support: from equipment to personnel– >21hrs beam/day (2hrs MD); always updated by MCC– Presence of other users important i.e. 5->10Hz (+ beam energy)

•Telescope– After ironing out a few bugs, everyone gained experience– Important to have experts available: Martin, Igor, Jens

– Bonus of triggering from beam– DCS system was simple and easy to use: Voltage, humidity, temp

•Detectors– Despite customs trouble, managed good runs– Multiple devices tested in beam (e.g. Q+2sc, 4sc)

Andy Blue

1621/04/23

Conclusions

•Experience of facility very positive– Most training could be done online prior to arrival– Local support very helpful: Philippe Grenier, Max Swiatlowski– Very helpful with equipment & requests: cabling, dry ice

•Great experience for testbeam team– Running all aspects of data-taking from Peltier cooling to configuring

telescope

•Excellent beam conditions– Triggering: larger RoI– Energy: more devices possible per run– Potential for increased statistics in future

Andy Blue

17

Advice for Strips work

•Proposal needed– Sergio will write 1 for FCF work

– Volunteered to help write the abc130nm proposal– Being a registered SLAC user should hopefully help

•Contacts– For telescope issues, Igor Rubinsky

– For SLAC/facility issues, Philippe Grenier & Carsten Hast

•Data taking– Can tune beam spot to less than we had

– Can control no. electron per bunch from 1-3 to 100 (at 5Hz)– Are we anywhere near max occupancy for some of these numbers?

– After alignment data taking time should not be too long

•Reconstruction – Currently standard for pixels

– More than happy to use our experience to help adapt for Strips– CMS already tested strip devices with this telescope. Access to recon?...

1821/04/23

Back up

•Back up

Andy Blue

Triggering

1919

Scintillator Quad Module

Reference sensor

•Trigger is from a scintillator attached to 1st telescope plane–Only a fraction of coverage of 1 CMOS chip

Quad RoIs

•Use automated stage to change position of beam–Beam size of ~2x2cm (Perfect!)

Centred

Beam Left of Centre

Beamup from Centre