SLAC ESTB Workshop – March 20111

Test of the SSD Electronics for the STAR HFT Upgrade

Howard Matis - LBNL

SLAC ESTB Workshop – March 20112

Previous Uses (2007) of Electron Test Beams LBNL’s Advanced Light Source – 1.5 GeV e’s

LHC luminosity monitor

H. Matis (hsmatis@lbl.gov)3 Vertex 2003

1.5 GeV electron source (ALS)

Quadrant with (left) and without (right) electron source applied.

Test of MAPS pixel sensor

SLAC ESTB Workshop – March 20114

Usefulness of the ex-ALS Beam Easy to schedule time Flexible use of beam Lots of setup and debug time Access detector almost anytime Good technical support Platform for mounting apparatus Trigger counters in line Not useful for physics experiments Experts to beam tune

Other wishes Patch panels Easy way to have single point ground Silicon telescope (not sure how to interface it with our system)

SLAC ESTB Workshop – March 20115

STAR at BNL is adding an inner tracking detector Building a 2 layer

MAPS detector – very thin with 20 µm pixels (See L. Greiner’s Talk)

A larger Silicon Pixel Detector - IST

A “refurbished” Silicon Strip detector – SSD Originally designed to

run at 1 Hz Must now run at 1000

Hz

SLAC ESTB Workshop – March 20116

SSD upgrade Detector silicon remains

the same Dual sided silicon 768 strips/module 75 mm × 42 mm 95 µm strip pitch 35 mrad angle r-φ= 20 µm; z =740 µm

New Analog to Digital Readout RDO – Collector of Digital

Data which sends it to DAQ We need a test beam to

verify performance of new electronics

SLAC ESTB Workshop – March 20117

Schematic

SLAC ESTB Workshop – March 20118

Actual SSD Module

Module Before electronics folded Final version

SLAC ESTB Workshop – March 20119

Why we want a real beam Test of electronics with real particles Proper ionization values

Too often tricked with Fe55

Good way to measure rate affects Can trigger on a beam Efficiency Tests

SLAC ESTB Workshop – March 201110

Layout of Test

Parameters required for Beam Tests

Beam parameters Value Comments

Particle Type electron Could also use pions or hadrons

Energy > 3 GeV As high as possible

Rep Rate 4 to 1000 kHz Test rate effects

Charge per pulse 1 > 4 µs gap per pulse

Energy Spread Does not matter

Bunch length rms Does not matter

Beam spot size, x-y 2 cm × 2 cm Want to test whole detector without moving

Others (emittance, …)

Logistics RequirementsSpace requirements (H x W x L) 8” 8” by 3” high + trigger ⨉

scintillatorsDuration of Test and Shift Utilization One or two days; Come back in a

few weeks; Day to setup. Desired Calendar Dates 2012Spring11

SLAC ESTB Workshop – March 201112

Not my project

SLAC ESTB Workshop – March 201113

UCLA IEP/RHI Group(Huan Z. Huang, G. Igo, S. Trentalange, O. Tsai)

New R&D for W powder SciFi (scintillating fiber) calorimeters

Possible applications in STAR at RHIC:STAR forward upgrades

Transformation STAR eSTAR ➞Dedicated EIC (Electron Ion Collider) detector

Simple to build in a university environment, cost effective, flexible technique to build compact sampling calorimeters. We plan to have test run in the fall 2011.

SLAC ESTB Workshop – March 201114

INTERACTION POINT (June 20, 2003)

“Cooperative Spirit of SLAC Pays Off for UCLA Researchers.”

Test Run T466 at SLAC

•In 2003, tested smallEMC prototype at SLAC•Refined construction technique in 2004 •Scheduled for a test run at SLAC in the fall of 2004•Test run was postponed•Not able to continue R&D in this direction•Now ready to resume

This method of building ScFi calorimeters has yet to be proven!A SLAC Test Beam Facility is very important for calorimetry R&Ds!

SLAC ESTB Workshop – March 201115

• As a proof of principle, we want to build 4 towers x 4 towers EMC prototype using new technique. We call it “spacardeon”• Each tower will be about 20 rad.

length long• a bit more then 1" x 1”

•If funds available will try to investigate possibility of building a “SPACAL”• hadronic calorimeter using W powder/SciFi.

Beam

Parameters required for Beam Tests

Beam parameters Value Comments

Particle Type e

Energy 1 - 10 GeV The higher the better

Rep Rate 1000 Hz or less

Charge per pulse 1 e- Variable 1-3 e-

Energy Spread 1%

Bunch length rms <1 cm

Beam spot size, x-y 2 2 cm or less⨉Others (emittance, …)

Logistics RequirementsSpace requirements (H x W x L) 1.5 m 1.5 m 2 m ⨉ ⨉Duration of Test and Shift Utilization Depends on rate, one week, 12 or 2 8 or 3 ⨉ ⨉

8 hoursDesired Calendar Dates Late summer, fall 2011

16 SLAC STB Workshop – March 2011

SLAC ESTB Workshop – March 201117

Summary Test beams have been very useful in the past

Detector R & D Production of detectors

Lack of test beams in the US BNL does not have one ALS stopped providing it Fermilab? Jefferson Lab? CERN is expensive and difficult to use

A SLAC test beam would fill a natural gap Easy to use for those on the west coast

SLAC ESTB Workshop – March 201118

Backup

SLAC ESTB Workshop – March 201119

Example. Possible evolution of calorimeters in STAR. Forward direction (West side).

Should consider:Available spaceMagnetic FieldRadiationInstallation/Integration