UA9 layout on SPS

Gianluca CavotoINFN Roma

Crystal collimation workshop CERN

25/27 Oct 2010

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UA9 @ SPS

Circumference : 6.9 km UA9 collimation region

Oct 25th 2010

Data-taking during dedicated Machine Development days with SPS beam in coast mode (~5 in a year).

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Collimation region

Oct 25th 2010

Protons hitting the crystal

✖

Intercepted by LHC collimator

Imaged byMedipix

Absorbed by secondary collimator(TAL)

BLM Cerenkov

BLM Scint

BLM Scint

65 m

Inelastic interaction of protons in the crystal

BLM GEM Deflected beam

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Out of collimation region

Second TAL (TAL2 Al scatterer)

Oct 25th 2010

Scatterer + BLM (scint and Cerenkov) in highly dispersive regionMeasure the effect of inelastic and quasi elastic [diffractive] events

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IHEP tank

Oct 25th 2010

IHEP gon.

Scint B & LCrystal 3 and 4

IHEP goniomenter

GEM1

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Crystal in IHEP tank

Oct 25th 2010

Quasi mosaic crystal Strip crystal

Crystal 3Crystal 4

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Ex-RD22 CERN tank

Oct 25th 2010

Scint C

Two goniometer (crystal 1 and 2)One W scattererOne Cerekov detector

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GEM2

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LHC collimator (phase 2)

• Instrumented with LHC-type BLM

Oct 25th 2010

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Roman Pot 1

• Instrumented with Medipix on both horizontal pot

Oct 25th 2010

Online!

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Roman pot 2

• Close to TAL, better place to see channeledbeam

• No detectors yet• 2 H and 2 V pots for

Medipix

• Relevant to measurechanneled beam direction (from centroid)and flux of proton of channeledbeam

Oct 25th 2010

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TAL absorber

Oct 25th 2010

Monitored with scintillator (out of vacuum)And Cerenkov (on the W absorber)

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TAL2 in missing magnet half-cell

Oct 25th 2010

Al scraper/scatterer

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Alignment procedure

Crystal and all UA9 movable devices are aligned during each fill.

Now standard and fast procedure to find channeling configuration and collimation.

Oct 25th 2010

LHC collimation alignment

Rate increase: stop!

Several secondary channeling position

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Summary

• UA9 layout is now well established• Need to instrument RP2 with 4 Medipix• Need to add our BLM scint close to SPS collimator

• Hardware and DAQ are working– No big failure but keep on eye on radiation

damage of Medipix

• Many more details in the following talks

Oct 25th 2010

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