Dee in testbeam

Proposal P Bloch, C Seez, Y Sirois

Dee calibration in test beam

Last period of 2006, November

Heavy ions, so highest E ~ 100 GeV

Challenge To use existing H4 infrastructure

Goal Get maximum benefit for EE (and ES?)

4x5 SC arrayfor the test beamin Nov 2006

Dee Calibration Nov 2006

VPT sorting by SC position

Old data

Mean ~33 e/MeV now

TT26=1.57

TT19

=2.5

SC region on Dee

Backplate angle as for beam from CMS I.P.

‘Any 5’ trigger map

DCCboundary

TCCboundary

Appropriate any five trigger mapping

Problem of OPAL frames

Dee frame is an enormous device 3,6 tonnes in weightWill exceed EB turntable weight limitUse it only to transfer Dee to H4, if at all

Dee backplate ~ 1.9 tonne with crystals

Mount Dee on plinth on the H4 turntableDee backplate angled to beam with appropriate support struts

Need FEA to check Dee rigidity

This part of Dee empty,

No weight

Beam

Avoid pivot support

Avoid vertical movementscrew

Special H4environmental screen

Dee on H4 turntable

Benefits of the proposed siting of Dee on turntable

Vertical rotation - in 2004, SCs moved in an arc – difficult to follow- 2005 scheme SCs move ~vertically- unfortunately radius of rotation only ~ 1m

Horizontal rotation - in 2004 adjacent SCs were not horizontal after rotations in the vertical - 2005 scheme, a better x-y grid of xtal positions for data taking/analysis

H4 turntable constraints

Readout needed for 20 SCs 100 trigger GOH 20 data GOH

Short fanouts on DeeFE – DCC 20 optical lines = 2 short fanouts (24 lines)FE – TCC 100 optical lines = 9 short fanouts (108 lines)MEM 24 optical lines = 2 short fanouts

Totals 144 optical lines 13+1 = 14 short fanouts

MPO trunk cables from Dee to H4 CR(barrel had MFS trunk cables at SM10 end)2 trunk cables 2*96 = 192 lines+1 trunk cable for CCS/token rings/MEM

Dee patch panel

MPO MPO

H4 control room

Short fanout trunk cable

UK opportunities

Monte Carlo appraisal Comparison – testbeam to Monte CarloIdentify particular regions needing close study Use current geometry in OSCAR or update to

XML?Way in to EE/ES reconstruction algorithms –

urgently needed – no one doing this!

Assembly of 20 SCs VPT databaseBare SC assemblyPre-production HV cardsPre-production umbilicalsTrigger mapping and checking

HV system Final HV system + fanout HV boxAll software drivers completed

VPT stability LEDs At least one system required

EE test beam/analysis Opportunities for the UK to take leading roles………

Additional info

Noise across Dee

Transverse noise across Dee, VPTs sorted

ET from 30 – 60 MeV (old normalisation)