Test beam 2004 - crystal tests using E0’

Possibility of new crystal producers for both Barrel and Endcap

Need to appraise crystals from these producersOf particular concern: crystal response to irradiationBCTP and SIC have recently produced EE crystalsSIC crystals show a 25-30% additional light yield compared to BCTPApatity (North crystals) to produce a few crystals, by end April

Proposal:Use test beam from May 27th to appraise crystalsConstruct 1 SC array with Russian and Chinese crystals, mounted on E0’Crystals to be pre-irradiated and sorted for the SCRead out with 25 channels of MGPA electronics (SM1) from 2003 Irradiate crystals at H4Follow LY and monitoring response in detail

Objectives: To establish whether the crystals meet the CMS ECAL technical requirementsClearance to place contracts for crystals by summer 2004

Basic EE Hardware Needs for Crystal Beam Tests - May 2004

Working assumptions (06-Apr-04):

• 1 EE supercrystal containing 15 SIC, 8 BCTP & 2 Apatity crystals

• The supercrystal will be built at CERN

• We will use (up to) 25 channels of 2003 ECAL Electronics chain

• Beam starts May 27th

• Goal is to have the bare supercrystal ready for HV boards by Apr 26th

• All hardware for one bare supercrystal must be at CERN by the Friday after Easter, 16 April

Preparation

Responsibles:

EA - Etienette Auffray, CERN KWB - Ken Bell, RAL DJAC - Dave Cockerill, RAL DB – David Bailleux, Minn MD - Marc Dejardin, Saclay MH – Maurice Haguenauer, LLR RB – Robert Benetta, CERN PSF - Paul Flower - RAL HFH - Helen Heath - Bristol PL - Pierre Lecomte - ETHZ ABL - Tony Lodge, RAL JR - John Rander, Saclay BJS - Brian Smith, RAL TA1 - CERN-PH TA1 group VP – Vladimir Postoev, INR VG – Viatcheslav Grishin (Slava), IHEP IA – Alexander Inyakin, IHEP

E0’

• E0’ moved to bldg 11 on 30 March to be connected to full ECAL R/O chain

• E0’ currently equipped with one prototype SC – to be replaced

• Work ongoing by MD, RB, AL• Umbilical connected to Motherboard (with the ‘any 5’ trigger ordering)• 25 channels MGPA VFE + FE card (SM1, 2003) = one barrel tower• Blue LED pulses to front of crystals, one at a time • Signals seen in correct order by full readout chain• noise ~ 2 ADC channels, work in progress

Possibility to inject light into each crystal separately from front

Supercrystal assembly

Hardware (needs+spares):

SC crystals

25+5 EE crystals - EA

SC mechanics + VPTs

1+1 Alveoles - 3 already at CERN - BJS/TA1

25+5 Tyveced Front Inserts - 75 already at CERN - BJS/TA1

1+1 sets of Rear Inserts - 3 sets already at CERN - BJS/TA1

1+1 Interface Plates - 3 already at CERN - BJS/TA1

1+1 Housings - 3 already at CERN - BJS/TA1

25+5 VPTs - ~48 already at CERN - DJAC

1+1 calibrated thermistors & cables (what connectors?) - PSF

Supercrystal assembly + umbilical

SC mechanics + VPTs (contd)

Glue for Rear Inserts - already at CERN - BJS/DJAC

Glue dispensors for Rear Inserts - already at CERN - BJS/DJAC RTV Glue for VPTs - on order in the UK - BJS Glue dispensors for VPTs - ??? - BJS/DJAC

2 Glueing Jigs for VPTs to crystals - already at CERN - DJAC

10 Centering tubes/weights for glueing - already at CERN - BJS/DJAC Bar-code reader for crystal serial numbers (or temporary labels???) - DJAC

Jig for manipulating alveolar during construction – ETH-Z/PL

Supercrystal lifting "handle" - already at CERN - DJAC

SC umbilical 5+2 HV boards - presently at RAL - ABL 1+1 umbilical signal looms - ABL 1+1 umbilical HV (SHV) cable pairs - ABL

Test gear for supercrystal soak test at CERN - ABL/HFH/DJAC/KWB/VP/VG/AI

E0’

Monitoring 50 Porte-Ferrules - already at CERN - BJS/DJAC Tooling for Porte-Ferrules - already at CERN - BJS/DJAC 1 Level-1 EE fibre optic harnesses - 1 presently on E0’ at CERN - BJS/JR Laser(s)/photo-diodes/MEMs/mating-pieces-to-photo-diodes etc etc - JR???

E0’ mechanics 1+1 positional spacers - already at CERN - DJAC E0prime support backplate & related ironmongery & cooling plates - already at

CERN - DJAC Mounting bolts & shoulder bolts - already at CERN - DJAC E0prime thermal enclosure, already at CERN, extra insulation – TA1 Support to mount E0prime system onto test beam turntable - TA1 design/ fabricate

Readout HV system for beam tests - KWB EE Mothercard/connectors/pigtail - ABL

Full readout chain, LV system, MEM, etc - MD 1 set of EE cooling bars & related mechanics etc - already at CERN - JAH

Test beam meetings/H4

Wed 14 April

Test Beam Mtg, Yves Sirois

- follow on from PRS, at ~ 16.00

- choice of crystals

- irradiation procedure

» Use of 6 days of beam for 25 crystals

» Start up requirements (DAQ setup, laser setup)

» Beam size, rate, calibration points

» Shift list + test beam web page for 2004

• Laser system at H4 – expected to be ready by Mon April 19

• Optical cables from CR to area – currently those from 2003

• Cooling system + interlocks – to be discussed

• 10 SHV cables to be laid from CR to area

Test beam

SPS MD 10.00 Wed 26 May – 10.00 Thu 27 May

Beam 10.00 Thu 27 May – 10.00 Wed 2 June (~ 6 days)

25nsec beam 08.00 Mon 7 June – 08.00 Mon 14 June

Shutdown 08.00 Mon 14 June – 08.00 Sat 19 June

Beam 08.00 Sat 19 June – 08.00 Wed 30 June (~10 days)

E0’ – corresponding SCs in CMS

6,45,4

5,5 6,5

Spacer numbering

Column, Row

Angles at CMS

737.67mm

587.31mm

o

3179 mmIP to front of EE

= 38.526 o

IP

Angles for E0’, Y-Z plane

Y

Z

= 10.47o

587.31mm

3179 mmIP to front of EE

Beam

Angles for E0’, X-Z plane

X

Z

= 13.06o

737.67mm

3179 mmIP to front of EE

Beam

E0prime backplate & SCs

352mm

250mm

Position of middle of array, 390mm forwards from backplate, with respect to backplate edges