1. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze ALICE-Budapest meeting, 20120330 p.1 Contents I.Politicsp. 2 II.Integrationp. 3-10 III.UV-LED testsp. 11-15 IV.Plans for 2012 Purchase Pressurized items Beamtest TGEMp. 16-22

2. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Meeting of the ALICE-US groups p.2 R. Bellwied On the general US strategy:

3. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Meeting with spokesperson and deputy p.3 R. Bellwied Reminder: ALICE-decision on the VHMPID is expected in September

4. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze p.4 Integration meeting on 14 March 2012 with: ALICE technical coordination DCAL PHOS VHMPID

5. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze LS1 DCal configuration p.5 In the LS1 configuration, the nominal radial distance of DCal from the space frame is 24cm. However, considering the TOF crates supporting elements, the max. distance is 10cm. 10cm TOF crates supporting elements 24cm from A. Tauro Space frame DCAL

6. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze DCAL-proposal for LS2 p.6 DCal modules lowered by 78cm. No modifications of A-side cradle. C-side cradle taken out and replaced with A-side like one.

7. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze DCAL-proposal for LS2 p.7 Available vertical space: 72cm. Considering 5cm min. clearance, the max. vertical space is 67cm in front of the DCAL 67cm DCAL PHOS 5cm

8. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze PHOS vs VHMPID p.8 If the PHOS is lowered after insertion till touching the DCal rails then 60cm available for VHMPID (considering 5cm clearance). 40cm 25cm PHOS DCAL VHMPID

9. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze What is next in this issue p.9 67 cm (60 at PHOS) in not enough. There is room for increasing it: - more effort on the DCAL side - modification of PHOS - better understanding of the TOF-region To be continued……

10. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Calcutta chamber, Central module p.10 Eta-view Phi-view Phi-direction Eta-direction

11. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze UV-LED lab-tests (Feb 2012) p.11 Data taken in all the variations: 1A, 2A, 1B, 2B The setup: Pad-plane: A) Pad-plane without CsI B) Pad-plane with CsI Illumination: 1) Focusing arrangement 2) Non-focusing arrangement (no pinhole, no lens) Pulsed UV-LED 245 nm Pinhole 300 mkm spot on the pad Quartz window Pad-plane Anode wires Variable gap chamber To study the single electron response of the small (8x4 mm 2 ) pads by a direct method The aim: To study the cluster size and charge distribution Feed-back photons for single photo-electrons Better understand beam-test data With this:

12. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze UV-LED test: photos p.12 LED pinhole lens Results: On the analysis-meeting(s) The setup: pads Illuminated points Position scan: The monitor image of this point:

13. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze p.13 2012 plans, tasks

14. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Beamtest schedule and program p.14 31 May- 11June (June 6: MD) 25 June- 9 July (June 25-28: long MD) 22 Oct- 5 Nov (Oct 22-26: long MD) 3-18,18-25 Sept (Sept 19: MD) Our plan: 31cMay-11 June:pressurized vessel, variable gap chamber installation, commissioning, technical test of the setup 25 June-9 July:pressurized vessel, variable gap chamber beam-test, physics runs Sept:GEM with liquid radiator, whatever needed (MIP? Frontend?) Oct-Nov: Pressurized vessel, Kolkata chamber beam-test, physics runs J u n eJ u l yA u gS e p tO c tN o v VHMPID beamtest periods (all at PS/T10): Reminder: no beam at CERN in 2013

15. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Test-setup for May-June-July p.15 I. Sgura, C. Pastore

16. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Heating simulation p.16

17. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze FE-calculations of the vessel+window p.17 Gábor Endrőczi

18. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze FE-calculations of the vessel+window p.18 Gábor Endrőczi

19. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Budapest-related: what happened in 2011 p.19 The MIP-detection is not on the critical path: There is a candidate based on CCC-chambers 500x1000 m2 size demonstrated L0-operation demonstrated Possible further work will be discussed In Budapest during the coming weeks. A 6-layer 64x64 mm 2 BPD* was tested in November with GASSIPLEX readout. This device would be useful as standard equipment at T10. * BPD: CCC-type Beam Position Detector TCPD BPD * TCPD: Alternative photon-detector with a GEM and a CCC-type layer (TGEM+CCC Photon Detector) A 200x200 mm 2 TCPD* was tested in November with GASSIPLEX readout. Similar to the GEM/TGEM option (see slide 18)

20. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze What could/should happen in 2012 p.20 MIP/Trigger layers: not on the critical path but: - 5cm thick detector (in total) - Read-out/DAQ/Trigger Beam position detector: Two boxes of 2x2D 64x64 mm^2 detectors for T10 with Gassiplex readout for end of May (Gyula Bencédi) GEM/TGEM related: See next slide

21. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze Mirror, window p.21 Composite mirror substrate: from CMA (Tucson, USA) Ordered by Chicago $2350 Sapphire window: big (diam 165mm) AR-coated piece for the beam-test and small samples from CMScientific (UK). Producer: Crystal Systems, Salem, MA, US) Order launched (DAI 4879624), signed by Mexico ~8320 CHF Both have been ordered:

22. ALICE-VHMPID collaboration meeting, CERN, 20120323. Technical matters. G. Bencze TGEM photon detector p.22 A discussion (in two parts: 23 and 24 February) with Guy, Francois, Levente, Michael, Gergo The work now is concentrated on the three new 100x100 TGEMs (presently under study in Budapestand the front-end. The September beamtest program will be defined depending on the results. Dedicated talk at the next Collab. Meeting? Very brief summary: