HCAL RBX PRR H C A L Readout

HCAL RBX PRR H C A L Readout Box (RBX) PRR Dan Green HCAL Project Manager RBX PRR - March 1 -2, 2001 1

Outline H C A L • Schedule and Milestones • R&D experience • RBX components • • shell backplanes ODU HPD Calib - laser, LED, sources Services - HV, LV, cooling, Controls RBX PRR - March 1 -2, 2001 2

HCAL Organization RBX PRR - March 1 -2, 2001 H C A L 3

HCAL - ML, HB RBX PRR - March 1 -2, 2001 H C A L 4

H HCAL Critical Path and RBX C A L RBX PRR - March 1 -2, 2001 5

H Central HCAL RBX HB 16 C A L RBX 15 HE RBX PRR - March 1 -2, 2001 6

HB RBX Detail View H C A L The issue for the RBX is the access to the HPD. There are integration issues with the tracker patch panel. A mockup was made and changes appear possible which will ease the problem. Schedule is such that the RBX is near to the critical path. RBX PRR - March 1 -2, 2001 7

H HE RBX Conceptual Design C A L HE can go ahead with the RBX, it appears, as the overlap of services and cables with other subsystems is not as severe as it is with HB. RBX PRR - March 1 -2, 2001 8

H ODU - Optics for Layer-->Tower C A L RBX PRR - March 1 -2, 2001 9

HPD H C A L The HPD have had many problems which have been solved - sequentially. At present we specify an Al electrode and an antireflection coating. This “works” but the problem of low yields at the vendor must be solved. 19 x 5. 5 mm RBX PRR - March 1 -2, 2001 73 x 2. 75 mm 10

H 1 and H 2 Layers RBX PRR - March 1 -2, 2001 H C A L 11

Pulse Formation - Bias H C A L We have developed at fast diode which - with guard rings - can be run at very high bias. RBX PRR - March 1 -2, 2001 12

Near Term HPD R&D RBX PRR - March 1 -2, 2001 H C A L 13

H HCAL QIE-based Front End C A L RBX PRR - March 1 -2, 2001 14

QIE Schedule RBX PRR - March 1 -2, 2001 H C A L 15

H Decoder Box, Test Beam R&D C A L RBX PRR - March 1 -2, 2001 16

Access to FE Electronics H C A L 53 degree end of HB wedge. Blue = HCAL services Green = ECAL Red = Tracker End of HB wedges obscured by cables and services from HB, EB, tracker. Servicing electronics nontrivial. RBX PRR - March 1 -2, 2001 17

Goals H C A L • We have a ~ final design which has been on hold for 6 months. • The schedule for RBX is near to the critical path. • The design has been sent to CMS for evaluation and optimization. • We need approval of the RBX - optical cables, ODU, shell, etc. The HPD and QIE are not yet ready for prime time. RBX PRR - March 1 -2, 2001 18