Status of HFT

1
Status of HFT

• Wieman
• RNC
• LBNL
• HFT workshop
• LBNL
• Fri 14 October 2005

2
Status Report
Meet the 2008 Au Au challenge and the 2014 high
luminosity challenge

• IReS Pixel Chips
• Ladder readout
• DAQ developments
• Ladder mechanical development
• Reduced mechanical scope
• Beam pipe
• Future fast pixels

3
IReS MIMOSTAR chips

• MIMOSTAR1 (0.25 ?m TSMC)
• Reduced size prototype but sophisticated chip
  with complete functions for operation in a real
  detector system
• Everything operating except pixel signal because
  of 0.25 ?m TSMC feature Unexpected short signal
  decay time compared to theory and AMS experience.
  
• MIMOSTAR2(0.35 ?m AMS optical process)
• Just back from the foundry
• First word from IReS, it works perfectly.

4
Readout system

• Emphasis on early delivery, i.e. off ladder ADC
  approach
• Not enough time to develop piggy back readout
  chip for 2008 running
• Excellent recent progress in solving the
  technical problem of fast cable readout
• A product of close communication with IReS a
  SPICE model dialogue
• An outgrowth of the prototype ladder using
  MIMOSA5 chips, the work of
• Bieser, Greiner, Gareus and Kushpil

5
Spice model for ladder cable
Manufactures provide models of their products
100 MHz analogue OK
6
SPICE dialogue
7
Readout/DAQ
Based on SIU/RORC connection Tonko Ljubicic
solution for both TOF and new TPC electronics
HFT data to fit into STAR data stream like any
other detector A reduction in scope from
previous plans to achieve early implementation
with current man power.
8
Mechanical Ladder Development

• Refining construction and bonding of light weight
  structures
• Testing for stability and flatness

100 ?m
9
STAR Micro Vertex Detector
Full self consistent spatial mapping prior to
installation Installation and removal does not
disturb mapping
10
Conceptual mechanical design
11
Full ? 2? concept
In the interest of early deployment, simplify
interconnecting mechanics by reducing to one
module with ? 2? /3 What is the physics price?
12
Beam pipe

• Meetings and discussions with
• Wolfram Fisher
• Dick Hseuh
• Robert Pak
• Dan Weiss
• Our beam radius OK for accelerator, but we are a
  limiting aperture
• Accelerator can live with 10-5 (we expect 10-9,
  but what can we live with?)
• PHENIX has adopted our 1.5 cm radius, 0.5mm wall.
• Preferred bake out 200-250 ?C to activate NEG
  coating

13
Next generation fast APS detector - good for 2014
Candidate Technology MIMOSA8

• Submitted requirements list to IReS. They will
  provide estimates for building