FVTX LV, HV power

There are electronics in (possibly) 3 locations:
  1. FEE, located on the silicon
  2. ROC, 'near' the silicon, possibly on the disk collars
  3. FEM on the endplates


In addition, HV (<~200 V) needs to be supplied to bias the Silicon

(from this ppt)




1. FEE power, per arm
  z-position max radius area radial chips total # power voltage current
disk 1 +-18.7 cm 10.0 cm 276 cm2 5 240 9.8 W 1.8 V 5.4 A
disk 2 +-25.1 cm 18.0 cm 980 cm2 11 528 21.6 W 1.8 V 12.0 A
disk 3 +-31.5 cm 18.0 cm 980 cm2 11 528 21.6 W 1.8 V 12.0 A
disk 4 +-37.9 cm 18.0 cm 980 cm2 11 528 21.6 W 1.8 V 12.0 A
totals per arm:     3216 cm2   1824 75 W    
Totals for the FEE: ~3700 chips but only 75 watts per endcap.

2. ROC / Collar electronics (to be expanded)

3. FEM / Endplate electronics (to be expanded)
Segmentation
Segmentation should allow some medium-grained control over power supply channels. If our smallest unit is a segment as shown here (1/24th of one endcap) the number of independent channels is 24 per endcap, 48 total. A loss of one channel leads to the loss of 1/48 of the total acceptance.

[ Alternatively, we could group by quarter-disk (32 LV channels total), but then if a channel is lost, tracks in 1/8th of the total acceptance lose one point, leaving too few points for a good-quality track, a worse loss. ]

Each segment would receive a group of voltages (1.8V, 5V... plus bias V)



Some supply options:
I - CAEN
CAEN company HV pages
  • up to 6-channel modules
  • comes with control software
  • low ripple (<5mv pp)
  • we already have some at Phenix
  • expensive
  • expensive maintainance, repair
  • can provide HV also
           


II - PHENIX STANDARD
This shows a Phenix standard LV crate. On the rhs of the crate is a double-wide unit that converts 3-phase 208 AC to 300V DC, which is put on the crate's backplane.

Two single-width modules are shown, one providing 6 channels of LV, the other 8 channels.

The heart of the modules are VICOR DC-to-DC converters. Modules are available to produce 1-95 V.

  • 6 or 8-channel modules, up to 12 slots per crate
  • comes with Phenix control software
  • ripple likely not as good as CAEN
  • have many at Phenix already
  • not so expensive
  • inexpensive maintainance, repair
  • BUT: need to provide separate HV (used LeCroy in the past)
In the back of the supply crate are slots for optional custom noise filtering boards
Control via Adam / ethernet modules
More Phenix links:


III - Japanese product (get info from Atsushi Taketani)  

progress: refine power estimates determine noise specs determine lv segmentation cost Identify HV source