NA62 CEDARPMT Cooling Update

Tim

Chiller Investigations• Web search identified Huber as one possible

supplier– Europe-wide – Popular at CERN

• UK sales outlet is Radleys– Mainly specialise in chemistry-related equipment– Main Huber product lines are re-circulating baths

and low temperature re-circulators• Identified Unichiller UC017-H as a possible

solution for NA62• Visit by David Martin last week to discuss

Parameters

Parameter Value

Temperature -10 to +100C

Cooling power 1700W

Heater Power 2000W

Flow @ 0 pressure 27 lpm

Max pressure 3.0bar

Stability 0.1C

Sensor Internal or external PT100

Mass 120Kg

Dimensions (WxDxH) 450x510x1231

Cost £6,300 (each !)

Control• Options include de-mountable control panel allowing

remote operation– Remote means

• Distance ~ 20m (not 200m)• Interface is digital so there’s still intelligence in the chiller

– Doesn’t get ‘round SEU issue

• Optional digital interface (ComG@te)– By-passes control panel– Interfaces via ethernet to PC– Control / diagnostic s/w available allowing control /

monitoring at ‘user’ and lower level– MAY get ‘round SEU issue by

• Regular read out of control parameters & check against defaults

• Ability to re-write parameters whilst chiller’s running to ensure correct values

– Big issue is whether the full memory’s all available and whether the software can be adapted to automatically check for errors

Control …• 0-10V analogue output available for

monitoring (via ELMB)– Raise alarm if temperature deviates too much?

• Beginning to ask ‘awkward’ questions which require ‘expert’ knowledge of Huber systems to confirm whether there’s a viable solution

Pumping Curve• Recall Spec is – dP = 1.8b, flow = 6lpm– Power = 2 x 107W

• Pumping curve shows a maximum volume flow of 10lpm for dP=1.8b– Impact will be slightly

larger inlet-to-outlet temperature rise

Summary• Huber seemed like a good bet but….– One UC017-H will just about cool the PMT arrays

with an inlet to outlet rise of 0.25C but with little safety margin

– The remote control panel does not solve the SEU issue

– The cost is rather high (if we need two)– The issue of control/monitoring via ethernet would

need further discussions with Huber experts to confirm if it is possible to diagnose SEU issues & re-write parameters/re-start chiller remotely.

• Will also start looking for an alternative…… !