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1 Experiment Readiness

Review of Physics Division October 12, 2016

Experiment Readiness Review of Physics Division

Hall C SHMS Q2, Q3, and Dipole: Review of Common Components

Steven Lassiter

October 12, 2016



Common Component List

• Cryo Control Reservoir (CCR)

(Myer Tooling)

• Current Leads (AMI)

• DC Power Supply (Danfysik)

• Quench Detector (Danfysik)

• DC water cooled bus

• Cryo Lines, Valves and Actuators

• Instrumentation

• Relief Valves & Rupture Disks

• PLC Control

• Additional Equipment



Comments on Common Systems

• SHMS SC magnet designs utilized standardized & tested systems & components.

• Use of Standardized Tested Systems results in safer magnets.

• Standardized magnet system components lead to sensible higher quality magnet solutions that are easier to operate and maintain.

• Standardized components (procured in bulk by JLAB) saved money & time.



Cryogenic Control Reservoir

• Manufactured by Myer Tooling in 2010 in accordance with the intent of the ASME 2007 section VIII Division 2.

• Six were made - one went Hall D

• Contains a 91L He and 54L LN2 reservoirs.

• Piping and valves to direct cryogen flow.

• Chimney area where the Vapor Cooled Current leads are spliced to coils superconducting leads.

• Platform for valve actuators, relief devices, cryogen bayonets, vacuum/pressure gauges, instrumentation ports and current lead interface.

• Original used on the HMS magnets.



Cryogenic Control Reservoir



AMI Vapor Cooled Current Leads

• AMI/JLAB 5000 AMP

burnout proof re-

optimized vapor cooled

current lead (1.63

L/Hr/KA)

• 5 KA lead pair designed,

built and tested by AMI

• 5000 A DC No Cooling

for 11.3 minutes Safe

• 3700 A DC No Cooling

Safe forever

• 33 minute (2.5

A/sec)slow dump no

cooling Safe



VCL 5KA no coolant 11mins @ 4900A Test

Figure 7

Tempertaure Profile - 5000 Amp Current Lead

0

50

100

150

200

250

300

350

0 5 10 15 20 25 30

Sensor Location on Lead (inches, cold end to warm end)

Tem

pera

ture

(K

)

Full Flow, 4900 Amps

No FLow, 4900 Amps, 100 Seconds

No Flow, 4900 Amps, 200 Seconds



No FLow, 4900 Amps, 500 Seconds


No Flow, 4900 Amps, 680 seconds



DC Power Supply

• Danfysik System 8000 - JLAB Features

• Standard DC PSU for HMS, Hall D, CLAS Torus & HRS Q1’s, Hall B Torus and Solenoid

• Integral NMR stabilization, polarity switch, energy dump & Quench Detection

• JLAB standard control panel remotely located within SHMS Electronics Room.

• Compatible with standard Hall C magnet controls and ASCII communication.



DC Power Supply

• Stability at 1E-6 level in

regulation mode.

• Stability is ~ 10 nano

Tesla with NMR, Used on

Dipole Magnet.

• Absolute Precision better

than 1E-4 .

• Transistor final stage

regulation.

• PARD better than 1E-5.

• Fast Energy Dump Switch



Danfysik system 8500 PSU

Dump Switch circuit



DCPS Testing

• Factory test of PSU into a resistive load was witnessed by JLAB staff.

• PSU’s acceptance test within Hall C using the HMS magnets as the

inductive load - June 2014.

• Issue with the regulation boards allowing an in rush of current when the

PSU main (to the magnet) is turned on.

• Repaired regulation boards have been installed and re-tested.

• Improvements to the Dump bypass switch opening times have been made

and tested. Dump bypass switch opening times went from ~1 sec to ~30ms.

• V-loop boards have been adjusted to reduce ringing. Final balancing will

occur once connected to magnets inductive load.



DCPS Interface



DC PS Interlocks

Slow Discharge

• HMI-PLC Buttons

• Hardware/PSU Slow

Discharge Buttons

• Current Lead Mass Flow

• Status of Dump Switch

• Helium Liquid Level < Min

• Magnet Temps > 10K

• Vacuum > 0.01 Torr

• 1.0< LN2 Pressure > 2.5

atm

• Min< Support Links> Max

• Fast Interlock Signal

Fast Discharge

• Quench Detector Hardware

• QD Software

• HMI/PLC Panic Button

• Panic Button Hardware

• MPS-CPU reset command

• PLC keep alive timer > 10 sec

• 1.0 < He Pressure > 1.8 atm

• Broken cable/wire detection

Voltage Taps



Hardware Quench Detector

• Range and sensitivity easily customizable

• Detection range ~ 5 milliVolts to 1 volt. Nominally set to 10mV for magnets.

• Integrated into Danfysik System 8000 DC power supply.

• Detection mode: Bucked signals for coils, absolute voltage for current leads.

• Broken cable detection.

• Extra relay and interlocks status outputs for PLC.

• Setup and calibration will occur during low power magnet commissioning.

• Response time measured at ~15ms with no front panel delay time.

• Backed with a PLC software Quench Detector.



Quench Detector Schematic



DC Water Cooled Bus

• Water Cooled DC bus lines.

• 2,000 MCM

• 5 gal/min coolant

• Resistance 0.24 milli-

Ohm/lead

• Water flow switch in series

with PSU’s water flow

interlock



Cryo, Vacuum, Pressure, Strain Gauges

• JLAB/FNAL valves, actuators, bayonets

• Macro Sensors LVDT valve position readback units.

• Cryomagnetics Liquid level meter for both LHe and LN2.

• PT100 sensors for temperatures above 50K

• Carbon Ceramic sensors (Temati) for temperature <50K and located in high magnetic and radiation fields.

• Diodes for temperatures sensors in low magnetic fields.

• Single multi-range vacuum gauge.

• He and LN2 pressure gauges.

• Strain gauges for support links.

• Cryofab He mass flow controllers for Vapor Cooled Current Leads.

• Hall probes and NMR unit for Dipole.



Relief Valves

Relief Valves • Set pressure: 4 atm (gauge)

• Helium relief valve Anderson Greenwood pilot operated relief valve, Model No. 25905K34/S with a discharge area of 1186 mm^2

• Nitrogen relief valve Flowsafe F84-8 ¾ X 1F SS 0.261 in^2

Relief Valve

Magnet Failure Mode Required Capacity (kg/hr)

Design Capacity (kg/hr)

Helium Q2/3 Quench with active protection

𝟓. 𝟏𝟕𝟓 × 𝟏𝟎𝟑 𝟏𝟔. 𝟖𝟏 × 𝟏𝟎𝟑

Dipole Quench with active protection

𝟖. 𝟔𝟒𝟔 × 𝟏𝟎𝟑 𝟏𝟔. 𝟖𝟏 × 𝟏𝟎𝟑

Nitrogen Q2/3 Loss of vacuum 𝟎. 𝟓𝟓𝟗𝟏 × 𝟏𝟎𝟑 𝟏. 𝟏𝟓𝟕 × 𝟏𝟎𝟑

Dipole Loss of vacuum 𝟏. 𝟎𝟏𝟎 × 𝟏𝟎𝟑 𝟏. 𝟏𝟓𝟕 × 𝟏𝟎𝟑



Rupture Discs

Rupture Discs • Set pressure: 5 atm (gauge)

• Rupture disc for helium Fike 3’’ AXIUS for Q2/3 and Fike 4’’ AXIUS for Dipole

• Rupture discs for nitrogen Fike 1’’ AXIUS BT

Rupture disc

Magnet Worst Scenario Required Capacity (kg/hr)


Helium Q2/3 Loss of vacuum triggers quench with failed dump resistor

𝟑𝟎. 𝟐𝟎 × 𝟏𝟎𝟑 𝟑𝟔. 𝟎𝟏 × 𝟏𝟎𝟑

Dipole Loss of vacuum triggers quench with failed dump resistor

𝟒𝟕. 𝟔𝟑 × 𝟏𝟎𝟑 𝟔𝟎. 𝟓𝟎 × 𝟏𝟎𝟑

Nitrogen Q2/3 Loss of vacuum 𝟎. 𝟓𝟓𝟗𝟏 × 𝟏𝟎𝟑 𝟐. 𝟔𝟏𝟔 × 𝟏𝟎𝟑

Dipole Loss of vacuum 1.010 × 𝟏𝟎𝟑 𝟐. 𝟔𝟏𝟔 × 𝟏𝟎𝟑



OVC Parallel Relief Plates

Parallel Relief Plates (pop-up relief valves) for Vacuum Insulating Space of Magnet • Relief pressure: 0.5 atm (gauge)

• Two 4’’ parallel plates

Worst Scenario Required Capacity (kg/hr)


A broken helium line 𝟖. 𝟎𝟕𝟏 × 𝟏𝟎𝟑 𝟏𝟕. 𝟕𝟑 × 𝟏𝟎𝟑

A broken nitrogen line 𝟏. 𝟕𝟐𝟗 × 𝟏𝟎𝟑 𝟐𝟓. 𝟑𝟎 × 𝟏𝟎𝟑



PLC Control Layout

• Copy of the HMS controls -

Programmed in-house.

• Allen Bradley Dual Redundant PLC & hardware.

• Rockwell Automation software.

• Radiation hard signal conditioning within Hall.

• PLC and I/O modules in a clean, accessible environment.

• Hot swap of components.

• Shares data with EPICS and OPC devices. (Open Connectivity



PLC Rack Hardware

• Each subsystem has ~100 signals.

• Cables to port signals from each magnet’s CCR to Detector Hut Electronics room installed.

• Signal Conditioners for:

1. Temperature sensors: PT, carbon glass

2. Strain gauges.

3. LVDT, valves position read back.

4. Cryogenic Pressure sensors, flow meters and liquid level meters.

5. Voltages and currents.

• Housed within five I/O racks located in Detector Hut Electronics room.

• Communications: ASCII, Ethernet and Control Net.

• Field control devices (NMR, Hall Probes).

• Power supplies (low voltage 24V and 5V).



Magnet Interlock Page



Additional Equipment

• Tektronix DPO3000 series 4 channel data storage scope

• Timing of 10K sample/sec

• Coincident timing among 4 channels

Capture of Scope’s screen for SHMS HB’s 1700A Fast Dump

• Extra Current Transducer LEM2 if needed



Conclusion

• SHMS Magnets share many common components, resulting in savings in

cost, setup, commissioning and repairs.

• All systems are in place, tested and prepped for installation.

• Lessons learned and performance enhancements from HMS, SHMS Q1 &

HB magnet commissioning and other halls have been incorporated to all

systems.

• Ready for magnet arrivals.



Appendix



SHMS Valve Control Screen



Force Link Screen



Voltage Screen

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