SQUID Inventory List Rm B112 ------------------------------- Original Rev. 13-Sept-2020 Current Rev. 26-Aug-2021 In looking around Rm B112 I found the following Quantum Design SQUID equipment. Model 2010 Quantum Design Name "Analog Control Unit": -------------------------------------------------------- ACU 04-146 Currently in use by Swapna. Had dead batteries that were removed. Has type 3001-004 Rev B power supply board. Has type 3013-002C main board. Has type 3001-006A display board. 19-Sept-2020 Install new Batteries 3-Oct-2020 Install new Ten-Turn Dials ACU 04-141 Masking tape label = "Old but Works" I believe Swapna said it does not work well. Had no batteries installed in it. Has type 3001-004 Rev B power supply board. 19-Sept-2020 Install new Batteries 12-Oct-2020 Install usable Ten-Turn Dials 4-Aug-2021 Modify top of case to have strong mechanical and electrical mouting of SQUID Amp. Mount SQUID Amp 03-552 to this ACU and connect with short well shielded 1 ft long cable. Remove the Chassis Gnd connection from the 3rd wire of the line power input connector. I have been charging this ACU's batteries for a day once every few months. ACU 04-125 Masking tape label = "Counter Weight" Had very old dead batteries that were removed. Both front panel 10-turn trim pots are broken. Has type 3001-004 Rev B power supply board code 9314 Has type 3013-002D main board newest date code 9318 Has type 3001-006A display board newest d code 9818 Model 2000 Quantum Design Name "SQUID Amplifier": ---------------------------------------------------- AMP 03-926 Masking tape label = "New" This is the one that Swapna is using. FB Switch set for Internal Feedback. AMP 03-712 Found under a pile of stuff by a microscope. FB Switch set for Internal Feedback. 5-Aug-2021 Look inside and see: Switch set to Int FB, W2 is installed --> C7 directly grounded. FB Brd is Rev A 3012-001 latest code 9530. Dig Brd is Rev A 3012-002 latest code 9524. C24 is 100 nFd. The wipper of the Gain Pot has space wired a 499 Ohm and then cap to Gnd probably a 47 pFd cap. Close up. AMP 03-552 Masking tape label = "Old but Works" FB Switch set for Internal Feedback. Newest date code = 9308. R35 is 27 Ohm but is jumpered to Gnd. C7 is 330 nFd 50V mylar C24 is 100 nFd 100V C5 is labeled "101" 4-Aug-2021 Remove jumper W1 to turn off the unused 10 mA range and thus reduce the power draw. Verified jumper W2 in place --> the cold end of C7 is grounded. Add kapton tape inside 4 corners of long box to prevent any component from touching the case. Disconnect the FB Triax connector from the FB selector switch and Gnd. Connect center and middle of the FB Triax connector to a common mode choke (bifilar 15 turns on 2 smallest size Vicor cores which should give about 1.7 mH). At other end of choke tie Middle Triax wire to Signal Gnd and tie Center Triax wire via a 100 Ohm resistor to Integrator Output, i.e. U4-6. Both boards in this Amp are Rev A Digital 3012-002 Analog 3012-001. Mechanical and electrical mount to ACU 04-141 & connect with 1 ft cable. This SQUID Amp remains Internal FB and can now provide FB directly to the Quick Dipper's FB/Ref port. AMP 03-399AC Masking tape label = "Outside Old" It is missing its control cover. FB Switch set for External Feedback. 5-Aug-2021 Look inside and see: Switch set to Ext FB, W2 is removed --> C7 grounds through 27 Ohm R35. FB Brd is Rev A 3012-001 latest code 9118. Dig Brd is 3000-028 Rev A latest code 8929. C24 is 100 nFd 100V. Close up. AMP 03-189 Found on a shelf on the North wall of B112. Has a label on it = "Transverse". FB Switch set for External Feedback. Newest date code = 8827. R35 is 27 Ohm and is in the circuit. C7 is 330 nFd 50V C24 is 100 nFd 100V C5 is labeled "101" Cables Analog Control Unit - to - SQUID Amplifier: ---------------------------------------------------- I found 3 of these cables. Two of them have loose strain relief clamps that will eventually result in broken wires in these cables. A cable of the appropriate length for the distance between the ACU and Amp in the current setup would be better. 31-July-2021 Make a 1 ft long Amp to ACU cable that is well shielded. Used the cable clamps from an existing long cable that folks thought may be bad. Connectors are: Newark Part Num: 25K6575 Description: Circular Connector, MIL-DTL-38999 Series II, Straight Plug, 13 Contacts, Crimp Pin, Bayonet, 10-35 Amphenol Part Num: MS27473E10F35P Cables SQUID Amp - to - Probe Trompetter Triax: -------------------------------------------------- I found 7 of these that I think are all the short real triax cable that is designed for this equipment. Actual SQUIDS Sensor: --------------------- I don't know how many actual RF SQUIDS are around and available for use. I believe that Quantum Design made this electronics for use with a sensor called the "BTI Hybrid SQUID sensor". I believe that SHE became BTI which became Tristan Tech. Swapna showed me that there is a third RF SQUID in the very North-East corner of Rm B-112. It is propped on top of the wire-mold outlet tray. It consists of just the Trompeter connector, thin cryogenic coax, SQUID mount, SQUID, and shield. Inside the SQUID itself is not connected to the coax. I took pictures of it for reference and put them on the web. We assume that this is a 200 MHz SQUID and not one of the old 19 MHz units. Operating Manual for this SQUID Controller Electronics: ------------------------------------------------------- I found a manual for this SQUID electronics under a pile of stuff in the screen room. There appear to be about 8 other equipment manuals laying about in the screen room. This Quantum Design manual is from September 1992 and covers both the Model 2000 VHF SQUID Amplifier and the Model 2010 SQUID Controller (referred to as the Analog Control Unit in the body of the manual). On one hand this manual is very detailed and gives us a ton of important information including things like the gain and phase margins of the feedback loop. On the other hand it completely leaves out important things like when and how is the battery power supply operation in effect. Do we even need to plug it into a wall outlet to operate it from the internal battery ? I made a copy of this manual before returning it to Rm B112. Put this manual on the web at: https://web.pa.msu.edu/people/edmunds/SQUID_Controller/ Quantum_Design_2000_2010_Manual/ Other SQUID stuff in Rm B112: ----------------------------- On a shelf in the North-West corner of Rm 112 under a pile of stuff there are 3 old SHE 30 (or is it 330) SQUID controllers. I did not see any of the RF Heads for this system or the cables to connect them or the manual. There may be a manual for this old SQUID system in the Physics Electronics Shop. Later found 2 RF heads for this series of SQUID electronics in B112 drawers along the hallway wall.