[Dsg-hallb_magnets] Estimated temperatures - Current/Resistance....

Fri Aug 18 11:09:40 EDT 2017

Hi Renuka, 

In the following table you can find the voltage measured during the test performed on 8/04/17. 

Signal Name 	Readouts Voltage Taps [V] 	Temperature Estimated read [K] 
COIL1_T_EST 	VT6_DAQ = 1.345 	301.80 
COIL2_T_EST 	VT14_DAQ = 1.346 	302.46 
COIL3_T_EST 	VT8_DAQ = 2.180 	307.51 
COIL4_T_EST 	VT12_DAQ = 2.191 	307.76 
COIL5_T_EST 	VT10_DAQ = 4.266 	305.32 

Based on the voltage tap measure we can find the resistance values obtained prior to the cooldown. 
The current injected for the test was ~ 1 Amp. Test performed with external power supply (Icoil = 1 A), not dump resistor current (MPS) considered. 
Res_Coil 1 = VT6_DAQ / I coil = 1.345 ohms. 
Res_Coil 2 = VT14_DAQ / I coil = 1.346 ohms. 
Res_Coil 3 = VT8_DAQ / I coil = 2.180 ohms. 
Res_Coil 4 = VT12_DAQ / I coil = 2.191 ohms. 
Res_Coil 5 = VT10_DAQ / I coil = 4.266 ohms. 

Best Regards, 
Pablo 

From: "Renuka Rajput-Ghoshal" <renuka at jlab.org> 
To: "rfair" <rfair at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>, "Dave Kashy" <kashy at jlab.org>, "John Hogan" <hogan at jlab.org> 
Cc: "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "Glenn Young" <gyoung at jlab.org> 
Sent: Friday, August 18, 2017 10:46:27 AM 
Subject: Re: Estimated temperatures - Current/Resistance.... 

Hello All, 
Could you please give me the measures resistance value before the start of cool down? 

Thanks 
Renuka 

----- Original Message ----- 
From: "rfair" <rfair at jlab.org> 
To: "Dave Kashy" <kashy at jlab.org> 
Cc: "Probir Ghoshal" <ghoshal at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "John Hogan" <hogan at jlab.org>, "Glenn Young" <gyoung at jlab.org>, "Renuka Rajput-Ghoshal" <renuka at jlab.org> 
Sent: Thursday, August 17, 2017 9:03:02 PM 
Subject: Re: Estimated temperatures - Current/Resistance.... 

As we are measuring resistance for each coil and converting to temperature, does one set of VTs include a splice while the other does not? And if so, could this point to a 'defective' splice? 

We need to look at the VT diagram tomorrow and determine where the VTs are with respect to the splice? 

Probir can advise on what the 4 K difference equates to in terms of resistance and whether the magnitude of resistance could be indicative of a splice going 'bad'. 

I do not think there was significant difference in copper stabilizer between Coils 1 and 2 but we should check. 

Renuka 

Could you pull up the copper stabilizer dims that ETI measured for all the coils first thing tomorrow morning and pass the info to us? 

I should be back in the office by 11am 

Ruben 

> On Aug 17, 2017, at 8:06 PM, Dave Kashy <kashy at jlab.org> wrote: 
> 
> Hi Probir, 
> I see that Coils 3 and 4 are reading the same value ~289.5 
> Coil 5 is 298.2 
> All three believable. 
> 
> BUT, Coils 1 and 2 read different by ~4K (is this a sign of debonding?) I would expect they (1 and 2) are the same like Coil 3 and 4 match... 
> 
> Why could they be different? different stabilizer rolls with different dimensions? (John or Ruben or Glenn may have data...) 
> 
> Coil 1 285K 
> Coil 2 281K 
> 
> Nic, 
> Please add filtering to these 5 signals 
> 
> COIL1_T_EST 
> COILX_T_EST 
> 
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "Probir Ghoshal" <ghoshal at jlab.org> 
> To: "kashy" <kashy at jlab.org> 
> Cc: "Ruben Fair" <rfair at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
> Sent: Thursday, August 17, 2017 3:00:15 PM 
> Subject: Re: Solenoid and Torus Tasks 
> 
> Already back in place and reading..! 
> 
> Regards 
> 
> Probir 
> 
> ----- Original Message ----- 
> From: "Probir Ghoshal" <ghoshal at jlab.org> 
> To: "Dave Kashy" <kashy at jlab.org> 
> Cc: "Ruben Fair" <rfair at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
> Sent: Thursday, August 17, 2017 2:59:31 PM 
> Subject: Re: Solenoid and Torus Tasks 
> 
> No need to change the sign..! 
> But Agreed..! to the suggestion. 
> 
> Regards 
> 
> Probir 
> 
> 
> ----- Original Message ----- 
> From: "Dave Kashy" <kashy at jlab.org> 
> To: "Probir Ghoshal" <ghoshal at jlab.org> 
> Cc: "Ruben Fair" <rfair at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
> Sent: Thursday, August 17, 2017 2:18:04 PM 
> Subject: Re: Solenoid and Torus Tasks 
> 
> Should we change the sign? 
> I think if one knows the issue and the covers remain in position then one should be allowed to access the crows nest.... 
> 
> Dave 
> 
> Sent from my iPhone 
> 
>> On Aug 17, 2017, at 2:15 PM, Probir Ghoshal <ghoshal at jlab.org> wrote: 
>> 
>> The read of coil temp estimate will be off for about half an hour. 
>> Scot needed access to the SST. The PSU is been switched off. 
>> Will let you know once back. 
>> 
>> Regards 
>> 
>> Probir 
>> 
>> ----- Original Message ----- 
>> From: "Probir Ghoshal" <ghoshal at jlab.org> 
>> To: "Dave Kashy" <kashy at jlab.org> 
>> Cc: "Ruben Fair" <rfair at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
>> Sent: Thursday, August 17, 2017 1:16:10 PM 
>> Subject: Re: Solenoid and Torus Tasks 
>> 
>> All set now for comparision..! 
>> 
>> The equation required mods...! 
>> needs abs value and not -ve voltage..! 
>> Regards 
>> Probir 
>> ----- Original Message ----- 
>> From: "Dave Kashy" <kashy at jlab.org> 
>> To: "Probir Ghoshal" <ghoshal at jlab.org> 
>> Cc: "Ruben Fair" <rfair at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org> 
>> Sent: Thursday, August 17, 2017 11:52:22 AM 
>> Subject: Re: Solenoid and Torus Tasks 
>> 
>> Hi Probir, 
>> I can help you with epics screens. 
>> The calculated coil temps are -203 to -214K (as displayed). 
>> 
>> there must be some calculation errors... 
>> 
>> Dave 
>> 
>> 
>> ----- Original Message ----- 
>> From: "Probir Ghoshal" <ghoshal at jlab.org> 
>> To: "Ruben Fair" <rfair at jlab.org> 
>> Cc: "kashy" <kashy at jlab.org>, "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org> 
>> Sent: Thursday, August 17, 2017 8:11:42 AM 
>> Subject: Re: Solenoid and Torus Tasks 
>> 
>> Dear Ruben, 
>> 
>> I am in the hall now and after i have completed the polarity check will connect and mark the field direction on the solenoid with the benchtop PSU. 
>> Nick, Ruben - can either of you help me in getting the EPICS screen...I have a CCPR raised to fix my laptop and still not fixed..! 
>> 
>> regards 
>> 
>> Probir 
>> 
>> ----- Original Message ----- 
>> From: "Ruben Fair" <rfair at jlab.org> 
>> To: "Dave Kashy" <kashy at jlab.org> 
>> Cc: "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org> 
>> Sent: Thursday, August 17, 2017 7:48:58 AM 
>> Subject: Re: Solenoid and Torus Tasks 
>> 
>> Ok sounds good. 
>> 
>> Probir - will you be able to get the bench top PSU connected up today too? 
>> 
>> Ruben 
>> 
>> 
>> 
>> From: "David Kashy" <kashy at jlab.org> 
>> To: "Ruben Fair" <rfair at jlab.org> 
>> Cc: "Scot Spiegel" <spiegel at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org> 
>> Sent: Thursday, August 17, 2017 7:47:03 AM 
>> Subject: Re: Solenoid and Torus Tasks 
>> 
>> Item 2 flow controller is repaired and waiting on me. I don't want to do this yet as other things have priority. Probably early next week. 
>> 
>> Item 5: Also I'd like to get the low current flowing to check the DT between the coils and the ETI temperature sensors. 
>> 
>> Thanks 
>> Dave 
>> 
>> 
>> ----- Original Message ----- 
>> From: "Ruben Fair" <rfair at jlab.org> 
>> To: "Scot Spiegel" <spiegel at jlab.org> 
>> Cc: "kashy" <kashy at jlab.org>, "Denny Insley" <dinsley at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org> 
>> Sent: Thursday, August 17, 2017 7:31:32 AM 
>> Subject: Solenoid and Torus Tasks 
>> 
>> Hi Scot, 
>> 
>> How are you getting on with the following: 
>> 
>> 1. Torus - ice management system - replacement of mechanical relays with SSRs 
>> 
>> 2. Solenoid - flow controller repair and re-installation (?) 
>> 
>> 3. Solenoid - fitting socket head bolts to VCL voltage taps 
>> 
>> 4. Solenoid - Putting back front panel of isolation box on SST 
>> 
>> Regards 
>> 
>> Ruben 
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