[Dsg-hallc_nps] NPS calorimeter PMT base amplifier

[Tyler Lemon]

Hi Simona,

After talking to you yesterday, I referred back to the MPOD technical manual to double check that the screen and PVs are reading what we expected.

The field that is set for a channel using the input box on the EPICS user interface screen is for the channel's current limit, not a current set point.

Is the current limit something that will should be on the EPICS screen?

If not, we'll remove it from the screen.

If it is still needed, we'll relabel and rearrange the screen to make clear that it's a current limit, not a set point.

-Tyler
________________________________
From: Fernando Barbosa <barbosa at jlab.org>
Sent: Monday, January 30, 2023 12:27 PM
To: Simona Malace <simona at jlab.org>
Cc: Chris Stanislav <stanisla at jlab.org>; Tyler Lemon <tlemon at jlab.org>; Fernando Barbosa <barbosa at jlab.org>
Subject: Re: NPS calorimeter PMT base amplifier

Hello Simone,

Correct. You just to set the voltages and current trip points. All the readbacks would be great.

Best regards,
Fernando

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________________________________
From: Simona Malace <simona at jlab.org>
Sent: Monday, January 30, 2023 11:31 AM
To: Fernando Barbosa <barbosa at jlab.org>
Cc: Chris Stanislav <stanisla at jlab.org>; Fernando Barbosa <barbosa at jlab.org>; Tyler Lemon <tlemon at jlab.org>
Subject: Re: NPS calorimeter PMT base amplifier

Hi Fernando,

Quick question: we set the amplifiers by voltage, right?
The attached picture shows the interface we will be using to operate the LV power supplies for the amplifiers.

If we set the amplifiers by voltage, there shouldn't be a field for set current, meaning the current drawn by the amplifier should not be expected as an input given by the user.

Is this correct?

For the current we just need readback fields (and probably trip points too).

Please advise.

Best Regards,

Simona

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________________________________
From: Fernando Barbosa <barbosa at jlab.org>
Sent: Friday, January 27, 2023 2:51:17 PM
To: Simona Malace <simona at jlab.org>
Cc: Chris Stanislav <stanisla at jlab.org>; Fernando Barbosa <barbosa at jlab.org>
Subject: RE: NPS calorimeter PMT base amplifier


Hello Simona,



That’s great.



I noticed that the LV parameters I provided earlier were not correct. The correct parameters are as follows:



The parameters for normal operation in the hall are:

  1.  LV: +3.5V and -3.5V @ 18 mA each.
  2.  HV: 605 V @405 uA. (tests in the EEL with cosmics can be set up to a maximum of 800 V).



The LV inputs have local voltage regulators that set the preamp voltages at +3 V and -3 V.



Best regards,

Fernando





From: Simona Malace <simona at jlab.org>
Sent: Friday, January 27, 2023 2:42 PM
To: Fernando Barbosa <barbosa at jlab.org>
Cc: Chris Stanislav <stanisla at jlab.org>; Fernando Barbosa <barbosa at jlab.org>
Subject: Re: NPS calorimeter PMT base amplifier



Hi Fernando,



Thank you.



I was planning to use my own portable dark box. I need to do some modifications to it so I can feed the amplifier LV ribbon cable.



I will be meeting with Chris on Monday at 10:30 and we will see then.



Thanks again



Simona



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________________________________

From: Fernando Barbosa <barbosa at jlab.org<mailto:barbosa at jlab.org>>
Sent: Friday, January 27, 2023, 1:58 PM
To: Simona Malace <simona at jlab.org<mailto:simona at jlab.org>>
Cc: Chris Stanislav <stanisla at jlab.org<mailto:stanisla at jlab.org>>; Fernando Barbosa <barbosa at jlab.org<mailto:barbosa at jlab.org>>
Subject: RE: NPS calorimeter PMT base amplifier



Hello Simona,



I am CCing Chris Stanislav as he tested all the dividers and can provide any additional guidance. He is in EEL 118.



The parameters for normal operation in the hall are:

  1.  LV: +3V and -3V @ 18 mA each.
  2.  HV: 605 V @405 uA. (tests in the EEL with cosmics can be set up to a maximum of 800 V).



The amplifier cannot be readily bypassed: this requires removing a couple of components and soldering a wire from the PMT input to the output connector. Chris may have one divider already configured in this way.



To use the laser in our dark box, you need laser training as the one we have is a Class 3B. However, Chris can set this up for you if you just take measurements on the scope and not access the dark box.



Best regards,

Fernando



From: Simona Malace <simona at jlab.org<mailto:simona at jlab.org>>
Sent: Friday, January 27, 2023 1:23 PM
To: Fernando Barbosa <barbosa at jlab.org<mailto:barbosa at jlab.org>>
Subject: NPS calorimeter PMT base amplifier



Hi Fernando,



I am getting ready to test the NPS calorimeter PMTs and I was wondering if you can send me sepcs for the base amplifier. I will first test one PMT in a dark box to exercise the HV and LV power supplies. I was also wondering if the amplifier can be by-passed (by not providing voltage to it) so I can get a feel for the PMT pulse un-amplified (it's not important for NPS, just for me out of curiosity).



Thank you.



Best Regards,



Simona


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