CLONWiki - Recent changes [en]

SSH

Boiarino — Thu, 06 Aug 2026 21:41:34 GMT

RHEL9

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	update-crypto-policies --set LEGACY		update-crypto-policies --set LEGACY

	and then probably reboot, not sure.		and then probably reboot, not sure.

			'''NOTE:''' that worked on RHEL9.7. On RHEL9.8, in addition, have to add 2 lines to the end of ''/etc/ssh/ssh_config'':

			HostKeyAlgorithms +ssh-rsa
			PubkeyAcceptedAlgorithms +ssh-rsa

	== other issues ==		== other issues ==

JLAB VME TID

Boiarino — Fri, 31 Jul 2026 18:10:19 GMT

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	Clock distribution manual:		Clock distribution manual:
	[https://clonwiki0.jlab.org/wiki/clondocs/Docs/JLAB_VME_TriggerClock.pdf (pdf)] [https://clonwiki0.jlab.org/wiki/clondocs/Docs/JLAB_VME_TriggerClock.docx (docx)]		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/JLAB_VME_TriggerClock.pdf (pdf)] [https://clonwiki0.jlab.org/wiki/clondocs/Docs/JLAB_VME_TriggerClock.docx (docx)]


			'''NOTE:''' To switch to 125MHz, flip the SC1 switch (very bottom of the board) bit#3 and bit#5 to HIGH (up). (The numbers are marked on the switch, from right to left).

MPD

Boiarino — Wed, 29 Jul 2026 19:12:54 GMT

@@ Line 1: / Line 1: @@
-Useful commands to debug MPD/VTP readout problems:
+'''Things to try in case of problems:'''
   tcpClient gem1vtp vtpRocStatus - check 'Trigger Cnt' and 'Trigger Acks'
-MPD->SSP/VTP data format: [https://clonwiki0.jlab.org/wiki/clondocs/Docs/SSP_MPD_EventFormat_31_oct_2025.pdf (pdf)]
+'''MPD VTP firmware:'''

Streaming

Boiarino — Wed, 29 Jul 2026 14:39:27 GMT

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	Ben about 'no hits' debugging:		Ben about 'no hits' debugging:
	The vtpStats() function (I think that's what it's called) that shows MIG Writes and Read is a good indicator it's building hits - so that'll be a good thing to check if you aren't seeing hits in data to see if that shows anything (we can estimate the event builder hit rate on the VTP based on the number of MIG writes & reads per second). Let me know if you'd like me to try in debug something (particularly if you have it in a weird state: if you can leave it in that state I can try to login to check).		The vtpStats() function (I think that's what it's called) that shows MIG Writes and Read is a good indicator it's building hits - so that'll be a good
			thing to check if you aren't seeing hits in data to see if that shows anything (we can estimate the event builder hit rate on the VTP based on the number
			of MIG writes & reads per second). Let me know if you'd like me to try in debug something (particularly if you have it in a weird state: if you can leave
			it in that state I can try to login to check).

Linux Customization on CLON Cluster

Boiarino — Tue, 28 Jul 2026 17:34:00 GMT

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	* on daq servers, set [[ramdisk]] and disable swap by running ''swapoff -a'' and commenting out ''swap'' line in ''/etc/fstab''		* on daq servers, set [[ramdisk]] and disable swap by running ''swapoff -a'' and commenting out ''swap'' line in ''/etc/fstab''

			* on daq servers, install package for dynamically loading rol3's into coda_ebc:

			yum install patchelf

	* on daq servers, install TIpci card driver if needed, see [[JLAB PCI TI]]		* on daq servers, install TIpci card driver if needed, see [[JLAB PCI TI]]

Linux Installation Procedure

Boiarino — Tue, 28 Jul 2026 17:31:44 GMT

RHEL9 (64 bit) - machine under puppet control

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	Root password will be set by puppet during installation, as well as most other needed settings.		Root password will be set by puppet during installation, as well as most other needed settings.

	Install useful ~~pachages~~:		Install useful packages:
	yum install ncdu mysql gfortran		yum install ncdu mysql gfortran

Sampa

Boiarino — Mon, 27 Jul 2026 19:21:36 GMT

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	'''~~DAQ running instructions~~''' ~~can be found here:~~		'''Dream-based electronics info'''

	[https://clonwiki0.jlab.org/wiki/~~index~~.~~php/CLON_Standard_Procedures CLON Standard Procedures~~]		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/MVT_FEU_User_Manual.pdf FEU User Manual]

	~~'''Documentation'''~~:		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/CLAS12_MVT_Readout,pdf MVT Readout]

	[https://clonwiki0.jlab.org/wiki/clondocs/Docs/~~sampa_Sep2018~~.pdf ~~SAMPA V3 full manual~~]		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/MVT_Readout_Architecture.pdf MVT Readout Architecture]

	[https://clonwiki0.jlab.org/wiki/clondocs/Docs/~~Sampa_V5_DataSheet_final~~.pdf ~~SAMPA V5 Data Sheet~~]		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/MVT_Grounding.pdf MVT Grounding]

	[https://clonwiki0.jlab.org/wiki/clondocs/Docs/~~sampa_i2c~~.pdf ~~sampa/felix register access instructions from Takao Sakaguchi (Mar 11, 2022)~~]		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/HitachiCable_KZ12_262_Footprint.pdf MM<->FEU Hitachi Cable]

	~~''' CLAS12 Note in Overleaf'''~~

	~~Link for editing: https://www.overleaf.com/8293172751dbgzdpgzhpvx#31e19b~~		'''MVT vs Sampa Dynamic range, noise etc'''

	~~Link for viewing:~~ https://~~www~~.~~overleaf~~.~~com~~/~~read~~/~~ngbcwczybzdc#8187f4~~		[https://clonwiki0.jlab.org/wiki/clondocs/Docs/210427_MvtSampa.pdf MVT vs Sampa Dynamic range]

			[https://clonwiki0.jlab.org/wiki/clondocs/Docs/SNR.png Finding a working point]

	'''From Irakli (March 17, 2021)''':		'''From Irakli (March 17, 2021)''':
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	With increase of the noise level, the S/N ration will suffer, for sure, but may still remain fine, because on can increase detector gain.		With increase of the noise level, the S/N ration will suffer, for sure, but may still remain fine, because on can increase detector gain.
	(Attention though, high detector gain means high probability of ADC saturation).		(Attention though, high detector gain means high probability of ADC saturation).


			'''Sampa Documentation''':

			[https://clonwiki0.jlab.org/wiki/clondocs/Docs/sampa_Sep2018.pdf SAMPA V3 full manual]

			[https://clonwiki0.jlab.org/wiki/clondocs/Docs/Sampa_V5_DataSheet_final.pdf SAMPA V5 Data Sheet]

			[https://clonwiki0.jlab.org/wiki/clondocs/Docs/sampa_i2c.pdf sampa/felix register access instructions from Takao Sakaguchi (Mar 11, 2022)]






			''' CLAS12 Note in Overleaf'''

			Link for editing: https://www.overleaf.com/8293172751dbgzdpgzhpvx#31e19b

			Link for viewing: https://www.overleaf.com/read/ngbcwczybzdc#8187f4



			'''DAQ running instructions''' can be found here:

			[https://clonwiki0.jlab.org/wiki/index.php/CLON_Standard_Procedures CLON Standard Procedures]


	'''LV control''' (PL506 WIENER supply in EEL/125, 'mmtblv', 129.57.86.105)		'''LV control''' (PL506 WIENER supply in EEL/125, 'mmtblv', 129.57.86.105)