This doesn't seem to be one of the larger camps, listed in Prison camps in the Netherlands. Although especially Kamp Erica near Ommen might give you quite a glimpse of the conditions in general after the war in these camps.
In Haarlem, there was the much smaller, former garrison-turned-internment-camp: Koudenhorn (~Coldhorn).
This is found mentioned quite briefly in a report about mostly scandalous conditions in Dutch camps after the war:
In de „Koudehorn" te Haarlem konden bewakers zich af en toe vermaken (winter 1946) door de gevangenen beurtelings onder kokend en dan onder ijskoud water te plaatsen — een soort personeelscabaret.
__In the "Koudehorn" in Haarlem, guards could occasionally entertain themselves (winter 1946) by alternately placing the prisoners under boiling and then under ice-cold water –– a kind of personnel cabaret.
Hendrik Willem van der Vaart Smit: "Kamptoestanden 1944 45 48", N.V. Uitgeverij Keizerskroon - Haarlem, 1949. (Scan on archive.org)
The location seems to be listed in this Wikipedia stub as
Koudenhorn Kazerne, 52° 23′ 3″ NB, 4° 38′ 26″ OL (Kaart).
A slighty later picture to confirm?
That it was used for interrogating suspected political prisoners (Bewarings- en Verblijfkamp) after the war is confirmed here: Haarlem Koudenhornkazerne.